Hormone interactions in the isolated rabbit heart. Synthesis and coronary vasomotor effects of prostaglandins, angiotensin, and bradykinin.

Circulation Research
P NeedlemanB E Sobel

Abstract

In the present study, the synthesis and degradation of several potent vasoactive substances influencing coronary resistance were characterized in the isolated perfused rabbit heart. Prostaglandin synthetase activity, angiotensin converting enzyme activity, and bradykininase activity (without angiotensinase) were observed. A prostaglandin E2-like substance appeared to be the ednogenous mediator of the coronary vasodilation produced by bradykinin and angiotensin II (AII). (1) The concentration of this prostaglandinlike substance in the coronary venous effluent was directly proportional to the concentration of the coronary vasocilator stimulus (bradykinin or AII). (2) The prostaglandinlike substance released and the coronary dilation produced by the agonists correlated temporally and quantitatively. (3). Abolition of cardiac biosynthesis of the prostaglandinlike substance by indomethacin also abolished the decrease in coronary resistance produced by the agonists. AII, the most potent naturally occurring vasoconstrictor substance, produced a paradoxical coronary vasodilation because it stimulated cardiac prostaglandin biosynthesis, but the direct coronary vasoconstrictor action of AII could be readily unmasked by indomethacin, whic...Continue Reading

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