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The biology and pathology of programmed cell death (apoptosis)
T V Anilkumar1, C E Sarraf, M R Alison
1Department of Histopathology, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.
Abstract:
Apoptosis is a process by which cells die in a controlled and programmed manner in response to specific stimuli, often following extrinsic and intrinsic signals which ultimately cause the "switching on" of cell death regulatory genes. Condensation of chromatin and cytoplasm, fragmentation of the cell and formation of membrane-bound bodies containing intact organelles (apoptotic bodies), and phagocytosis of these bodies by resident cells are the major structural changes associated with apoptosis. Biochemically, activation of a nonlysosomal endonuclease is a cardinal feature of this mode of cell death. Several genes have been implicated in the execution of apoptosis. A signal transduction mechanism is suspected to regulate the phenomenon. Although apoptosis is widely considered as an adaptive response to physiological or near physiological stimuli, several noxious agents can initiate the reaction and thus it is often a toxicological response.
Insights
Apoptosis is programmed cell death, a controlled process involving specific gene activation and distinct structural changes. This cellular mechanism can be triggered by physiological stimuli or toxicological agents.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Apoptosis is a regulated cellular process crucial for development and tissue homeostasis.
- It involves specific signaling pathways and gene activation leading to cell death.
- Structural and biochemical hallmarks define this programmed cell death.
Purpose of the Study:
- To elucidate the key molecular and structural events in apoptosis.
- To understand the regulatory mechanisms governing programmed cell death.
- To explore the role of apoptosis in both physiological and toxicological contexts.
Main Methods:
- Analysis of cellular structural changes during apoptosis.
- Biochemical assays to identify key molecular players.
- Investigation of gene expression patterns related to cell death.
- Examination of signal transduction pathways involved.
Main Results:
- Apoptosis is characterized by chromatin condensation, cellular fragmentation into apoptotic bodies, and phagocytosis.
- Activation of a nonlysosomal endonuclease is a critical biochemical event.
- Specific genes and signal transduction mechanisms regulate the apoptotic process.
- Apoptosis can be initiated by both physiological signals and noxious agents.
Conclusions:
- Apoptosis is a fundamental biological process with defined molecular and structural features.
- It serves adaptive roles but can also be a response to cellular damage or toxicity.
- Further research into apoptosis pathways can inform therapeutic strategies.