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Am J Physiol Heart Circ Physiol 278: H500-H506, 2000;
0363-6135/00 $5.00
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Vol. 278, Issue 2, H500-H506, February 2000

Elevated salt intake impairs dilation of rat skeletal muscle resistance arteries via ANG II suppression

David S. Weber and Julian H. Lombard

Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226

Vasodilator responses were assessed in resistance arteries (100-200 µm) isolated from the gracilis muscle of normotensive rats after changes in dietary salt intake. Sprague-Dawley rats were maintained on either a high-salt (HS) diet (4.0% NaCl) or a low-salt (LS) diet (0.4% NaCl) for 4-8 wk (chronic) or 3 days (short-term) with water ad libitum. One group of short-term HS rats received a continuous intravenous infusion of a low dose (5 ng · kg-1 · min-1) of ANG II to prevent the ANG II suppression that occurs with HS diet. Short-term and chronic HS diet eliminated arterial dilation in response to ACh and reduced PO2 (30-40 mmHg) and the stable prostacyclin analog iloprost. ANG II infusion preserved the response to these vasodilator stimuli in short-term HS animals. Dilator responses to sodium nitroprusside and forskolin were unaffected by HS diet. These findings suggest that ANG II suppression during HS diet impairs vascular relaxation mechanisms upstream from the cAMP and cGMP second messenger systems.

angiotensin II; sodium; vascular smooth muscle; microcirculation; vascular relaxation


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