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(Hypertension. 2007;50:354.)
© 2007 American Heart Association, Inc.

Original Articles

Increased Dietary Salt Enhances Sympathoexcitatory and Sympathoinhibitory Responses From the Rostral Ventrolateral Medulla

Julye M. Adams; Christopher J. Madden; Alan F. Sved; Sean D. Stocker

From the Department of Physiology (J.M.A., S.D.S.), University of Kentucky, Lexington; Neurological Sciences Institute (C.J.M.), Oregon Health Science University, Beaverton; and the Department of Neuroscience (A.F.S.), University of Pittsburgh, Pa.

Correspondence to Sean D. Stocker, Department of Physiology, University of Kentucky, 800 Rose St MS-508, Lexington, KY 40536-0298. E-mail sean.stocker{at}uky.edu

Increased dietary salt exaggerates arterial blood pressure (ABP) responses evoked from the rostral ventrolateral medulla (RVLM). The present study determined whether these enhanced pressor responses were directly attributable to a greater increase in sympathetic nerve activity (SNA) and whether these enhanced responses were balanced by a greater responsiveness of RVLM neurons to inhibitory input. Male Sprague-Dawley rats were fed normal chow and given access to either water or a 1% NaCl solution for 14 days. Injection of L-glutamate (0.03, 0.1, 1.0, and 3.0 nmol) into the RVLM produced a significantly greater increase in renal SNA, splanchnic SNA, and ABP in rats drinking 1% NaCl versus water. Conversely, injection of the inhibitory amino acid -aminobutyric acid (0.1, 1.0, and 10 nmol) into the RVLM produced significantly greater decreases in renal SNA, splanchnic SNA, and ABP of rats drinking 1% NaCl versus water. These enhanced SNA and ABP responses to L-glutamate and -aminobutyric acid were not observed in rats drinking 1% NaCl for 1 or 7 days but were present in rats drinking 1% NaCl for 21 days. Moreover, the dietary salt-induced enhancement of both sympathoexcitatory and sympathoinhibitory responses from the RVLM persisted after the 1% NaCl solution was replaced with water for 1, but not 7, days. These findings indicate that the potentiated ABP responses observed previously are mediated by parallel changes in SNA, and these responses depend on a slowly developing and reversible form of neuronal plasticity.

Key Words: sympathetic nervous system • blood pressure • glutamate • GABA • sodium chloride

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