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NMDA receptors in nucleus tractus solitarii are linked to soluble guanylate cyclase

¹Department of Neurology, University of Iowa and Department of Veterans Affairs Medical Center, Iowa City, Iowa 52242; and ²Department of Biological Sciences/Núcleo de Pesquisas em Ciências Biológicas Universidade Federal de Ouro Preto, Minas Gerais, Brazil

Submitted 17 March 2003 ; accepted in final form 4 December 2003

We sought to test the hypothesis that cardiovascular responses to activation of ionotropic, but not metabotropic, glutamate receptors in the nucleus tractus solitarii (NTS) depend on soluble guanylate cyclase (sGC) and that inhibition of sGC would attenuate baroreflex responses to changes in arterial pressure. In adult male Sprague-Dawley rats anesthetized with chloralose, the ionotropic receptor agonists N-methyl-D-aspartate (NMDA) and DL--amino-3-hydroxy-5-methylisoxazole-propionic acid (AMPA) and the metabotropic receptor agonist trans-DL-amino-1,3-cyclopentane-dicarboxylic acid (ACPD) were microinjected into the NTS before and after microinjection of sGC inhibitors at the same site. Inhibition of sGC produced significant dose-dependent attenuation of cardiovascular responses to NMDA but did not alter responses produced by injection of AMPA or ACPD. Bilateral inhibition of sGC did not alter arterial pressure, nor did it attenuate baroreflex responses to pharmacologically induced changes in arterial pressure. This study links sGC with NMDA, but not AMPA or metabotropic, receptors in cardiovascular signal transduction through NTS.

baroreflex; ionotropic receptor

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