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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Pharmacological studies on the 'orphan' opioid receptor in central and peripheral sites.
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Pharmacological studies on the 'orphan' opioid receptor in central and peripheral sites.

机译:中枢和外周部位“孤儿”阿片受体的药理研究。

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We have exploited the availability of the "orphan" opioid receptor (referred to here as ORL1) in its "natural state" to investigate the effect of nociceptin (orphanin FQ), the endogenous agonist for the ORL1 receptor in the brain, vas deferens, and myenteric plexus of the small intestine. Nociceptin was a potent agonist in electrically stimulated preparations of vasa deferentia (rat and rabbit) and myenteric plexus (guinea-pig) (IC50 ranging from 18 to 31 nM) and susceptible to enzymic cleavage as addition of a cocktail of peptidase inhibitors to the organ bath produced a leftward shift in concentration-response curves (IC50 ranging from 2.1 to 4.9 nM). In radioligand binding experiments using brain membranes from rat, rabbit, and guinea-pig, [3H]nociceptin bound a single population of binding sites with high affinity (KD values ranging from 0.049 to 0.124 nM) and capacity (Bmax ranging from 143 to 254 fmol.mg-1 protein). However, the response to nociceptin in functional studies and in radioligand binding inhibitory assays was resistant to antagonism/displacement by naloxone and a range of other opioid receptor antagonists, thus displaying a very different pharmacological profile from that of the "classical" opioids. Therefore, we conclude that the effect of nociceptin in these studies is not via an action at mu, delta, or kappa opioid receptors but rather at an orphan opioid receptor, ORL1.
机译:我们已经研究了“孤儿”阿片类药物受体(此处称为ORL1)在其“自然状态”下的可用性,以研究伤害性感受器诺西普汀(orphanin FQ)的作用,后者是脑内ORL1受体,血管输精管的内源性激动剂,和小肠的肌间神经丛。 Nociceptin是电刺激的输卵管(大鼠和兔子)和肌间神经丛(豚鼠)(IC50范围为18至31 nM)的强效激动剂,在向器官中添加肽酶抑制剂混合物后易于酶解。镀液在浓度-响应曲线上向左移动(IC50范围从2.1到4.9 nM)。在使用大鼠,兔和豚鼠的脑膜进行的放射性配体结合实验中,[3H] nociceptin以高亲和力(KD值在0.049至0.124 nM之间)和容量(Bmax在143至254之间)结合了单个结合位点fmol.mg-1蛋白)。但是,在功能研究和放射性配体结合抑制试验中,对伤害感受肽的反应对纳洛酮和其他一系列阿片受体拮抗剂的拮抗作用/置换具有抗性,因此显示出与“经典”阿片类药物非常不同的药理作用。因此,我们得出结论,在这些研究中,伤害感受肽的作用不是通过对mu,δ或kappa阿片受体的作用,而是对孤儿阿片受体ORL1的作用。

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