Extracellular H+ iontophoresis modifies responses to gamma-aminobutyric acid and cyanide of reticulospinal vasomotor neurons in rats.

Extracellular H+ iontophoresis modifies responses to gamma-aminobutyric acid and cyanide of reticulospinal vasomotor neurons in rats.
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细胞外H离子电渗疗法改变大鼠网状脊髓血管运动神经元对γ-氨基丁酸和氰化物的反应。

DOI:
10.1016/0014-2999(93)90603-f
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发表时间:
1993
影响因子:
5
通讯作者:
Reis,DJ
Reis,DJ
中科院分区:
医学2区
文献类型:
--
作者:
Sun,MK;Reis,DJ

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在麻醉大鼠延髓腹外侧网状核记录到网状脊髓血管神经元对γ-氨基丁酸(GABA)和氰化物微电泳的反应。细胞外H+离子导入减弱GABA诱发的神经元活动的减少和增强氰化物诱导的神经元活动的增加,但单独应用时对神经元活动没有影响。在OH−离子电渗期间产生相反的反应。在H+和OH−离子电渗期间,也观察到甘氨酸诱发的这些神经元抑制的类似效应,这表明GABA诱发的抑制的H+调制可能不是由GABA受体通道复合物的特定作用引起的。结果表明,细胞外H+离子对网状脊髓血管神经元对其他神经活性物质的反应具有调节作用,可能对缺氧缺血性心血管调节有重要作用。
Responses of reticulospinal vasomotor neurons, recorded in the rostral ventrolateral reticular nucleus of the medulla oblongata, to γ-aminobutyric acid (GABA) and cyanide microiontophoreses were examined during H+iontophoresis in anesthetized rats. Extracellular H+iontophoresis attenuated GABA-evoked decreases and enhanced cyanide-induced increases in the neuronal activity, but had no effect on the neuronal activity when applied alone. Opposite responses were produced during OH−iontophoresis. Similar effects were also observed on the glycine-evoked inhibition of these neurons during H+and OH−iontophoreses, suggesting that H+modulation of the GABA-evoked inhibition may not result from a specific action at the GABA receptor-channel complex. It is concluded that extracellular H+ions exert a modulatory action on responses of the reticulospinal vasomotor neurons to other neuro-active substances and may significantly contribute to hypoxic-ischemic cardiovascular regulation.
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DOI: --
发表时间: 1974
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