内源性阿片类药物系统调节人类大脑中的近端和远端威胁信号
Kerttu Seppälä1,2, Vesa Putkinen3, Harri Harju3
1Turku PET Centre, and Turku University Hospital, University of Turku, Turku, Finland. kaasep@utu.fi.
Molecular psychiatry
|December 24, 2025
概括
人类的阿片类系统,特别是μ-阿片类受体 (MORs),在调节急性恐惧反应方面发挥着关键作用. 在恐惧期间增加的MOR结合表明它参与调节大脑活动并抑制威胁反应.
科学领域:
- 神经科学是一个神经科学.
- 心理学 心理学 心理学
- 药理学 药理学是指药理学的学科.
背景情况:
- 恐惧对生存至关重要,触发了战斗或逃跑反应.
- 内源性阿片类系统调节压力和疼痛,但其在人类急性恐惧中的作用尚不清楚.
研究的目的:
- 研究μ-阿片类受体 (MOR) 系统在人类急性恐惧中的参与.
- 在实验诱导的恐惧过程中描述大脑的血液动力学和阿片类系统反应.
主要方法:
- 功能性磁共振成像 (fMRI) 和用[11C]carfentanil的正子发射断层扫描 (PET) 用于测量大脑活动和MOR结合.
- 试验对象接触到蛇 (威胁) 或植物 (安全),以引起恐惧.
- 瞳孔测量和自我报告评估了主观恐惧和自主兴奋.
主要成果:
- 蛇接触激活了脑干防御回路,丘脑,注意力和运动区域,在重复时反应减弱.
- 与安全性相比,在恐惧期间观察到加大[11C]卡芬坦尼尔与MORs的结合.
- 急性威胁反应是由带带状回形和丘脑的基线MOR结合调节的,较高的基线MOR声调预测了缓和的反应.
结论:
- 急性恐惧涉及脑干和运动电路的激活,由MOR系统调节.
- 通过MORs,阿片类药物系统在调节和抑制人类恐惧反应方面发挥着重要作用.
- 这些发现突出了MORs作为人类恐惧反应的关键调节器.
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