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Komarek M, Bernheim A, Schindler R, Steden R, Kiowski W, Brunner-La Rocca HP. Vascular Effects of Natriuretic Peptides in Healthy Men. J Cardiovasc Pharmacol Ther 2016; 9:263-70. [PMID: 15678245 DOI: 10.1177/107424840400900406] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background: Most effects of atrial (ANP) and B-type natriuretic peptide (BNP) result from stimulation of the guanylyl-cyclase type A receptor. Chronic elevation causes hyporesponsiveness to ANP, whereas BNP effects tend to be preserved, implying an additional pathway of action. We, therefore, investigated the hemodynamic effects of co-infusion of ANP, BNP, and, as a positive control acting on type B receptor, C-type natriuretic peptide (CNP). Furthermore, vascular responses to short and prolonged infusions were compared to investigate rapid hyporesponsiveness of guanylyl-cyclase type A receptor. Methods: In 11 healthy volunteers, arterial response to continuous intra-arterial infusion of ANP (60 pmol/100 mL forearm tissue volume [FAV]/min) was assessed by venous occlusion plethysmography. Then, co-infusion of a similar dose of ANP, BNP, or CNP was administered in randomized order. Each infusion phase was followed by a washout period. Then, ANP was restarted, followed by co-infusion of one of the natriuretic peptides not yet infused. After a further washout period, ANP was restarted, followed by co-infusion of the natriuretic peptide not yet co-infused. In 6 subjects, infusion time was adjusted to plasma half-lives (5 times), and in the other 5 subjects, infusion time was 5 minutes. Results: ANP alone caused the expected vasodilation from 2.7 ± 0.3 mL/min/100 mL FAV to 6.0 ± 0.9 mL/min/100 mL FAV ( P < .004). This response remained unchanged in the group that received short-term infusions (6.2 ± 0.8 mL/min/100 mL FAV to 6.6 ± 1.1 mL/min/100mL FAV) but was reduced over time in the group receiving longer-term infusions (6.5 ± 1.2 mL/min/100 mL FAV to 4.5 ± 0.7 mL/min/100mL FAV, P < .05; difference between groups P < .05). Co-infusions of ANP, BNP, and CNP caused minor additional vasodilation (mean 0.8 ± 0.2 mL/min/100ml FAV, P < .01), which did not differ between the different co-infused natriuretic peptides. Conclusion: Our data provide evidence for rapid desensitization of the guanylyl-cyclase type A receptor in humans, but do not support the presence of a BNP-specific receptor.
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Affiliation(s)
- Marius Komarek
- Division of Cardiology, University Hospital, Zurich, Switzerland
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