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- W2107869070 abstract "Human papillomavirus (HPV) is the major cause of uterine cervical cancer, but the role of the HPV E5 in carcinogenesis is not clearly understood. Prostaglandins are known to contribute to carcinogenesis of cervical cancer, and we therefore investigated the effect of HPV16 E5 on the expression of prostaglandin E2 (PGE2) receptors and underlying mechanisms. Stable expression of the E5 induced expression of the EP4 subtype of PGE2 receptors in C33A cervical cancer cells, and transfection of E5 small interfering RNA (siRNA) decreased it. EP4 protein expression was increased in human cervical cancer tissues, and EP4 mediated E5-induced increase in anchorage-independent colony formation and vascular endothelial growth factor expression. E5 induced cyclooxygenase-2 (COX-2) expression, and COX-2 increased PGE2 secretion and EP4 expression. The induction of EP4 by PGE2 and E5 was inhibited by an EP4 antagonist, inhibitors of cyclic adenosine monophosphate-dependent protein kinase or phosphatidylinositol 3-kinase, and a cyclic adenosine monophosphate response element (CRE) decoy. E5 increased the luciferase expression controlled by a variant CRE of the EP4 promoter, and it also increased the binding of cyclic adenosine monophosphate response element binding protein (CREB) to oligonucleotides containing this CRE. We conclude that the HPV16 E5 protein induces EP4 receptor protein in cervical cancer cells and that this induction involves epidermal growth factor receptor, COX-2, PGE2, EP2 and EP4, protein kinase A, CREB and CRE." @default.
- W2107869070 created "2016-06-24" @default.
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- W2107869070 date "2008-10-09" @default.
- W2107869070 modified "2023-10-08" @default.
- W2107869070 title "Human papillomavirus E5 protein induces expression of the EP4 subtype of prostaglandin E2 receptor in cyclic AMP response element-dependent pathways in cervical cancer cells" @default.
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- W2107869070 doi "https://doi.org/10.1093/carcin/bgn236" @default.
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