Autonomic processing of the cardiovascular reflexes in the nucleus tractus solitarii

被引:55
作者
Machado, BH
Mauad, H
Chianca, DA
Haibara, AS
Colombari, E
机构
[1] UNIV FED ESPIRITO SANTO,CTR BIOMED,DEPT CIENCIAS FISIOL,BR-29040090 VITORIA,ES,BRAZIL
[2] UNIV FED OURO PRETO,DEPT CIENCIAS BIOL,BR-35400000 OURO PRETO,MG,BRAZIL
[3] UNIV FED SAO PAULO,ESCOLA PAULISTA MED,DEPT FISIOL,BR-04023060 SAO PAULO,SP,BRAZIL
关键词
L-glutamate; excitatory amino acid receptors; NMDA receptors; baroreflex; chemoreflex; Bezold-Jarisch reflex; AP-5; kynureic acid;
D O I
10.1590/S0100-879X1997000400015
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The nucleus tractus solitarii (NTS) receives afferent projections from the arterial baroreceptors, carotid chemoreceptors and cardiopulmonary receptors and as a function of this information produces autonomic adjustments in order to maintain arterial blood pressure within a narrow range of variation. The activation of each of these cardiovascular afferents produces a specific autonomic response by the excitation of neuronal projections from the NTS to the ventrolateral areas of the medulla (nucleus ambiguus, caudal and rostral ventrolateral medulla). The neurotransmitters at the NTS level as well as the excitatory amino acid (EAA) receptors involved in the processing of the autonomic responses in the NTS, although extensively studied, remain to be completely elucidated, In the present review we discuss the role of the EAA L-glutamate and its different receptor subtypes in the processing of the cardiovascular reflexes in the NTS. The data presented in this review related to the neurotransmission in the NTS are based on experimental evidence obtained in our laboratory in unanesthetized rats. The two major conclusions of the present review are that a) the excitation of the cardiovagal component by cardiovascular reflex activation (chemo- and Bezold-Jarisch reflexes) or by L-glutamate microinjection into the NTS is mediated by N-methyl-D-aspartate (NMDA) receptors, and b) the sympatho-excitatory component of the chemoreflex and the presser response to L-glutamate microinjected into the NTS are not affected by an NMDA receptor antagonist, suggesting that the sympatho-excitatory component of these responses is mediated by non-NMDA receptors.
引用
收藏
页码:533 / 543
页数:11
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