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Inositol phosphate formation in arterial smooth muscle from rabbits with perinephritis hypertension.

Total inositol phosphate formation was measured in the aorta and femoral artery from rabbits at 1, 2 and 6 weeks after kidney wrapping, at which times the mean arterial pressures were 88 +/- 4, 96 +/- 3 and 126 +/- 7 mmHg against a control pressure of 74 +/- 3 mmHg. Noradrenaline-stimulated (10(-7) to 10(-4) mol/l) inositol phosphate formation was increased in the aorta and femoral artery from hypertensive rabbits at 2 weeks (aorta noradrenaline 10(-6) mol/l sham, 105 +/- 14%; hypertensive, 164 +/- 20% of control). Noradrenaline-stimulated inositol phosphate formation was unchanged at 1 and 6 weeks in the aorta. Endothelin-stimulated inositol phosphate formation was unchanged at 2 weeks. Basal inositol phosphate formation was not significantly different in normotensive and hypertensive animals. In perinephritis hypertension there is an alteration in phosphatidylinositol metabolism in arterial smooth muscle. This occurs at the time when the blood pressure is rising rapidly. This alteration may affect a specific phosphatidylinositol pool that is linked to the alpha-adrenoceptor but not to the endothelin receptor.