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Thromboxane A2-induced phosphatidylcholine hydrolysis in porcine vascular smooth muscle cells
N Nakahata1, H Takano, Y Ohizumi
1Department of Pharmaceutical Molecular Biology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan. nakahata@mail.pharm.tohoku.ac.jp
Abstract:
The effect of 9,11-epithio-11,12-methanothromboxane A2 (STA2), a thromboxane A2 receptor agonist, on phosphatidylcholine hydrolysis was examined in porcine vascular smooth muscle cells. Although STA2 stimulated diacylglycerol production in a concentration-dependent manner, it only caused a slight accumulation of [3H]phosphatidylethanol in the presence of 0.5% ethanol, reflecting its weak stimulation of phosphatidylcholine-specific phospholipase D. STA2-induced diacylglycerol production was potently and concentration dependently inhibited by potassium tricyclo-[5.2.1.0(2.6)]-decyl-(9[8])-xanthogenate (D609), an inhibitor of phosphatidylcholine-specific phospholipase C. These results suggest that the thromboxane A2 receptor in vascular smooth muscles is functionally coupled to phosphatidylcholine-specific phospholipase C to yield diacylglycerol.
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