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Regulatory interfaces between the stress protein response and other gene expression programs in the cell
1Division of Molecular and Cellular Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, 21-27 Burlington Avenue, Boston, MA 02215, USA. scalderw@bidmc.harvard.edu
Methods (San Diego, Calif.)
|January 15, 2005
Summary
Cellular stress responses are antagonistic. Activating inflammatory or cell cycle programs inhibits heat shock factor 1 (HSF1), while protein stress represses these other programs, prioritizing heat shock protein (HSP) synthesis.
Area of Science:
- Molecular biology
- Cellular stress response
- Gene expression regulation
Background:
- The stress protein response involves heat shock proteins (HSP) synthesis upon proteomic insult.
- Cellular responses to inflammation and cell cycle entry are distinct gene expression programs.
Purpose of the Study:
- To investigate the interplay between the stress protein response and other cellular programs like inflammation and cell cycle entry.
- To understand how these responses affect heat shock factor 1 (HSF1) activity and gene expression.
Main Methods:
- Inducing inflammatory and mitogenic responses in cells.
- Exposing cells to proteomic stress.
- Analyzing gene expression patterns and HSF1 activity.
Main Results:
- Inflammatory and mitogenic stimuli inhibit HSF1 through phosphorylation.
- Protein stress leads to HSF1 activation and repression of inflammatory/mitogenic genes.
- The stress protein response antagonizes other gene expression programs.
Conclusions:
- Cellular stress responses are mutually antagonistic, prioritizing protein damage repair.
- HSF1 plays a central role in mediating this antagonism.
- Understanding these interactions is key to cellular resilience.