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• W2186202324 abstract "The role of the Ca2+-sensitive phospholipid-dependent protein kinase C (PKC) was studied in cultured rat aortic smooth-muscle cells, known to respond to angiotensin II (Ang II) by producing prostacyclin, determined by the release of 6-oxo-prostaglandin F1 alpha. PKC activity was measured in the cytosol and the solubilized membrane fraction after DEAE-cellulose chromatography using a linear NaCl gradient. Ang II stimulated the activity of PKC in the cytosolic and in the membrane fractions of aortic smooth-muscle cells. These increases in PKC activity were concentration-dependent and occurred rapidly, reaching a plateau within 10 min. In contrast, phorbol 12-myristate 13-acetate (PMA) rapidly decreased cytosolic PKC activity and at the same time increased membrane PKC activity to reach a plateau after 20 min. Cytosolic PKC activity from control and Ang II-stimulated cells was found to be less dependent on [Ca2+] than was the highly [Ca2+]-dependent membrane PKC activity from the same cells. In contrast, membrane PKC activity from PMA-treated cells was largely [Ca2+]-independent. In the presence of 10 nM-PMA, the sensitivity of cultured smooth-muscle cells towards Ang II was increased, and maximal values of Ang II-induced prostacyclin production were enhanced by about 60%. In cells incubated with both Ang II and PMA, an additive effect on membrane PKC activity was observed, whereas cytosolic PKC activity was suppressed as in cells treated with PMA alone. These results suggest that an increase of the membrane, but not the cytosolic, PKC activity represents a positive signal in the prostacyclin production induced by Ang II stimulation of aortic smooth-muscle cells. PMA seems to induce a state of activation of membrane PKC which does not need increased intracellular [Ca2+] to be fully expressed, whereas Ang II-stimulated membrane PKC activity requires higher Ca2+ concentrations. The possibility exists that the addition of both signals leads to the augmentation of Ang II-stimulated prostacyclin production." @default.
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• W2186202324 date "1989-04-15" @default.
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• W2186202324 title "Effects of angiotensin II and of phorbol ester on protein kinase C activity and on prostacyclin production in cultured rat aortic smooth-muscle cells" @default.
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• W2186202324 doi "https://doi.org/10.1042/bj2590477" @default.
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