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- W1567327133 abstract "In rat aortic smooth muscle cells, vasopressin (AVP) induces prostacyclin (PGI2) production, probably as the consequence of phospholipase C activation. Our study analyzes the effects of phorbol 12-myristate 13-acetate (PMA)-induced protein kinase C (PKC) activation on AVP-induced inositol 1,4,5-trisphosphate formation, cytosolic free Ca2+ concentration [( Ca2+]c), and PGI2 production. PMA rapidly decreased PKC activity in the cytosol of smooth muscle cells, while increasing it transiently in the membranes with a maximum around 20 min. Prior exposure of the cells to PMA resulted in a transient inhibition of both AVP-induced inositol 1,4,5-trisphosphate formation and [Ca2+]c rise. This was inversely correlated with membraneous PKC activity and partially reversed by the PKC inhibitor staurosporine. In contrast, pretreating the cells with PMA markedly potentiated A23187 or AVP-induced PGI2 production. Under those conditions, AVP-induced PGI2 production did not correlate either with PMA-induced membranous PKC activity or with AVP-induced PLC activation. However, this potentiating effect of PMA was reversed by staurosporine and was not mimicked by the 4 alpha-phorbol, an inactive analogue of PMA. Thus, the possibility is raised that, while inhibiting AVP-induced PLC activation, PMA-induced PKC activation increases the Ca2+ sensitivity of the cellular signaling system leading to PGI2 production." @default.
- W1567327133 created "2016-06-24" @default.
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- W1567327133 date "1990-06-01" @default.
- W1567327133 modified "2023-09-30" @default.
- W1567327133 title "Inhibitory and stimulatory effects of phorbol ester on vasopressin-induced cellular responses in cultured rat aortic smooth muscle cells." @default.
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- W1567327133 doi "https://doi.org/10.1016/s0021-9258(18)86968-x" @default.
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