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(Hypertension. 2003;41:1012.)
© 2003 American Heart Association, Inc.

Rapid Communication

Skeletal Muscle Arteriolar Reactivity in SS.BN13 Consomic Rats and Dahl Salt-Sensitive Rats

From the Department of Physiology, Medical College of Wisconsin, Milwaukee, Wis.

Correspondence to Julian H. Lombard, PhD, Department of Physiology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226. E-mail jlombard{at}mcw.edu

Previous studies have demonstrated that angiotensin II is a crucial factor in maintaining normal vascular reactivity. In this study, we tested the hypothesis that altered reactivity to vasoactive stimuli in Dahl salt-sensitive (S) rats on a high salt diet could be prevented by introgression of chromosome 13 from the normotensive Brown Norway strain, which carries a normally functioning renin gene. Dahl S and consomic SS.BN13 rats were fed a low salt (0.4%) or high salt diet (4%) for 4 to 6 days or 4 weeks. Arteriolar responses to elevated superfusion solution PO₂, acetylcholine, and sodium nitroprusside were assessed by videomicroscopy in the cremaster muscle. Arteriolar dilation to sodium nitroprusside was normal in both strains. Arteriolar constriction to elevated PO₂ was enhanced in Dahl S and SS.BN13 rats on a high salt diet compared with responses in rats on a low salt diet. Arterioles of Dahl S rats on a high salt diet had an impaired dilation to acetylcholine, whereas dilator responses to acetylcholine were restored in SS.BN13 rats regardless of elevated salt intake. These data suggest that (1) restitution of normal renin control mechanisms by chromosomal transfer contributes to the recovery of dilator responses in SS.BN13 rats versus Dahl S rats but does not affect constrictor responses to oxygen, and (2) factors in the Dahl S genetic background contribute to an enhanced sensitivity of arterioles to elevated PO₂ independent of elevated blood pressure.

Key Words: hypertension, renal • microcirculation • autoregulation • sodium • oxygen • genetics • hypertension, essential

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