MALDI-TOF-MS analysis was used to generate proteomic profiles from plasma samples to identify biomarkers for prostate cancer. Samples were prepared using magnetic beads to separate proteins, then analyzed using MALDI-TOF-MS. Bioinformatics tools were used to generate classification models to distinguish prostate cancer patients from healthy controls based on differences in peak intensities. A 5-peak model achieved 87.5% sensitivity and 92.9% specificity. The study demonstrated the potential of MALDI-TOF proteomic profiling for early prostate cancer screening and diagnosis in Egypt. Proteomic biomarkers may help reduce unnecessary biopsies and stratify patients in the future.
Immunosupuression in adult liver transplantation Abhishek Yadav
Basics about immunosuppressive drugs in liver transplantation and protocols for immunosuppression in adult liver transplantation. Discusses the basic immunology of transplant, common drugs and protocols used in special scenarios in transplantation.
The collection and processing of hematopoieticakshaya tomar
BASICS OF HSC COLLECTION AND PROCESSING INCLUDING ALL THE THREE SOURCES, A BRIEF ABOUT STEM CELL MOBILIZATION, STEM CELL SELECTION CRYOPRESERVATION AND DMSO
Immunosupuression in adult liver transplantation Abhishek Yadav
Basics about immunosuppressive drugs in liver transplantation and protocols for immunosuppression in adult liver transplantation. Discusses the basic immunology of transplant, common drugs and protocols used in special scenarios in transplantation.
The collection and processing of hematopoieticakshaya tomar
BASICS OF HSC COLLECTION AND PROCESSING INCLUDING ALL THE THREE SOURCES, A BRIEF ABOUT STEM CELL MOBILIZATION, STEM CELL SELECTION CRYOPRESERVATION AND DMSO
Objective: Ischemia-reperfusion (I/R) leads to reactive oxygen species formation and cell death in kidney tissue with injury and organ transplantation. Simvastatin (SIM) is an antioxidant, anti-inflammatory, and anticoagulant agent. Alterations in I/R-induced acute kidney injury model with SIM treatment were analyzed.
Study Design: Wistar rats (n=28) were grouped into Sham, Ischemia, I/R, and I/R+SIM treated. Left rat kidney renal vessels were clamped for 60 minutes for ischemia, and the I/R group had 6 hours of reperfusion. 10 mg/kg SIM was given orally for 28 days. MDA, GSH, and MPO were analyzed. Kidney tissues were paraffin embedded, and primary antibodies TNF-α and caspase-3 were applied for immunohistochemistry.
Results: In the I/R group, intense inflammatory cell infiltration around the vessels and necrosis in the glomerular structures were observed. In the treated group, proximal and distal tubular cells were found to be close to normal. Immunoexpression of caspase-3 in the ischemia group was positive in degenerative glomeruli. In the treated group, TNF-α expression was negative in the glomerular structures. MDA and MPO levels were significantly increased in ischemia and I/R.
Conclusion: We suggest that SIM treatment improved kidney tissue structure and function in a model of I/R injury.
Keywords: caspase-3; immunohistochemistry; ischemia/reperfusion; kidney; MPO; simvastatin
ABSTRACT- Coronary artery disease (CAD) is suspected as a leading cause of mortality in developed countries. Due
to cholesterol and fat deposit plaque is forming into the inner walls of the arteries of the heart, which leads to narrowing
of blood vessels of heart and reduce the blood flow rate into heart. Proprotein convertase subtilisin-like kexin type 9
(PCSK9) is one of the candidate gene that regulate lipoprotein retention pathway of CAD development. It is a newly
discovered serine protease that plays a key role in LDL-C homeostasis by mediating LDL receptor (LDLR). The LDL
receptor is breakdown through a post transcriptional mechanism and induces the production of very low-density
lipoprotein in the fasting state. The aim of this study was to investigate the frequency of single nucleotide
polymorphism (SNP) of PCSK9 gene of 155 CAD patients and 102 ages matched healthy controls. Serum lipids
including total cholesterol (TC), triglycerides (TG), HDL, LDL, and VLDL were analyzed. PCR-RFLP analysis was
carried out to genotype regions carrying Eam 1104I restriction site in the PCSK9. Gene considering significant
difference in serum TC, TG, HDL-C, LDL-C and VLDL-C levels (P<0.001, <0.0001) of patients and control samples.
In CAD patients, G allele frequency is less than A allele frequency. G allele is responsible for decreasing the
LDL: HDL ratio which shows evidence in having its protecting effect on the occurrence of CAD in West Bengal Population.
Key-words- CAD, PCSK9, SNP, Eam1104I, Polymorphism, West Bengal population
Objective: Ischemia-reperfusion (I/R) leads to reactive oxygen species formation and cell death in kidney tissue with injury and organ transplantation. Simvastatin (SIM) is an antioxidant, anti-inflammatory, and anticoagulant agent. Alterations in I/R-induced acute kidney injury model with SIM treatment were analyzed.
Study Design: Wistar rats (n=28) were grouped into Sham, Ischemia, I/R, and I/R+SIM treated. Left rat kidney renal vessels were clamped for 60 minutes for ischemia, and the I/R group had 6 hours of reperfusion. 10 mg/kg SIM was given orally for 28 days. MDA, GSH, and MPO were analyzed. Kidney tissues were paraffin embedded, and primary antibodies TNF-α and caspase-3 were applied for immunohistochemistry.
Results: In the I/R group, intense inflammatory cell infiltration around the vessels and necrosis in the glomerular structures were observed. In the treated group, proximal and distal tubular cells were found to be close to normal. Immunoexpression of caspase-3 in the ischemia group was positive in degenerative glomeruli. In the treated group, TNF-α expression was negative in the glomerular structures. MDA and MPO levels were significantly increased in ischemia and I/R.
Conclusion: We suggest that SIM treatment improved kidney tissue structure and function in a model of I/R injury.
Keywords: caspase-3; immunohistochemistry; ischemia/reperfusion; kidney; MPO; simvastatin
ABSTRACT- Coronary artery disease (CAD) is suspected as a leading cause of mortality in developed countries. Due
to cholesterol and fat deposit plaque is forming into the inner walls of the arteries of the heart, which leads to narrowing
of blood vessels of heart and reduce the blood flow rate into heart. Proprotein convertase subtilisin-like kexin type 9
(PCSK9) is one of the candidate gene that regulate lipoprotein retention pathway of CAD development. It is a newly
discovered serine protease that plays a key role in LDL-C homeostasis by mediating LDL receptor (LDLR). The LDL
receptor is breakdown through a post transcriptional mechanism and induces the production of very low-density
lipoprotein in the fasting state. The aim of this study was to investigate the frequency of single nucleotide
polymorphism (SNP) of PCSK9 gene of 155 CAD patients and 102 ages matched healthy controls. Serum lipids
including total cholesterol (TC), triglycerides (TG), HDL, LDL, and VLDL were analyzed. PCR-RFLP analysis was
carried out to genotype regions carrying Eam 1104I restriction site in the PCSK9. Gene considering significant
difference in serum TC, TG, HDL-C, LDL-C and VLDL-C levels (P<0.001, <0.0001) of patients and control samples.
In CAD patients, G allele frequency is less than A allele frequency. G allele is responsible for decreasing the
LDL: HDL ratio which shows evidence in having its protecting effect on the occurrence of CAD in West Bengal Population.
Key-words- CAD, PCSK9, SNP, Eam1104I, Polymorphism, West Bengal population
Dr. Richard Cote of Sylvester Comprehensive Cancer Center presented "New Technologies That Will Have an Impact on Cancer" at the 2011 WellBeingWell Conference in Miami.
This slide focuses on the causes and risk factors associated with cancer. It delves into the complexities of cancer development, highlighting factors such as genetic mutations, environmental influences, and lifestyle choices. Through informative visuals and concise text, the slide aims to raise awareness about the various elements that contribute to the onset of cancer. By understanding these key factors, individuals can make informed decisions to minimize their risk and prioritize preventive measures. This information sets the stage for subsequent slides that explore diagnosis, treatment options, and advancements in cancer research.
Robert P. Edwards, MD, Chair of OB/GYN/RS, Co-Director of Women's Cancer Program at University of Pittsburgh, offers information about the current state of immunotherapy for recurrent ovarian cancer patients.
Bladder Cancer Diagnostic-Initial Team ProjectSagar Desai
A mini-project to find biomarkers for bladder cancer diagnosis. We narrowed down our list of viable candidates down to three that could be used in combination to provide sensitivity and specificity values greater than 94%. Furthermore, we calculated long-term monitoring and payor costs as well as potential profit.
Development and Commercialisation of a Molecular Diagnostic CompanyMalavikaSankararaman
Development and commercialisation of a spin-out molecular diagnostics approach to detect different grades of Prostate Cancer using Fourier Transform Infrared Spectroscopy
Adipokines as a potential biomarkers for vascular complications in type 2 dia...Moustafa Rezk
Adipose tissue has come into focus as an endocrine organAdipose tissue secretes a variety of bioactive peptides (adipokines).Adipokines may locally regulate fat mass by modulating adipocyte size/number or angiogenesis and inversely increased fat mass leads to dysregulation of adipocyte functions.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
NYSORA Guideline
2 Case Reports of Gastric Ultrasound
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
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Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
Maldi tof-ms analysis in identification of prostate cancer
1. MALDI-TOF-MS analysis in
identification of prostate cancer
Prof./Moustafa Rizk
Clinical pathology department
Facutly of Medicine, Alexandria University
Clinical Pathology Department
Assiut university
20/2/2019
2. Today I’ll cover
Prostate Cancer Risk Factors
Prostate cancer detection using PSA
Proteomic pattern in Prostate Cancer
Sample preparation
Sample separation
Sample identification
Model Generation
Bioinformatics
The 5- peak model used
Conclusion
4. Epidemiology
In Egypt in the year 2008, prostate cancer diagnosis was approximately 1,661 men with a rate of 6.6 per 100,000
and 1,283 men were expected to die from PCa with a rate of 5.1 per 100,000
5. Five most frequent cancers in MENA compared with North America and rest of the World
6. Prostate Cancer Risk Factors
Established
Advancing Age
Race/ethnicity
Geography
Family history
Gene changes
Presence of androgens
Potential
High dietary fat , Obesity
Sexual transmitted diseases
Smoking
Alcohol consumption
Vitamin D or E deficiency
Selenium deficiency
7.
8. Pathophysiology
1. Prostatic intraepithelial neoplasia [PIN]
2. Adenocarcinoma (More than 95%)
3. Other rare types:
a. Ductal carcinoma ( 1% of prostatic adenocarcinoma )
b. Transitional cell carcinoma
c. Small cell (neuroendocrine) carcinoma
d. Mesenchymal tumors (0.1% to 0.2%)
e. Urothelial carcinoma (1% to 4% )
f. Metastatic (From colorectal tumours)
9. The US preventive services task force (USPSTF) no longer recommends routine PSA screening
10. Prostate cancer detection as a function of serum PSA level and
DRE findings in a contemporary series
11. PSA Screening
Pros Cons
PSA screening may help you detect prostate cancer early. Some prostate cancers are slow growing and never spread beyond
the prostate gland.
Cancer is easier to treat and is more likely to be cured if it's
diagnosed in the early stages of the disease.
Not all prostate cancers need treatment. Treatment for prostate
cancer may have risks and side effects, including urinary
incontinence, erectile dysfunction or bowel dysfunction.
PSA testing can be done with a simple, widely available blood test. PSA tests aren't foolproof. It's possible for your PSA levels to be
elevated when cancer isn't present, and to not be elevated when
cancer is present.
For some men, knowing is better than not knowing. Having the test
can provide you with a certain amount of reassurance — either that
you probably don't have prostate cancer or that you do have it and
can now have it treated.
A diagnosis of prostate cancer can provoke anxiety and confusion.
Concern that the cancer may not be life-threatening can make
decision-making complicated.
The number of deaths from prostate cancer has gone down since
PSA testing became available.
PSA testing has lowered deaths, but the number may not be
substantial enough to justify the cost and possibility of harm to the
person undergoing the testing.
12. Schematic outline presenting the key elements of routine clinical practice in the management of patients with prostate cancer.
The context of use for novel biomarkers is indicated in each case.
13. Proteomic pattern in Prostate Cancer
Sample preparation
Platelet-depleted EDTA plasma is preferable to serum
The addition of protease inhibitors is recommended, but should be incorporated
early and used wisely
Transport of samples must be on ice
Samples to be centrifuged in a cold centrifuge at 4oC for 15 minutes at 1800 g
Samples should be aliquoted in DNA low bind Eppendorf tubes
Eppendorf was numbered and stored in a box in a -80oC freezer
Further, the use of reference materials for quality control and quality assurance
is recommended
All samples during the collection should be handled in a similar manner.
14. Sample separation
Using magnetic beads as a method for peptide/protein capture
from complex biological samples :
WCX (weak cation exchange) separate proteins based on charge
RPC18 beads C8 (reversed phase) separate proteins based on strong
hydrophobic interaction
MagSi-WCX beads
Efficient and reproducible way before MALDI-TOF/MS analysis
15. 1. 1 µL of the sample elute was applied
to a target spot and left to dry at
room temperature.
2. Then 1 µL of MALDI-Matrix
HCCA was applied on the top of the
sample spot and left to dry.
3. 2-4 spots were spotted on the target
for each sample.
Polished steel target
Sample spotting on the polished steel target
17. FlexControl software allows the introduction of the target into the
MS.
Before starting the MS analysis, the FlexControl™ software was
calibrated and optimized using the ClinProt standard.
17
Spectra Acquisition
Using MALDI-TOF-MS (Bruker Daltonics, Germany)
18. Constitution of the ClinProt standard
Calibration was done using
Clinprot standard (CPA)
which was spotted on the
target and tested as the
samples.
Detection limit of mass spectrometer was set to 800-20000 Da
19. Flex control analysis program
For each spot, 3000 shots were done by shooting 500 laser shots at 6 different spot positions
After finishing the shooting of spots of each sample, they were gathered into one spectrum
21. Analyte ions are produced after
ionization in the ion source.
The ions that are produced are
separated according to their
mass-to-charge ratio (m/z)
The output, which is recorded
at the detector, is the intensity
at different m/z values.
The result is visualized as a
m/z vs intensity (mass
spectrum)
Mass Spectrum
22. Typical MALDI-TOF MS spectrum
Each ion has a single charge
(z = 1); thus, the m/z ratio is
equal to the mass, meaning
the mass is the variable that
determines the time of flight
and which affects the
separation
23. Bioinformatics is the field of science in which biology, computer science, and information
technology merge to form a single discipline. As large volumes of proteomics data are generated,
subsequent database searching must keep pace.
Bioinformatics and database utilization
3
23
Definition
http://www.openms.de/
WHAT IS OPENMS?
OpenMS offers an open-source software library for LC/MS data management
and analyses.
It provides an infrastructure for the rapid development of mass spectrometry
related software
OpenMS is free software available
24.
25. Each group has been randomly distributed into two sets: training set for model generation, and
validation set for external validation.
The spectra of the training sets of studied groups were loaded onto the software.
Models were generated using Genetic Algorithm (GA), Supervised Neural Network (SNN) and
QuickClassifier (QC).
25
ClinProTools Version: 3.0 build 22
Name Algo
Validation
XVal X1 X2
Recogn
ition
Capabil
ity
Patients vs controls GA 91.5 % 88.1 % 94.8 % 100 %
Patients vs controls SNN 84 % 90.5 % 77.6 % 100 %
Patients vs controls QC 86.4 % 95.2 % 77.6 % 98.2 %
Model Generation
26. The 5- peak model used for discriminating between prostate cancer and
healthy control
26
Index Mass Start Mass End Mass
11 2485.97 2478.63 2496
3 1061.24 1057.89 1068.51
24 3295.1 3288.51 3306.45
33 4612.54 4603.15 4622.91
14 2817.28 2808.44 2825.01
This model achieved a sensitivity of 87.5 % and a specificity of 92.9 % during
external validation.
27. spectra of class I (patients) in red color against class II
(controls) in green
29. The peak is over expressed
.
Peak 24 with m/z ratio 3295.1
Patients (red)
Controls (grey)
Peak distribution command
Peak 24 with m/z ratio 3295.1
Patients (red)
Controls (grey)
31. It could be concluded that:
01
02
Inthe era of “big data” and “personalized medicine”
proteomics-based biomarkers hold great promise to
provide clinically applicable tools
31
MALDI-TOF proteomic profiling represents a new
frontier for screening and early diagnosis of Prostate
cancer in Egypt.
32. 32
Proteomic biomarkers alone and or in
combination with clinical and pathological
risk calculators may be in future expected
to improve on decreasing the unnecessary
biopsies, stratify low risk patients, and
predict response to treatment
One million men are diagnosed with Prostate Cancer (PC) worldwide and over 300,000 are dying annually of the disease . This corresponds to more than 3000 newly diagnosed cases and around 841 deaths every day
One million men are diagnosed with Prostate Cancer (PC) worldwide and over 300,000 are dying annually of the disease . This corresponds to more than 3000 newly diagnosed cases and around 841 deaths every day
Prostate cancer antigen-3 (PCA3): It is only expressed in human prostate tissue, and the gene is highly overexpressed in prostate cancer.(13, 14) Because of its restricted expression profile, the PCA3 RNA is useful as a tumour marker. It is worth noting that although PCA3 is prostate specific it is not cancer-specific.(15)
Alpha-methyl-coA racemase (AMACR): Increased levels of AMACR protein concentration and activity are associated with prostate cancer, and the enzyme is used widely as a biomarker.(16, 17)
Transmembrane protease serine 2: erythroblast transformation specific related gene (TMPRSS2: ERG) gene fusion:
*(−) DRE nonsuspicious for cancer; (+) DRE suspicious for cancer. Cancer detection rate is the number of cancers found in those screened (total number of detected cancers divided by the total number of men screened). Cancer yield is the total number of cancers detected divided by the total number of men undergoing a biopsy. However, PSA doesn’t always aid in diagnosis specially due to the rising incidence of clinically relevant prostate cancers in patients with low PSA serum levels (less than 4.0ng/ml)
Significant efforts have been undertaken to identify novel biomarkers that can accurately discriminate between indolent and aggressive cancer forms and indicate those men at high risk for developing prostate cancer that require immediate treatment
Standardization of sample collection and handling is probably the main challenge of high-throughput proteomic methods for disease biomarker discovery in human plasma.There is a large list of pre-analytical variables that can affect the analysis of blood-derived samples including; time, conditions of storage, usage of protease inhibitors and the number of freeze/thaw cycles
Proteins bound to the magnetic beads are then eluted, diluted and directly analyzed by MALDI-TOF/MS. Magnetic beads-based enrichment approaches have the potential to capture and enrich low abundance and low molecular weight species. The large surface area of the magnetic beads provides a high binding capacity, as the specific basic groups on the surface can sufficiently combine with the low-abundance proteins in the serum increasing the varieties of proteins captured.(257, 258) As a result of that, it ensures a favorable specific system; with simple and rapid operation, preliminary treatment can be finished through; the simple blending, washing and elution process, which is suitable for clinical examination.
Analyte ions are produced after ionization in the ion source, there are several ionization methods, but the most commonly used methods in proteomics are electrospray ionization (ESI) and matrix-assisted laser desorption ionization (MALDI). The ions that are produced are then transferred through a vacuum tube to the mass analyzer where they are separated according to their mass-to-charge ratio (m/z), usually each ion has a single charge (z = 1); thus, the m/z ratio is equal to the mass, meaning the mass is the variable that determines the time of flight and which affects the separation. The physical entity measured by all mass analyzers is the m/z value of the ions. The output, which is recorded at the detector, is the intensity at different m/z values. The result is visualized as a m/z vs intensity plot called the mass spectrum
. MALDI is an improvement of the laser desorption ionization (LDI) technique. In LDI, a soluble analyte is air-dried on a metal surface and the ionization is achieved by irradiation with an ultraviolet laser. The disadvantage of LDI is that it has low sensitivity, the ionization method causes ion fragmentation and the signal is very dependent on the ultraviolet-absorbing characteristics of the analyte.(271) This is solved with MALDI by decoupling the energy needed for desorption and ionization of the analyte. In MALDI, the analyte is mixed with a compound called the matrix, which absorbs the energy from the laser. The sample is co-crystallized with an excess amount of the matrix (figure 11). A variety of matrices (small aromatic acids) can be used. The aromatic group absorbs at the wavelength of the laser light, while the acid supports the ionization of the analyte. Irradiation with a short-pulsed laser, often a 337-nm N2 laser, causes mainly ionization of the matrix followed by energy and proton transfer to the analyte.(272) The charged ions are then accelerated at a fixed potential, where these separate from each other on the basis of their mass-to-charge ratio (m/z). The charged analytes are then detected and measured using different types of mass analyzers like quadrupole mass analyzers, ion trap analyzers and time of flight (TOF) analyzers as shown in figure (12).