迷幻5-HT2A受体激应:神经元特征和改变的神经血管合
bioRxiv : the preprint server for biology
|November 28, 2024
概括
像DOI这样的迷幻药物会改变神经血管合 (NVC),影响大脑成像信号. 这些效应,特别是在休息期间,突显了需要考虑在迷幻研究中的血管活性.
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.
- 医疗成像医学成像
背景情况:
- 迷幻药对情绪障碍具有治疗潜力,神经成像研究指出了依赖于血清素-2A受体 (5-HT2AR) 的大脑重组.
- 然而,在迷幻神经成像的背景下,人们在很大程度上忽视了血清激素的血管活性特性.
- 已被证明,psilocybin可以改变人类的功能磁共振成像 (fMRI) 血动力学反应 (HRF),这表明它可能对神经血管合 (NVC) 有影响.
研究的目的:
- 调查迷幻5-HT2AR激动剂2,5-Dimethoxy-4-iodoamphetamine (DOI) 对神经元活动,血液动力学和NVC的影响.
- 通过在清醒的小鼠中使用广场光学成像 (WFOI) 在刺激唤起和静止状态条件下评估这些效应.
- 确定NVC变化是否依赖于5-HT2AR活性,以及它们是否影响静止状态功能连接 (RSFC).
主要方法:
- 在清醒的Thy1-jRGECO1a小鼠中利用广场光学成像 (WFOI) 来同时测量神经元 () 和血液动力活动.
- 使用了2,5-Dimethoxy-4-iodoamphetamine (DOI),一种5-HT2AR激动剂,及其对手MDL100907.7.
- 分析了刺激引起和静止状态的条件,以评估NVC和RSFC的变化.
主要成果:
- DOI部分改变了基于任务的NVC,在静止状态条件下观察到更明显的变化,特别是在协会地区.
- 在DOI下,神经元和血液动力学信号为静止状态功能连接 (RSFC) 变化提供了不同的解释.
- 同时服用DOI和5-HT2AR抗剂MDL100907可以逆转许多观察到的NVC和RSFC变化.
结论:
- 像DOI这样的迷幻5-HT2AR激动剂显著影响神经血管合 (NVC),影响fMRI测量的血液动力学反应.
- 在DOI下,神经元和血液动力学信号之间的分离强调了考虑迷幻诱导的神经血管效应的重要性.
- 未来的神经成像研究解释血氧水平依赖 (BOLD) 信号在迷幻药的背景下必须考虑他们的强大的血管活性特性.
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