索马托斯塔丁表达内部神经元通过GABAb受体以突触特异的方式调节新皮质网络
Dominik Kanigowski1, Karolina Bogaj1, Alison L Barth2
1Laboratory of Electrophysiology, Nencki Institute of Experimental Biology, Warsaw, 02-093, Poland.
Scientific reports
|May 31, 2023
概括
索马托斯坦素表达抑制神经元 (SST-INs) 使用GABA-B受体来减少它们自己的刺激输入,从而创建一个负反循环. 这种调制在SST-IN和帕瓦胺表达内部神经元 (PV-IN) 之间有所不同.
科学领域:
- 神经科学是一个神经科学.
- 细胞神经科学 细胞神经科学
- 突触性可塑性 突触性可塑性
背景情况:
- 索马托斯坦素表达抑制神经元 (SST-INs) 通过GABAa和GABAb受体调节皮质网络活动.
- 存在潜在的负反循环,SST-INs可能通过GABAb受体 (GABA-BRs) 抑制自身.
研究的目的:
- 为了研究GABA-BR调节对小鼠体感皮质SST-IN活性的影响.
- 为了比较GABA-BR激活对SST-INs的影响与表达帕瓦胺内部神经元 (PV-INs) 的影响.
主要方法:
- 在实验室中,在小鼠体感皮层 (二/三层) 中记录了全细胞补丁.
- 药理学和光遗传学操纵以调节GABA-BR活性.
- 神经元发射活动和突触传播的表征.
主要成果:
- 通过前突触GABA-BRs来抑制SST-INs的刺激驱动;后突触GABA-BRs没有影响.
- SST-INs调节在金字塔神经元-金字塔神经元 (Pyr-Pyr) 和金字塔神经元-SST-IN (Pyr-SST) 突触中的激发性突触强度.
- 在网络活动期间在PV-IN上GABA-BR的激活不是由SST-IN发射驱动的,这表明差分调制.
结论:
- 通过GABA-BRs,SST-INs建立了一个通过GABA-BRs来控制自身激发的先突触负面反机制.
- SST-INs对自身和其他内部神经元类型 (PV-INs) 不同调节激发性突触输入.
- 这项研究强调了GABA-BR信号传导在调节不同新皮层内部神经元群体中的独特作用.
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