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Suppression of c-myc or fosB-induced cell transformation by the transcription factor IRF-1
N Tanaka1, M Ishihara, T Taniguchi
1Institute for Molecular and Cellular Biology, Osaka University, Japan.
Abstract:
The transcriptional activator IRF-1 and its antagonistic repressor IRF-2 are regulators of the interferon (IFN) system and of cell growth. Overexpression of IRF-2 leads to transformation of NIH3T3 cells, and the concomitant overexpression of IRF-1 reverts this transformed phenotype. Here we report that c-myc- or fosB-transformed rat embryonic fibroblast cells can be reverted by the introduction of the IRF-1 gene. Thus, the anti-oncogenic function of IRF-1 is not limited to only IRF-2 overexpressing cells, suggesting the broad role of IRF-1 as a tumor suppressor.
Insights
Interferon regulatory factor-1 (IRF-1) acts as a tumor suppressor by reverting transformed cells. This anti-oncogenic function extends beyond IRF-1
Area of Science:
- Molecular biology
- Cell biology
- Cancer research
Background:
- Interferon regulatory factor-1 (IRF-1) and IRF-2 regulate the interferon system and cell growth.
- IRF-2 overexpression transforms NIH3T3 cells.
- IRF-1 overexpression reverts this transformation.
Purpose of the Study:
- To investigate the broader anti-oncogenic function of IRF-1.
- To determine if IRF-1 can revert other types of transformed cells.
Main Methods:
- Introduction of the IRF-1 gene into c-myc- or fosB-transformed rat embryonic fibroblast cells.
- Observation of phenotypic changes.
Main Results:
- IRF-1 gene introduction reverted c-myc- or fosB-transformed rat embryonic fibroblast cells.
- The anti-oncogenic effect of IRF-1 is not restricted to IRF-2 overexpressing cells.
Conclusions:
- IRF-1 demonstrates a broad tumor suppressor function.
- IRF-1's role in preventing cancer is significant and not limited to specific cellular contexts.