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. 1996 Jul 1;134(1):13–23. doi: 10.1083/jcb.134.1.13

Bcl-2 down-regulates the activity of transcription factor NF-kappaB induced upon apoptosis

PMCID: PMC2120920  PMID: 8698809

Abstract

Among the many target genes of the transcription factor NF-kappaB are p53 and c-myc, both of which are involved in apoptosis. This prompted us to investigate the role of NF-kappaB in this process. We report that NF-kappaB is potently activated upon serum starvation, a condition leading to apoptosis in 293 cells. Similar to Bcl-2, a transdominant- negative mutant of the NF-kappaB p65 subunit partially inhibited apoptosis, indicating a direct involvement of the transcription factor in induction of cell death. As expected, the p65 mutant suppresses kappaB-dependent gene expression. Surprisingly, transiently or stably overexpressed Bcl-2 had the same effect. The transcription inhibitory activity of the two proteins correlated with their cell death protective potential. Like Bcl-2, the related protein Bcl-xL but not Bcl-xS was able to suppress kB-dependent transcription. Bcl-2 inhibited NF-kappaB activity by an unusual mechanism. It did not prevent the release of IkappaB in the cytoplasm but down-modulated the transactivating potential of nuclear p65. These data show that NF- kappaB can participate in apoptosis. We suggest that at least part of the anti-apoptotic potential of Bcl-2 may be explained from a hitherto undiscovered activity of Bcl-2 in controlling nuclear gene expression.

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Selected References

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