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Response to cAMP le...
Response to cAMP levels of the Epstein-Barr virus EBNA2-inducible LMP1 oncogene and EBNA2 inhibition of a PP1-like activity.
- Artikel/kapitelEngelska1994
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LIBRIS-ID:oai:gup.ub.gu.se/215786
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https://gup.ub.gu.se/publication/215786URI
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The expression of the Epstein-Barr virus LMP1 oncogene is regulated by viral and non-viral factors in a tissue dependent fashion. The virus encoded transcription factor EBNA2 induces its expression in human B-cells. However, this induction also requires the contribution of cellular and/or other viral factors. In nasopharyngeal carcinoma cells and in cells from Hodgkin's lymphoma, LMP1 gene transcription is independent of viral products. Here we show that the effect of a factor binding to a cAMP responsive-like element (CRE) in the LMP1 gene transcription regulatory sequence (LRS) is essential for efficient promoter activity in the DG75 B-cell line and that elevation of cAMP levels in the cells induces LRS-derived CAT activity in a CRE dependent fashion. Incubation of two EBV-immortalized B-cell lines expressing endogenous EBNA2A with 8-Br cAMP increased the levels of the latency associated 66 kDa LMP1 within 2 h. Interestingly, LMP1 expression in DG75 cells conferred resistance to the inhibitory effect of 8-Br cAMP on cell proliferation. The protein phosphatase 1 and 2A (PP1 and PP2A, respectively) inhibitor okadaic acid also stimulated LRS-CAT activity in DG75 cells. EBNA2A from an EBV-immortalized B-cell line co-immunopurified with a PP1-like protein. An EBNA2A fragment spanning residues 324-436 fused to the GST protein specifically rescued a PP1/PP2A-like component from DG75 cell extracts. This GST-EBNA2A fusion product inhibited a PP1-like activity in nuclear extracts from these cells.
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Palmqvist, Lars,1965Gothenburg University,Göteborgs universitet,Institutionen för laboratoriemedicin, Avdelningen för klinisk kemi/transfusionsmedicin,Institute of Laboratory Medicine, Dept of Clinical Chemistry/Transfusion Medicine(Swepub:gu)xpalla
(författare)
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Nerstedt, Annika,1960Gothenburg University,Göteborgs universitet,Institutionen för laboratoriemedicin, Avdelningen för klinisk kemi/transfusionsmedicin,Institute of Laboratory Medicine, Dept of Clinical Chemistry/Transfusion Medicine(Swepub:gu)xneran
(författare)
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Farzad, SiminGothenburg University,Göteborgs universitet,Institutionen för laboratoriemedicin, Avdelningen för klinisk kemi/transfusionsmedicin,Institute of Laboratory Medicine, Dept of Clinical Chemistry/Transfusion Medicine
(författare)
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Rymo, Lars,1940Gothenburg University,Göteborgs universitet,Institutionen för laboratoriemedicin, Avdelningen för klinisk kemi/transfusionsmedicin,Institute of Laboratory Medicine, Dept of Clinical Chemistry/Transfusion Medicine(Swepub:gu)xrymla
(författare)
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Laín, SoniaGothenburg University,Göteborgs universitet,Institutionen för laboratoriemedicin, Avdelningen för klinisk kemi/transfusionsmedicin,Institute of Laboratory Medicine, Dept of Clinical Chemistry/Transfusion Medicine
(författare)
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Göteborgs universitetInstitutionen för laboratoriemedicin, Avdelningen för klinisk kemi/transfusionsmedicin
(creator_code:org_t)
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Ingår i:The EMBO journal13:24, s. 6041-510261-4189
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