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Cleavage of poly(ADP-ribose) polymerase: a sensitive parameter to study cell death
1Hospital Research Center for University Laval, CHUL Research Center of CHUQ, Québec, QC, Canada.
Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|January 1, 1997
Summary
Proteases cleave proteins during programmed cell death (apoptosis). Studying Poly(ADP-ribose) polymerase (PARP) cleavage reveals distinct patterns that identify different cell death types and activate specific proteases.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Proteases are key enzymes in programmed cell death (apoptosis).
- Poly(ADP-ribose) polymerase (PARP) is an early target cleaved during apoptosis.
- Understanding PARP cleavage aids in elucidating caspase roles in cell death.
Purpose of the Study:
- To review the activation of proteases for specific protein cleavage during cell death.
- To highlight the role of Poly(ADP-ribose) polymerase (PARP) cleavage in identifying cell death types.
- To discuss the biological functions of early PARP cleavage in apoptosis.
Main Methods:
- Review of literature on protease activation and protein cleavage during apoptosis.
- Analysis of Poly(ADP-ribose) polymerase (PARP) cleavage patterns in different cell death models.
- Characterization of PARP fragments in necrotic and apoptotic cells.
Main Results:
- Poly(ADP-ribose) polymerase (PARP) cleavage produces a signature 89-kDa fragment during apoptosis.
- Distinct PARP fragments are observed in necrotic and apoptotic cells, indicating alternative cleavage sites.
- These variations suggest the involvement of caspases or other death proteases.
Conclusions:
- PARP cleavage detection serves as a sensitive marker for identifying different cell death modalities.
- Characterization of PARP fragments can indicate the activation of specific death proteases.
- Early PARP cleavage has putative biological functions in the apoptotic process.