重复暴露于吗啡可逆地损害了奥雷克辛神经元的功能上不同的亚群中的尖端生成和重复发射
Elizabeth A Berry1, Ellen N Huhulea1, Masaru Ishibashi2
1Department of Physiology, New York Medical College, Valhalla, New York 10595.
概括
长期暴露于吗啡会损害奥雷克辛神经元的刺激能力,特别是在H型神经元中,影响药物依赖. 这表明在阿片类药物成中发生了改变的素释放.
科学领域:
- 神经科学是一个神经科学.
- 神经药理学神经药理学
- 细胞电生理学 细胞电生理学
背景情况:
- 氨酸 (低氨酸) 神经对于调节睡眠-清醒周期和奖励处理至关重要.
- 奥雷克辛神经元对药物线索做出反应,并在慢性药物使用时经历结构变化,可能会影响成.
- 阿片类药物依赖与改变的素神经元形态有关,但对神经元发射和释放的影响尚不清楚.
研究的目的:
- 调查慢性吗啡暴露对素神经元内在电生理学特性的影响.
- 为了确定慢性阿片类药物治疗是否会改变素神经元的兴奋和发射模式.
- 探索吗啡对不同素神经元亚群的差异性影响.
主要方法:
- 在雄性小鼠的素-EGFP神经元上进行了全细胞电生理记录.
- 小鼠每天用吗啡或盐水治疗两周.
- 评估了内在的电生理学特性,包括动作潜能特征和发火增益.
主要成果:
- 每日用吗啡治疗减少了奥雷克辛神经元的体积,但在"H型"神经元的亚群中悖论地降低了兴奋能力.
- "D型"素神经元不受吗啡治疗的影响.
- 刺激能力受损包括更小,更广泛的动作潜力,可变的发射和减少的发射增益,在停药四周后正常化.
结论:
- 长期暴露于吗啡会对素神经元亚型产生不同的影响,从而损害H型神经元的刺激能力.
- 这些电生理学变化表明,在阿片类药物依赖期间,H型素神经元的突触输入编码和神经释放能力受损.
- 这些发现提供了关于阿片类药物成和依赖的基础的神经生物学机制的见解.
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