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- W2034963012 abstract "Abstract Treatment with angiotensin-converting enzyme inhibitors increases the angiotensin-(1-7) [Ang-(1-7)] and bradykinin concentrations in plasma and tissue. In this study we evaluated the interaction between these peptides by determining the effect of Ang-(1-7) on the hypotensive action of bradykinin in conscious rats. Administration of Ang-(1-7) (5 nmol) did not change mean arterial pressure or heart rate. However, the hypotensive effect of bradykinin, produced by an intravenous or intra-arterial route, was potentiated by Ang-(1-7) in a dose-dependent manner. The Ang-(1-7) doses necessary to transform the effect of a single dose of bradykinin into that produced by a double dose (potentiating unit) were 2 nmol IV and 5 nmol IA. The Ang-(1-7) dose used did not change either the pressor effect of Ang II or the hypotensive effect of sodium nitroprusside. The bradykinin-potentiating Ang-(1-7) activity was significantly attenuated by pretreatment with indomethacin (5 mg/kg IM, n=4). In an additional group the bradykinin-potentiating activity of Ang-(1-7) was evaluated 30 minutes after treatment with the angiotensin-converting enzyme inhibitor enalaprilat (10 mg/kg IV, n=9). Under this condition the bradykinin-potentiating activity of Ang-(1-7) was substantially increased, resulting in a potentiating unit of approximately 0.2 nmol IV. Pretreatment with indomethacin (5 mg/kg IM, n=7) also attenuated the bradykinin-potentiating activity of Ang-(1-7) in enalaprilat-treated rats. These results show that Ang-(1-7) is a bradykinin-potentiating peptide in vivo. Furthermore, the data obtained with indomethacin suggest that prostaglandins participate in the mechanism of the bradykinin potentiation by Ang-(1-7). More importantly, these data suggest that the interaction between Ang-(1-7) and bradykinin can contribute to the pharmacological effects of angiotensin-converting enzyme inhibitors." @default.
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- W2034963012 date "1995-12-01" @default.
- W2034963012 modified "2023-09-23" @default.
- W2034963012 title "Angiotensin-(1-7) Potentiates the Hypotensive Effect of Bradykinin in Conscious Rats" @default.
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- W2034963012 doi "https://doi.org/10.1161/01.hyp.26.6.1154" @default.
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