The novel micro-opioid receptor antagonist, [N-allyl-Dmt(1)]endomorphin-2, attenuates the enhancement of GABAergic neurotransmission by ethanol.
The novel micro-opioid receptor antagonist, [N-allyl-Dmt(1)]endomorphin-2, attenuates the enhancement of GABAergic neurotransmission by ethanol.
复制标题
新型微阿片受体拮抗剂 [N-烯丙基-Dmt(1)]endomorphin-2 可减弱乙醇对 GABA 能神经传递的增强作用。
DOI：
10.1093/alcalc/agn085
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Swartzwelder,HS
中科院分区：
文献类型：
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作者：
Li,Qiang;Okada,Yoshio;Marczak,Ewa;Wilson,WilkieA;Lazarus,LawrenceH;Swartzwelder,HS
Aims:We investigated the effects of [N-allyl-Dmt1]endomorphin-2 (TL-319), a novel and highly potent μ-opioid receptor antagonist, on ethanol (EtOH)-induced enhancement of GABAAreceptor-mediated synaptic activity in the hippocampus.Methods:Evoked and spontaneous inhibitory postsynaptic currents (eIPSCs and sIPSCs) were isolated from CA1 pyramidal cells from brain slices of male rats using whole-cell patch-clamp techniques.Results:TL-319 had no effect on the baseline amplitude of eIPSCs or the frequency of sIPSCs. However, it induced a dose-dependent suppression of an ethanol-induced increase of sIPSC frequency with full reversal at concentrations of 500 nM and higher. The non-specific competitive opioid receptor antagonist naltrexone also suppressed EtOH-induced increases in sIPSC frequency but only at a concentration of 60 μM.Conclusion:These data indicate that blockade of μ-opioid receptors by low concentrations of [N-allyl-Dmt1]endomorphin-2 can reverse ethanol-induced increases in GABAergic neurotransmission and possibly alter its anxiolytic or sedative effects. This suggests the possibility that high potency opioid antagonists may emerge as possible candidate compounds for the treatment of ethanol addiction.
