一种外周受限的大麻素受体激动剂在炎症和神经病理性疼痛的啮齿动物模型中产生强大的抗伤害感受效应。

A peripherally restricted cannabinoid receptor agonist produces robust anti-nociceptive effects in rodent models of inflammatory and neuropathic pain.

机构信息

AstraZeneca R&D Montréal, 7171 Frédérick-Banting, Ville Saint-Laurent, Québec, Canada H4S 1Z9 McGill Centre for Research on Pain, McGill University, 3655 Promenade Sir William Osler, Montréal, Québec, Canada H3G 1Y6 Department of Pharmacology & Experimental Therapeutics, McGill University, 3655 Promenade Sir William Osler, Montréal, Québec, Canada H3G 1Y6.

出版信息

Pain. 2010 Nov;151(2):337-344. doi: 10.1016/j.pain.2010.07.019. Epub 2010 Aug 8.

Abstract

Cannabinoids are analgesic in man, but their use is limited by their psychoactive properties. One way to avoid cannabinoid receptor subtype 1 (CB1R)-mediated central side-effects is to develop CB1R agonists with limited CNS penetration. Activation of peripheral CB1Rs has been proposed to be analgesic, but the relative contribution of peripheral CB1Rs to the analgesic effects of systemic cannabinoids remains unclear. Here we addressed this by exploring the analgesic properties and site of action of AZ11713908, a peripherally restricted CB1R agonist, in rodent pain models. Systemic administration of AZ11713908 produced robust efficacy in rat pain models, comparable to that produced by WIN 55, 212-2, a CNS-penetrant, mixed CB1R and CB2R agonist, but AZ11713908 generated fewer CNS side-effects than WIN 55, 212-in a rat Irwin test. Since AZ11713908 is also a CB2R inverse agonist in rat and a partial CB2R agonist in mouse, we tested the specificity of the effects in CB1R and CB2R knock-out (KO) mice. Analgesic effects produced by AZ11713908 in wild-type mice with Freund's complete adjuvant-induced inflammation of the tail were completely absent in CB1R KO mice, but fully preserved in CB2R KO mice. An in vivo electrophysiological assay showed that the major site of action of AZ11713908 was peripheral. Similarly, intraplantar AZ11713908 was also sufficient to induce robust analgesia. These results demonstrate that systemic administration of AZ11713908, produced robust analgesia in rodent pain models via peripheral CB1R. Peripherally restricted CB1R agonists provide an interesting novel approach to analgesic therapy for chronic pain.

摘要

大麻素在人类中具有镇痛作用,但由于其精神活性,其应用受到限制。避免大麻素受体亚型 1 (CB1R) 介导的中枢副作用的一种方法是开发穿透中枢神经系统能力有限的 CB1R 激动剂。激活外周 CB1R 被认为具有镇痛作用,但系统大麻素的镇痛作用中外周 CB1R 的相对贡献尚不清楚。在这里,我们通过探索 AZ11713908(一种外周受限的 CB1R 激动剂)在啮齿动物疼痛模型中的镇痛特性和作用部位来解决这个问题。AZ11713908 全身给药在大鼠疼痛模型中产生了强大的疗效,与穿透中枢神经系统的混合 CB1R 和 CB2R 激动剂 WIN 55,212-2 相当,但 AZ11713908 在大鼠 Irwin 测试中引起的中枢神经系统副作用比 WIN 55,212 少。由于 AZ11713908 在大鼠中也是 CB2R 反向激动剂,在小鼠中是部分 CB2R 激动剂,我们在 CB1R 和 CB2R 敲除 (KO) 小鼠中测试了这些效应的特异性。在野生型小鼠中,用完全弗氏佐剂诱导尾部炎症时,AZ11713908 产生的镇痛作用在 CB1R KO 小鼠中完全消失,但在 CB2R KO 小鼠中完全保留。体内电生理测定表明,AZ11713908 的主要作用部位是外周。同样,足底内注射 AZ11713908 也足以诱导强烈的镇痛作用。这些结果表明,AZ11713908 全身给药通过外周 CB1R 在啮齿动物疼痛模型中产生了强大的镇痛作用。外周受限的 CB1R 激动剂为慢性疼痛的镇痛治疗提供了一种有趣的新方法。

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