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Role of endogenous endothelin in the development of hypertension in rats.

To further elucidate the pathophysiologic role of endogenous endothelin (ET), we have studied the chronic effect of anti-ET gamma-globulin on the development of hypertension in spontaneously hypertensive rats (SHR) and stroke prone SHR (SHR-SP) for three weeks. In neither SHR nor SHR-SP did repetitive bolus injection of anti-ET gamma-globulin suppress the rise in blood pressure. The present data suggest that endogenous ET is not likely to play a key role in the development of hypertension, although ET may induce a local vasoconstriction at the injured vascular wall.