Contribution to sympathetic vasomotor tone of tonic glutamatergic inputs to neurons in the RVLM.
Contribution to sympathetic vasomotor tone of tonic glutamatergic inputs to neurons in the RVLM.
复制标题
RVLM 神经元强直性谷氨酸能输入对交感血管舒缩张力的贡献。
DOI:
10.1152/ajpregu.00255.2004
复制
发表时间:
2004
期刊:
影响因子:
--
通讯作者:
R. Dampney
中科院分区:
文献类型:
--
作者:
J. Horiuchi;S. Killinger;R. Dampney
The role of excitatory amino acid (EAA) receptors in the rostral ventrolateral medulla (RVLM) in maintaining resting sympathetic vasomotor tone remains unclear. It has been proposed that EAA receptors in the RVLM mediate excitatory inputs both to presympathetic neurons and to interneurons in the caudal ventrolateral medulla (CVLM), which then provide a counterbalancing inhibition of RVLM presympathetic neurons. In this study, we tested this hypothesis by determining the effect of blockade of EAA receptors in the RVLM on mean arterial pressure (MAP), heart rate (HR), and renal sympathetic nerve activity (RSNA), after inhibition of CVLM neurons. In anesthetized rats, bilateral injections of muscimol in the CVLM increased MAP, HR, and RSNA. Subsequent bilateral injections of kynurenic acid (Kyn, 2.7 nmol) in the RVLM caused a modest reduction of approximately 20 mmHg in the MAP but had no effect, when compared with the effect of vehicle injection alone, on HR or RSNA. By approximately 50 min after the injections of Kyn or vehicle in the RVLM, the MAP had stabilized at a level close to its original baseline level, but the HR and RSNA stabilized at levels above baseline. The results indicate that removal of tonic EAA drive to RVLM neurons has little effect on the tonic activity of RVLM presympathetic neurons, even when inputs from the CVLM are blocked. Thus the tonic activity of RVLM presympathetic neurons under these conditions is dependent on excitatory synaptic inputs mediated by non-EAA receptors and/or the autoactivity of these neurons.
DOI:
10.1152/ajpregu.1987.252.4.r699
发表时间:
1987
期刊:
The American journal of physiology
影响因子:
--
作者:
Sun,MK;Guyenet,PG
通讯作者:
Guyenet,PG
DOI:
10.1152/ajpregu.1985.249.6.r672
发表时间:
1985
期刊:
The American journal of physiology
影响因子:
--
作者:
Sun,MK;Guyenet,PG
通讯作者:
Guyenet,PG
影响因子:
8.3
作者:
Ito, S;Komatsu, K;Sved, AF
通讯作者:
Sved, AF