GABA agonists and omega conotoxin GVIA modulate responses to nerve activation of the perfused rat mesentery.

GABA agonists and omega conotoxin GVIA modulate responses to nerve activation of the perfused rat mesentery.
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GABA 激动剂和 omega 芋螺毒素 GVIA 调节对灌注大鼠肠系膜神经激活的反应。

DOI:
10.1016/0024-3205(91)90270-l
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发表时间:
1991
期刊:
影响因子:
6.1
通讯作者:
Duckles,SP
Duckles,SP
中科院分区:
医学2区
文献类型:
--
作者:
Li,YJ;Duckles,SP

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研究了γ-氨基丁酸(GABA)受体激动剂和ω- concontoxin GVIA (CTX)对交感神经和感觉神经的调节作用,并对经壁神经刺激(TNS)大鼠肠系膜的收缩反应进行了观察。GABA和选择性GABA受体激动剂巴氯芬可以显著抑制血管收缩剂对TNS的反应,而选择性GABA受体激动剂muscimol则没有作用。在胍乙啶治疗和甲氧苄胺收缩的肠系膜中,TNS引起血管扩张反应,而GABA不受影响。CTX(10−8M)明显抑制血管收缩剂对TNS的反应,但不影响血管舒张剂的反应。这些结果表明,在大鼠肠系膜中:(1)GABA受体通过前结GABA受体调节交感神经的活动,但不影响感觉神经;(2)参与交感神经激活的钙通道与辣椒素敏感的感觉神经中的钙通道具有不同的性质。
The modulatory actions of γ-aminobutyric acid (GABA) receptor agonists and ω-conotoxin GVIA (CTX) on sympathetic and sensory nerves were examined on contractile responses of the perfused rat mesentery to transmural nerve stimulation (TNS). GABA and baclofen, a selective GABABreceptor agonist, significantly inhibited vasoconstrictor responses to TNS, while muscimol, a selective GABAAreceptor agonist, had no effect. In the guanethidine treated and methoxamine-contracted mesentery, TNS caused a vasodilator response which was unaffected by GABA. CTX (10−8M) markedly suppressed the vasoconstrictor response to TNS, but did not affect vasodilator responses. These findings suggest that in the rat mesentery: (1) GABA receptors modulate the activity of sympathetic nerves via prejunctional GABABreceptors, but do not influence sensory nerves, and (2) calcium channels which participate in sympathetic nerve activation have different properties than calcium channels in capsaicin-sensitive sensory nerves.
ω-芋螺毒素 GVIA 对各组织自主神经效应器传递的影响
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