Immediate prostaglandin E2 synthesis in rat 3Y1 fibroblasts following vasopressin V1a receptor stimulation |
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| Authors: | Nakatani Yoshihito Chin Yuka Hara Shuntaro Kudo Ichiro |
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| Affiliation: | Department of Health Chemistry, School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan. nakatani@pharm.showa-u.ac.jp |
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| Abstract: | Arginine vasopressin (AVP) induces immediate prostaglandin E(2) (PGE(2)) production in rat 3Y1 fibroblasts. Judging from effects of several inhibitors, cytosolic phospholipase A(2)alpha (cPLA(2)alpha) and cyclooxygenase-1 (COX-1) were mainly involved in this reaction. The antagonist of vasopressin receptor V1a, and not that of V2, inhibited the AVP-induced PGE(2) synthesis, indicating that AVP activates cPLA(2)alpha through V1a receptor. Treatment of 3Y1 cells with AVP resulted in transient activation of p44/42 mitogen-activated protein kinase (MAPK) and cPLA(2)alpha, and phosphatidylinositol 3-kinase (PI3K) inhibitor blocked not only AVP-induced PGE(2) synthesis but also MAPK activation, suggesting that PI3K is involved in the AVP-induced MAPK and cPLA(2)alpha activation, which initiates the production of PGE(2). These results suggest that PGE(2) generated by the stimulation of AVP probably modulates the physiological effects of AVP. |
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| Keywords: | PG, prostaglandin AVP, arginine vasopressin COX, cyclooxygenase MAPK, mitogen-activated protein kinase PI3K, phosphatidylinositol 3-kinase PLA2, phospholipase A2 PGES, PGE synthase PKC, protein kinase C IL-1, interleukin-1 TNF, tumor necrosis factor |
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