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
复制标题
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
影响因子:
4.7
通讯作者:
K. Takahama
中科院分区:
文献类型:
--
作者:
H. Ishibashi;Kouichi Kuwano;K. Takahama
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.
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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:
--
作者:
Williams,JT;Colmers,WF;Pan,ZZ
通讯作者:
Pan,ZZ
影响因子:
6.1
作者:
Klein,M;Musacchio,JM
通讯作者:
Musacchio,JM
DOI:
10.1152/jn.1996.76.2.799
发表时间:
1996
期刊:
Journal of neurophysiology.
影响因子:
--
作者:
Singer,JH;Bellingham,MC;Berger,AJ
通讯作者:
Berger,AJ
影响因子:
3.6
作者:
Craviso,GL;Musacchio,JM
通讯作者:
Musacchio,JM