福斯科林逆转了O-GlcNAcylation依赖于GABAAR在海马突触的电流幅度的减少,可能是在GABAARs上的神经类固醇部位
Shekinah Phillips1, John C Chatham1, Lori L McMahon2
1University of Alabama at Birmingham.
Research square
|April 25, 2024
概括
增加的O-GlcNAcylation通过揭示海马细胞中抑制后突触电流的神经类强化来增强GABAergic传播.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- GABAergic传输是通过像酸化一样的翻译后修饰 (PTMs) 调节的.
- O-GlcNAcylation是一种涉及O-链 β-N-乙糖胺的PTM,此前已被证明可以抑制GABAergic电流.
- 在调节GABAergic信号传递方面,O-GlcNAcylation和酸化之间的相互作用仍然不清楚.
研究的目的:
- 研究O-GlcNAcylation和血清酸化在调节GABAergic抑制后突触电流 (IPSCs) 中的相互作用.
- 为了确定O-GlcNAcylation是否影响GABAergic传输对福斯科林和神经类固醇等调节剂的敏感性.
主要方法:
- 在海马主要细胞中IPSCs的电生理记录.
- 药物学操纵以增加O-GlcNAcylation水平. 药物学操纵以增加O-GlcNAcylation水平.
- 福斯科林的应用,以增加血清酸化.
- 在不同O-GlcNAcylation状态下评估神经类固醇效应 (THDOC,孕激素).
主要成果:
- 升高的O-GlcNAcylation在与福斯科林结合时逆转了它对eIPSCs自身的抑郁作用,表明了增强相互作用.
- 福斯科林的增强作用独立于腺酸环酶和蛋白激酶A,表明非酸化机制.
- 增加的O-GlcNAcylation揭示了神经类固醇 (THDOC,孕激素) 对eIPSC振幅的增强作用.
结论:
- 增加的O-GlcNAcylation促进了神经类固醇对突触抑制的强化.
- 这表明,在增加O-GlcNAcylation的条件下,突触GABAA受体上的神经类固醇结合部位变得可访问.
- 在调节GABAergic信号传递的可塑性方面,O-GlcNAcylation起着至关重要的作用.
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