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Ribosome inactivating proteins and apoptosis
Sriram Narayanan1, Kalpana Surendranath, Namrata Bora
1Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India.
FEBS Letters
|March 1, 2005
Summary
Ribosome inactivating proteins (RIPs) are toxins that halt protein synthesis and induce apoptosis. This review explores RIP-induced cell death mechanisms, highlighting mitochondria's central role in integrating cellular stress and apoptosis.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Ribosome inactivating proteins (RIPs) are toxins from plants or microbes that inhibit protein synthesis by inactivating ribosomes.
- Emerging evidence indicates RIPs can also induce programmed cell death (apoptosis).
- The precise mechanisms underlying RIP-induced apoptosis remain incompletely understood.
Purpose of the Study:
- To compare diverse apoptotic pathways implicated in RIP-induced cell death.
- To propose a generalized mechanistic pathway for RIP-mediated apoptosis.
- To elucidate the role of mitochondria in RIP-induced cellular events.
Main Methods:
- Comparative analysis of existing literature on RIPs and apoptosis.
- Review of studies investigating cellular events following RIP exposure.
- Examination of mitochondrial involvement in stress response and cell death pathways.
Main Results:
- Mitochondria appear to play a crucial, integrative role in RIP-induced cellular stress and apoptosis.
- Various RIPs may converge on common mitochondrial-mediated apoptotic pathways.
- Specific cellular events and signaling cascades are modulated by RIPs.
Conclusions:
- RIP-induced cell death involves complex apoptotic pathways.
- Mitochondria are likely central integrators of stress signals leading to apoptosis.
- A generalized pathway for RIP-induced apoptosis can be proposed, emphasizing mitochondrial function.