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Angiotensin II infusion restores stimulated angiogenesis in the skeletal muscle of rats on a high-salt diet. Am J Physiol Heart Circ Physiol 2006 Jul;291(1):H114-20 PMID: 16461372

Abstract

Elevated dietary salt intake has previously been demonstrated to have dramatic effects on microvascular structure and function. The purpose of this study was to determine whether a high-salt diet modulates physiological angiogenesis in skeletal muscle. Male Sprague-Dawley rats were placed on a control diet (0.4% NaCl by weight) or a high-salt diet (4.0% NaCl) before implantation of a chronic electrical stimulator. After seven consecutive days of unilateral hindlimb muscle stimulation, animals on control diets demonstrated a significant increase in microvessel density in the tibialis anterior muscle of the stimulated hindlimb relative to the contralateral control leg. High salt-fed rats demonstrated a complete inhibition of this angiogenic response, as well as a significant reduction in plasma ANG II levels compared with those of control animals. To investigate the role of ANG II suppression on the inhibitory effect of high-salt diets, a group of rats that were fed high salt were chronically infused with ANG II at a low dose. Maintenance of ANG II levels restored stimulated angiogenesis to control levels in animals fed a high-salt diet. Western blot analysis indicated that inhibition of angiogenesis in high salt-fed rats was not due to changes in VEGF or VEGF receptor type 1 protein expression in response to stimulation; however, the degree to which VEGF receptor 2 protein increased with stimulation was significantly lower in high salt-fed animals. This study demonstrates an inhibitory effect of high salt intake on stimulated angiogenesis and suggests a critical role for ANG II suppression in mediating this antiangiogenic effect.

Author List

Petersen MC, Munzenmaier DH, Greene AS

Author

Andrew S. Greene PhD Interim Vice Chair, Chief, Professor in the Biomedical Engineering department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Angiogenesis Inducing Agents
Angiogenesis Inhibitors
Angiotensin II
Animals
Dose-Response Relationship, Drug
Drug Combinations
Male
Muscle, Skeletal
Neovascularization, Physiologic
Rats
Rats, Sprague-Dawley
Sodium Chloride, Dietary



View this publication's entry at the Pubmed website PMID: 16461372
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