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综合应激反应效应器GADD34被神经元重新利用,以促进刺激诱导的翻译
Mauricio M Oliveira1, Muhaned Mohamed1, Megan K Elder1
1Center for Neural Science, New York University, New York, NY, USA.
Cell reports
|January 14, 2024
概括
神经元使用GADD34蛋白来促进新的蛋白质合成,这对长期记忆和大脑可塑性至关重要. 这个过程是由来自大脑的神经营养因子 (BDNF) 触发的,涉及到真核生物启动因子2α (eIF2α) 的脱酸化.
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
- 细胞生物学 细胞生物学
背景情况:
- 神经元蛋白质合成对于长期的突触可塑性和记忆巩固至关重要.
- 欧核细胞启动因子2α (eIF2α) 的脱化是一种关键的调节事件,增强了对记忆的蛋白质合成.
- 大脑衍生神经营养因子 (BDNF) 的刺激会触发增加蛋白质合成的信号通路.
研究的目的:
- 研究将BDNF刺激与eIF2α脱酸化和增加蛋白质合成联系起来的分子机制.
- 确定GADD34在中介神经元中BDNF诱导的翻译控制中的作用.
主要方法:
- 主要动物神经元用BDNF进行治疗.
- 测量了GADD34翻译的水平.
- 评估了GADD34和actin动态对eIF2α脱和蛋白质合成的要求.
- 分析了BDNF诱导的突触可塑性蛋白的翻译在GADD34的存在和缺席的情况下.
主要成果:
- 刺激BDNF增加了GADD34在初级神经元中的翻译.
- GADD34促进了eIF2α脱,并增强了新的蛋白质合成.
- 在去化eIF2α和促进蛋白质合成方面,GADD34的功能取决于由cofilin产生的G-actin.
- GADD34对于参与突触可塑性的蛋白质的BDNF诱导翻译至关重要.
结论:
- 神经元利用GADD34,通常是一个集成的应激反应效应器,来调节eIF2-依赖的翻译.
- 作为快速蛋白质合成的关键调解者,GADD34在对像BDNF这样的可塑性诱导刺激的反应中起作用.
- 这些发现揭示了GADD34在突触可塑性和记忆形成中的新作用.
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