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Different GABA-receptor types are involved in the 5-HT-induced antinociception at the spinal level: a behavioral study.

机译:在脊髓水平上,5-HT诱导的抗伤害感受涉及不同的GABA受体类型:一项行为研究。

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摘要

The effects of intrathecally (i.t.) administered GABA(A)-receptor antagonist picrotoxin or bicuculline on the antinociception produced by i.t. serotonin (5-HT), gamma-aminobutyric acid (GABA), muscimol--the GABA(A) agonist or baclofen--the GABA(B) agonist were investigated and compared using the tail-flick assay in rats. The results showed that 1) both i.t. picrotoxin (1.5 nmol) and i.t. bicuculline (0.5 nmol) exhibited a partial and later-emerged blockade on the antinociception produced by 5-HT (120 nmol) or GABA (1.5 nmol); 2) both i.t. picrotoxin and i.t. bicuculline, with the same dosages, completely blocked the antinociception produced by muscimol (1.0 nmol), but showed no effects on that produced by baclofen (0.3 nmol). The results suggest that GABA may mediate the 5-HT-induced antinociception at the spinal level, with the GABA(B)-receptors exhibiting the effect at the early-stage and the GABA(A)-receptors at the later stage of the 5-HT-induced antinociception.
机译:鞘内(i.t.)施用GABA(A)-受体拮抗剂苦瓜毒素或双瓜氨酸对i.t.产生的抗伤害感受的作用。使用大鼠甩尾法研究并比较了5-羟色胺(5-HT),γ-氨基丁酸(GABA),麝香酚-GABA(A)激动剂或巴氯芬-GABA(B)激动剂。结果表明1)两者都微毒素(1.5 nmol)和i.t. Bicuculline(0.5 nmol)对5-HT(120 nmol)或GABA(1.5 nmol)产生的抗伤害感受具有部分和后来出现的阻滞作用; 2)两者都是微毒素和i.t.相同剂量的双瓜氨酸完全阻断了麝香酚(1.0 nmol)产生的镇痛作用,但对巴氯芬(0.3 nmol)产生的镇痛作用没有影响。结果表明,GABA可能在脊髓水平介导5-HT诱导的抗伤害感受,其中GABA(B)受体在5的早期表现出作用,而GABA(A)受体在5的后期表现出作用。 -HT诱导的抗伤害感受。

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