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The autophagosomal-lysosomal compartment in programmed cell death.
1Institut für Krebsforschung der Universität Wien, Borschkegasse 8a, A-1090 Wien, Austria. wilfried.bursch@univie.ac.at
Cell Death and Differentiation
|September 6, 2001
Summary
Programmed cell death (PCD) involves more than apoptosis; autophagy-prominent PCD is an ancient pathway. These distinct cell death mechanisms show flexibility in response to environmental changes.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Apoptosis mechanisms are well-understood, but evidence points to diverse programmed cell death (PCD) pathways.
- Autophagy-prominent PCD (Type II) is an evolutionarily conserved process observed in various physiological and pathological conditions.
Purpose of the Study:
- To review morphological, functional, and molecular data on the role of the autophagosomal-lysosomal compartment in PCD.
- To explore the interplay between autophagic and apoptotic cell death pathways.
Main Methods:
- Literature review of morphological studies on cell death.
- Analysis of functional data related to cell self-destruction pathways.
- Biochemical and molecular investigation of programmed cell death mechanisms.
Main Results:
- Programmed cell death encompasses pathways beyond apoptosis, including autophagy-prominent Type II cell death.
- Autophagic and apoptotic PCD are not mutually exclusive and demonstrate cellular flexibility.
- Lysosomal cysteine proteases (cathepsins) may mediate signals to caspases, linking diverse stimuli to apoptosis.
Conclusions:
- The autophagosomal-lysosomal compartment plays a significant role in programmed cell death.
- Cells exhibit adaptable self-destruction strategies involving both autophagic and apoptotic pathways.
- Understanding these diverse PCD mechanisms is crucial for physiological and pathological contexts.