Effect of nitric oxide on excitatory amino acid-evoked discharge of neurons in NTS

Effect of nitric oxide on excitatory amino acid-evoked discharge of neurons in NTS

Author Dias, ACR Google Scholar
Colombari, E. Google Scholar
Mifflin, S. W. Google Scholar
Institution Univ Texas
Universidade Federal de São Paulo (UNIFESP)
Abstract N-methyl-D-aspartate (NMDA) and non-NMDA excitatory amino acid (EAA) receptor subtypes are involved in the integration of visceral afferent inputs within the nucleus of the solitary tract (NTS). Microinjection studies indicate interactions between nitric oxide (NO) and EAA receptors within the NTS. To examine these interactions at the single cell level, this study characterized the effects of the NO synthase inhibitor N-G-nitro-L-arginine methyl ester (L-NAME) and the NO donor 3-[2-hydroxy-2-nitroso-1-propylhydrazino]-1-propanamine (PAPA-NONOate) on the excitatory responses of vagus nerve (VN)-evoked NTS neurons to the activation of (RS)-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) and NMDA receptors in rats. Iontophoresis of L-NAME did not alter spontaneous or VN-evoked discharges, but significantly decreased the number of action potentials (APs) evoked by iontophoretic application of AMPA. the effects of L-NAME on NMDA-evoked discharge were variable; for the population, L-NAME did not change the number of APs evoked by NMDA. PAPA-NONOate enhanced the spontaneous discharge and the number of APs elicited by AMPA but not NMDA. Iontophoresis of the inactive enantiomers N-G-nitro-D-arginine methyl ester and hydroxydiazenesulfonic acid 1-oxide disodium salt had no effect on AMPA-evoked discharge. Our data suggest that NO facilitates AMPA-mediated neuronal transmission within the NTS.
Keywords nucleus of the solitary tract
N-methyl-D-aspartate
(RS)-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid
vagus nerve stimulation
Language English
Date 2003-01-01
Published in American Journal of Physiology-heart and Circulatory Physiology. Bethesda: Amer Physiological Soc, v. 284, n. 1, p. H234-H240, 2003.
ISSN 0363-6135 (Sherpa/Romeo, impact factor)
Publisher Amer Physiological Soc
Extent H234-H240
Origin http://dx.doi.org/10.1152/ajpheart.00037.2002
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000179857900028
URI http://repositorio.unifesp.br/handle/11600/27082

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