Contributions of vasopressin and other pressor systems to DOC-salt hypertension in rats.
The roles of arginine vasopressin (AVP), the sympathetic nervous system, and the renin-angiotensin system in maintaining elevated blood pressure in established DOC-salt hypertension in rats were studied by injection of specific antagonists of these systems. The specific AVP antagonist dPVDAVP decreased blood pressure by 19 +/- 3 mm Hg in hypertensive rats and 6 +/- 2 mm Hg in control rats. In a different group of rats ganglionic blockade with chlorisondamine also caused a greater decrease in blood pressure in DOC-salt rats compared to controls (99 +/- 6 vs 58 +/- 4 mm Hg, respectively). In rats with autonomic ganglia blocked subsequent vasopressin antagonism decreased blood pressure 29 +/- 4 mm Hg in DOC-salt rats and 14 +/- 2 mm Hg in control rats. Converting enzyme inhibition with captopril in rats with autonomic ganglia blocked caused a lesser decrease in blood pressure in DOC-salt rats than in controls (8 +/- 2 vs 14 +/- 2 mm Hg, respectively). These results indicate that both AVP and the sympathetic nervous system contribute to the maintenance of DOC-salt hypertension. The renin-angiotension system appears to be relatively less important.
D000818:Animals; D001127:Arginine Vasopressin / Q000031:analogs & derivatives / Q000494:pharmacology / Q000502:physiology; D001794:Blood Pressure / Q000187:drug effects*; D003900:Desoxycorticosterone; D005260:Female; D006973:Hypertension / Q000139:chemically induced / Q000503:physiopathology*; D008297:Male; D009392:Nephrectomy; D051381:Rats; D012084:Renin-Angiotensin System / Q000187:drug effects; D012965:Sodium Chloride; D013564:Sympathetic Nervous System / Q000502:physiology; D014667:Vasopressins / Q000037:antagonists & inhibitors / Q000494:pharmacology*
D014667:Vasopressins; D001127:Arginine Vasopressin; D003900:Desoxycorticosterone; D012965:Sodium Chloride; C028799:argipressin, deaminopenicillamine(1)-Val(4)-