Inhibition of the 5-HT1A receptor-mediated inwardly rectifying K+ current by dextromethorphan in rat dorsal raphe neurones

Inhibition of the 5-HT1A receptor-mediated inwardly rectifying K+ current by dextromethorphan in rat dorsal raphe neurones
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右美沙芬对大鼠中缝背神经元5-HT1A受体介导的内向整流K电流的抑制作用

DOI:
10.1016/s0028-3908(00)00092-7
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发表时间:
2000
期刊:
影响因子:
4.7
通讯作者:
K. Takahama
K. Takahama
中科院分区:
医学2区
文献类型:
--
作者:
H. Ishibashi;Kouichi Kuwano;K. Takahama

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在电压钳条件下,使用制霉菌素穿孔贴片和常规全细胞贴片记录配置,研究了右美沙芬 (DM) 对大鼠中缝背侧 (DR) 神经元急性分离中 5-HT1A 受体介导的内向整流 K+ 电流的影响。 DM 以浓度依赖性方式快速、可逆地抑制 10−7M 5-HT 诱导的 K+电流,半数抑制浓度为 1.43×10−5M。 DM 的抑制作用既不依赖于电压也不依赖于使用。 DM 导致 5-HT 浓度-反应曲线的最大反应受到抑制,因此表明是非竞争性抑制类型。在用含有不可水解的 GTP 类似物 GTPγS 的移液管溶液进行细胞内灌注的神经元中,5-HT 以不可逆的方式激活 K+ 电流。即使在没有激动剂的情况下,DM 也会抑制细胞内 GTPγS 不可逆激活的电流。 DM 还抑制新鲜分离的大鼠蓝斑神经元中由 α2-肾上腺素受体调节的内向整流 K+ 电流。这些结果表明,DM 可能会抑制中枢神经系统中与内向整流 K+ 通道偶联的 G 蛋白,但不会抑制神经递质受体。
The effect of dextromethorphan (DM) on the inwardly rectifying K+currents mediated by 5-HT1Areceptors in acutely dissociated dorsal raphe (DR) neurones of rats was studied using nystatin-perforated patch and conventional whole-cell patch recording configurations under voltage-clamp conditions. DM rapidly and reversibly inhibited the K+currents induced by 10−7M 5-HT in a concentration-dependent manner with a half-maximum inhibitory concentration of 1.43×10−5M. The inhibitory effect of DM was neither voltage- nor use-dependent. DM caused a suppression of the maximum response of the 5-HT concentration–response curve, thus suggesting a non-competitive type of inhibition. In neurones perfused intracellularly with a pipette-solution containing the nonhydrolyzable GTP analog GTPγS, 5-HT activated K+currents in an irreversible manner. DM suppressed the current irreversibly activated by intracellular GTPγS even in the absence of the agonist. DM also inhibited the inwardly rectifying K+currents regulated by α2-adrenoceptors in freshly isolated rat locus coeruleus neurones. These results suggest that DM may inhibit the G-protein coupled inwardly rectifying K+channels, but not the neurotransmitter receptors, in the central nervous system.
体外中缝背神经元中电压和配体激活的内向整流电流。
DOI: 10.1523/jneurosci.08-09-03499.1988
发表时间: 1988
期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子: --
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发表时间: 1996
期刊: Journal of neurophysiology.
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