Abstract
1. The contribution of endogenous kinins to the regulation of blood pressure and renal function of Wistar rats was evaluated by use of the new B2-receptor antagonist, Hoe 140, (D-Arg[Hyp3,Thi5,D-Tic7,Oic8]-bradykinin). 2. Neither Hoe 140 (4 micrograms h-1 s.c., for 6 weeks), nor vehicle altered systolic blood pressure (SBP, tail-cuff plethysmography) or renal function in rats, under normal conditions. 3. Chronic administration of deoxycorticosterone (DOC, 25 mg kg-1 s.c., weekly) increased SBP slightly only after 6 weeks (from 124 +/- 2 to 133 +/- 3 mmHg, P < 0.05). An earlier and greater rise in SBP (P < 0.01) occurred when DOC was combined with chronic infusion of Hoe 140 (from 125 +/- 1 to 154 +/- 3, P < 0.01). The hypertensive effect of Hoe 140 was confirmed by direct measurement of mean blood pressure (143 +/- 2 vs 122 +/- 2 mmHg in controls, P < 0.01). 4. DOC caused an initial fall, followed by a transitory increase in urinary volume and sodium excretion; thereafter, both parameters returned to baseline. The initial antidiuretic and antinatriuretic effects were enhanced by Hoe 140 (P < 0.05). 5. Urinary prostaglandin E2 excretion was increased by DOC (from 106 +/- 3 to 153 +/- 4 ng 24 h-1, P < 0.01) and this effect was prevented by Hoe 140 (from 95 +/- 3 to 104 +/- 3 ng 24 h-1, NS). By contrast, the high urinary vasopressin excretion and suppressed plasma renin activity found in DOC-treated rats were not altered by Hoe 140.(ABSTRACT TRUNCATED AT 250 WORDS)
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