This document provides an overview of apoptosis, or programmed cell death. It begins with an introduction defining apoptosis and its importance in development, aging, and disease. It then describes the main types and mechanisms of apoptosis, including the extrinsic and intrinsic pathways. Key features of apoptosis like morphology, assays to detect it, and differences from necrosis are summarized. The document concludes by discussing other forms of programmed cell death and clinical applications of understanding apoptosis.
Apoptosis is a programmed cell death process that removes unwanted cells. It is mediated by caspase enzymes and leads to cell fragmentation into apoptotic bodies that are phagocytosed. There are two main pathways - the intrinsic mitochondrial pathway, where cellular stress leads to mitochondrial cytochrome c release and caspase activation, and the extrinsic death receptor pathway, where death ligands such as FasL bind receptors and recruit caspase-8. Both pathways activate executioner caspases like caspase-3 to degrade cellular proteins and carry out apoptosis. Disorders can arise from too little apoptosis, allowing abnormal cell survival like in cancer, or excessive apoptosis leading to cell loss in diseases like neurodegeneration.
Apoptosis - programmed cell death that occurs in multicellular organismsMeethuRappai1
This document defines apoptosis and describes the intrinsic and extrinsic pathways that regulate programmed cell death. Apoptosis is characterized by activation of enzymes that degrade a cell's nuclear DNA and proteins. It can be triggered through intrinsic signals like DNA damage or extrinsic factors like death receptors. Both pathways activate caspases that execute apoptosis. Phagocytosis efficiently removes apoptotic cells to prevent inflammation. Dysregulation of apoptosis can cause cancer if cells survive too long or neurodegenerative diseases if excessive cell death occurs.
physiology of apoptosis first year mbbs medical.pdfDratoshKatiyar
The document summarizes apoptosis (programmed cell death) through three parts:
Part 1 introduces apoptosis, its history, morphological hallmarks, and provides examples of apoptosis in development including web-footed chickens.
Part 2 describes the key mechanisms and pathways of apoptosis including caspases, the intrinsic mitochondrial pathway involving Bcl-2 proteins and p53, and the extrinsic death receptor pathway.
Part 3 outlines the importance of apoptosis in normal physiology and development and consequences of deregulated apoptosis such as neurodegeneration when in excess and cancer when deficient.
The document discusses apoptosis (programmed cell death) through three parts:
1) An introduction to apoptosis, its history, and how it is important in development and physiology.
2) The mechanisms and pathways of apoptosis, including caspases, the intrinsic mitochondrial pathway, extrinsic death receptor pathway, and Bcl-2 family of proteins.
3) The importance of apoptosis in normal development and physiology through tissue sculpting, but that defects can lead to diseases like cancer, autoimmunity, and neurodegeneration when there is too much or too little apoptosis.
The document provides an overview of apoptosis, or programmed cell death. It describes the three main pathways that can trigger apoptosis: the extrinsic or death receptor pathway, the intrinsic or mitochondrial pathway, and the perforin/granzyme pathway. The pathways activate initiator caspases that go on to activate executioner caspases, leading to characteristic cell changes like nuclear fragmentation and membrane blebbing. Apoptotic cells are then phagocytosed to prevent inflammation.
Apoptosis is a
-pathway of cell death that is
-induced by an internally regulated program
-in which cells destined to die activate intrinsic enzymes that --degrade the cells’ own nuclear DNA and also nuclear and cytoplasmic proteins
-With minimal host reaction.
Apoptosis also known as cell suicide. Difference between necrosis and apoptosis. Changes in apoptosis. Mechanism of apoptosis. Functional significance of apoptosis. Applied aspects of apoptosis
Apoptosis is a programmed cell death process that removes unwanted cells. It is mediated by caspase enzymes and leads to cell fragmentation into apoptotic bodies that are phagocytosed. There are two main pathways - the intrinsic mitochondrial pathway, where cellular stress leads to mitochondrial cytochrome c release and caspase activation, and the extrinsic death receptor pathway, where death ligands such as FasL bind receptors and recruit caspase-8. Both pathways activate executioner caspases like caspase-3 to degrade cellular proteins and carry out apoptosis. Disorders can arise from too little apoptosis, allowing abnormal cell survival like in cancer, or excessive apoptosis leading to cell loss in diseases like neurodegeneration.
Apoptosis - programmed cell death that occurs in multicellular organismsMeethuRappai1
This document defines apoptosis and describes the intrinsic and extrinsic pathways that regulate programmed cell death. Apoptosis is characterized by activation of enzymes that degrade a cell's nuclear DNA and proteins. It can be triggered through intrinsic signals like DNA damage or extrinsic factors like death receptors. Both pathways activate caspases that execute apoptosis. Phagocytosis efficiently removes apoptotic cells to prevent inflammation. Dysregulation of apoptosis can cause cancer if cells survive too long or neurodegenerative diseases if excessive cell death occurs.
physiology of apoptosis first year mbbs medical.pdfDratoshKatiyar
The document summarizes apoptosis (programmed cell death) through three parts:
Part 1 introduces apoptosis, its history, morphological hallmarks, and provides examples of apoptosis in development including web-footed chickens.
Part 2 describes the key mechanisms and pathways of apoptosis including caspases, the intrinsic mitochondrial pathway involving Bcl-2 proteins and p53, and the extrinsic death receptor pathway.
Part 3 outlines the importance of apoptosis in normal physiology and development and consequences of deregulated apoptosis such as neurodegeneration when in excess and cancer when deficient.
The document discusses apoptosis (programmed cell death) through three parts:
1) An introduction to apoptosis, its history, and how it is important in development and physiology.
2) The mechanisms and pathways of apoptosis, including caspases, the intrinsic mitochondrial pathway, extrinsic death receptor pathway, and Bcl-2 family of proteins.
3) The importance of apoptosis in normal development and physiology through tissue sculpting, but that defects can lead to diseases like cancer, autoimmunity, and neurodegeneration when there is too much or too little apoptosis.
The document provides an overview of apoptosis, or programmed cell death. It describes the three main pathways that can trigger apoptosis: the extrinsic or death receptor pathway, the intrinsic or mitochondrial pathway, and the perforin/granzyme pathway. The pathways activate initiator caspases that go on to activate executioner caspases, leading to characteristic cell changes like nuclear fragmentation and membrane blebbing. Apoptotic cells are then phagocytosed to prevent inflammation.
Apoptosis is a
-pathway of cell death that is
-induced by an internally regulated program
-in which cells destined to die activate intrinsic enzymes that --degrade the cells’ own nuclear DNA and also nuclear and cytoplasmic proteins
-With minimal host reaction.
Apoptosis also known as cell suicide. Difference between necrosis and apoptosis. Changes in apoptosis. Mechanism of apoptosis. Functional significance of apoptosis. Applied aspects of apoptosis
Cell death, also known as programmed cell death, occurs through various pathways including apoptosis, autophagy, and necrosis. Apoptosis, or programmed cell death, involves two main pathways - the intrinsic pathway which is triggered by cellular stress and the extrinsic pathway which is triggered by death ligands binding to cell surface death receptors. Both pathways activate caspases that break down cellular components leading to cell death. Autophagy is the natural and regulated mechanism by which cells degrade and recycle unnecessary or dysfunctional cellular components through the formation of autophagosomes and lysosomal degradation. Necrosis is unregulated cell death caused by external factors like infection, trauma or ischemia and results in the premature death of cells and tissue damage
Hi! I am Komal Sankaran, M.Sc. Biotechnology (Pune University Gold Medalist, 2013), CSIR-NET SPM fellow (Jun- 2014, 4th rank), CSIR-NET- LS (Dec 2013, 2nd rank), DBT JRF category- I. Please contact if anyone is interested in Life Sciences CSIR-NET coaching in Pune (Khadki area).
Email- komalsan91@gmail.com
Apoptosis is a form of programmed cell death that is mediated by activation of caspases. It plays an important role in both physiological processes like development and pathological conditions like DNA damage. The key features of apoptosis include cell shrinkage, chromatin condensation, formation of apoptotic bodies, and phagocytosis of cell fragments without eliciting inflammation. The intrinsic and extrinsic pathways initiate apoptosis through an imbalance of survival and death signals within cells.
Apoptosis is a tightly regulated and programmed form of cell death that is essential for tissue homeostasis. It is characterized by nuclear fragmentation, membrane blebbing, and phagocytosis of cellular debris without inflammation. The intrinsic pathway is mediated by mitochondria and pro-apoptotic Bcl-2 family proteins, while the extrinsic pathway involves death receptors and caspase activation. Caspases are cysteine proteases that dismantle the cell through cleavage of structural proteins and DNA. Apoptosis must be balanced, as too little can lead to cancer and too much can contribute to diseases.
1. Apoptosis is a tightly regulated process of programmed cell death that involves the activation of caspases and degradation of nuclear and cellular components.
2. It can be triggered through intrinsic mitochondrial pathways or extrinsic death receptor pathways and plays an important physiological role in development, immune system maturation, and maintenance of tissue homeostasis.
3. Dysregulation of apoptosis can contribute to cancer, autoimmune diseases, and neurodegenerative disorders by allowing cells to survive inappropriately or undergo excessive cell death.
Apoptosis is a tightly regulated form of programmed cell death that plays an important role in tissue homeostasis, development, and the immune system. It is characterized by fragmentation of DNA and the nucleus. There are two main pathways that trigger apoptosis - the intrinsic mitochondrial pathway and the extrinsic death receptor pathway - which both activate caspases and lead to dismantling of the cell. Apoptosis is important for removing damaged, unneeded, or infected cells, and balancing it with cell proliferation is critical for health.
Apoptosis is a programmed cell death process that occurs in multicellular organisms. It is characterized by cell shrinkage, nuclear fragmentation, and global mRNA decay. Apoptosis ensures the orderly disposal of cells and occurs during normal cell turnover, development, and aging. It also helps remove infected, damaged or unnecessary cells. There are two main pathways of apoptosis - the intrinsic pathway which is triggered by intracellular signals within the cell, and the extrinsic pathway which is initiated by activation of cell surface death receptors by extracellular ligands. Both pathways activate caspases, a family of cysteine proteases, that trigger the degradation of proteins and DNA fragmentation that leads to cell death. Deregulation of apoptosis can contribute to diseases like cancer
The document summarizes key aspects of apoptosis including:
- The origins and definition of the term apoptosis from Greek meaning "falling leaves".
- The significance of apoptosis in development and maintenance of tissues by removing excess or damaged cells.
- The morphological features of apoptosis including membrane blebbing, nuclear fragmentation, and formation of apoptotic bodies.
- The molecular mechanisms including caspase signaling pathways like the intrinsic pathway involving mitochondria and the extrinsic pathway involving death receptors.
- Regulatory mechanisms involving proteins like Bcl-2 that balance survival and death signals.
- Dysregulation of apoptosis can lead to diseases like cancer, autoimmune disorders, and HIV infection.
Apoptosis is a programmed cell death process that occurs in physiological and pathological conditions. It is mediated by caspases and involves two main pathways - the intrinsic mitochondrial pathway and the extrinsic death receptor pathway. Both pathways activate initiator and executioner caspases that degrade cellular proteins and lead to characteristic morphological changes including cell shrinkage, nuclear fragmentation, and formation of apoptotic bodies that are phagocytosed without inflammation. Apoptosis is regulated and differs from necrosis in being an energy-dependent process without inflammatory response.
Every cell has a natural life cycle involving birth and death. There are two main types of cell death: necrosis and apoptosis. Necrosis is accidental cell death due to external injury, while apoptosis is a carefully regulated process in which cells play an active role in their own death. During apoptosis, cells shrink, break into fragments, and are phagocytosed without causing inflammation. Precisely regulated apoptosis is important for normal development, immune function, and homeostasis, while defects can lead to diseases. Many cancer therapies aim to trigger the apoptosis pathway in tumor cells.
The document summarizes different types of cell death including programmed cell death (PCD), apoptosis, necrosis, and autophagy. It describes key aspects of apoptosis such as the intrinsic and extrinsic pathways, the role of caspases and Bcl-2 proteins, mitochondrial involvement, and morphological changes cells undergo during apoptosis. Necrosis is described as unprogrammed cell death caused by external factors like trauma or infection. Autophagy is noted as another form of programmed cell death.
Intrinsic and Extrinsic Pathway of ApoptosisAnantha Kumar
This document provides an overview of apoptosis (programmed cell death) at the cellular level. It discusses how apoptosis can be initiated through either the intrinsic or extrinsic pathway. The intrinsic pathway involves signals within the cell like mitochondrial membrane permeability, while the extrinsic pathway involves death receptors on the cell surface and their ligands. Key proteins and complexes involved in each pathway are caspase enzymes and the apoptosome. Research on apoptosis has increased understanding of diseases like cancer that involve deregulated cell proliferation and death.
The document discusses apoptosis, or programmed cell death. It begins by defining apoptosis and explaining that it is a normal physiological process in multicellular organisms for tissue homeostasis and development. Apoptosis is regulated by both pro-apoptotic and anti-apoptotic factors like the Bcl-2 family of proteins. It involves characteristic morphological and biochemical changes in cells, including blebbing, nuclear fragmentation, and DNA fragmentation. Caspases play a central role in apoptosis by activating a cascade of proteolytic enzymes. Apoptosis occurs through both the intrinsic mitochondrial pathway and the extrinsic death receptor pathway.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Apoptosis, or programmed cell death, is a vital process in the body that occurs through development, aging, and when cells are damaged. It is characterized by distinct morphological changes and biochemical mechanisms. The process involves caspase activation and a complex cascade of events. There are three main pathways that trigger apoptosis - the intrinsic pathway which involves mitochondria, the extrinsic or death receptor pathway activated by extracellular signals, and the perforin/granzyme pathway used by cytotoxic T cells. All pathways ultimately activate executioner caspases like caspase-3 to carry out the final stages of apoptosis.
Add MTT reagent and incubate. Mitochondrial enzymes in viable cells convert MTT into an insoluble purple formazan product. Lyse cells and solubilize formazan with solvent. Measure absorbance which is directly proportional to number of viable cells. The more viable cells, the higher the absorbance. MTT assay is a sensitive, quantitative and reliable colorimetric method to measure cell viability and proliferation.
Apoptosis is a tightly regulated form of programmed cell death that occurs both during normal development and in disease states. It is characterized by cell shrinkage, chromatin condensation, and fragmentation of the cell into membrane-bound vesicles that are phagocytosed without eliciting inflammation. Apoptosis is mediated by caspases, cysteine proteases that exist as inactive proenzymes and become activated through either the intrinsic mitochondrial pathway or extrinsic death receptor pathway. In the mitochondrial pathway, signals alter the balance of pro- and anti-apoptotic BCL2 family proteins, allowing mitochondrial outer membrane permeabilization and cytochrome c release, leading to caspase activation and cell death.
The document discusses various types of programmed cell death (PCD), including apoptosis, autophagy, paraptosis, autoschizis, oncosis, and necrosis. It provides details on the characteristics and mechanisms of apoptosis and autophagy. Apoptosis involves blebbing, cell shrinkage, nuclear fragmentation, and is mediated by caspases through the intrinsic and extrinsic pathways. Autophagy results in autophagosomic-lysosomal degradation of cytoplasmic contents and organelles. The document also discusses some plant-specific features of apoptosis and its role in pollen self-incompatibility.
30 SLIDE SHOW JOURNAL Mimickers Melanoma in Situ Dt. 20.11.2023.pptxSarithaRani4
This study examines expression of the PRAME marker in mimickers of melanoma in situ (MIS), including Paget's disease, extramammary Paget's disease, and pagetoid squamous cell carcinoma in situ. The study finds that PRAME expression is variable in these mimickers and therefore is not a reliable marker to differentiate them from MIS. PRAME staining was seen in some cases of each entity, with weak or moderate intensity in most cases. The study concludes that while PRAME may suggest a non-squamous lineage, other immunostains are needed to confirm diagnoses of pagetoid lesions.
The document provides information about embedding and section cutting techniques in histopathology. It discusses the aims of embedding tissue, such as providing support and preventing distortion. Common embedding mediums include paraffin wax, resin, agar, and gelatin. Paraffin wax is the most popular due to being inexpensive, non-toxic, and allowing long term tissue storage. The document outlines the tissue embedding process and describes equipment used, including embedding molds and the Tissue-Tek system. Tissue orientation in the block is important for visualizing the desired morphology.
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Cell death, also known as programmed cell death, occurs through various pathways including apoptosis, autophagy, and necrosis. Apoptosis, or programmed cell death, involves two main pathways - the intrinsic pathway which is triggered by cellular stress and the extrinsic pathway which is triggered by death ligands binding to cell surface death receptors. Both pathways activate caspases that break down cellular components leading to cell death. Autophagy is the natural and regulated mechanism by which cells degrade and recycle unnecessary or dysfunctional cellular components through the formation of autophagosomes and lysosomal degradation. Necrosis is unregulated cell death caused by external factors like infection, trauma or ischemia and results in the premature death of cells and tissue damage
Hi! I am Komal Sankaran, M.Sc. Biotechnology (Pune University Gold Medalist, 2013), CSIR-NET SPM fellow (Jun- 2014, 4th rank), CSIR-NET- LS (Dec 2013, 2nd rank), DBT JRF category- I. Please contact if anyone is interested in Life Sciences CSIR-NET coaching in Pune (Khadki area).
Email- komalsan91@gmail.com
Apoptosis is a form of programmed cell death that is mediated by activation of caspases. It plays an important role in both physiological processes like development and pathological conditions like DNA damage. The key features of apoptosis include cell shrinkage, chromatin condensation, formation of apoptotic bodies, and phagocytosis of cell fragments without eliciting inflammation. The intrinsic and extrinsic pathways initiate apoptosis through an imbalance of survival and death signals within cells.
Apoptosis is a tightly regulated and programmed form of cell death that is essential for tissue homeostasis. It is characterized by nuclear fragmentation, membrane blebbing, and phagocytosis of cellular debris without inflammation. The intrinsic pathway is mediated by mitochondria and pro-apoptotic Bcl-2 family proteins, while the extrinsic pathway involves death receptors and caspase activation. Caspases are cysteine proteases that dismantle the cell through cleavage of structural proteins and DNA. Apoptosis must be balanced, as too little can lead to cancer and too much can contribute to diseases.
1. Apoptosis is a tightly regulated process of programmed cell death that involves the activation of caspases and degradation of nuclear and cellular components.
2. It can be triggered through intrinsic mitochondrial pathways or extrinsic death receptor pathways and plays an important physiological role in development, immune system maturation, and maintenance of tissue homeostasis.
3. Dysregulation of apoptosis can contribute to cancer, autoimmune diseases, and neurodegenerative disorders by allowing cells to survive inappropriately or undergo excessive cell death.
Apoptosis is a tightly regulated form of programmed cell death that plays an important role in tissue homeostasis, development, and the immune system. It is characterized by fragmentation of DNA and the nucleus. There are two main pathways that trigger apoptosis - the intrinsic mitochondrial pathway and the extrinsic death receptor pathway - which both activate caspases and lead to dismantling of the cell. Apoptosis is important for removing damaged, unneeded, or infected cells, and balancing it with cell proliferation is critical for health.
Apoptosis is a programmed cell death process that occurs in multicellular organisms. It is characterized by cell shrinkage, nuclear fragmentation, and global mRNA decay. Apoptosis ensures the orderly disposal of cells and occurs during normal cell turnover, development, and aging. It also helps remove infected, damaged or unnecessary cells. There are two main pathways of apoptosis - the intrinsic pathway which is triggered by intracellular signals within the cell, and the extrinsic pathway which is initiated by activation of cell surface death receptors by extracellular ligands. Both pathways activate caspases, a family of cysteine proteases, that trigger the degradation of proteins and DNA fragmentation that leads to cell death. Deregulation of apoptosis can contribute to diseases like cancer
The document summarizes key aspects of apoptosis including:
- The origins and definition of the term apoptosis from Greek meaning "falling leaves".
- The significance of apoptosis in development and maintenance of tissues by removing excess or damaged cells.
- The morphological features of apoptosis including membrane blebbing, nuclear fragmentation, and formation of apoptotic bodies.
- The molecular mechanisms including caspase signaling pathways like the intrinsic pathway involving mitochondria and the extrinsic pathway involving death receptors.
- Regulatory mechanisms involving proteins like Bcl-2 that balance survival and death signals.
- Dysregulation of apoptosis can lead to diseases like cancer, autoimmune disorders, and HIV infection.
Apoptosis is a programmed cell death process that occurs in physiological and pathological conditions. It is mediated by caspases and involves two main pathways - the intrinsic mitochondrial pathway and the extrinsic death receptor pathway. Both pathways activate initiator and executioner caspases that degrade cellular proteins and lead to characteristic morphological changes including cell shrinkage, nuclear fragmentation, and formation of apoptotic bodies that are phagocytosed without inflammation. Apoptosis is regulated and differs from necrosis in being an energy-dependent process without inflammatory response.
Every cell has a natural life cycle involving birth and death. There are two main types of cell death: necrosis and apoptosis. Necrosis is accidental cell death due to external injury, while apoptosis is a carefully regulated process in which cells play an active role in their own death. During apoptosis, cells shrink, break into fragments, and are phagocytosed without causing inflammation. Precisely regulated apoptosis is important for normal development, immune function, and homeostasis, while defects can lead to diseases. Many cancer therapies aim to trigger the apoptosis pathway in tumor cells.
The document summarizes different types of cell death including programmed cell death (PCD), apoptosis, necrosis, and autophagy. It describes key aspects of apoptosis such as the intrinsic and extrinsic pathways, the role of caspases and Bcl-2 proteins, mitochondrial involvement, and morphological changes cells undergo during apoptosis. Necrosis is described as unprogrammed cell death caused by external factors like trauma or infection. Autophagy is noted as another form of programmed cell death.
Intrinsic and Extrinsic Pathway of ApoptosisAnantha Kumar
This document provides an overview of apoptosis (programmed cell death) at the cellular level. It discusses how apoptosis can be initiated through either the intrinsic or extrinsic pathway. The intrinsic pathway involves signals within the cell like mitochondrial membrane permeability, while the extrinsic pathway involves death receptors on the cell surface and their ligands. Key proteins and complexes involved in each pathway are caspase enzymes and the apoptosome. Research on apoptosis has increased understanding of diseases like cancer that involve deregulated cell proliferation and death.
The document discusses apoptosis, or programmed cell death. It begins by defining apoptosis and explaining that it is a normal physiological process in multicellular organisms for tissue homeostasis and development. Apoptosis is regulated by both pro-apoptotic and anti-apoptotic factors like the Bcl-2 family of proteins. It involves characteristic morphological and biochemical changes in cells, including blebbing, nuclear fragmentation, and DNA fragmentation. Caspases play a central role in apoptosis by activating a cascade of proteolytic enzymes. Apoptosis occurs through both the intrinsic mitochondrial pathway and the extrinsic death receptor pathway.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Apoptosis, or programmed cell death, is a vital process in the body that occurs through development, aging, and when cells are damaged. It is characterized by distinct morphological changes and biochemical mechanisms. The process involves caspase activation and a complex cascade of events. There are three main pathways that trigger apoptosis - the intrinsic pathway which involves mitochondria, the extrinsic or death receptor pathway activated by extracellular signals, and the perforin/granzyme pathway used by cytotoxic T cells. All pathways ultimately activate executioner caspases like caspase-3 to carry out the final stages of apoptosis.
Add MTT reagent and incubate. Mitochondrial enzymes in viable cells convert MTT into an insoluble purple formazan product. Lyse cells and solubilize formazan with solvent. Measure absorbance which is directly proportional to number of viable cells. The more viable cells, the higher the absorbance. MTT assay is a sensitive, quantitative and reliable colorimetric method to measure cell viability and proliferation.
Apoptosis is a tightly regulated form of programmed cell death that occurs both during normal development and in disease states. It is characterized by cell shrinkage, chromatin condensation, and fragmentation of the cell into membrane-bound vesicles that are phagocytosed without eliciting inflammation. Apoptosis is mediated by caspases, cysteine proteases that exist as inactive proenzymes and become activated through either the intrinsic mitochondrial pathway or extrinsic death receptor pathway. In the mitochondrial pathway, signals alter the balance of pro- and anti-apoptotic BCL2 family proteins, allowing mitochondrial outer membrane permeabilization and cytochrome c release, leading to caspase activation and cell death.
The document discusses various types of programmed cell death (PCD), including apoptosis, autophagy, paraptosis, autoschizis, oncosis, and necrosis. It provides details on the characteristics and mechanisms of apoptosis and autophagy. Apoptosis involves blebbing, cell shrinkage, nuclear fragmentation, and is mediated by caspases through the intrinsic and extrinsic pathways. Autophagy results in autophagosomic-lysosomal degradation of cytoplasmic contents and organelles. The document also discusses some plant-specific features of apoptosis and its role in pollen self-incompatibility.
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Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
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3. INTRODUCTION
What is apoptosis ?
• The term apoptosis was first recognized in 1972 by the distinctive
morphologic appearance of membrane bound fragments derived from cells
and named after the Greek designation for ‘’falling off’’.
• Apoptosis is a type of cell death that is induced by a tightly regulated suicide
program in which cells destined to die activate intrinsic enzymes that
degrade the cells genomic DNA and nuclear and cytoplasmic proteins.
• Apoptosis has since been recognized and accepted as a distinctive and
important mode of “programmed” cell death, which involves the genetically
determined elimination of cells.
4. Why apoptosis ?
• Normal during development and aging – homeostatic
mechanism
• Defense mechanism - immune reactions or when cells are
damaged by disease or noxious agents
• Stimulus- physiological or pathological
Irradiation
Chemotherapy
Corticosteroids
5. • Does all cells respond to stimulus?
• Cells express Fas or TNF receptors that can lead to apoptosis via
ligand binding and protein cross-linking.
• Cells have a default death pathway that must be blocked by a
survival factor such as a hormone or growth factor
• Apoptosis vs Necrosis, two processes that can occur independently,
sequentially, as well as simultaneously
6. • Apoptosis is a coordinated and often energy-
dependent process that involves the activation of a
group of cysteine proteases called “caspases” and a
complex cascade of events.
7. TYPES OF APOPTOSIS
PHYSIOLOGICAL APOPTOSIS
The role of apoptosis in normal physiology is as
significant as that of its counterpart, mitosis.
PATHOLOGICAL APOPTOSIS
Abnormalities in cell death regulation can be a
significant component of diseases
8. PHYSIOLOGICAL APOPTOSIS
Developmental processes
To get rid of the body of pathogen-invaded cells and is a vital component of
wound healing - the removal of inflammatory cells and the evolution of
granulation tissue into scar tissue.
Dysregulation of apoptosis during wound healing can lead to pathologic forms of
healing such as excessive scarring and fibrosis.
Apoptosis is also needed to eliminate activated or auto-aggressive immune cells
either during maturation.
Apoptosis is central to remodeling in the adult, such as the follicular atresia of the
postovulatory follicle and post-weaning mammary gland involution.
Age induced apoptosis- oxidate stress
9. PATHOLOGICAL APOPTOSIS
Damage to host cell DNA e.g. in therapy for cancer by
irradiation or by chemotherapy, mild thermal injury or hypoxia
Accumulation of misfolded proteins formed by free radical
injury or from mutations e.g. in degenerative diseases of CNS
e.g.Alzheimer’s disease, Parkinson’s disease, chronic infective
dementias.
Certain viral infections e.g. councilman bodies in viral hepatitis,
progressive depletion of CD4+T cells in HIV infection.
Cell death by cytotoxic Tcells in transplant rejection reaction.
Pathologic atrophy of organs and tissues on withdrawal of
stimuli e.g. prostatic atrophy after orchiectomy, atrophy of
kidney or salivary gland on obstruction of ureter or ducts
respectively.
10. FACTORS
?
CELL
INJURY
? ? ? ? ?
NECROSIS APOPTOSIS
• INTRACELLULAR FACTORS
• Availability of CASPASES
• ATP
• EXTRACELLULAR FACTORS
• Type of death signal
• Tissue type
• Developmental stage of tissue
• Duration and intensity of
stimulus
12. EXTRINSIC PATHWAY
• Apoptosis generally induced by two pathways
1. Extrinsic pathway
2. Intrinsic pathway
• All this pathways converge onto common pathway
• These pathways involve the action of the cysteine proteases called
Caspases that cleaves there target proteins after an aspartic acid
residue.
13. • The extrinsic pathway is triggered
by the binding of ligands to the
transmembrane death receptors,
such as tumour necrosis factor
receptor 1 (TNFR1), and Fas
receptor (FasR).
• The ligand binding causes
clustering of the cytoplasmic
domains of these receptors, which,
in turn, recruits adapter proteins
containing corresponding death
domains
14. • The death domains of these
adapter proteins serve as a binding
site for different upstream (initiator)
procaspases (such as caspase-8 and
caspase-10) to form a death-
inducing signaling complex (DISC),
which activates these caspases
• The activated upstream caspases
then activate downstream
(executioner) caspases (such as
caspase-3, caspase-6, and caspase-
7) to execute the cell death.
15. • A prominent feature of apoptosis is the absence of
systemic or localised damage to other cells owing to
lack of inflammation during its initiation, completion,
and the clearance of the dead cells.
• The apoptotic cell achieves this by carefully wrapping
the cell membrane around the new fragmented cell,
forming apoptotic bodies.
16. • Nucleotides such as adenosine 5′-
triphosphate (ATP) and uridine-5′-
triphosphate (UTP), which are
released by the apoptotic cell,
serve as the ‘find-me' signal for
macrophages.
• Once a macrophage gain sufficient
proximity, the apoptotic bodies
enable the former to engulf them
by displaying phosphatidyl serine
(the ‘eat-me signal’) on their
surface
17. INTRINSIC PATHWAY
• The intrinsic pathway, also called the
mitochondrial pathway, involves the release
of cytochrome c from the mitochondria to
the cytoplasm in response to cellular stress.
• The cytochrome c, in association with
apoptotic protease-activating factor-1 (Apaf-
1), forms an apoptosome. Within
apoptosome, procaspase-9 is activated to
become caspase-9. Caspase-9, in turn,
activates downstream effector caspases
18. • The mitochondria further release
proapoptotic proteins such as
apoptosis-inducing factor (AIF) and
endonuclease G.
• AIF translocates to the nucleus and
facilitates DNA fragmentation and
chromatin condensation. After this,
‘stage I’ chromatin condensation (also
called ring condensation) ensues the
translocation of endonuclease G to the
nucleus leading to further
fragmentation of the DNA.
• Finally, the caspase-activated DNase
(CAD) is translocated to the nucleus,
leading to ‘stage II condensation’ (the
necklace condensation)
19. REGULATORS OF INTRINSIC PATHWAY
(MITOCHONDRIA)
• The mitochondrial phase of apoptosis is regulated by the Bcl-2 family of
proteins.
• The proapoptotic proteins of this family, such as BAX and BAK, create pores
on the mitochondrial membrane in response to apoptotic stimuli, facilitating
the release of cytochrome c.
• Meanwhile, other proapoptotic proteins, such as BAD, BIM, BID, Puma, Noxa,
keep the anti-apoptotic protein, Bcl-2, inactive. The released cytochrome c,
through its interaction with Apaf-1, activates caspase-9. Meanwhile, the
mitochondria release a second molecule, aptly named, second mitochondria-
derived activator of caspase (SMAC) that inhibits IAP (for inhibitor of
apoptosis) proteins preventing the latter from deactivating caspase-9.
Caspase-9, thus fully enabled, carries out the cell death by activating
21. MORPHOLOGY OF APOPTOSIS
• LIGHT MICROSCOPE
I. CELL SHRINKAGE
II. CHROMATIN CONDENSATION
• Aapoptotic cell -round or oval mass
with dark eosinophilic cytoplasm and
dense purple nuclear chromatin
fragments
22. • Apoptotic thymic lymphocytes The
arrow indicates a fragmented
section of a nucleus and the
arrowhead most likely indicates an
apoptotic body that seems to
contain predominantly cytoplasm
Macrophage with engulfed
intracytoplasmic apoptotic bodies.
This macrophage is also called a
“tingible body macrophage.”
23. NECROSIS
• Toxic
• Energy independent
• Uncontrolled
• Affects large group of cells
• cell swelling
• pyknosis, karyorrhexis,
karyolysis
• disrupted cell membrane
• cytoplasm released
• inflammation usually present
• homeostatis/ physiological
• energy dependent
• controlled
• affects individual / cluster of
cells
• cell shrinkage
• pyknosis, karyorrhexis
• intact cell membrane
• cytoplasm retained in
apoptotic bodies
APOPTOSIS
NECROSIS VS APOPTOSIS
24. ASSAYS OF APOPTOSIS
1. Cytomorphological alterations
2. DNA fragmentation
3. Detection of Caspases, cleaved substrates, regulators
and inhibitors
4. Membrane alterations
5. Detection of apoptosis in whole mounts
6. Mitochondrial assays
25. • TECHNIQUES TO IDENTIFY APOPTOTIC CELLS
• 1.Staining of condensed chromatin by haematoxylin, Feulgen stain.
• 2.DNA changes detected by in situ techniques or by gel electrophoresis.
• 3.Immunohistochemical stains with antibody specific for caspase 3 antibody.
• 4.Fluorescent staining with annexin V to locate phosphatidylserine on the outer
surface of the cell membrane in apoptosis.
• 5.Fluorochrome-based TUNEL(terminal deoxynucleotidyl transferase dUTP end-
labelling) assay by flow cytometry for detecting DNA breakages.
26. VARIANTS OF PROGRAMMED CELL DEATH
• NECROPTOSIS:- This form of cell death is a hybrid that shares aspects of both
necrosis and apoptosis.
• Morphologically, and to some extent biochemically, it resemble necrosis, as both
are characterised by loss of ATP, swelling of the cell and organelles, generation of
reactive oxygen species(ROS), release of lysosomal enzymes, and ultimately rupture
of the plasma membrane.
• Mechanistically, it is triggered by signal transduction pathways that culminate in
cell death, a feature similar to apoptosis.
• It is a ‘’caspase –independent’’ programmed cell death.
• E.g.Physiological necroptosis-occurs during formation of mammalian bone growth
plate.
• Pathologically- steatohepatitis, acute pancreatitis, ischemia-reperfusion injury, viral
27. • PYROPTOSIS:- is a form of apoptosis that is accompanied by the release of the
fever-inducing cytokine IL-1
• Microbial products that enter infected cells are recognized by cytoplasmic innate
immune receptors and can activate the multiprotein complex called the
inflammasome, to activate caspase-1, which cleaves a precursor form of IL-1 and
releases its biologically active form.
• Pyroptosis differs from classic apoptosis in having
• 1. Cellular swelling
• 2. Damage to plasma membrane
• 3. By release of fever-producing cytokine IL-1
28. • FERROPTOSIS:- Ferroptosis is cell death triggered by iron-
dependent accumulation of reactive oxygen species in the
cell.
• The peroxidation of lipids disrupts many aspects of membrane
function, including fluidity, lipid-protein interactions, ion and
nutrient transport, and signaling pathways.
• The overall effect is the loss of membrane permeability, which
leads to cell death resembling necrosis but is regulated by
specific signals (unlike necrosis) and can be prevented by
reducing iron levels
• E.g. cancers
• neurodegenerative diseases
• stroke
29. CLINICAL APPLICATIONS
• 1. Conditions with defective apoptosis and increased cell survival
Mutation of TP53 is most common in various human cancers like cancers of the
lung, head and neck, colon and breast
Autoimmune diseases, immunodeficiencies, lymphoid malignancies.
2.conditions with exaggerated apoptosis and higher cell death
In Acute myocardial infarction in which there is 20% necrosis and 80% apoptosis
of infarcted myocardium
In Neurodegenerative diseases (e.g.Alzheimer’s disease, parkinson’s disease),
misfolded proteins and mutations cause increased apoptosis
Hematological diseases such as myelodysplastic syndromes, aplastic anemia,
severe beta thalassaemia
30. REFERENCES
• 1. Kumar,v.,Abbas,A.K.,Aster,J.Cand Perkins, J.A.Robbins & cotran,
Pathologic basis of disease. 10th ed; South Asia: Elsevier2021;1:42-48.
• 2. Bhardwaj,J.R.,Deb,P.BOYD’s Textbook of Pathology.10thed;Wolters Kluwer
health 2013;1:44-48.
• 3. Linder,J.,Damjanov,I.,Anderson’s Pathology.10thed;South Asia:Elsevier
2014;1:372-373.
• 4. Elmore S. Apoptosis: a review of programmed cell death. Toxicol Pathol.
2007 Jun;35(4):495-516.
• 5. Kam, P.C.A. and Ferch, N.I. (2000), Apoptosis: mechanisms and clinical
implications. Anaesthesia, 55:1081-1093.
• 6. Mohan,H., Textbook of Pathology; 8th ed; Jaypee Brothers Med.
Publishers; 2019;57-60.
Editor's Notes
Members of the TNF receptor family share similar cyteine-rich extracellular domains and have a cytoplasmic domain of about 80 amino acids called the “death domain” (Ashkenazi and Dixit, 1998). This death domain plays a critical role in transmitting the death signal from the cell surface to the intracellular signaling pathways
The find-me signals (such as low levels of nucleotides ATP and UTP, fractalkine, lysophosphatidylcholine, or sphingosine 1-phosphate) released by apoptotic cells help attract motile phagocytes to the proximity of the cell undergoing apoptosis. The phagocytes then use engulfment receptors on their surface to engage eat-me signals on apoptotic cells. For clarity, only the PtdSer on the apoptotic cells engaged by cognate receptors is depicted. Engagement of the engulfment receptors (linked to PtdSer recognition) has been shown to stimulate release of antiinflammatory cytokines such as TGF-β, IL-10, and prostaglandin E2 (PGE2). The intracellular signaling induced within the phagocyte by the ligand–receptor interactions leads to cytoskeletal rearrangements and internalization of the dying cell. The phagocyte processes the engulfed corpse through a series of steps, and proper digestion seems to be important for continued uptake of other dying cells by phagocytes.
With cell shrinkage, the cells are smaller in size, the cytoplasm is dense and the organelles are more tightly packed. Pyknosis is the result of chromatin condensation and this is the most characteristic feature of apoptosis.