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Am J Physiol Regul Integr Comp Physiol 292: R354-R361, 2007. First published September 21, 2006; doi:10.1152/ajpregu.00440.2006
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RENAL HEMODYNAMICS AND CARDIORENAL INTEGRATION

Interactive modulation of renal myogenic autoregulation by nitric oxide and endothelin acting through ET-B receptors

¹Biology Department, Concordia University, Montréal, Québec; ²Lady Davis Institute for Medical Research, SMBD-Jewish General Hospital, Montréal, Québec; and ³Centre for Biomedical Research & Biology Department, University of Victoria, Victoria, British Columbia, Canada

Submitted 27 June 2006 ; accepted in final form 15 September 2006

In rats, nitric oxide modulates renal autoregulation in steady-state experiments and the myogenic mechanism in dynamic studies. Interactive modulation of autoregulation by nitric oxide and endothelin-1, predominantly involving endothelin B receptors, has been reported although it remains unclear whether the interaction is synergistic or obligatory or whether it affects the myogenic component of autoregulation. Nonselective inhibition of nitric oxide synthase (L-nitro-L-arginine methyl-ester; L-NAME) with endothelin A and B selective receptor antagonists BQ-123 and BQ-788, all infused into the renal artery, plus time series analysis were used to test the interactive actions of nitric oxide and endothelin on renal vascular conductance and on autoregulation. Nonselective endothelin receptor antagonism blunted the constrictor response to subsequent L-NAME but had no effect on previously established L-NAME-induced vasoconstriction. BQ-123 did not affect conductance and caused only minor reduction in myogenic autoregulatory efficiency. Responses to BQ-123 and L-NAME were additive and not interactive. BQ-788 and L-NAME each caused strong vasoconstriction alone and in the presence of the other, indicating that coupling between nitric oxide- and endothelin B-mediated events is not obligatory. L-NAME augmented myogenic autoregulation, and subsequent BQ-788 did not alter this response. However, BQ-788 infused alone also enhanced myogenic autoregulation but resulted in significant impairment of myogenic autoregulation by subsequent L-NAME. Thus the interaction between nitric oxide and endothelin is clearly nonadditive and, because it is asymmetrical, cannot be explained simply by convergence on a common signal pathway. Instead one must postulate some degree of hierarchical organization and that nitric oxide acts downstream to endothelin B activation.

myogenic mechanism; dynamics; L-NAME; BQ-788

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