Abstract
Bcl-2 stimulates mutagenesis after the exposure of cells to DNA-damaging agents. However, the biological mechanisms of Bcl-2-mediated mutagenesis have remained largely obscure. Here we demonstrate that the Bcl-2-mediated suppression of hMSH2 expression results in a reduced cellular capacity to repair mismatches. The pathway linking Bcl-2 expression to the suppression of mismatch repair (MMR) activity involves the hypophosphorylation of pRb, and then the enhancement of the E2F–pRb complex. This is followed by a decrease in hMSH2 expression. MMR has a key role in protection against deleterious mutation accumulation and in maintaining genomic stability. Therefore, the decreased MMR activity by Bcl-2 may be an underlying mechanism for Bcl-2-promoted oncogenesis.
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Acknowledgements
This work was supported by the Ministry of Science and Technology of Korea and the Korea Science and Engineering Foundation through the Research Center for Proteineous Materials, and was supported by the Molecular and Celluar BioDiscovery Research Program grant from the Ministry of Science and Technology, South Korea. We thank J. S. Valentine (University of California) for the Bcl-2 cDNA; W. G. Kaelin Jr (Harvard Medical School, Boston) for the pCMV–E2F1-Y411C plasmid; W. Heyns (Catholic University of Leuven, Leuven, Belgium) for the E2F reporter construct; S.J. Korsmeyer (Washington University School of Medicine) for Bcl-2G145A; S. Cory and J. Adams (The Walter and Eliza Hall Institute of Medical Research, Australia) for the Bcl-2Y28A; T.H. Kim for Bcl-XL cDNA (Chosun University School of Medicine, Korea); C. Thomas and A. Kunkel (National Institutes of Health) for HCT116 and HCT116-chr3; A. L. Epstein (University of Southern California) for SU-DHL-9, SU-DHL-6 and SU-DHL-4; and R. Boland (University of California) for HEC59 and HEC59-chr2.
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Youn, CK., Cho, HJ., Kim, SH. et al. Bcl-2 expression suppresses mismatch repair activity through inhibition of E2F transcriptional activity. Nat Cell Biol 7, 137–147 (2005). https://doi.org/10.1038/ncb1215
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DOI: https://doi.org/10.1038/ncb1215