相关实验视频
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Published on: February 15, 2015
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皮质激素通过背上条纹体的可塑性相关基因表达加速行为不灵活性
Michael D Murphy1, Keegan S Krick1, Shuo Zhang2
1Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania, Philadelphia, PA, USA.
概括
慢性压力激素皮质 (CORT) 通过改变大脑中的基因表达来损害行为灵活性. 这项研究揭示了CORT诱导的纹状体表观遗传变化,影响突触可塑性并导致不灵活的行为.
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
- 行为科学 行为科学
背景情况:
- 行为灵活性对于适应不断变化的环境至关重要,由背中条体 (DMS) 调节.
- 行为不灵活,以自动性为特征,由背侧条纹体 (DLS) 促进.
- 慢性压力,通过皮质类固醇 (CORT),通过影响DMS和DLS中的树突结构来损害灵活性.
研究的目的:
- 为了研究基因表达的变化背后的CORT诱导的行为不灵活性.
- 在DMS和DLS中定义CORT介导的表观遗传修饰.
- 探索这些分子反应中的性别特异性差异.
主要方法:
- 在雄性和雌性小鼠中利用了食物激发的操作任务.
- 在DMS和DLS中分析了基因表达和拼接模式.
- 进行了表观遗传分析,特别是检查了H3K9ac丰富.
主要成果:
- 科尔特暴露减少了DMS中的突触可塑性基因表达,并在DLS中增加了它.
- 在过渡到不灵活的过程中确定了不同的差异表达和拼接基因.
- 在两条纹子区域中,根据性别分层,揭示了CORT驱动的H3K9ac丰富特征.
结论:
- 通过在DMS和DLS中的基因表达和拼接的特定改变,CORT加速了行为灵活性的丧失.
- 表观遗传机制,包括H3K9ac修饰,在CORT对条状基因调节的影响中起着重要作用.
- 这项研究提供了第一份关于在向不灵活行为的转变期间,在条形体中由CORT驱动的表观遗传调节的综合性观点.
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