Epstein-Barr virus LMP2A accelerates MYC-induced lymphomagenesis.

Epstein-Barr virus LMP2A accelerates MYC-induced lymphomagenesis.
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爱泼斯坦 - 巴尔病毒LMP2A加速了MYC诱导的淋巴作用。

DOI:
10.1038/onc.2008.492
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发表时间:
2009-03-19
期刊:
影响因子:
8
通讯作者:
Swanson-Mungerson, M.
Swanson-Mungerson, M.
中科院分区:
医学1区
文献类型:
--
作者:
Bultema, R.;Longnecker, R.;Swanson-Mungerson, M.

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尽管40多年前在伯基特淋巴瘤(BL)的肿瘤中鉴定出EB病毒(EBV),但EBV对BL的确切贡献尚未确定。EBV编码潜伏B细胞中的多种蛋白质,其影响B细胞存活和活化。一种这样的蛋白,潜伏膜蛋白2A(LMP 2A),保护B细胞免受多种促凋亡刺激。因此,我们测试了LMP 2A是否保护B细胞免于由在BL之前和主导BL的异常c-MYC表达诱导的凋亡。我们将所有B细胞表达LMP 2A的LMP 2A转基因小鼠(LMP 2A-Tg)与表达myc BL易位的转基因小鼠(λ-MYC-Tg小鼠)杂交。LMP 2A促进λ-MYC-Tg小鼠增殖并保护B细胞免受MYC诱导的凋亡。LMP 2A还加速LMP 2A/λ-MYC-Tg小鼠中淋巴瘤的发展。最后,LMP 2A增加了肿瘤前B细胞和肿瘤细胞中Bcl-XL的表达,表明在MYC存在下LMP 2A介导的B细胞存活的机制。这些结果支持EBV LMP 2A通过保护在c-myc易位后正常情况下会发生凋亡的肿瘤前B细胞而促进肿瘤发展的假设。
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 if 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 (λ-MYC-Tg mice). LMP2A promotes proliferation and protects B cells from MYC-induced apoptosis in λ-MYC-Tg mice. LMP2A also accelerates the development of lymphoma in LMP2A/λ-MYC-Tg mice. Finally, LMP2A increases the expression of Bcl-XL in both pre-tumor 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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