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首页> 外文期刊>Pain. >Treatment of chronic allodynia in spinally injured rats: effects of intrathecal selective opioid receptor agonists.
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Treatment of chronic allodynia in spinally injured rats: effects of intrathecal selective opioid receptor agonists.

机译:脊髓损伤大鼠的慢性异常性疼痛的治疗:鞘内选择性阿片受体激动剂的作用。

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We examined the effects of intrathecal (i.t.) selective opioid receptor agonists in alleviating mechanical and cold allodynia in spinally injured rats. Both DAMGO ([D-Ala2,N-Me-Phe4,Gly5-ol]-enkephalin, a mu-opioid receptor agonist) and DPDPE ([D-Phe2,D-Phe5]-enkephalin, a delta-opioid receptor agonist) dose-dependently relieved the chronic allodynia-like behavior at doses selective for their respective receptors. The anti-allodynic effect of DAMGO and DPDPE was reversed by the selective mu- and delta-opioid receptor antagonists CTOP (D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2) and naltrindole, respectively. In contrast, the selective kappa-opioid receptor agonist U50488H did not alleviate the allodynia-like behavior, but rather enhanced it. The anti-nociceptive and anti-allodynic effect of i.t. DAMGO was blocked by U50488H. Thus, activation of spinal mu- and delta-, but not kappa-opioid receptors produced anti-allodynic effect in this model of central pain. Drugs which act selectively on opioid receptor subtypes may be useful in managing chronic central pain of spinal cord origin.
机译:我们研究了鞘内(i.t.)选择性阿片受体激动剂在减轻脊髓损伤大鼠的机械性和冷性异常性疼痛中的作用。 DAMGO([D-Ala2,N-Me-Phe4,Gly5-ol]-脑啡肽,μ阿片受体激动剂)和DPDPE([D-Phe2,D-Phe5]-脑啡肽,δ阿片受体激动剂)剂量依赖性地减轻了对它们各自受体具有选择性的剂量下的慢性异常性疼痛样行为。 DAMGO和DPDPE的抗痛觉过敏作用分别被选择性的mu和delta类阿片受体拮抗剂CTOP(D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2)逆转。 。相反,选择性κ-阿片受体激动剂U50488H并未减轻痛觉异常样的行为,反而增强了它。 i.t.的抗伤害感受和止痛作用DAMGO被U50488H阻止。因此,在这种中枢性疼痛模型中,激活脊髓mu和delta受体而不激活kappa受体产生抗痛觉过敏作用。选择性作用于阿片受体亚型的药物可用于治疗脊髓起源的慢性中枢性疼痛。

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