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(Hypertension. 1996;27:119-124.)
© 1996 American Heart Association, Inc.

Articles

Blunted Pressure Natriuresis in Ovariectomized Dahl-Iwai Salt-Sensitive Rats

Keiichi Otsuka; H. Suzuki; T. Sasaki; N. Ishii; H. Itoh; T. Saruta

From the Department of Internal Medicine, School of Medicine, Keio University, Tokyo (K.O., H.S., T. Sasaki, T. Saruta), and the Department of Clinical Chemistry, School of Hygienic Sciences, Kitasato University, Kanagawa (N.I., H.I.), Japan.

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

Abstract Our objective was to determine whether increased salt sensitivity after menopause precedes the development of overt hypertension. We investigated the effect of ovariectomy on pressure natriuresis in Dahl-Iwai salt-sensitive (DS) and salt-resistant (DR) rats by in vivo perfusion studies. Differences in the neural and hormonal backgrounds of the kidney were minimized by renal denervation and by holding plasma vasopressin, aldosterone, corticosterone, and norepinephrine levels constant by intravenous infusion. The pressure-natriuresis relationship was blunted in DS rats compared with DR rats (slope, 0.30 versus 0.63 µmol·min^-1·g kidney wt^-1·mm Hg^-1, P<.01). The impaired pressure-natriuresis response of DS rats was further blunted by ovariectomy (from 0.30 to 0.14 µmol·min^-1·g kidney wt^-1·mm Hg^-1, P<.05), and that of DR rats was not. The ovariectomized DS rats developed hypertension earlier than sham-operated DS rats by salt loading. These results show that ovariectomy enhances genetic salt sensitivity by blunting the pressure-natriuresis relationship, which precedes the development of overt hypertension in female DS rats.

Key Words: rats, Dahl • ovariectomy • hypertension, sodium-dependent • salt sensitivity • pressure-natriuresis

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