Cancer Institute A national cancer institute
designated cancer center

Linda Boxer, MD, PhD

Publication Details

  • Role of the cyclic AMP response element in the bcl-2 promoter in the regulation of endogenous Bcl-2 expression and apoptosis in murine B cells MOLECULAR AND CELLULAR BIOLOGY Xiang, H., Wang, J., Boxer, L. M. 2006; 26 (22): 8599-8606


    We have previously shown for B-cell lines that the cyclic AMP response element (CRE) is a major positive regulatory site in the bcl-2 promoter. However, the role of the CRE in the regulation of endogenous bcl-2 expression in vivo has not been characterized. We used gene targeting to generate knock-in mice in which a mutated CRE was introduced into the bcl-2 promoter region (mutCRE-bcl2 mice). Quantitative chromatin immunoprecipitation assays revealed that mutation of the CRE abolished the binding of CREB/ATF and CBP transcription factors to the bcl-2 promoter and greatly diminished the binding of NF-kappaB factors. The mutant CRE significantly reduced the expression of Bcl-2 in B cells and rendered them susceptible to surface immunoglobulin- and chemotherapeutic agent-induced apoptosis. The low levels of Bcl-2 were not changed with activation of the cells. The numbers of pre-B, immature B, and mature B cells in the bone marrow were decreased, as were the numbers of splenic B cells in mutCRE-bcl2 mice. Our findings indicate that the CRE in the bcl-2 promoter has an important functional role in the regulation of endogenous Bcl-2 expression and plays a critical role in the coordination of signals that regulate B-cell survival.

    View details for DOI 10.1128/MCB.01062-06

    View details for Web of Science ID 000241926100033

    View details for PubMedID 16982684

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