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RENAL HEMODYNAMICS AND CARDIORENAL INTEGRATION

Angiotensin II response in afferent arterioles of mice lacking either the endothelial or neuronal isoform of nitric oxide synthase

¹Institute of Vegetative Physiology, University-Hospital Charité, Humboldt-University of Berlin, Berlin, Germany; ²Department of Medical Cell Biology, Biomedical Center, Uppsala University, Sweden; ³Institute of Pathology, Neuropathology, and Molecular Pathology, Hannover, Germany; and ⁴Department of Internal Medicine I, Marienhospital Herne, Ruhr-University Bochum, Herne, Germany

Submitted 5 July 2007 ; accepted in final form 18 October 2007

The aim of the study is to evaluate the impact of nitric oxide (NO) produced by endothelial NO synthase (eNOS) and neuronal NOS (nNOS) on the angiotensin II response in afferent arterioles (Af). Dose responses were assessed for angiotensin II in microperfused Af of mice homozygous for disruption of the eNOS gene [eNOS(–/–)], or nNOS gene [nNOS(–/–)], and their wild-type controls, eNOS(+/+) and nNOS(+/+). Angiotensin II at 10^–8 and 10^–6 mol/l reduced the lumen to 69% and 68% in eNOS(+/+), and to 59% and 50% in nNOS(+/+). N^G-nitro-L-arginine methyl ester (L-NAME) did not change basal arteriolar diameters, but augmented angiotensin II contraction, reducing diameters to 23% and 13% in eNOS(+/+), and 7% and 10% in nNOS(+/+) at 10^–8 and 10^–6 mol/l. The response to angiotensin II was enhanced in nNOS(–/–) mice (41% and 25% at 10^–8 and 10^–6 mol/l) and even more enhanced in eNOS(–/–) mice (12% and 9%) compared with nNOS(+/+) and eNOS(+/+). L-NAME led to complete constriction of Af in these groups. Media-to-lumen ratios of Af did not differ between controls and gene-deficient mice. mRNA expression of angiotensin II receptor types 1A and 1B and type 2 also did not differ. The results reveal that angiotensin II-induced release of NO from both eNOS and nNOS significantly contributes to the control of Af. Results also suggest that eNOS-derived NO is of greater importance than nNOS-derived NO in this isolated arteriolar preparation.

renin-angiotensin system; eNOS knockout; nNOS knockout; N^G-nitro-L-arginine methyl ester; renal hemodynamics; juxtaglomerular apparatus

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