葡萄糖皮质体受体调节中枢杏仁体GABAergic突触在马奇吉亚-撒丁岛酒精偏爱的老鼠
Sophia Khom1,2, Vittoria Borgonetti1, Valentina Vozella1
1Department of Molecular Medicine, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.
Neurobiology of stress
|August 7, 2023
概括
中枢杏仁体 (CeA) 中增强的葡萄糖皮质体受体 (GR) 活性通过增加GABA传输驱动酒精使用障碍 (AUD). 在msP大鼠中阻断GR减少了这种信号,突出了GRGR.
科学领域:
- 神经科学是一个神经科学.
- 内分泌学 在内分泌学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 酒精使用障碍 (AUD) 涉及下丘脑-垂体-上腺 (HPA) 轴功能障碍和中枢桃体 (CeA) 葡萄糖皮质体受体 (GR) 活性升高.
- 像米菲普里斯一样,GR对抗作用减少了AUD渴望和酒精消费,并降低了依赖性大鼠的CeA GABAergic传播.
- 在偏爱酒精的雄性msP大鼠中注意到CeA GR活性升高,但其在高GABA传输和后依赖表型中的作用尚不清楚.
研究的目的:
- 研究GR基因转录 (Nr3c1) 在雄性和雌性msP和Wistar大鼠CeA中的作用.
- 检查GR抗剂米费普里斯顿单独或与乙醇一起对CeAGABAergic传播的急性影响.
- 确定CeA中增强的GR功能是否有助于AUD中的不适应性行为.
主要方法:
- 在现场杂交,以量化男性和女性msP和Wistar大鼠CeA中的Nr3c1基因转录.
- 现体切片电生理学记录自发抑制后突触电流 (sIPSCs) 和唤起抑制后突触潜能 (eIPSPs) 在CeA.
- 药理学评估米费普里斯顿 (10微米) 和乙醇 (44微米) 对CeAGABAergic传播的影响.
主要成果:
- 雌性大鼠表现出比雄性更高的CeA GR表达,表明性别二态GR调节.
- 米菲普里斯降低了msP大鼠 (两性) 的CeA sIPSC频率和eIPSP幅度,但没有降低Wistar大鼠的CeA sIPSC频率和eIPSP幅度,这表明msP大鼠的内在活性GR.
- 米菲普里斯并没有阻断男性msp大鼠中乙醇诱导的CeA GABA传播的急性增加.
结论:
- 在msP大鼠中,GR本质上调节基底CeAGABAergic信号传递,有助于它们的表型.
- 在CeA中增强的GR功能是AUD中不适应性行为背后的一个关键机制.
- 在GR表达的性别差异表明在AUD病变发生过程中存在不同的调节途径.
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