Abstract
The analysis of the 100000 × g supernatant fraction of cultured rat glomerular mesangial cells with DEAE-cellulose ion-exchange chromatography revealed a large peak showing the activity of a protein kinase (protein kinase C) which depended on phospholipid and diolein as well as Ca 2+ Furthermore, it was shown that angiotensin II (AII) (10 −6 M) induced rapid hydrolysis of phosphatidylinositol 4,5-bisphosphate, leading to production of diacylglycerol rich in arachidonic acid, in the cultured rat mesangial cells. These results suggest that activation of protein kinase C resulting from enhancement of phosphoinositide metabolism may be important as an intracellular regulatory mechanism of AII upon cultured mesangial cells.
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