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大麻素CB1受体和片受体的相互作用:从条件淘汰赛小鼠的新见解

Hannah Alton¹, Emily Linz¹, Guo-Hua Bi¹

¹Addiction Biology Unit, Molecular Targets and Medications and Discovery Branch, National Institute on Drug Abuse Intramural Research Program, Baltimore, MD, USA.

Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology

|September 25, 2025

概括

大麻素CB1受体和片受体不会直接相互作用以增强疼痛缓解. 它们的综合效应很可能源于单独的神经元类型的激活,而不是共同定位.

科学领域:

神经科学是一个神经科学.
药理学药理学是指药理学的学科.
疼痛研究疼痛研究

背景情况:

同时服用大麻素和阿片类药物会增强镇痛效果.
这种协同作用背后的精确分子机制在很大程度上是未知的.
一个普遍的假设涉及大麻素CB1受体 (CB1R) 和片受体 (MOR) 之间的直接相互作用.

研究的目的:

为了研究直接CB1R-MOR相互作用的假设.
为了检查小鼠大脑中CB1R和MOR的局部化模式.
评估删除一个受体对另一个受体反应的功能影响.

主要方法:

用于mRNA分布分析的RNA范围 in situ杂交.
在Vglut2-阳性谷氨酸和Vgat-阳性GABAergic神经元中选择性遗传删除MOR.
在GABAergic神经元中选择性基因删除CB1R.
行为评估包括镇痛,低温,催眠症,运动运动活动,和有条件的地方偏好/厌恶.

主要成果:

CB1R和MORmRNA显示了不同的区域分布.
在Vglut2-阳性神经元 (~50%) 内的胸膜 (PVT) 的偏心室核中发现了显著的CB1R-MOR mRNA同位化.
在其他与疼痛和奖励相关的大脑区域观察到有限的局部化.
删除MOR或CB1R并没有改变它们各自的配体或同时使用的药物的行为效应.
在Vglut2或Vgat神经元中,MOR删除没有影响Δ9-四大麻 (Δ9-THC) 的效应.
氧化的效应不受GABAergic神经元中CB1R删除的影响.

结论:

这些发现不支持CB1R和MOR的直接相互作用模型.
结合使用大麻素和阿片类药物的增强止痛作用可能来自于不同神经元群体或电路的并行激活.
这表明替代机制,如下游信号融合或电路级调制,调解协同效应.

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