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CXCL12 激活皮质抑制神经元来增强树突脊柱的可塑性和结构化网络活动
Chunta Ho1,2, Jared Luchetta1,2, Bradley Nash1
1Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102.
概括
化学因子CXCL12,通过它的受体CXCR4,促进皮质神经元中的新树突脊柱形成和成熟. 这种信号通路增强神经元网络活动和突触可塑性.
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:
- 化学因子CXCL12 (C-X-C动机化学因子连接体12) 对于大脑平衡至关重要.
- 通过其受体CXCR4发送信号的CXCL12会影响皮层神经元中的树突脊柱密度.
- 这一途径在神经HIV模型中显示出扭转认知缺陷的潜力.
研究的目的:
- 调查CXCL12是否调节树状脊柱的周转,成熟和聚类.
- 确定CXCL12对神经网络活动的影响.
- 阐明CXCR4在抑制神经元中的作用,以及CXCL12对刺激神经元的影响.
主要方法:
- 原始老鼠皮层神经元被培养并用CXCL12进行治疗.
- 活细胞成像和共聚焦显微镜被用来分析树突性脊柱动态.
- 多电极阵列评估了神经网络活动;CXCR4是通过敲击目标的.
主要成果:
- CXCL12显著增加了新的脊柱形成,这种效应被CXCR4抗剂AMD3100阻止.
- CXCL12增强了表达 postsynaptic标记物 (PSD-95,p-PSD-95,GluA1) 的细脊柱的密度,并保持了PSD-95的点尺寸.
- CXCL12增加了网络爆发的尖峰频率,并促进了脊柱聚类;抑制神经元中的CXCR4敲击阻止了CXCL12对刺激神经元的影响.
结论:
- CXCL12/CXCR4信号积极促进树突脊柱的形成,成熟和集群.
- 这种化学激素途径通过对刺激神经元和抑制神经元的影响来调节神经元网络活动.
- CXCL12信号传输是大脑突触可塑性和网络功能的关键调节者.
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