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- W2071307574 abstract "EBV-encoded LMP-1 is absolutely required for EBV transformation of cells. Previous studies showed that LMP-1 is responsible for mediating resistance to the anti-proliferative effects of TGF-beta that characterizes EBV-transformed cells. To clarify the mechanisms of resistance to TGF-beta by LMP-1, we examined the effect of expression of LMP-1 on the activity of TGF-beta-responsive promoters. Interestingly, LMP-1 inhibited TGF-beta-responsive promoters activity despite lack of direct interaction of LMP-1 and Smad proteins, intracellular signaling molecules in the TGF-beta signal transduction pathway. Although TGF-beta treatment increased the expression of p15, TGF-beta-induced gene, this effect was counteracted by expression of LMP-1. The repressive effect was mapped to the NF-kappaB activation domains in the cytoplasmic carboxyl terminus of LMP-1. Furthermore, LMP-1-mediated inhibition of TGF-beta-responsive promoter was markedly restored after inhibition of NF-kappaB activity. LMP-1 failed to affect receptor-dependent formation of heteromers containing Smad proteins as well as the DNA-binding activity of Smad proteins. Overexpression of the transcriptional coactivator CBP and p300 abrogated the inhibitory effect of LMP-1 on the TGF-beta-responsive promoter. Our results suggest that LMP-1 represses the TGF-beta signaling through the NF-kappaB signaling pathway at transcriptional level by competing for a limited pool of transcriptional coactivators. These results enhance our understanding of the molecular mechanisms of viral pathogenesis in EBV-associated malignancies." @default.
- W2071307574 created "2016-06-24" @default.
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- W2071307574 date "2003-05-05" @default.
- W2071307574 modified "2023-10-13" @default.
- W2071307574 title "Repression of Smad-dependent transforming growth factor-? signaling by Epstein-Barr virus latent membrane protein 1 through nuclear factor-?B" @default.
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- W2071307574 doi "https://doi.org/10.1002/ijc.11146" @default.
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