在小鼠耳中,听觉非干性神经元和II型螺旋性链非干性神经元之间的GABAergic突触
Julia L Bachman1, Siân R Kitcher1, Lucas G Vattino2
1Section on Neuronal Circuitry, NIH, National Institute on Deafness and Other Communication Disorders, Bethesda, MD 20892.
概括
中间橄耳神经元 (MOC) 将GABA释放到II型螺旋质神经元 (SGN),激活GABAA受体 (GABAARs). 这种GABAergic突触在耳功能和神经反中发挥作用.
科学领域:
- 神经科学是一个神经科学.
- 听觉生理学 听觉生理学
- 细胞生物学 细胞生物学
背景情况:
- 耳外毛细胞 (OHC) 对于听觉灵敏度和通过电动性调节频率至关重要.
- 中间橄耳 (MOC) 神经元,主要是胆固醇,抑制OHCs,影响耳收益和保护.
- MOC神经元也表达GABA,这表明它在胆固醇抑制之外发挥了更广泛的作用,GABAB自身受体已知能调节乙胆释放.
研究的目的:
- 调查大中的GABAergic活动的全部程度,特别关注MOC不同的终端.
- 确定GABA从MOC轴突释放的机制以及GABAA受体 (GABAARs) 的位置和功能.
- 阐明GABA从MOC神经元释放到II型螺旋质神经元 (SGN) 的后突触点和功能影响.
主要方法:
- 利用光学神经递质检测来监测神经递质释放.
- 采用免疫组织化学来确定关键蛋白质和受体的局部.
- 进行了补丁电生理学,以记录和分析神经元活动和突触传播.
主要成果:
- 证明了MOC不同的终端除了乙胆外还释放GABA.
- 鉴定了GABAA受体 (GABAARs) 在II型SGN的 afferent树突上,调解了后突触反应.
- 证实了在MOC终端上的突触前GABAB自身受体的激活,调节了乙胆的释放.
结论:
- MOC的异端端形成了一种新的GABAergic突触与II型SGN,由GABAA受体 (GABAARs) 介导.
- 这种GABAergic信号可能参与发育过程,微调OHC活动,并向大脑提供听觉反.
- 这些发现扩大了我们对耳外系统复杂性及其在听觉处理和平衡中的作用的理解.
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