This document discusses the use of DNA microarrays in vulnerable plaque research. It provides background on atherosclerosis and identifies DNA microarrays as a tool that can be used to investigate the molecular mechanisms underlying plaque vulnerability. The document outlines the basic steps of a DNA microarray experiment and discusses considerations for experimental design, data analysis, and validation of results. It also summarizes several studies that have used DNA microarrays or related techniques to examine gene expression in atherosclerosis.
This document discusses the use of DNA microarrays in researching vulnerable plaque. DNA microarrays allow high-throughput analysis of gene expression and have opened doors to exploring unknown molecular mechanisms. The author's research group is conducting genomic and proteomic experiments on human atherosclerotic plaques to shed light on the molecular mechanisms involved in atherosclerosis development and vulnerability. Proteomic analysis provides insights not available through genomics alone. Understanding these molecular processes could lead to better understanding of vulnerable plaque development and complications.
This document summarizes the career and accomplishments of Dr. Narendra Malhotra, an Indian obstetrician and gynecologist. It lists his positions including professor, dean, editor of journals, and representative for several medical organizations. It also lists his awards, publications, guest lectures, and roles organizing conferences. The document then summarizes four prenatal cases where chromosomal microarray analysis (CMA) provided clinically relevant genetic findings beyond what standard tests like ultrasound, karyotyping, and FISH could detect. CMA identified deletions and duplications involving disease-associated genes that helped with counseling and clinical management. The last case highlights some of the challenges in interpreting CMA results prenatally.
This document discusses molecular genetic diagnosis techniques. It begins by describing how techniques like karyotyping, Southern blotting, and Sanger sequencing revolutionized genetic diagnosis in the late 20th century. It then covers the various indications for genetic testing, including inherited conditions, prenatal testing, and acquired conditions like cancer. The rest of the document details specific molecular analysis techniques used, such as PCR, Sanger sequencing, pyrosequencing, restriction fragment length analysis, FISH, MLPA, Southern blotting, and next generation sequencing. It provides examples of the medical applications of these various techniques.
This document discusses applications of Y chromosome short tandem repeat (STR) markers in forensic medicine. It provides information on the structure of the Y chromosome, commonly used Y STR markers and multiplex assays. Examples are given of how Y STR analysis was used to identify Saddam Hussein after his capture and to confirm paternal lineages in forensic investigations and ancestry research. The document also outlines the basic process of STR typing from sample collection to analysis and comparison of genetic profiles.
Comparative genomic hybridization is a molecular cytogenetic method for analysing copy number variations (CNVs) relative to ploidy level in the DNA of a test sample compared to a reference sample, without the need for culturing cells
DNA fingerprinting involves isolating DNA from a sample, cutting it into fragments using restriction enzymes, separating the fragments by size through gel electrophoresis, and comparing the unique band patterns to identify individuals. It has various forensic and medical uses such as identifying crime suspects by comparing DNA profiles, determining paternity in legal cases, and diagnosing inherited disorders. The chances of any two individuals having the exact same DNA profile are extremely low, making DNA fingerprinting a powerful tool for individual identification.
This document provides an overview of DNA microarrays, also known as DNA chips. It discusses the principles and techniques used to prepare DNA microarrays, including photolithography. There are two main types of DNA chips: cDNA-based chips and oligonucleotide-based chips. DNA microarrays have various applications, including gene expression profiling, drug discovery, and diagnostics. They provide the advantage of analyzing thousands of genes simultaneously but also have disadvantages such as high costs and complex data analysis.
Role of biomarkers and dna fingerprinting in herbal drug standardisationRoshni Ann
1. DNA contains the genetic instructions that determine an organism's characteristics. DNA is organized into genes located on chromosomes within cells.
2. The document discusses several techniques used for DNA fingerprinting, including microsatellites, restriction fragment length polymorphisms, amplified fragment length polymorphism, and random amplified polymorphic DNA.
3. DNA fingerprinting can be used to identify plant species and strains, helping to standardize herbal drugs and ensure quality. It has applications in forensics, ancestry tracing, and tracing the evolution of plants and microorganisms.
This document discusses the use of DNA microarrays in researching vulnerable plaque. DNA microarrays allow high-throughput analysis of gene expression and have opened doors to exploring unknown molecular mechanisms. The author's research group is conducting genomic and proteomic experiments on human atherosclerotic plaques to shed light on the molecular mechanisms involved in atherosclerosis development and vulnerability. Proteomic analysis provides insights not available through genomics alone. Understanding these molecular processes could lead to better understanding of vulnerable plaque development and complications.
This document summarizes the career and accomplishments of Dr. Narendra Malhotra, an Indian obstetrician and gynecologist. It lists his positions including professor, dean, editor of journals, and representative for several medical organizations. It also lists his awards, publications, guest lectures, and roles organizing conferences. The document then summarizes four prenatal cases where chromosomal microarray analysis (CMA) provided clinically relevant genetic findings beyond what standard tests like ultrasound, karyotyping, and FISH could detect. CMA identified deletions and duplications involving disease-associated genes that helped with counseling and clinical management. The last case highlights some of the challenges in interpreting CMA results prenatally.
This document discusses molecular genetic diagnosis techniques. It begins by describing how techniques like karyotyping, Southern blotting, and Sanger sequencing revolutionized genetic diagnosis in the late 20th century. It then covers the various indications for genetic testing, including inherited conditions, prenatal testing, and acquired conditions like cancer. The rest of the document details specific molecular analysis techniques used, such as PCR, Sanger sequencing, pyrosequencing, restriction fragment length analysis, FISH, MLPA, Southern blotting, and next generation sequencing. It provides examples of the medical applications of these various techniques.
This document discusses applications of Y chromosome short tandem repeat (STR) markers in forensic medicine. It provides information on the structure of the Y chromosome, commonly used Y STR markers and multiplex assays. Examples are given of how Y STR analysis was used to identify Saddam Hussein after his capture and to confirm paternal lineages in forensic investigations and ancestry research. The document also outlines the basic process of STR typing from sample collection to analysis and comparison of genetic profiles.
Comparative genomic hybridization is a molecular cytogenetic method for analysing copy number variations (CNVs) relative to ploidy level in the DNA of a test sample compared to a reference sample, without the need for culturing cells
DNA fingerprinting involves isolating DNA from a sample, cutting it into fragments using restriction enzymes, separating the fragments by size through gel electrophoresis, and comparing the unique band patterns to identify individuals. It has various forensic and medical uses such as identifying crime suspects by comparing DNA profiles, determining paternity in legal cases, and diagnosing inherited disorders. The chances of any two individuals having the exact same DNA profile are extremely low, making DNA fingerprinting a powerful tool for individual identification.
This document provides an overview of DNA microarrays, also known as DNA chips. It discusses the principles and techniques used to prepare DNA microarrays, including photolithography. There are two main types of DNA chips: cDNA-based chips and oligonucleotide-based chips. DNA microarrays have various applications, including gene expression profiling, drug discovery, and diagnostics. They provide the advantage of analyzing thousands of genes simultaneously but also have disadvantages such as high costs and complex data analysis.
Role of biomarkers and dna fingerprinting in herbal drug standardisationRoshni Ann
1. DNA contains the genetic instructions that determine an organism's characteristics. DNA is organized into genes located on chromosomes within cells.
2. The document discusses several techniques used for DNA fingerprinting, including microsatellites, restriction fragment length polymorphisms, amplified fragment length polymorphism, and random amplified polymorphic DNA.
3. DNA fingerprinting can be used to identify plant species and strains, helping to standardize herbal drugs and ensure quality. It has applications in forensics, ancestry tracing, and tracing the evolution of plants and microorganisms.
This document discusses DNA typing. It begins with an objective to discuss the history, definition, techniques, applications, advantages and disadvantages of DNA typing. It defines DNA typing as a procedure that analyzes DNA extracted from a biological sample to generate a DNA profile. It discusses techniques like RFLP, PCR, STR and mitochondrial DNA analysis. It covers applications in paternity disputes, identification and establishing biological relationships. Advantages include using small samples and applicability to old stains. Disadvantages include inability to differentiate identical twins and high costs.
Microsatellite are powerful DNA markers for quantifying genetic variations within & between populations of a species, also called as STR, SSR, VNTR. Tandemly repeated DNA sequences with the repeat/size of 1 – 6 bases repeated several times
Human identification from DNA is typically based
on 13 short-tandem repeat (STR) alleles. Commercial kits used in forensic casework rely on the detection of these alleles in DNA samples acquired from an individual. However, the process itself is slow (it can take up to 2 days when conducting a laboratory analysis or 1 hour when using Rapid DNA systems) and has been designed to operate on pristine DNA samples. The need for
achieving fast and accurate DNA processing has spurred efforts in developing portable systems that can reduce the processing time to less than 1 hour. But such systems are expected to operate on degraded DNA samples due to the architecture and process used by the instrument. Consequently, detecting the alleles in such degraded DNA samples can be a challenging problem. In this paper, we present an algorithm to detected allelic peaks from degraded DNA signals based on an adaptive signal processing scheme.
there are s many methods are used in diagnosis of human gene mutation which occur disorders ,here u get information about the diagnostic method for genetic mutation detection
This document provides information about microarray-based comparative genomic hybridisation (array CGH) testing. It discusses:
- What array CGH is and how it works to detect smaller chromosome imbalances than traditional testing methods.
- The potential benefits of an array CGH diagnosis, such as guiding monitoring and management of health issues, eligibility for support services, and relief of no longer needing multiple tests.
- Limitations, including that many genes' functions are unknown, so the implications of imbalances are unclear. A diagnosis may not change treatment but provides closure.
DNA microarrays, also known as DNA chips, are solid supports with DNA attached in an organized grid pattern. Each spot represents a single gene. Microarray technology allows screening of 1,00,000 genomic or cDNA sequences for presence in a single hybridization. RNA from healthy and cancer tissue samples are labeled with different colors, applied to a microarray, and analyzed to see which genes are expressed differently between healthy and cancer cells. DNA microarrays have many applications and provide large amounts of gene expression data quickly, but are expensive to create and results require complex analysis.
This document provides an overview of the history and current methods of forensic DNA analysis. It discusses early methods like RFLP that required large DNA samples, the development of PCR that allowed analysis of smaller samples, and the current standard method using STR analysis of 13-15 loci that can determine a person's profile with a probability of 1 in 1 trillion. It covers DNA mixture interpretation challenges, the CODIS database system, and specialized techniques like mtDNA, Y-STR, and SNP analysis.
DNA Fingerprinting of plants . History,procedure of DNA fingerprinting, PCR and NON PCR technique like RAPD,SSR,RELPs, application of DNA fingerprinting, advantage and disadvantage of DNA fingerprinting.
Next generation sequencing (NGS) can simultaneously detect aneuploidy and gene defects in single cells. It involves fragmenting DNA, sequencing short fragments, and using bioinformatics to map the fragments to the human genome. NGS can detect chromosome abnormalities and mutations with the same resolution as array comparative genomic hybridization. It also allows detection of mitochondrial DNA abnormalities and simultaneous analysis of aneuploidy and gene defects. In the future, whole gene sequencing may be possible. NGS is being used successfully for preimplantation genetic diagnosis and was used to produce the first baby born from NGS analysis.
TYPES OF MOLECULAR MARKERS,ITS ADVANTAGES AND DISADVANTAGESANFAS KT
Types of molecular markers (genetics)
ITS ADVANTAGES AND DISADVANTAGES
What is a genetic marker?
RFLP: Restriction fragment length polymorphism
AFLP: Amplified fragment length polymorphism
RAPD: Random amplification of polymorphic DNA
ISSR: Inter simple sequence repeat
STR: Short tandem repeats
SCAR: Sequence characterized amplified region
SNP: Single nucleotide polymorphism
SSR: Simple sequence repeat
Role of molecular marker play a significant supplementary role in enhancing yield along with conventional plant breeding methods. the result obtain through molecular method are more accurate and at genotypic level. It had wider applications in field of plant breeding, biotechnology, physiology, pathology, entamology, etc. The mapping information obtained from these markers had created a revolution in the sequencing sector and open many pathways for developments, innovations and research.
Diagnostic techniques for genetic disordersAhmed Sehrish
This document discusses diagnostic techniques for genetic disorders, including cytogenetic tests like fluorescence in situ hybridization (FISH) and karyotyping, as well as molecular tests like polymerase chain reaction (PCR), DNA microarray, DNA sequencing, and restriction fragment length polymorphism (RFLP). It provides examples of how each technique can be used to detect genetic abnormalities associated with diseases like cystic fibrosis, cancer, and HIV/AIDS. Real-time PCR is also described as a method for quantifying gene expression levels and monitoring viral load during HIV treatment.
Microarrays can be used for gene expression profiling, comparative genomics, disease diagnosis, drug discovery, and toxicological research. It allows researchers to examine thousands of genes simultaneously and see changes in gene expression patterns. Microarrays have applications in areas like cancer classification, pharmacogenomics, and toxicogenomics. While a powerful tool, microarrays also have limitations like being expensive to create and requiring time to develop.
The document discusses various types of mutations that can occur, including missense mutations, nonsense mutations, splice mutations, and frameshift mutations. It provides examples of wild-type and mutant DNA sequences to illustrate frameshift mutations. It also describes techniques used in mutational analysis like allele specific oligonucleotides (ASO), allele-specific real time polymerase chain reaction (PCR), and discusses genes involved in cancer signaling pathways such as EGFR, BRAF, KRAS, and their roles in the RAS/MAPK pathway.
Biotechnologists in forensic science analyze biological evidence found at crime scenes, such as DNA, to create genetic profiles for identifying individuals. They extract DNA from samples and analyze regions that vary between people, like STRs and VNTRs, to develop a unique DNA fingerprint for each person. Techniques used include PCR, RFLP, and analysis of mitochondrial DNA, Y chromosomes, and Alu repeats. DNA profiling has become an important tool for forensic investigations.
DNA contains genetic information that codes for proteins. It is found in the nucleus of cells in structures called chromosomes. DNA differs between individuals at certain locations called loci. Forensic DNA analysis involves extracting DNA from evidence samples, amplifying regions of interest using PCR, separating the amplified DNA, and comparing it to reference samples. If DNA matches between an evidence sample and suspect, statistics are presented on the estimated frequency of that DNA profile in a population. Mitochondrial DNA analysis can be used for degraded samples and examines DNA sequence rather than length.
1. Isolated-low HDL levels in ABCA1 heterozygotes is associated with impaired basal and stimulated endothelial nitric oxide synthase activity.
2. A single rapid infusion of reconstituted HDL completely restored both basal and stimulated endothelial nitric oxide synthase activity in ABCA1 heterozygotes.
3. Impaired lipid trafficking and caveolar disruption caused by dysfunctional ABCA1 profoundly affects endothelial nitric oxide synthase activity.
This document discusses a novel tracer for MRI imaging of macrophage infiltration in atherosclerotic plaque. It summarizes research into lipid-coated superparamagnetic iron oxide nanoparticles (SPIOs) that are phagocytosed by macrophages. The researchers tested various SPIO coatings and sizes to maximize macrophage uptake while minimizing oxidative stress. Lipid-coated SPIOs combined with certain aminoglycans showed the highest uptake and lowest induction of reactive oxygen species. The goal is to develop an MRI contrast agent that can noninvasively image vulnerable, inflamed plaques by detecting macrophage presence.
3rd vulnerable plaque rumberg 3 16-02 2SHAPE Society
Coronary artery calcium detected by electron beam tomography (EBT) establishes a diagnosis of coronary atherosclerosis, as there are no false positive calcium measurements. The amount of calcium seen on EBT correlates directly with the actual amount of coronary plaque measured by intravascular ultrasound and histopathology. Studies have also shown that a higher coronary artery calcium score on EBT is associated with greater risk of future myocardial infarction, sudden cardiac death, or ischemia over follow-up periods of 3-6 years.
This document summarizes major developments in understanding cardiovascular disease risk factors over three eras. Era 1 focused on traditional risk factors like cholesterol. Era 2 identified additional non-traditional factors. Era 3 explores novel inflammatory markers. While risk calculators only use Era 1 factors, studies increasingly show the significance of Era 2 and 3 markers. However, the 2002 AHA guideline was cautious to include these newer markers except ankle-brachial index, seeing need for more research. It also did not recognize non-lipid effects of statins or support controversial interventions without further trials.
183 postulated mechanisms of insulin resistanceSHAPE Society
This document discusses several potential mechanisms of insulin resistance including increased levels and activity of PTP-1B, impaired phosphorylation of the insulin receptor and IRS-1, reduced PI-3 kinase activity, and attenuated insulin signaling. This leads to reduced phosphorylation of ApoB or its chaperone, enhanced stability and accelerated assembly of ApoB, and overproduction of VLDL. The document also discusses the contribution of intestinal lipoproteins to metabolic dyslipidemia in insulin resistance, and a hypothesis that fasting and postprandial hyperlipidemia in insulin resistant states may be attributable in part to intestinal oversecretion of apoB-48 containing lipoproteins.
This document discusses in vivo coronary sinus thermography. It shows graphs of temperature differences over time between the coronary sinus and right atrium in controls and CAD patients, finding a significant difference. It lists ongoing research using thermography to study conditions like tachycardia, arrhythmias, medication effects, heart failure, and organ function. It concludes that new catheters are being developed to increase thermography sensitivity and that coronary sinus temperature may someday provide more patient information than just detecting plaque.
This document discusses DNA typing. It begins with an objective to discuss the history, definition, techniques, applications, advantages and disadvantages of DNA typing. It defines DNA typing as a procedure that analyzes DNA extracted from a biological sample to generate a DNA profile. It discusses techniques like RFLP, PCR, STR and mitochondrial DNA analysis. It covers applications in paternity disputes, identification and establishing biological relationships. Advantages include using small samples and applicability to old stains. Disadvantages include inability to differentiate identical twins and high costs.
Microsatellite are powerful DNA markers for quantifying genetic variations within & between populations of a species, also called as STR, SSR, VNTR. Tandemly repeated DNA sequences with the repeat/size of 1 – 6 bases repeated several times
Human identification from DNA is typically based
on 13 short-tandem repeat (STR) alleles. Commercial kits used in forensic casework rely on the detection of these alleles in DNA samples acquired from an individual. However, the process itself is slow (it can take up to 2 days when conducting a laboratory analysis or 1 hour when using Rapid DNA systems) and has been designed to operate on pristine DNA samples. The need for
achieving fast and accurate DNA processing has spurred efforts in developing portable systems that can reduce the processing time to less than 1 hour. But such systems are expected to operate on degraded DNA samples due to the architecture and process used by the instrument. Consequently, detecting the alleles in such degraded DNA samples can be a challenging problem. In this paper, we present an algorithm to detected allelic peaks from degraded DNA signals based on an adaptive signal processing scheme.
there are s many methods are used in diagnosis of human gene mutation which occur disorders ,here u get information about the diagnostic method for genetic mutation detection
This document provides information about microarray-based comparative genomic hybridisation (array CGH) testing. It discusses:
- What array CGH is and how it works to detect smaller chromosome imbalances than traditional testing methods.
- The potential benefits of an array CGH diagnosis, such as guiding monitoring and management of health issues, eligibility for support services, and relief of no longer needing multiple tests.
- Limitations, including that many genes' functions are unknown, so the implications of imbalances are unclear. A diagnosis may not change treatment but provides closure.
DNA microarrays, also known as DNA chips, are solid supports with DNA attached in an organized grid pattern. Each spot represents a single gene. Microarray technology allows screening of 1,00,000 genomic or cDNA sequences for presence in a single hybridization. RNA from healthy and cancer tissue samples are labeled with different colors, applied to a microarray, and analyzed to see which genes are expressed differently between healthy and cancer cells. DNA microarrays have many applications and provide large amounts of gene expression data quickly, but are expensive to create and results require complex analysis.
This document provides an overview of the history and current methods of forensic DNA analysis. It discusses early methods like RFLP that required large DNA samples, the development of PCR that allowed analysis of smaller samples, and the current standard method using STR analysis of 13-15 loci that can determine a person's profile with a probability of 1 in 1 trillion. It covers DNA mixture interpretation challenges, the CODIS database system, and specialized techniques like mtDNA, Y-STR, and SNP analysis.
DNA Fingerprinting of plants . History,procedure of DNA fingerprinting, PCR and NON PCR technique like RAPD,SSR,RELPs, application of DNA fingerprinting, advantage and disadvantage of DNA fingerprinting.
Next generation sequencing (NGS) can simultaneously detect aneuploidy and gene defects in single cells. It involves fragmenting DNA, sequencing short fragments, and using bioinformatics to map the fragments to the human genome. NGS can detect chromosome abnormalities and mutations with the same resolution as array comparative genomic hybridization. It also allows detection of mitochondrial DNA abnormalities and simultaneous analysis of aneuploidy and gene defects. In the future, whole gene sequencing may be possible. NGS is being used successfully for preimplantation genetic diagnosis and was used to produce the first baby born from NGS analysis.
TYPES OF MOLECULAR MARKERS,ITS ADVANTAGES AND DISADVANTAGESANFAS KT
Types of molecular markers (genetics)
ITS ADVANTAGES AND DISADVANTAGES
What is a genetic marker?
RFLP: Restriction fragment length polymorphism
AFLP: Amplified fragment length polymorphism
RAPD: Random amplification of polymorphic DNA
ISSR: Inter simple sequence repeat
STR: Short tandem repeats
SCAR: Sequence characterized amplified region
SNP: Single nucleotide polymorphism
SSR: Simple sequence repeat
Role of molecular marker play a significant supplementary role in enhancing yield along with conventional plant breeding methods. the result obtain through molecular method are more accurate and at genotypic level. It had wider applications in field of plant breeding, biotechnology, physiology, pathology, entamology, etc. The mapping information obtained from these markers had created a revolution in the sequencing sector and open many pathways for developments, innovations and research.
Diagnostic techniques for genetic disordersAhmed Sehrish
This document discusses diagnostic techniques for genetic disorders, including cytogenetic tests like fluorescence in situ hybridization (FISH) and karyotyping, as well as molecular tests like polymerase chain reaction (PCR), DNA microarray, DNA sequencing, and restriction fragment length polymorphism (RFLP). It provides examples of how each technique can be used to detect genetic abnormalities associated with diseases like cystic fibrosis, cancer, and HIV/AIDS. Real-time PCR is also described as a method for quantifying gene expression levels and monitoring viral load during HIV treatment.
Microarrays can be used for gene expression profiling, comparative genomics, disease diagnosis, drug discovery, and toxicological research. It allows researchers to examine thousands of genes simultaneously and see changes in gene expression patterns. Microarrays have applications in areas like cancer classification, pharmacogenomics, and toxicogenomics. While a powerful tool, microarrays also have limitations like being expensive to create and requiring time to develop.
The document discusses various types of mutations that can occur, including missense mutations, nonsense mutations, splice mutations, and frameshift mutations. It provides examples of wild-type and mutant DNA sequences to illustrate frameshift mutations. It also describes techniques used in mutational analysis like allele specific oligonucleotides (ASO), allele-specific real time polymerase chain reaction (PCR), and discusses genes involved in cancer signaling pathways such as EGFR, BRAF, KRAS, and their roles in the RAS/MAPK pathway.
Biotechnologists in forensic science analyze biological evidence found at crime scenes, such as DNA, to create genetic profiles for identifying individuals. They extract DNA from samples and analyze regions that vary between people, like STRs and VNTRs, to develop a unique DNA fingerprint for each person. Techniques used include PCR, RFLP, and analysis of mitochondrial DNA, Y chromosomes, and Alu repeats. DNA profiling has become an important tool for forensic investigations.
DNA contains genetic information that codes for proteins. It is found in the nucleus of cells in structures called chromosomes. DNA differs between individuals at certain locations called loci. Forensic DNA analysis involves extracting DNA from evidence samples, amplifying regions of interest using PCR, separating the amplified DNA, and comparing it to reference samples. If DNA matches between an evidence sample and suspect, statistics are presented on the estimated frequency of that DNA profile in a population. Mitochondrial DNA analysis can be used for degraded samples and examines DNA sequence rather than length.
1. Isolated-low HDL levels in ABCA1 heterozygotes is associated with impaired basal and stimulated endothelial nitric oxide synthase activity.
2. A single rapid infusion of reconstituted HDL completely restored both basal and stimulated endothelial nitric oxide synthase activity in ABCA1 heterozygotes.
3. Impaired lipid trafficking and caveolar disruption caused by dysfunctional ABCA1 profoundly affects endothelial nitric oxide synthase activity.
This document discusses a novel tracer for MRI imaging of macrophage infiltration in atherosclerotic plaque. It summarizes research into lipid-coated superparamagnetic iron oxide nanoparticles (SPIOs) that are phagocytosed by macrophages. The researchers tested various SPIO coatings and sizes to maximize macrophage uptake while minimizing oxidative stress. Lipid-coated SPIOs combined with certain aminoglycans showed the highest uptake and lowest induction of reactive oxygen species. The goal is to develop an MRI contrast agent that can noninvasively image vulnerable, inflamed plaques by detecting macrophage presence.
3rd vulnerable plaque rumberg 3 16-02 2SHAPE Society
Coronary artery calcium detected by electron beam tomography (EBT) establishes a diagnosis of coronary atherosclerosis, as there are no false positive calcium measurements. The amount of calcium seen on EBT correlates directly with the actual amount of coronary plaque measured by intravascular ultrasound and histopathology. Studies have also shown that a higher coronary artery calcium score on EBT is associated with greater risk of future myocardial infarction, sudden cardiac death, or ischemia over follow-up periods of 3-6 years.
This document summarizes major developments in understanding cardiovascular disease risk factors over three eras. Era 1 focused on traditional risk factors like cholesterol. Era 2 identified additional non-traditional factors. Era 3 explores novel inflammatory markers. While risk calculators only use Era 1 factors, studies increasingly show the significance of Era 2 and 3 markers. However, the 2002 AHA guideline was cautious to include these newer markers except ankle-brachial index, seeing need for more research. It also did not recognize non-lipid effects of statins or support controversial interventions without further trials.
183 postulated mechanisms of insulin resistanceSHAPE Society
This document discusses several potential mechanisms of insulin resistance including increased levels and activity of PTP-1B, impaired phosphorylation of the insulin receptor and IRS-1, reduced PI-3 kinase activity, and attenuated insulin signaling. This leads to reduced phosphorylation of ApoB or its chaperone, enhanced stability and accelerated assembly of ApoB, and overproduction of VLDL. The document also discusses the contribution of intestinal lipoproteins to metabolic dyslipidemia in insulin resistance, and a hypothesis that fasting and postprandial hyperlipidemia in insulin resistant states may be attributable in part to intestinal oversecretion of apoB-48 containing lipoproteins.
This document discusses in vivo coronary sinus thermography. It shows graphs of temperature differences over time between the coronary sinus and right atrium in controls and CAD patients, finding a significant difference. It lists ongoing research using thermography to study conditions like tachycardia, arrhythmias, medication effects, heart failure, and organ function. It concludes that new catheters are being developed to increase thermography sensitivity and that coronary sinus temperature may someday provide more patient information than just detecting plaque.
This document provides an overview of the new VP.org website and its goals of sharing research on vulnerable plaque (VP) to help eradicate heart attacks. Key features include an online library called Atheroline with medical literature and multimedia, a toolbar for easy access, and personalized alerts. The site aims to recycle scientific findings to build on past work and speed discovery. It also announces an upcoming VP symposium and lists new members joining the VP.org team. Long-term visions include widespread home screening tests for VP, over-the-counter treatments, and ultimately eliminating heart attacks.
This study examined plaque rupture in the brachiocephalic arteries of 98 fat-fed apolipoprotein E knockout mice over time. Ruptured plaques were significantly larger, more occlusive, had thinner fibrous caps, more previous ruptures, and a greater lipid burden than intact plaques. The earliest ruptures occurred after 7 weeks on a high-fat diet. A pravastatin treatment significantly reduced sudden deaths, suggesting statins may prevent plaque rupture.
3rd vulnerable plaque rumberger 3 16-02 1SHAPE Society
Electron beam tomography (EBT) is a scanning method introduced in 1984 that can rapidly image the heart using a scanning electron beam. EBT has been used in over 600 scientific papers to study cardiac imaging applications. One controversial application of EBT is its ability to determine and quantify coronary artery calcium. Coronary artery calcification is the hardening of the arteries that has been known for 300 years, but in the past 10 years it has been found to be an active process that can occur early in atherosclerotic plaque development and is an intimate part of the pathophysiology of coronary artery disease, regulated similarly to bone mineralization and repair. EBT images show calcification corresponds to areas of atherosclerotic plaque seen on histology
This document summarizes an editorial that discusses a study finding glycophorin-rich cores in pulmonary artery plaques from patients with chronic thromboembolic pulmonary hypertension. Glycophorins are proteins in erythrocyte membranes. The study suggests that thromboembolic material (erythrocyte membranes) may play a role in atheromatous core formation. While this is a novel hypothesis, extrapolating the findings to coronary atherosclerosis is challenging given differences in disease etiology and the lack of evidence examining glycophorin staining in coronary arteries. In conclusion, the editorial discusses that red blood cell membranes contain lipid-rich components that could contribute to atheroma formation, but more evidence is needed to substantiate this
204 prevalence of inflammatory cells in non ruptured atherosclerotic plaquesSHAPE Society
This document summarizes a post-mortem study examining the prevalence of inflammatory cells in non-ruptured atherosclerotic plaques. The study found that moderate or heavy staining for macrophages was present in 45% of femoral artery cross-sections and 84% of femoral arteries had at least one cross-section with moderate/heavy inflammation. There was no observed relationship between the degree of inflammation in the left and right coronary arteries within individuals, indicating the level of local inflammation is locally determined with little predictive value for other arteries.
A 71-year-old man with a history of diabetes, coronary artery disease status post myocardial infarction times three, and hypercholesterolemia was found to have an accidental left carotid stenosis and was scheduled for a left carotid endarterectomy. MRI of the carotid arteries was performed using SPIO contrast to better evaluate the extent of disease prior to surgery.
167 plaque p h heterogeneity in physiological mediaSHAPE Society
- The study measured pH, pCO2, and pO2 levels in human atherosclerotic plaque tissue over 4 hours using sensor wires placed in the plaque while submerged in oxygenated media.
- Sensor A, placed deeper in thicker plaque tissue, recorded lower pH and higher pCO2 levels compared to Sensor B, which was located closer to the vessel wall in thinner tissue.
- Strong correlations between pH and pCO2 for both sensors suggest the sensors were firmly placed in living plaque tissue. Physiologic readings that tracked changes in oxygen levels provide evidence that plaque remains in a living state when exposed to conditions resembling the in vivo environment.
The document describes results from experiments studying iron uptake and macrophage presence in the periaortic and pericoronary fat of mice, rabbits, and humans with atherosclerosis. Mice and rabbits genetically modified to be prone to atherosclerosis showed greater iron uptake and more macrophages in the periaortic fat compared to controls. In humans, macrophages were found not just in atherosclerotic plaques but also in the surrounding pericoronary fat tissue.
This document discusses a non-invasive technique using superparamagnetic iron oxide (SPIO) enhanced MRI to detect vulnerable plaque. SPIO particles are phagocytosed by macrophages and can thus be used to image inflammation. Studies in mice showed SPIO accumulation in atherosclerotic plaques after intravenous injection, indicating macrophage infiltration. MRI of abdominal aortas of mice after SPIO injection demonstrated higher signal in plaques compared to normal vessel walls, corresponding to greater iron uptake in inflamed plaques. This suggests SPIO enhanced MRI may non-invasively detect vulnerable plaque by imaging macrophage-mediated inflammation.
This document summarizes research on the effectiveness and cost-effectiveness of influenza vaccination, statin drugs, and aspirin for preventing cardiovascular events. It finds that influenza vaccination has been shown to reduce hospitalizations for cardiovascular disease by 6-12% and lower mortality by 48-50% based on observational studies. The cost per life saved from influenza vaccination is estimated to be $13,200, much lower than the $198,000 per life saved by statin drugs. While statins and aspirin are effective therapies, influenza vaccination provides benefits to cardiovascular health at the population level due to its low cost and ability to prevent thousands of events each year. More research is still needed to understand the mechanisms by which influenza increases cardiovascular risk
This document provides background on Jacques Barth, an expert in cardiovascular imaging and risk assessment. It discusses the evolution of ultrasound technology for measuring intima-media thickness (IMT) from 1986 to 2005. IMT is an early marker of atherosclerosis and cardiovascular risk. The document also addresses issues around vulnerable plaques, reporting IMT measurements, and assessing cardiovascular risk in children and adolescents.
This study investigated the role of hydrogen peroxide as an endogenous EDHF in coronary autoregulation of canine subepicardial microvessels in vivo. The researchers found that after NO inhibition, vasodilator responses were attenuated mainly in small arteries (>100 μm), whereas combined infusion of NO inhibition plus catalase abolished the autoregulatory vasodilation in both small arteries and arterioles (<100 μm). They concluded that hydrogen peroxide, an endogenous EDHF, plays an important role in coronary autoregulation of canine subepicardial microvessels in vivo.
117 mr images of human carotid arteriesSHAPE Society
Magnetic resonance (MR) images were taken of human carotid arteries from both a normal subject and a patient with carotid artery disease. The images show the carotid arteries of a healthy individual for comparison with those of a person suffering from carotid artery disease. The diseased arteries likely demonstrate abnormalities that indicate a restriction of blood flow.
134 mr contrast agents for vulnerable plaque imagingSHAPE Society
1. MS-325 is an albumin-targeted gadolinium contrast agent that highlights inflamed vessel walls and facilitates plaque imaging. It provides prolonged enhancement of the vessel wall and lumen, allowing for high resolution detection of plaque burden.
2. Studies show MS-325 provides strong enhancement of vessel walls adjacent to plaques due to increased capillary volume and binding to extravasated albumin in the vessel wall. This allows for detection and potential quantification of atherosclerotic plaques.
3. Experimental fibrin-targeted contrast agents EP-1242 and EP-1873 rapidly enhance arterial and venous blood clots in animal models, demonstrating potential for assessing thromboembolic risk and monitoring clot resolution with
This document discusses the use of DNA microarrays in studying vulnerable atherosclerotic plaques. It provides background on atherosclerosis and plaque rupture. DNA microarrays allow high-throughput analysis of gene and protein expression, which can provide insights into molecular mechanisms underlying plaque vulnerability. One study used microarrays to analyze gene expression differences between ruptured and stable plaques, identifying perilipin as upregulated in ruptured plaques. However, microarray analysis of atherosclerosis is still in its early stages with many technical challenges to address.
This document discusses the use of DNA microarrays in researching vulnerable plaque. DNA microarrays allow high-throughput analysis of gene expression and have opened doors to exploring unknown molecular mechanisms. The author's research group is conducting genomic and proteomic experiments on human atherosclerotic plaques to shed light on the molecular mechanisms involved in atherosclerosis development and vulnerability. They are examining differential gene and protein expression between ruptured and stable plaques using various techniques including laser capture microdissection. The goal is to gain a better understanding of the molecular processes leading to vulnerable plaques and their complications.
DNA microarrays allow for the high-throughput analysis of differential gene expression. They work by hybridizing fluorescently-labeled cDNA from experimental and control RNA samples to a large number of gene sequences spotted on a glass slide. After hybridization, scanned images are analyzed to determine differences in gene expression levels between the two samples. While a powerful tool, microarray results often require confirmation through low-throughput methods like quantitative RT-PCR due to the risk of false positives. Studies have used microarrays to identify genes involved in atherosclerosis, response to oxidized LDL, and effects of shear stress on endothelial cells.
DNA microarray technology allows for the high-throughput analysis of differential gene expression. The document discusses DNA microarray approaches, including spotted arrays and oligonucleotide chips. Key steps in a microarray experiment are described such as sample preparation, hybridization, and data analysis. Examples are given of microarray studies examining gene expression changes related to atherosclerosis, endothelial function, and macrophage response to oxidized LDL. Challenges in microarray design, analysis, and validation of results are also discussed.
DNA microarray is a technique that allows high-throughput analysis of gene expression. It involves depositing DNA fragments onto a glass slide and using fluorescent probes made from sample RNA to detect expression levels of thousands of genes simultaneously. The document discusses the basic principles and steps of DNA microarray, including sample preparation, hybridization, image analysis and data normalization. It also compares different microarray fabrication technologies and platforms, and discusses quality control considerations and limitations of the technique.
DNA microarray is a technique that allows high-throughput analysis of gene expression. It involves depositing DNA fragments onto a glass slide and using fluorescent probes made from sample RNA to detect expression levels of thousands of genes simultaneously. The document discusses the basic principles and steps of DNA microarray, including sample preparation, hybridization, imaging, and data analysis. It also compares different microarray fabrication technologies and highlights some challenges in the field, such as lack of standardization and high rates of false positives.
The document discusses various applications and techniques of DNA microarrays, including summarizing key points about Affymetrix GeneChips, spotted microarrays, experimental design, data analysis, and several case studies on various topics like ovarian cancer, Sjogren's syndrome, wine yeast genomics, and norovirus genotyping. Microarrays allow analysis of gene expression patterns and copy number variations across genomes through comparative hybridization experiments. The document provides an overview of microarray technology and applications in genomic and biomedical research.
Dr. Shamalamma S. presented on DNA microarrays. DNA microarrays allow thousands of genes to be compared simultaneously by attaching DNA probes to a chip which fluorescently labeled samples can bind to. The chip is then scanned to analyze gene expression levels. Applications include disease diagnosis, toxicology studies, and pharmacogenomics. While a powerful tool, microarrays have limitations such as lack of knowledge about many genes and lack of standardization.
Microarrays allow researchers to examine gene expression patterns across thousands of genes simultaneously. A microarray contains probes for known genes that are used to detect complementary mRNA in a biological sample. Microarrays can be used to study gene expression differences between normal and diseased tissues, classify tumor subtypes, and diagnose cancers. They also show promise for personalized cancer treatment by predicting patient prognosis and response to therapy.
This document discusses high-resolution views of the cancer genome using various technologies including DNA microarrays, comparative genomic hybridization, tiling arrays, next-generation sequencing, and DNAse-Seq. It describes how these technologies can be used to analyze gene expression, copy number variation, chromatin structure, and more to better understand cancer at the genomic level. Integrating data from all these sources presents challenges but may help improve individual health outcomes.
Gene Expression - Microarrays discusses analyzing gene expression data from microarray experiments. It describes the basic workflow including experimental design, sample preparation, hybridization, image analysis, preprocessing, normalization, and statistical analysis. Key points are that microarrays allow measuring expression of thousands of genes simultaneously, and proper experimental design and data analysis are important to draw meaningful biological conclusions from microarray data.
This document discusses genomic technologies that can be used to observe the human genome and their applications. It covers microarrays, next-generation sequencing, DNA methylation, copy number variation, and more. Challenges include the cost of these technologies and integrating the large amounts of data they produce to improve healthcare.
Molecular techniques for pathology research - MDX .pdfsabyabby
This document discusses molecular techniques used in pathology research such as PCR, microarrays, next generation sequencing, immunohistochemistry, ELISA, and Western blotting. It provides details on each technique including the basic principles, applications in research, and examples of uses in studies of gene expression, cancer, bone disease, and growth retardation. The learning outcomes are to understand these techniques and their uses in basic and clinical research.
1. The study aims to identify genomic and proteomic risk and protective factors for coronary heart disease by analyzing gene and protein expression profiles in blood cells from patients with and without heart disease and associated risk factors.
2. Blood samples will be collected from five patient groups and mRNA will be isolated from monocytes and neutrophils for analysis using DNA microarrays and suppression subtractive hybridization.
3. Differentially expressed genes will be confirmed with real-time PCR and protein expression analyzed using in situ hybridization and immunochemistry to help identify new diagnostic and therapeutic targets for coronary heart disease.
508 search for genomic and proteomic risk factors and protective factors asso...SHAPE Society
1. This study aims to identify genomic and proteomic risk factors and protective factors associated with coronary heart disease by analyzing gene and protein expression profiles in blood cells from patients with and without heart disease.
2. The study will recruit patients aged 18-80 categorized into five groups based on having heart disease and traditional risk factors. Gene expression in monocytes and neutrophils will be analyzed using microarray technology and real-time PCR.
3. Differentially expressed genes will be identified by comparing expression profiles between patient groups to uncover new diagnostic markers and therapeutic targets for coronary heart disease.
The document describes an analysis of gene expression data from a glioblastoma cell line before and after treatment with the chemotherapeutic drug temozolomide (TMZ). RNA sequencing data was analyzed using the Deseq2 model to identify differentially expressed genes between untreated and treated conditions. Weighted gene co-expression network analysis (WGCNA) was also used to cluster genes into modules and identify co-expression patterns. Additionally, a software application was developed to analyze single-cell RT-PCR data on 96 genes of interest identified from the RNA-seq analysis, in order to investigate tumor heterogeneity. The results highlighted genes and gene modules related to drug resistance in glioblastoma.
Clinical molecular diagnostics for drug guidanceNikesh Shah
1. Be familiar with next generation molecular diagnostic techniques that can provide guidance in clinical decision making
2. Identify the utility of these diagnostic approaches with some examples
3. Be aware of the challenges that exist in implementing these tools as part of the routine clinical decision making process, especially in resource limited settings
A DNA microarray (also commonly known as DNA chip or biochip) is a collection of microscopic DNA spots attached to a solid surface.
The core principle behind microarrays is hybridization between two DNA strands, the property of complementary nucleic acid sequences to specifically pair with each other by forming hydrogen bonds between complementary nucleotide base pairs.
The document discusses DNA and its use in species identification and forensics. It notes there are estimated to be 8.7 million species on Earth. DNA contains the genetic code and instructions for making proteins. DNA profiling uses restriction enzymes to cut DNA into fragments that can then be compared to identify individuals. Advances allow DNA to be extracted from smaller samples and new sources. DNA evidence has limitations but continues to be a powerful forensic tool when handled properly.
DNA microarrays, also known as DNA chips or biochips, allow researchers to measure gene expression levels or genotype multiple genomic regions simultaneously. They work by hybridizing sample DNA to probes attached to a solid surface based on complementary base pairing. Researchers can now run thousands of samples at once under identical conditions using microarray technology. It has accelerated genetic research by enabling many tests to be done in parallel. Microarray data analysis involves image analysis, data processing, and statistical classification methods to organize and interpret the large datasets generated.
Similar to Acc 2002 microarray mehran for print (20)
This document outlines an approach to identifying and managing coronary risk. It recommends that prevention must be the primary goal through intensive global risk factor reduction for all patients with clinically apparent heart disease. It also recommends identifying asymptomatic high-risk individuals through testing like the Framingham Risk Score so they can receive prevention. It proposes a risk stratification approach from low to very high risk based on annual risk levels and corresponding testing and treatments, with very high risk patients receiving the most intensive treatments like invasive detection of unstable plaques and procedures like CABG or multiple drug-eluting stents.
This document describes a study that uses intravascular ultrasound (IVUS), biplane coronary angiography, and blood flow measurements to characterize endothelial shear stress (ESS) in coronary arteries. It found that over 6 months, areas of low ESS demonstrated plaque progression, areas of normal ESS remained stable, and areas of high ESS developed outward remodeling. The technology allows in vivo determination of intracoronary flow velocity and ESS, which has not previously been possible. This provides a method to predict progression of atherosclerosis and vascular remodeling. A pilot study applied this technique in 8 patients at baseline and 6 months to analyze changes in native coronary artery disease and in-stent restenosis while taking candesartan vs fel
Zahi A. Fayad is an Associate Professor who studies molecular imaging of atherosclerosis using MRI. His research focuses on developing targeted contrast agents to noninvasively detect unstable plaque. Some agents under investigation include annexin A5 labeled with a radioisotope to detect apoptosis, FDG-PET to assess plaque activity, and fibrin-targeted and MMP-targeting Gd-based contrasts. Additional work involves lipid-based particulate agents using reconstituted HDL or iron oxide nanoparticles. The goal is to improve MRI detection sensitivity and specificity for high-risk plaque characterization.
This document discusses the use of coronary CT angiography (CTA) to detect and characterize coronary atherosclerosis beyond just detecting coronary stenoses. CTA can identify calcified plaques, non-calcified plaques, mixed plaques, atheromas, thrombi, and myocardial infarction scars. CTA provides information on plaque composition and distribution that can help understand coronary artery disease and be used to follow patients under therapy. The limitations of CTA include artifacts from cardiac motion, breathing, blooming effect, and poor contrast opacification of small vessels. Advances in multislice CT technology are helping to address some of these limitations.
This document discusses approaches to cardiovascular disease (CVD) and the need for new approaches. It summarizes that the emphasis is shifting from high risk plaques to high risk symptomatic patients, and from high risk asymptomatic to intermediate and low risk patients. It discusses diagnostic tools like magnetic resonance imaging to identify high risk asymptomatic patients and computed tomography to identify intermediate risk patients using coronary artery calcium scoring and CRP biomarkers. It also discusses prevention and treatment strategies like a polypill for acute coronary syndrome patients and those with chronic atherothrombosis.
This document proposes a non-invasive method using SPIO (super paramagnetic iron oxide) nanoparticles to image macrophage infiltration and inflammation in vulnerable atherosclerotic plaques. Rabbits and mice were injected with SPIO, which accumulated in inflamed plaque areas correlated with macrophage density. SPIO-enhanced MRI then successfully identified these inflamed plaques non-invasively in vivo. This technique could provide a way to detect rupture-prone plaques and better understand plaque vulnerability.
This document discusses the use of coronary CT angiography (CTA) to detect and characterize coronary atherosclerosis beyond just detecting coronary stenoses. CTA can identify calcified plaques, non-calcified plaques, and mixed plaques. It can detect atheromas and characterize plaque density. CTA can also identify intracoronary thrombi and myocardial infarction scars. The document outlines the CTA scanning parameters and techniques used to minimize motion artifacts and optimize image quality for plaque detection and characterization.
This document describes a study that introduces a non-invasive method for imaging macrophage infiltration in inflamed atherosclerotic plaques using superparamagnetic iron oxide (SPIO) nanoparticles and MRI. The researchers injected SPIO into hypercholesterolemic and normal rabbits and found that SPIO profoundly accumulated in areas of macrophage infiltration in the atherosclerotic plaques, as confirmed by histology. SPIO-enhanced MRI was able to identify these inflamed plaques non-invasively. The results suggest SPIO-enhanced MRI can be a novel method for detecting rupture-prone inflamed plaques associated with heart attacks and strokes.
The document discusses several factors that are considered predictors of plaque vulnerability, including luminal narrowing, plaque volume and composition, fibrous cap thickness, and plaque inflammation. It reviews studies that show myocardial infarction can develop from previously non-severe lesions and that lipid content, cap thickness, inflammation, and stress factors like circumferential stress are correlated with plaque stability and vulnerability. In conclusion, the size and composition of the lipid core, thickness and composition of the fibrous cap, and inflammation are well-established predictors of plaque rupture.
The document provides details about AEHA's booth at the ACC/AEHA Exhibition from March 30 to April 1, 2003. It lists the booth equipment and inventory, proposed activities like an Ecode on Friday morning and a VP Symposium. Giveaways include Magellan GPS devices in a raffle and Dove chocolates. It also discusses the need for an immediate membership sign-up page on the AEHA website and a vision for the future of AEHA.
This document discusses approaches to identifying and managing coronary risk. It states that the primary goal should be preventing acute cardiac events through intensive risk factor reduction for all patients with clinically apparent heart disease. Additionally, it notes that one third of sudden cardiac deaths and heart attacks occur in previously asymptomatic individuals with undiagnosed risk factors or pre-clinical disease. The document proposes identifying high-risk asymptomatic individuals through testing to provide prevention. It presents a risk stratification approach using testing like CRP, cholesterol, glucose and imaging to guide different levels of risk factor reduction and management.
Vulnerable plaques are prone to rupture and cause heart attacks. This document proposes criteria for defining vulnerable plaques based on histopathology and clinical factors. It also explores using infrared thermography to identify vulnerable plaques by detecting heat from macrophage inflammation. Studies in animal models and humans found temperature heterogeneity in atherosclerotic arteries that correlated with plaque vulnerability features. Further research aims to develop non-invasive thermography techniques to accurately detect vulnerable plaques and help predict heart attack risk.
The document presents findings on the A20 gene, which encodes a zinc finger protein that inhibits NF-kB activity and TNF-induced apoptosis. The study found that C57 and FVB mouse strains have a coding difference in A20 that generates a phosphorylation site in C57 mice. C57-A20 was less effective at shutting down TNF-induced NF-kB activity and C57 cells were less susceptible to TNF-induced apoptosis compared to FVB cells. This suggests less active A20 in C57 mice leads to increased inflammation and reduced apoptosis, while more active A20 in FVB mice decreases inflammation and increases apoptosis, contributing to differences in atherosclerosis susceptibility between the strains.
#1 killer of human beings in the 21st centurySHAPE Society
Vulnerable plaque refers to dangerous forms of atherosclerotic plaques that can rupture or induce thrombosis, disrupting blood flow. The document discusses the history and research around vulnerable plaque, including pioneers in the field and emerging techniques to detect vulnerable plaque such as intravascular ultrasound, optical coherence tomography, and magnetic resonance imaging. It summarizes that vulnerable plaques are typically characterized by a thin fibrous cap, large lipid core, and presence of macrophages.
The document presents findings on the A20 gene, which encodes a zinc finger protein that inhibits NF-kB activity and TNF-induced apoptosis. The study found that C57 and FVB mouse strains have a coding difference in A20 that generates a putative phosphorylation site in C57 mice. Experiments showed the C57 version of A20 is less effective at shutting down NF-kB activity and C57 cells are less susceptible to TNF-induced apoptosis. This suggests the A20 variation could contribute to differences in atherosclerosis susceptibility between C57 and FVB strains by affecting inflammation and apoptosis.
This progress report discusses ongoing near-infrared (NIR) spectroscopy studies. It notes that a new probe design is being developed to improve signal detection in the NIR range. Characterization of a new light source and additional tissue phantom studies are needed. The report identifies ongoing difficulties with depth penetration studies and experimental setup issues. Priorities include analyzing existing data to inform probe redesign, characterizing the new light source, conducting depth penetration and tissue phantom studies, and addressing experimental setup challenges.
This document discusses the use of C-reactive protein (CRP) and low-density lipoprotein (LDL) cholesterol levels to predict cardiovascular risk. It summarizes a study that found CRP to be a stronger predictor of future cardiovascular events than LDL. The study measured CRP and LDL levels in 27,939 healthy women and followed them for 8 years, finding that most cardiovascular events occurred in women with normal or low LDL (<160 mg/dl) but elevated CRP. The document concludes that combining CRP and LDL measurements provides better risk assessment than either marker alone.
This study investigated genetic differences in vascular remodeling and shear stress regulation in response to altered blood flow in four inbred rat strains. The results showed significant differences among strains in their ability to maintain normal endothelial shear stress levels through outward arterial remodeling when flow was increased or decreased. Specifically, the GH strain was better able to regulate shear stress through remodeling compared to the SHR-SP strain. These genetic differences in vascular responses to changes in blood flow have important implications for understanding the variable manifestations of atherosclerosis and susceptibility to cardiovascular disease in individuals and populations. Future studies are needed to investigate whether similar genetic differences exist in humans and their role in clinical outcomes.
This document contains fluorescence intensity measurements from a fluorescence-based assay using different concentrations of FITC-labeled superparamagnetic iron oxide nanoparticles (FITC SPIO). The measurements are organized in a table with concentrations of FITC SPIO along the left and average fluorescence units per well and standard deviations for different samples labeled with letters in the cells.
The document discusses the role of lipoproteins, particularly LDL and HDL, in inflammation and atherosclerosis. LDL readily enters the artery wall where it can become modified, making it proinflammatory. Modified LDL stimulates expression of MCP-1, which recruits monocytes. Modified LDL also promotes differentiation of monocytes into macrophages. In contrast, HDL is potentially anti-inflammatory. Atherosclerosis is characterized as an inflammatory disease where lipoproteins influence multiple aspects of inflammation.
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
- Video recording of this lecture in English language: https://youtu.be/kqbnxVAZs-0
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- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
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Osteoporosis - Definition , Evaluation and Management .pdfJim Jacob Roy
Osteoporosis is an increasing cause of morbidity among the elderly.
In this document , a brief outline of osteoporosis is given , including the risk factors of osteoporosis fractures , the indications for testing bone mineral density and the management of osteoporosis
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share - Lions, tigers, AI and health misinformation, oh my!.pptxTina Purnat
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2. Atherosclerosis and the resulting coronary heart disease represent the most
common cause of death in industrialized nations.
Although certain key risk factors have been identified, the molecular mechanism
responsible for this complex disease and its deadly complications remains as a
challenge in the years to come.
Rupture of atherosclerotic plaque is the predominant underlying process in the
pathogenesis of acute coronary syndromes.
Although we have gained a great deal of knowledge on underlying pathology
involved in plaque vulnerability to rupture, the exact molecular mechanisms
underlying the process is still largely unexplored.
3. Evolution of genomic and proteomic techniques has opened the door to the
world of unknown molecular mechanisms in the body that allowing
thorough investigation into susceptibility of certain people / patients to
certain outcomes
Investigation of advanced atherosclerosis using the tools for systematic gene and
protein expression analysis is a surprisingly neglected area of study and has not
been touched widely enough. Only a few numbers of investigators worldwide are
actively pursuing this field. (B.C.G Faber, J.A.P Deamen; L.D Adams, Stephen
M.Schwartz; M.P. Herman, Uwe Schonbeck; k.J.Haley, Richard T Lee; Timothy
A.McCaffrey;L.W.Stanton, R Tyler White;D.Shiffman, Richard M Lawn;Brian K
Coombes, )
Deamen Schwartz Lee
4. During the last half of the 20th
century, the analysis of the regulation and function
of genes largely Been driven by step-by-step studies of individual genes and proteins.
In the past decade, a paradigm shift has emerged in which
we are now able to produce large amounts of data about many
genes in a highly parallel and rapidly serialized manner.
An important tool in this process has been
the development of DNA microarray
5. Low-throughput methods of gene expression
Northern Blotting, cumbersome, time-consuming
Nuclease protection, at least 10 fold more sensitive
Quantitative RT-PCR, state of the art
High-throughput Methods of gene expression
Serial Analysis of Gene Expression (SAGE)
Rapid Analysis of Gene Expression (RAGE)
Representational Difference Analysis (RDA)
Suppression Subtractive Hybridization (SSH)
Differential screening (plus/minus screening)
Differential Display (DD)
DNA Microarray =400,000 Northern Blotting
6. What is DNA Microarray?
A large number of genes deposited onto a glass slide (large scale dot blot)
The RNA sample is RT with simultaneous incorporation of label,
resulting in labeled cDNA.
Microarray slides serve as hybridization targets for labeled cDNA
Reverse Northern blotting
Patrick O Brown
Mark Schena
7. Basic Steps in Performing a DNA Microarray Experiments
1- Processing cDNA clones to generate print-ready material
2-Printing cDNA clones (or oligonucleotide) onto a substrate
3-Sample RNA isolation
4-Preparation of the probe (e.g. cDNA synthesis and labeling, RT reaction)
5- Hybridization of labeled probe DNA to the DNA arrayed on the substrate
6-Image acquisition, image analysis and data analysis
8. Microarray Fabrication Technologies
In Situ Synthesis of Nucleic Acid (Chip ,GeneChip,oligonucleotide array)
15-20 different 25-mer oligonucleotides
Exogenous Deposition of cDNA (cDNA, spotted array)
Single DNA fragments, greater 0.5 Kb
9. Analysis of Gene Expression
Monitoring Changes in Genomic
DNA
Gene Discovery, Sequencing and Pathway Analysis
When to use Microarray
10. Analysis of Gene Expression
1- Different tissues or different developmental states
2- Normal or diseased states
3- Exposure to drugs or different physiological conditions
11. Two basic substrates commonly used for cDNA printing
are glass and membrane filters
Chemically treated microscope glass slides are the most
widely used support
Microarray, Microscope Slide,80000 Spots,
Macroarray, Nylon Membrane, 500,-18000 Spots
Micro or Macro
12. RNA Preparation
No difference between total RNA or mRNA
Type of tissue might have profound effect on extraction
process. 10 -20 µg of RNA is needed/slide
Laser captured microdissection (LCM) , incorporation of a
PCR step( access to subpopulations cells in vulnerable plaque)
13. Sample Labeling
Most microarray utilize two fluorophores,
Cyanine3(Green emission) and Cyanine5 (Red emission)
Fluorophores have different size and different ability
for incorporation in cDNA
A single round of transcription is used to generate
a labeled cDNA probe (RT-PCR)
14. Affymetrix Genechip
Biotinylated cRNA is synthesized from cDNA
phycoerthrin linked to avidin is used for labeling
Each sample hybridized separately
Advantages
High density chip
Consistent and uniform geometry
Single Nucleotide Polymorphisms(SNP)
No need for maintaining cDNA clones
Disadvantages
Sequence data required
Oligonucleotid selection rules
are not well defined
Not best target for hybridization
Expensive
Hybridization to oligonucleotide is sensitive in
detection of single-nucleotide mismatches
15. No consensus on Data Analysis( ANOVA), Clustering
(categorizing genes according to their pattern of expression)
Normalization
First step is during scanning, when sensitivity of
detection is adjusted by the laser voltage
Gene expression value can be expressed relative
to the expression of housekeeping genes
In the absence of control genes, normalization to the median
microarray value is popular
16. Analyzed gene changes are often expressed as a fold increase
either greater than twofold or less than 0.5 fold (DeRisi)
How Much is Significant???
With a large number of microarrays, small changes can be statistically valid
Elcock et al. detected 1.1 fold changes with 95 % confidence interval when
each experimental sample was hybridized to
seven microarray slides (with two replicate spots for each gene)
Derisi et al.Nat Genet 1996:14:457-60
17. Housekeeping genes
These are genes that are expressed constitutively and their level of
expression is thought to be stable, regardless of the sample used (β
Actin, Cyclophilin, GAPDH)
DeRisi used 90 housekeeping genes and found that changes that
were <0.5 and > 2.4 were acceptable
β Actin is one of the most commonly used housekeeping genes
and it has been shown to be downregulated in heat shock experiments
In fact, there is an appreciable amount of literature available to
suggest that there is no such thing as housekeeping gene
18. DNA microarray represents a developing technology, there remain
substantial obstacles in the design and analysis of these microarray
There are no globally accepted rules or standards
for performing controlled microarray experiments
A good experiments include more control component then
the real comparison
Accuracy and Precision
19. Principles of Q.C in DNA Microarray
Replication of each experiments on multiple array
Dual labeling, swapping the dyes for control and treated sample
Using a large number of controls on every array
Rajeevan et al. estimated that 30% of
microarray results are false-positive
Microarray findings should be confirmed, at least
by one of the low-throughput gene expression methods
Down-Scaling of an experiment makes it generally
sensitive to external and internal fluctuation
J.Mol.Diag 2001,3:26-31
20. Controls
mRNA from genes that are not homologous to the organism understudy (Arabidopsis)
cDNA from the organism with high, medium and
low expression represented on the array (sensitivity)
Cold DNA (e.g., calf thymus DNA, yeast tRNA)
is added to block nonspecific annealing
Spots of DNA from another organism whose
mRNA is not represented in the sample (Background)
Total genomic DNA or cDNA clones of common contaminant such
as E.Coli and yeast are represented in the array to monitor for contamination
21. The number of genes encoded by the Human genome has been
estimated ∼ 32,000 - 38,000.
Between 21,000 - 27,000 genes are expressed in the cardiovascular system
Lack of information
No cDNA Library for Atherosclerotic plaques
Only 5% of total ESTs deposited in GeneBank derived from cardiovascular tissue
ESTs from cardiovascular tissues or cell type
or from diseased specimens remain limited
22. Cardiovascular EST data from most model organisms are almost nonexistent
The construction of cardiovascular gene databases at different
stages of pathology cast light on the complex genetic
mechanisms underlying disease of cardiovascular system
DNA microarray technology is in infancy
DNA microarray in atherosclerosis was not
born or at least is premature
Premature
23. The first study dealing with differential gene expression in whole-mount
specimens of rupture plaques using macroarray
Suppression Subtractive Hybridization (SSH) technique isolates low abundant
sequence that might not be isolated by use of microarray technology
Mammalian mRNA population
20% Abundant transcript (1000-12000 copies/cell)
25% Medium abundant (100-1000 copies/cell)
% 50 small number copies (< 13 copies/cell)
Mammalian mRNA encoding proteins that regular cellular
behavior are expressed at low abundance
Identification of Gene Potentially Involved in Rupture of
Human Atherosclerosis Plaques
Circ Res 2001;89;547554
Deamen
24. Perilipin was the known gene that up regulated (confirmed by RT-PCR) , 8 of 10
ruptured plaques expressed perilipin while expression was absent in 10 stable plaque
Perilipin is a protein which present on the surface layer of
intracellular lipid droplets in adipocyte and prevent lipolysis
They speculated that the increase in perilipin result in increased lipid
retention and plaque destabilization
β actin was down regulated in ruptured plaques
The down regulation of one gene was not confirmed by RT-PCR
A pool of 3 ruptured plaques was compared with a
a pool of advanced but stable plaques
25. Prelipin is unlikely to be the sole marker of rupture
The author used only 10% of differentially expressed gene for doing macroarray
A large effort at macroarray and then sequencing would have yield more differences
An alternative would be to hybridized the subtractand against a large array
Other alternative is the isolation of cell type-specific genes
(LCM) rather than plaque-type-specific genes
(Stephen M.Schwartz et al.Circ Res 2001:89;471-473)
26. Richard T Lee et al. Treated cultured Human aortic SMC with
TNFα and used DNA microarray with 8600 genes to monitor the gene expression
Marked increase in eotaxin confirmed with northern blotting
Immunohistochemical analysis demonstrated overexpression of
eotaxin and its receptor in the Human atheroma (SMC)
Circulation;2000:102:2185-2189
27. McCaffrey et al. compared transcript profile of fibrous cap vs adjacent media
of 13 patients ,using macroarray (membrane 588 known genes)
Early growth response gene(Egr-1) was highly
expressed in lesion (confirmed by RT-PCR)
Many Erg-1 inducible genes including PDGF , TGF-β and ICAM-1
were also strongly elevated in the lesion
Immunocytochemistry indicated that Egr-1 was expressed in SMC
β ACTIN and GAPDH were use as housekeeping gene
J.C.I 2000,105:653-662
28. Adams et al. Compared gene expression of media of aorta and
vena cava, using cDNA microarray of 4048 known genes.
68 genes had consistent elevation in message expression the aorta.
The most differentially gene was Regulator of G Protein Signaling (RGS5).
Northern analysis and in situ hybridization were used to confirm the results.
Circulation Research 2000.8.623
29. R.M Lawn et al. examined the response of macrophages to exposure to
oxidized LDL, using microarray containing 10000 Human genes.
268 genes were found to be at least twofold up regulated.
Real Time -PCR was used to confirm the results.
Orphan nuclear receptors (PPARγ, LXR and RXR) and ABC1 were
among genes which unregulated after exposure.
J.B.C 2000:275;48, 37324-37332
30. L.A Mcintire et al. identified 52 genes with altered expression under shear stress
Using DNA microarray in primary human umbilical vein endothelial cells.
Significant increases in mRNA levels for 32 and significant
decreases in expression for 20 genes were reported.
The most enhanced genes were cytocromes P45 1A1 and 1B1
and human prostaglandin transporter.
Most dramatically down regulated genes were
connective tissue growth factor and endotheline-1.
Northern blot analysis confirmed the results obtained on microarray.
PNAS2001, 98:8955-8960
31. Brian K Coombes et al. used DNA macroarray to study the transcriptional
response of Endothelial cells to infection with C.Pneumonia.
C.Pneumonia infection up regulated m RNA expression for approximately
8% (20) of the genes studies (268).
Genes coding for cytokines (IL-1), Chemkines (MCP-1) and cellular growth factor
(PDGF) were the most prominently up regulated genes.
32. Proteomic is the study of the proteom or
the entire protein complement of a genom
It has been readily apparent that examining changes in the proteom
offers insight into Understanding cellular and molecular mechanisms
that cannot be obtained through genomic analysis.
A recent study analyzing human liver samples determined
the correlation coefficient between the amount of m RNA
present to the corresponding protein abundance to be
0.48 (Anderson and Seilhamer 1997).
33. Many genes are expressed constitutively and regulation
of their function is at the translational or posttranslational
Levels (ApoB ,CFTR, TCR).
Several studies have demonstrated selective TnI degradation under
Ischemia/reperfusion, partly responsible for contractile dysfunction
Observed after myocardial ischemia.( Circ Res.1999;84;9-20)
Virtually all known cellular signaling pathways are largely mediated
through a complex cascade of reversible protein phosphorylation.
34. Acute insults to cells lead to alteration in phenotype through rapid posttranslational
Modification of proteins, whereas in chronic disease states cotranslational and
Posttranslational protein modification occur in concert with altered gene expression.
Most proteomic studies in cardiovascular focused
in dilated cardiomyopathy and there is no report
of proteomic evaluation in vulnerable plaque.
Global proteome analysis provides a better representation of the
phenotype than does gene expression analysis.
35. Our research group at the vascular biology laboratory of Center for Vulnerable
Plaque Research in Texas Heart Institute is conducting a series of genomic and
proteomic experiments to shed light on the possible molecular mechanisms
involved in the onset and pathogenesis of atherosclerosis.
Differential gene and protein expression of morphologically advance, but stable
human atherosclerotic lesions and ruptured human atherosclerotic lesions are
examined in a large number of patients in the whole-mount specimens.
36. Transcript profile of blood monocytes from coronary patients with different
presentations and healthy controls will be examined to address the association of
gene expression and SNP with coronary risk.
Furthermore, Laser Captured Microdissection technology will be employed to
evaluate gene and protein expression in different cell populations of atheroma
plaques correlated with other markers (such as pH, Temperature, …).
We hope these approaches lead to better understanding of the
molecular process involved in development and complication of
vulnerable plaques.
37. The lack of information in genomic and particularly
proteomic approaches in vulnerable plaque is
apparent and this highlights need for genomic and
proteomic evaluation of plaque destabilization