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Activation of interferon regulatory factor 3 in response to DNA-damaging agents
1National Creative Research Initiative Center for Genetic Reprogramming, Institute for Molecular Biology and Genetics, Seoul National University, Seoul 151-742, Korea. TK_Kim@hms.harvard.edu
Abstract:
Genotoxic stress triggers signal transduction pathways that mediate either the protection or apoptosis of affected cells. The interferon regulatory factors (IRFs) are involved in a wide range of host defense mechanisms against environmental stresses. Treatment with DNA-damaging agents, including doxorubicin and UV radiation, caused phosphorylation of the IRF3 transcription factor. Phosphorylation of IRF3 induced its interaction with the transcriptional co-activator cAMP-response element binding protein-binding protein. Furthermore, genotoxic stress-induced phosphorylation of IRF3 resulted in its movement from the cytoplasm to the nucleus, where it activated transcription from its binding site. These observations suggest that IRF3 plays a role in the defensive responses induced by genotoxic stress.
Insights
Genotoxic stress activates interferon regulatory factor 3 (IRF3) through phosphorylation, promoting cell defense. This process involves IRF3 moving to the nucleus to activate protective gene transcription.
Area of Science:
- Molecular Biology
- Cellular Stress Response
- Signal Transduction
Background:
- Genotoxic stress initiates cellular pathways for protection or apoptosis.
- Interferon regulatory factors (IRFs) are key in host defense against environmental stresses.
Purpose of the Study:
- To investigate the role of IRF3 in cellular responses to genotoxic stress.
- To elucidate the molecular mechanisms underlying IRF3 activation by DNA-damaging agents.
Main Methods:
- Treatment of cells with DNA-damaging agents (doxorubicin, UV radiation).
- Analysis of IRF3 phosphorylation and its subcellular localization.
- Investigation of IRF3 interaction with transcriptional co-activators.
Main Results:
- DNA-damaging agents induced phosphorylation of the IRF3 transcription factor.
- Phosphorylated IRF3 interacted with cAMP-response element binding protein-binding protein.
- Genotoxic stress caused IRF3 translocation from the cytoplasm to the nucleus, activating transcription.
Conclusions:
- IRF3 is a crucial mediator of cellular defense against genotoxic stress.
- IRF3 phosphorylation and nuclear translocation are key events in the DNA damage response pathway.