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The effects of short-term oral treatment with captopril and enalapril (two angiotensin-I-converting-enzyme inhibitors [ACEIs] that were administered in equipotent antihypertensive doses) on the systemic vasopressor response and on the renal, mesenteric, and hindlimb vascular responses to cirazoline and UK-14,304 (alpha 1- and alpha 2-adrenergic receptor-specific agonists, respectively) were investigated in adult pithed spontaneously hypertensive rats (SHR) of the Okamoto-Aoki strain. In the nonbinephrectomized animal, captopril and enalapril reduced to the same extent the systemic blood pressure and renal and hindlimb vascular resistances. They also decreased to the same extent systemic pressor and regional vasoconstrictor responses to cirazoline and UK-14,304, especially in the renal and mesenteric vascular beds. Simultaneously, the effects of angiotensin I and angiotensin II on the pressor response were abolished and almost not modified. In the binephrectomized animals, captopril and enalapril no longer reduced the systemic blood pressure and regional vascular resistances, but whereas the sympathoinhibitory effect of captopril vs the systemic pressor and regional vasoconstrictor responses to cirazoline and UK-14,304 persisted, those of enalapril disappeared.(ABSTRACT TRUNCATED AT 250 WORDS)

Influence of captopril and enalapril on regional vascular alpha-adrenergic receptor reactivity in SHR.