期刊
ONCOGENE
卷 28, 期 11, 页码 1471-1476出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/onc.2008.492
关键词
Epstein-Barr virus; LMP2A; Burkitt's lymphoma; Bcl; Myc; transgenic models
资金
- Public Health Service [CA62234, CA73507]
Despite the identification of Epstein-Barr virus (EBV) in tumors of Burkitt's lymphoma (BL) over 40 years ago, the exact contribution of EBV to BL is undefined. EBV encodes for multiple proteins in latent B cells that affect B cell survival and activation. One such protein, latent membrane protein 2A (LMP2A), protects B cells from numerous pro-apoptotic stimuli. Therefore, we tested whether LMP2A protects B cells from apoptosis induced by aberrant c-MYC expression that precedes and dominates BL. We crossed LMP2A-transgenic mice (LMP2A-Tg), in which all B cells express LMP2A, to a transgenic mouse that expresses a BL translocation of myc (lambda-MYC-Tg mice). LMP2A promotes proliferation and protects B cells from MYC-induced apoptosis in lambda-MYC-Tg mice. LMP2A also accelerates the development of lymphoma in LMP2A/lambda-MYC-Tg mice. Finally, LMP2A increases the expression of Bcl-X-L in both pretumor B cells and tumor cells, suggesting a mechanism for LMP2A-mediated B cell survival in the presence of MYC. These results support a hypothesis that EBV LMP2A promotes tumor development by protecting pre-tumor B cells that would normally apoptose after the c-myc translocation.
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