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• W2022277753 abstract "Expression of the Epstein – Barr virus (EBV) transforming LMP1 in B cells activates the transcription factor NF-κB and induces phenotypic changes through two distinct domains in the cytoplasmic C-terminus of the protein. The aa 187 – 231 domain of LMP1, which is important for growth transformation, binds tumour necrosis factor (TNF) receptor associated factor (TRAF) 1 and TRAF3 and this interaction mediates subsequent signalling events. The TRAFs also associate with CD40, a member of the TNFR family, which upon ligation activates NF-κB and induces phenotypic changes similar to those mediated by LMP1. This study demonstrates that LMP1 expression in carcinoma cell lines and SV40-transformed keratinocytes results in induction of the pleiotropic cytokine interleukin 6 (IL6), an effect which is also observed upon CD40 ligation. The mechanism by which either LMP1 expression or CD40 ligation induces IL6 production was found to be NF-κB-dependent. Mutational analysis identified domains in the C-terminus of LMP1 which are important for NF-κB activation and IL6 secretion. LMP1 and CD40 share a common PxQxT core TRAF binding motif and mutations in or adjacent to this sequence impaired the ability of LMP1 or CD40 to induce NF-κB activation and IL6 secretion. The importance of TRAF interactions in mediating these effects was confirmed using dominant negative TRAF2 and TRAF3 mutants which also identified differences in the signalling events mediated by the two NF-κB activating domains of LMP1. A20, an anti-apoptotic protein which interacts with TRAF2 and blocks CD40-mediated NF-κB activity, also blocked NF-κB and IL6 secretion in LMP1-transfected epithelial cells. These results suggest that LMP1 regulates IL6 production in epithelial cells in a manner similar to CD40 ligation and implicate TRAFs as common mediators in the transduction of signals generated via the CD40 and LMP1 pathways. As a role for IL6 in regulating epithelial cell growth has previously been suggested, the control of IL6 secretion via the CD40 and LMP1 pathways may have implications for the growth of both normal and transformed epithelial cells." @default.
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• W2022277753 date "1997-06-19" @default.
• W2022277753 modified "2023-09-26" @default.
• W2022277753 title "Epstein – Barr virus-encoded LMP1 and CD40 mediate IL-6 production in epithelial cells via an NF-κB pathway involving TNF receptor-associated factors" @default.
• W2022277753 cites W584325581 @default.
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• W2022277753 doi "https://doi.org/10.1038/sj.onc.1201258" @default.
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