从中介性橄耳神经元中同时释放GABA和ACH,调整耳间异抑制的微调
Tais Castagnola1, Valeria C Castagna2, Siân R Kitcher3
1Instituto de Investigaciones en Ingeniería Genética y Biología Molecular, "Dr. Héctor N. Torres", Consejo Nacional de Investigaciones Científicas y Técnicas, (1428) Ciudad Autónoma de Buenos Aires, Argentina.
bioRxiv : the preprint server for biology
|August 26, 2024
概括
在听觉发育过程中,中间橄耳神经元 (MOC) 协同释放GABA和乙胆 (ACh),以调节内毛细胞 (IHC) 活动. GABA作为负反作用,调节听力突触发育时的胆固醇抑制.
科学领域:
- 神经科学是一个神经科学.
- 审计系统开发 审计系统开发
- 突触性可塑性 突触性可塑性
背景情况:
- 内毛细胞 (IHCs) 在发育过程中表现出自发活动.
- 中间橄耳 (MOC) 效应器暂时刺激IHCs,这对听觉通路的发展至关重要.
- MOC-IHC突触是胆性,但GABA信号标记物存在.
研究的目的:
- 在MOC-IHC突触中调查GABA的来源.
- 在IHC发育过程中确定GABAergic信号的功能作用.
- 探索从MOC终端共释放神经递质的过程.
主要方法:
- 在GAD;ChR2-eYFP和ChAT;ChR2-eYFP小鼠中,对胆固醇和GABAergicMOC纤维的光遗传刺激.
- 在IHC中对突触电流的电生理学记录.
- 光学神经递质检测和成像.
- 使用α-毒素和CGP 36216 (GABABR抗剂) 的药理学阻塞.
主要成果:
- 光遗传刺激唤起了α-bungarotoxin阻断的电流,这表明ACH释放激活了nAChRs.
- MOC胆能纤维与GABA共释放,由GABABR对手研究证实.
- GABAergic调制显示异质性,影响15/31记录的突触部位.
- GABA作为负反作用,调节胆固醇抑制.
结论:
- GABA和乙胆 (ACh) 从MOC终端的一个子集共释放.
- GABA作为局部负反机制起作用.
- 这种联合释放调节了胆固醇抑制在发展异性-IHC突触.
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