胰岛素增强了老鼠岛皮层中快速激增和金字塔神经元之间的抑制性突触电流
Yuka Nakaya1, Satoshi Kosukegawa2, Satomi Kobayashi3
1Department of Pharmacology, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8310, Japan; Division of Oral and Craniomaxillofacial Research, Dental Research Center, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8310, Japan.
Neuropharmacology
|July 2, 2023
概括
胰岛素通过增加抑制性神经元的发射速度和促进大鼠岛皮层中的抑制性后突触电流 (IPSCs) 来增强大脑功能. 这种调节涉及PI3-K/Akt通路,这表明胰岛素在神经抑制中发挥了作用.
科学领域:
- 神经科学是一个神经科学.
- 细胞电生理学 细胞电生理学
- 分子信号传输的方法
背景情况:
- 胰岛素对神经发育和可塑性等大脑功能至关重要.
- 它在电生理学调制中的作用,特别是在大脑皮层中,仍未得到充分研究.
- 胰岛素信号失调与神经系统疾病 (如痴呆症和抑郁症) 有关.
研究的目的:
- 为了研究胰岛素如何调节大鼠岛皮层中的神经活动和抑制后突触电流 (IPSCs).
- 阐明胰岛素对抑制神经元的影响所涉及的特定细胞机制和信号通路.
主要方法:
- 在大鼠岛皮层 (IC) 中使用了全细胞补丁记录.
- 研究了胰岛素对快速升的GABAergic神经元 (FSN) 和它们与金字塔神经元 (PNs) 的连接的影响.
- 研究了信号通路的参与,包括PI3-K/Akt和MAPK,使用特定的抑制剂和受体对抗剂.
主要成果:
- 胰岛素增加了FSN的燃烧速率并降低了FSN的值潜力,而不会改变静止膜潜力或输入电阻.
- 胰岛素增强的GABAergic单元IPSCs (uIPSCs) 从FSN转移到PNS,以剂量依赖的方式.
- 增强的uIPSC与降低的配对脉冲比率有关,这表明预突触GABA释放增加,得到了微型IPSC数据的支持.
- 胰岛素的作用通过PI3-K/Akt途径进行调解,而不是铁酶酶或MAPK途径.
结论:
- 胰岛素通过增强FSN刺激性和增加GABA释放到PNS,促进岛屿皮层的神经抑制.
- PI3-K/Akt信号通路对于胰岛素对GABAergic神经递质的调节作用至关重要.
- 这些发现强调了胰岛素在调节皮质网络活动和抑制过程中的重要作用.
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