- •Contents
- •Contributors
- •Part I General Principles of Cell Death
- •1 Human Caspases – Apoptosis and Inflammation Signaling Proteases
- •1.1. Apoptosis and limited proteolysis
- •1.2. Caspase evolution
- •2. ACTIVATION MECHANISMS
- •2.2. The activation platforms
- •2.4. Proteolytic maturation
- •3. CASPASE SUBSTRATES
- •4. REGULATION BY NATURAL INHIBITORS
- •REFERENCES
- •2 Inhibitor of Apoptosis Proteins
- •2. CELLULAR FUNCTIONS AND PHENOTYPES OF IAP
- •3. IN VIVO FUNCTIONS OF IAP FAMILY PROTEINS
- •4. SUBCELLULAR LOCATIONS OF IAP
- •8. IAP–IAP INTERACTIONS
- •10. ENDOGENOUS ANTAGONISTS OF IAP
- •11. IAPs AND DISEASE
- •SUGGESTED READINGS
- •1. INTRODUCTION
- •2.1. The CD95 (Fas/APO-1) system
- •2.1.1. CD95 and CD95L: discovery of the first direct apoptosis-inducing receptor-ligand system
- •2.1.2. Biochemistry of CD95 apoptosis signaling
- •2.2. The TRAIL (Apo2L) system
- •3.1. The TNF system
- •3.1.1. Biochemistry of TNF signal transduction
- •3.1.2. TNF and TNF blockers in the clinic
- •3.2. The DR3 system
- •4. THE DR6 SYSTEM
- •6. CONCLUDING REMARKS AND OUTLOOK
- •SUGGESTED READINGS
- •4 Mitochondria and Cell Death
- •1. INTRODUCTION
- •2. MITOCHONDRIAL PHYSIOLOGY
- •3. THE MITOCHONDRIAL PATHWAY OF APOPTOSIS
- •9. CONCLUSIONS
- •SUGGESTED READINGS
- •1. INTRODUCTION
- •3. INHIBITING APOPTOSIS
- •4. INHIBITING THE INHIBITORS
- •6. THE BCL-2 FAMILY AND CANCER
- •SUGGESTED READINGS
- •6 Endoplasmic Reticulum Stress Response in Cell Death and Cell Survival
- •1. INTRODUCTION
- •2. THE ESR IN YEAST
- •3. THE ESR IN MAMMALS
- •4. THE ESR AND CELL DEATH
- •5. THE ESR IN DEVELOPMENT AND TISSUE HOMEOSTASIS
- •6. THE ESR IN HUMAN DISEASE
- •7. CONCLUSION
- •7 Autophagy – The Liaison between the Lysosomal System and Cell Death
- •1. INTRODUCTION
- •2. AUTOPHAGY
- •2.2. Physiologic functions of autophagy
- •2.3. Autophagy and human pathology
- •3. AUTOPHAGY AND CELL DEATH
- •3.1. Autophagy as anti–cell death mechanism
- •3.2. Autophagy as a cell death mechanism
- •3.3. Molecular players of the autophagy–cell death cross-talk
- •4. AUTOPHAGY, CELLULAR DEATH, AND CANCER
- •5. CONCLUDING REMARKS AND PENDING QUESTIONS
- •SUGGESTED READINGS
- •8 Cell Death in Response to Genotoxic Stress and DNA Damage
- •1. TYPES OF DNA DAMAGE AND REPAIR SYSTEMS
- •2. DNA DAMAGE RESPONSE
- •2.2. Transducers
- •2.3. Effectors
- •4. CHROMATIN MODIFICATIONS
- •5. CELL CYCLE CHECKPOINT REGULATION
- •6. WHEN REPAIR FAILS: SENESCENCE VERSUS APOPTOSIS
- •6.1. DNA damage response and the induction of apoptosis
- •6.2. p53-independent mechanisms of apoptosis
- •6.3. DNA damage response and senescence induction
- •7. DNA DAMAGE FROM OXIDATIVE STRESS
- •SUGGESTED READINGS
- •9 Ceramide and Lipid Mediators in Apoptosis
- •1. INTRODUCTION
- •3.1. Basic cell signaling often involves small molecules
- •3.2. Sphingolipids are cell-signaling molecules
- •3.2.1. Ceramide induces apoptosis
- •3.2.2. Ceramide accumulates during programmed cell death
- •3.2.3. Inhibition of ceramide production alters cell death signaling
- •4.1. Ceramide is generated through SM hydrolysis
- •4.3. aSMase can be activated independently of extracellular receptors to regulate apoptosis
- •4.4. Controversial aspects of the role of aSMase in apoptosis
- •4.5. De novo ceramide synthesis regulates programmed cell death
- •4.6. p53 and Bcl-2–like proteins are connected to de novo ceramide synthesis
- •4.7. The role and regulation of de novo synthesis in ceramide-mediated cell death is poorly understood
- •5. CONCLUDING REMARKS AND FUTURE DIRECTIONS
- •5.1. Who? (Which enzyme?)
- •5.2. What? (Which ceramide?)
- •5.3. Where? (Which compartment?)
- •5.4. When? (At what steps?)
- •5.5. How? (Through what mechanisms?)
- •5.6. What purpose?
- •6. SUMMARY
- •SUGGESTED READINGS
- •1. General Introduction
- •1.1. Cytotoxic lymphocytes and apoptosis
- •2. CYTOTOXIC GRANULES AND GRANULE EXOCYTOSIS
- •2.1. Synthesis and loading of the cytotoxic granule proteins into the secretory granules
- •2.2. The immunological synapse
- •2.3. Secretion of granule proteins
- •2.4. Uptake of proapoptotic proteins into the target cell
- •2.5. Activation of death pathways by granzymes
- •3. GRANULE-BOUND CYTOTOXIC PROTEINS
- •3.1. Perforin
- •3.2. Granulysin
- •3.3. Granzymes
- •3.3.1. GrB-mediated apoptosis
- •3.3.2. GrA-mediated cell death
- •3.3.3. Orphan granzyme-mediated cell death
- •5. CONCLUSIONS
- •REFERENCES
- •Part II Cell Death in Tissues and Organs
- •1.1. Death by trophic factor deprivation
- •1.2. Key molecules regulating neuronal apoptosis during development
- •1.2.1. Roles of caspases and Apaf-1 in neuronal cell death
- •1.2.2. Role of Bcl-2 family members in neuronal cell death
- •1.3. Signal transduction from neurotrophins and neurotrophin receptors
- •1.3.1. Signals for survival
- •1.3.2. Signals for death
- •2.1. Apoptosis in neurodegenerative diseases
- •2.1.4. Amyotrophic lateral sclerosis
- •2.2. Necrotic cell death in neurodegenerative diseases
- •2.2.1. Calpains
- •2.2.2. Cathepsins
- •3. CONCLUSIONS
- •ACKNOWLEDGMENT
- •SUGGESTED READINGS
- •ACKNOWLEDGMENT
- •SUGGESTED READINGS
- •1. INTRODUCTION
- •5. S-NITROSYLATION OF PARKIN
- •7. POTENTIAL TREATMENT OF EXCESSIVE NMDA-INDUCED Ca2+ INFLUX AND FREE RADICAL GENERATION
- •8. FUTURE THERAPEUTICS: NITROMEMANTINES
- •9. CONCLUSIONS
- •Acknowledgments
- •SUGGESTED READINGS
- •3. MITOCHONDRIAL PERMEABILITY TRANSITION ACTIVATED BY Ca2+ AND OXIDATIVE STRESS
- •4.1. Mitochondrial apoptotic pathways
- •4.2. Bcl-2 family proteins
- •4.3. Caspase-dependent apoptosis
- •4.4. Caspase-independent apoptosis
- •4.5. Calpains in ischemic neural cell death
- •5. SUMMARY
- •ACKNOWLEDGMENTS
- •SUGGESTED READINGS
- •1. INTRODUCTION
- •2. HISTORICAL ANTECEDENTS
- •7.1. Activation of p21 waf1/cip1: Targeting extrinsic and intrinsic pathways to death
- •8. CONCLUSION
- •ACKNOWLEDGMENTS
- •REFERENCES
- •16 Apoptosis and Homeostasis in the Eye
- •1.1. Lens
- •1.2. Retina
- •2. ROLE OF APOPTOSIS IN DISEASES OF THE EYE
- •2.1. Glaucoma
- •2.2. Age-related macular degeneration
- •4. APOPTOSIS AND OCULAR IMMUNE PRIVILEGE
- •5. CONCLUSIONS
- •SUGGESTED READINGS
- •17 Cell Death in the Inner Ear
- •3. THE COCHLEA IS THE HEARING ORGAN
- •3.1. Ototoxic hair cell death
- •3.2. Aminoglycoside-induced hair cell death
- •3.3. Cisplatin-induced hair cell death
- •3.4. Therapeutic strategies to prevent hair cell death
- •3.5. Challenges to studies of hair cell death
- •4. SPIRAL GANGLION NEURON DEATH
- •4.1. Neurotrophic support from sensory hair cells and supporting cells
- •4.2. Afferent activity from hair cells
- •4.3. Molecular manifestations of spiral ganglion neuron death
- •4.4. Therapeutic interventions to prevent SGN death
- •ACKNOWLEDGMENTS
- •SUGGESTED READINGS
- •18 Cell Death in the Olfactory System
- •1. Introduction
- •2. Anatomical Aspects
- •3. Life and Death in the Olfactory System
- •3.1. Olfactory epithelium
- •3.2. Olfactory bulb
- •REFERENCES
- •1. Introduction
- •3.1. Beta cell death in the development of T1D
- •3.2. Mechanisms of beta cell death in type 1 diabetes
- •3.2.1. Apoptosis signaling pathways downstream of death receptors and inflammatory cytokines
- •3.2.2. Oxidative stress
- •3.3. Mechanisms of beta cell death in type 2 diabetes
- •3.3.1. Glucolipitoxicity
- •3.3.2. Endoplasmic reticulum stress
- •5. SUMMARY
- •Acknowledgments
- •REFERENCES
- •20 Apoptosis in the Physiology and Diseases of the Respiratory Tract
- •1. APOPTOSIS IN LUNG DEVELOPMENT
- •2. APOPTOSIS IN LUNG PATHOPHYSIOLOGY
- •2.1. Apoptosis in pulmonary inflammation
- •2.2. Apoptosis in acute lung injury
- •2.3. Apoptosis in chronic obstructive pulmonary disease
- •2.4. Apoptosis in interstitial lung diseases
- •2.5. Apoptosis in pulmonary arterial hypertension
- •2.6. Apoptosis in lung cancer
- •SUGGESTED READINGS
- •21 Regulation of Cell Death in the Gastrointestinal Tract
- •1. INTRODUCTION
- •2. ESOPHAGUS
- •3. STOMACH
- •4. SMALL AND LARGE INTESTINE
- •5. LIVER
- •6. PANCREAS
- •7. SUMMARY AND CONCLUDING REMARKS
- •SUGGESTED READINGS
- •22 Apoptosis in the Kidney
- •1. NORMAL KIDNEY STRUCTURE AND FUNCTION
- •3. APOPTOSIS IN ADULT KIDNEY DISEASE
- •4. REGULATION OF APOPTOSIS IN KIDNEY CELLS
- •4.1. Survival factors
- •4.2. Lethal factors
- •4.2.1. TNF superfamily cytokines
- •4.2.2. Other cytokines
- •4.2.3. Glucose
- •4.2.4. Drugs and xenobiotics
- •4.2.5. Ischemia-reperfusion and sepsis
- •5. THERAPEUTIC APPROACHES
- •SUGGESTED READINGS
- •1. INTRODUCTION
- •2. APOPTOSIS IN THE NORMAL BREAST
- •2.1. Occurrence and role of apoptosis in the developing breast
- •2.2.2. Death ligands and death receptor pathway
- •2.2.4. LIF-STAT3 proapoptotic signaling
- •2.2.5. IGF survival signaling
- •2.2.6. Regulation by adhesion
- •2.2.7. PI3K/AKT pathway: molecular hub for survival signals
- •2.2.8. Downstream regulators of apoptosis: the BCL-2 family members
- •3. APOPTOSIS IN BREAST CANCER
- •3.1. Apoptosis in breast tumorigenesis and cancer progression
- •3.2. Molecular dysregulation of apoptosis in breast cancer
- •3.2.1. Altered expression of death ligands and their receptors in breast cancer
- •3.2.2. Deregulation of prosurvival growth factors and their receptors
- •3.2.3. Alterations in cell adhesion and resistance to anoikis
- •3.2.4. Enhanced activation of the PI3K/AKT pathway in breast cancer
- •3.2.5. p53 inactivation in breast cancer
- •3.2.6. Altered expression of BCL-2 family of proteins in breast cancer
- •5. CONCLUSION
- •SUGGESTED READINGS
- •1. INTRODUCTION
- •2. DETECTING CELL DEATH IN THE FEMALE GONADS
- •4. APOPTOSIS AND FEMALE REPRODUCTIVE AGING
- •6. CONCLUDING REMARKS
- •REFERENCES
- •25 Apoptotic Signaling in Male Germ Cells
- •1. INTRODUCTION
- •3.1. Murine models
- •3.2. Primate models
- •3.3. Pathways of caspase activation and apoptosis
- •3.4. Apoptotic signaling in male germ cells
- •5. P38 MITOGEN-ACTIVATED PROTEIN KINASE (MAPK) AND NITRIC OXIDE (NO)–MEDIATED INTRINSIC PATHWAY SIGNALING CONSTITUTES A CRITICAL COMPONENT OF APOPTOTIC SIGNALING IN MALE GERM CELLS AFTER HORMONE DEPRIVATION
- •11. CONCLUSIONS AND PERSPECTIVES
- •REFERENCES
- •26 Cell Death in the Cardiovascular System
- •1. INTRODUCTION
- •2. CELL DEATH IN THE VASCULATURE
- •2.1. Apoptosis in the developing blood vessels
- •2.2. Apoptosis in atherosclerosis
- •2.2.1. Vascular smooth muscle cells
- •2.2.2. Macrophages
- •2.2.3. Regulation of apoptosis in atherosclerosis
- •2.2.4. Necrosis and autophagy in atherosclerosis
- •3. CELL DEATH IN THE MYOCARDIUM
- •3.1. Cell death in myocardial infarction
- •3.1.1. Apoptosis in myocardial infarction
- •3.1.2. Necrosis in myocardial infarction
- •3.1.3. Autophagy in myocardial infarction
- •3.2. Cell death in heart failure
- •3.2.1. Apoptosis in heart failure
- •3.2.2. Necrosis in heart failure
- •3.2.3. Autophagy in heart failure
- •4. CONCLUDING REMARKS
- •ACKNOWLEDGMENTS
- •REFERENCES
- •27 Cell Death Regulation in Muscle
- •1. INTRODUCTION TO MUSCLE
- •1.1. Skeletal muscle adaptation to endurance training
- •1.2. Myonuclear domains
- •2. MITOCHONDRIALLY MEDIATED APOPTOSIS IN MUSCLE
- •2.1. Skeletal muscle apoptotic susceptibility
- •4. APOPTOSIS IN MUSCLE DURING AGING AND DISEASE
- •4.1. Aging
- •4.2. Type 2 diabetes mellitus
- •4.3. Cancer cachexia
- •4.4. Chronic heart failure
- •6. CONCLUSION
- •SUGGESTED READINGS
- •28 Cell Death in the Skin
- •1. INTRODUCTION
- •2. CELL DEATH IN SKIN HOMEOSTASIS
- •2.1. Cornification and apoptosis
- •2.2. Death receptors in the skin
- •3. CELL DEATH IN SKIN PATHOLOGY
- •3.1. Sunburn
- •3.2. Skin cancer
- •3.3. Necrolysis
- •3.4. Pemphigus
- •3.5. Eczema
- •3.6. Graft-versus-host disease
- •4. CONCLUDING REMARKS AND PERSPECTIVES
- •ACKNOWLEDGMENTS
- •SUGGESTED READINGS
- •29 Apoptosis and Cell Survival in the Immune System
- •2.1. Survival of early hematopoietic progenitors
- •2.2. Sizing of the T-cell population
- •2.2.1. Establishing central tolerance
- •2.2.2. Peripheral tolerance
- •2.2.3. Memory T cells
- •2.3. Control of apoptosis in B-cell development
- •2.3.1. Early B-cell development
- •2.3.2. Deletion of autoreactive B cells
- •2.3.3. Survival and death of activated B cells
- •3. IMPAIRED APOPTOSIS AND LEUKEMOGENESIS
- •4. CONCLUSIONS
- •ACKNOWLEDGMENTS
- •REFERENCES
- •30 Cell Death Regulation in the Hematopoietic System
- •1. INTRODUCTION
- •2. HEMATOPOIETIC STEM CELLS
- •4. ERYTHROPOIESIS
- •5. MEGAKARYOPOIESIS
- •6. GRANULOPOIESIS
- •7. MONOPOIESIS
- •8. CONCLUSION
- •ACKNOWLEDGMENTS
- •REFERENCES
- •31 Apoptotic Cell Death in Sepsis
- •1. INTRODUCTION
- •2. HOST INFLAMMATORY RESPONSE TO SEPSIS
- •3. CLINICAL OBSERVATIONS OF CELL DEATH IN SEPSIS
- •3.1. Sepsis-induced apoptosis
- •3.2. Necrotic cell death in sepsis
- •4.1. Central role of apoptosis in sepsis mortality: immune effector cells and gut epithelium
- •4.2. Apoptotic pathways in sepsis-induced immune cell death
- •4.3. Investigations implicating the extrinsic apoptotic pathway in sepsis
- •4.4. Investigations implicating the intrinsic apoptotic pathway in sepsis
- •5. THE EFFECT OF APOPTOSIS ON THE IMMUNE SYSTEM
- •5.1. Cellular effects of an increased apoptotic burdens
- •5.2. Network effects of selective loss of immune cell types
- •5.3. Studies of immunomodulation by apoptotic cells in other fields
- •7. CONCLUSION
- •REFERENCES
- •32 Host–Pathogen Interactions
- •1. INTRODUCTION
- •2. FROM THE PATHOGEN PERSPECTIVE
- •2.1. Commensals versus pathogens
- •2.2. Pathogen strategies to infect the host
- •3. HOST DEFENSE
- •3.1. Antimicrobial peptides
- •3.2. PRRs and inflammation
- •3.2.1. TLRs
- •3.2.2. NLRs
- •3.2.3. The Nod signalosome
- •3.2.4. The inflammasome
- •3.3. Cell death
- •3.3.1. Apoptosis and pathogen clearance
- •3.3.2. Pyroptosis
- •3.2.3. Caspase-independent cell death
- •3.2.4. Autophagy and autophagic cell death
- •4. CONCLUSIONS
- •REFERENCES
- •Part III Cell Death in Nonmammalian Organisms
- •1. PHENOTYPE AND ASSAYS OF YEAST APOPTOSIS
- •2.1. Pheromone-induced cell death
- •2.1.1. Colony growth
- •2.1.2. Killer-induced cell death
- •3. EXTERNAL STIMULI THAT INDUCE APOPTOSIS IN YEAST
- •4. THE GENETICS OF YEAST APOPTOSIS
- •5. PROGRAMMED AND ALTRUISTIC AGING
- •SUGGESTED READINGS
- •34 Caenorhabditis elegans and Apoptosis
- •1. Overview
- •2. KILLING
- •3. SPECIFICATION
- •4. EXECUTION
- •4.1. DNA degradation
- •4.2. Mitochondrial elimination
- •4.3. Engulfment
- •5. SUMMARY
- •SUGGESTED READINGS
- •35 Apoptotic Cell Death in Drosophila
- •2. DROSOPHILA CASPASES AND PROXIMAL REGULATORS
- •6. CLOSING COMMENTS
- •SUGGESTED READINGS
- •36 Analysis of Cell Death in Zebrafish
- •1. INTRODUCTION
- •2. WHY USE ZEBRAFISH TO STUDY CELL DEATH?
- •2.2. Molecular techniques to rapidly assess gene function in embryos
- •2.2.1. Studies of gene function using microinjections into early embryos
- •2.2.2. In situ hybridization and immunohistochemistry
- •2.3. Forward genetic screening
- •2.4. Drug and small-molecule screening
- •2.5. Transgenesis
- •2.6. Targeted knockouts
- •3.1. Intrinsic apoptosis
- •3.2. Extrinsic apoptosis
- •3.3. Chk-1 suppressed apoptosis
- •3.4. Anoikis
- •3.5. Autophagy
- •3.6. Necrosis
- •4. DEVELOPMENTAL CELL DEATH IN ZEBRAFISH EMBRYOS
- •5. THE P53 PATHWAY
- •6. PERSPECTIVES AND FUTURE DIRECTIONS
- •SUGGESTED READING
CAENORHABDITIS ELEGANS AND APOPTOSIS |
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externalization in apoptotic cells, in addition to its role in promoting apoptotic DNA degradation. WAH- 1 appears to accomplish this by binding the phospholipid scramblase SCRM-1 and activating its bidirectional lipid scramblase activity, leading to the exposure of PS on the cell surface. Surface-exposed PS not only results in engulfment of apoptotic cells by phagocytes, but can also lead to engulfment of living cells that ectopically expose PS. This occurs in worms lacking the aminophospholipid translocase TAT-1 that maintains PS asymmetry. The engulfment of living cells by phagocytes in the tat-1 mutant can be blocked by loss-of-function mutations in psr-1 or ced-1, two putative engulfment receptors, suggesting that externalized PS can serve as “eatme” signals for both engulfment pathways.
Phagocytosis not only removes cell corpses generated by PCD, but also actively promotes apoptosis. The mechanism by which this occurs is unknown and will be a topic of future study. The two engulfment pathways previously described are also important for the removal of necrotic cell corpses. The engulfment of apoptotic corpses is distinct from other forms of phagocytosis, such as antibodyor complement-mediated uptake of pathogens by mammalian immune cells, but this process seems highly conserved from C. elegans to humans.
Several other genes have also been implicated in cell death execution, including ced-8, which appears to control the timing of cell death and encodes a protein similar to human XK, a putative membrane transport protein.
5. SUMMARY
C. elegans has been a model organism for investigation of basic mechanisms of apoptosis. Its small size, transparent body, invariant cell lineage, and rapid reproductive rate make it particularly useful for experimental inquiry after genetic manipulation. Although the killing pathway comprising egl-1, ced-9, ced-4, and ced-3 seems to be responsible for most somatic cell death events, regulation of egl-1 transcription has been defined in only a handful of the 131 somatic cells that invariantly die during C. elegans development. In some cases, such as the tail-spike cell and CEMs, egl-1 transcription does not seem to be a mandatory event for apoptosis. The mitochondrion appears to be a critical site for cell death regulation, as the CED-4/CED-9 complex localizes to mitochondria, and EGL-1 induces release of CED-4 from mitochondria and ultimately autoactivation of CED-3. Moreover, two mitochondrial factors, WAH-1 and CPS- 6, are released from mitochondria during apoptosis to promote DNA degradation and PS externalization, two
important cell death execution events. The CED-3 caspase likely activates multiple cell death execution pathways, including two pathways that are responsible for cleaving internucleosomal DNA and two pathways for mitochondria elimination. Finally, engulfing cells use two partially redundant pathways to uptake and digest apoptotic cells.
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