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在突触处Rem2与CaMKII相互作用,并限制海马体的长期增强

Rabia Anjum¹, Vernon R J Clarke², Yutaro Nagasawa^3,4

¹Department of Biology and Volen Center for Complex Systems, Brandeis University, Waltham, Massachusetts 02454, United States of America.

bioRxiv : the preprint server for biology

|April 1, 2024

概括

GTPase Rem2 抑制了 CaMKII,这是学习和记忆中的关键酶. 雷米2淘汰会增强长期潜能 (LTP),这表明雷米2可以作为突触可塑性的车.

科学领域:

神经科学是一个神经科学.
分子生物学分子生物学
突触性可塑性突触性可塑性

背景情况:

突触可塑性,神经元连接的加强或削弱,是学习和记忆的基础.
/卡尔莫杜林依赖蛋白激酶II (CaMKII) 对于诱导像长期强化 (LTP) 这样的突触可塑性形式至关重要.
此前,GTPase Rem2 已被确定为内源性 CaMKII 抑制剂.

研究的目的:

研究Rem2在调节突触可塑性的体内作用.
为了确定Rem2是否直接抑制突触中的CaMKII活性.
为了阐明Rem2在海马中的功能.

主要方法:

产生Rem2条件淘汰 (cKO) 的小鼠.
长期潜能 (LTP) 在海马片中的电生理学记录.
在cKO小鼠中,野生型 (WT) 和突变Rem2的重新表达.
2光子光终身成像显微镜-福斯特共振能量转移 (2pFLIM-FRET) 来评估蛋白质相互作用.

主要成果:

雷米2淘汰赛显著增强了沙弗尔对CA1突触的抵押的LTP.
重新表达WT Rem2挽救了增强的LTP表型.
无法抑制CaMKII的Rem2突变体的表达未能拯救LTP.
已经证明,CaMKII和Rem2在树突中相互作用.

结论:

Rem2通过抑制CaMKII活动,作为过度突触强化的生理制动剂.
这项研究揭示了Rem2在CaMKII功能的负调节中的新作用.
在树突中Rem2与CaMKII的相互作用对于调节突触可塑性至关重要.

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