Laboratory Investigation

Kidney International (1993) 43, 205–211; doi:10.1038/ki.1993.33

Role of NO on pressure-natriuresis in Wistar-Kyoto and spontaneously hypertensive rats

Hideki Ikenaga, Hiromichi Suzuki, Naohito Ishii, Hajime Itoh and Takao Saruta

Department of Internal Medicine, School of Medicine, Keio University, Tokyo, and Department of Clinical Chemistry, School of Hygienic Sciences, Kitasato University, Kanagawa, Japan

Correspondence: Takao Saruta MD, Department of Internal Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinuku-ku, Tokyo, 160, Japan.

Received 15 April 1992; Revised 11 August 1992; Accepted 13 August 1992.

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Abstract

Role of NO on pressure-natriuresis in Wistar-Kyoto and spontaneously hypertensive rats. We investigated the role of the endothelium-derived relaxing factor nitric oxide (NO) on pressure-natriuresis in spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY) using in vivo perfusion studies. Differences in the neural and hormonal background to the kidney were minimized by renal denervation and by holding plasma vasopressin, aldosterone, corticosterone, and norepinephrine levels constant by intravenous infusion. In WKY, elevation of renal perfusion pressure (RPP) from 115 to 157 mm Hg increased urinary sodium excretion 4.5 to 14.8 microEq/min/g kidney wt, and the slope of its linear regression was 0.21 microEq/min/g kidney wt/mm Hg. Infusion of an inhibitor of NO synthase, l-NMMA (1 mg/min/kg), lowered this slope (P < 0.05) but l-arginine (3 mg/min/kg) did not change it. By contrast, the impaired pressure-natriuresis response of SHR was ameliorated by l-arginine (slope: 0.08 to 0.16; P < 0.05), while l-NMMA did not blunt it further. GFR and renal plasma flow (RPF) were well autoregulated in both strains, but l-NMMA lowered RPF significantly (SHR: from 4.2 to 2.6 ml/min/g kidney wt; WKY: 4.5 to 2.5 ml/min/g kidney wt). Moreover, when infused simultaneously, all these individual effects of l-NMMA and l-arginine were nullified. These results suggest that NO plays an important role in the pressure-natriuresis mechanism.

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