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Regulation of translation initiation following stress
1Division of Basic Sciences, National Cancer Institute, National Institutes of Health, Building 37, Room 5CO9, Bethesda, Maryland, MD 20892, USA.
Abstract:
Recent studies suggest that genotoxic and non-genotoxic stresses appear to invoke translational checkpoints in order to inhibit protein synthesis. Depending on the stress and/or cell type, this downregulation of protein synthesis may either (i) protect against the deleterious effects of noxious agents and ensure the conservation of resources that are needed to survive under adverse conditions or (ii) activate apoptosis. In this article, we have reviewed several lines of evidence which support the notion that regulation of translation initiation is an important component of the cellular stress response. While the stress-induced post-translational regulation of translation initiation factors (eIFs) has been well documented, stress-induced regulation of eIFs at the mRNA levels, as reviewed here, is only beginning to be elucidated. Thus, the stress-mediated regulation of eIFs occurs at multiple different levels involving, transcriptional, post-transcriptional and post-translational controls.
Insights
Cellular stress inhibits protein synthesis via translational checkpoints. This response, involving translation initiation factors, can promote survival or trigger apoptosis, highlighting its critical role in stress adaptation.
Area of Science:
- Molecular Biology
- Cellular Stress Response
- Protein Synthesis Regulation
Background:
- Genotoxic and non-genotoxic stresses trigger cellular responses to inhibit protein synthesis.
- Downregulation of protein synthesis under stress can either aid survival or induce apoptosis.
- Regulation of translation initiation is a key aspect of the cellular stress response.
Purpose of the Study:
- To review evidence supporting the role of translation initiation regulation in cellular stress response.
- To highlight the emerging understanding of stress-induced regulation of translation initiation factors (eIFs) at the mRNA level.
Main Methods:
- Review of existing scientific literature and evidence.
- Analysis of studies on stress-induced post-translational and mRNA-level regulation of translation initiation factors.
Main Results:
- Stress-induced post-translational regulation of translation initiation factors (eIFs) is well-documented.
- Stress-mediated regulation of eIFs at the mRNA level is an area of ongoing research.
- eIF regulation occurs through multiple mechanisms: transcriptional, post-transcriptional, and post-translational controls.
Conclusions:
- Regulation of translation initiation is a crucial component of the cellular stress response.
- Understanding the multifaceted regulation of eIFs provides insights into cell survival and death pathways.
- Further research into mRNA-level regulation of eIFs is essential for a comprehensive view of cellular stress adaptation.