亚板和6b层神经元的分子亚型的特定功能连接性
Minzi Chang1, Zheng Xu1, Sophia Nehs1
1Department of Biomedical Engineering, School of Medicine Johns Hopkins University, Baltimore, MD 21205, United States.
概括
亚板神经元 (SpNs) 显示出多样化的功能电路,与分子身份没有直接联系. 抑制性连接随着年龄的增长而变化,突出显示皮质电路形成中的发育可塑性.
科学领域:
- 神经科学是一个神经科学.
- 发育神经科学的发展神经科学.
- 计算神经科学是一种神经科学.
背景情况:
- 亚板神经元 (SpNs) 对于早期皮质电路发育至关重要,其中一些作为6b层神经元持续到成年.
- SpN显示分子多样性,但分子身份和功能/连接性质之间的相关性仍然不太清楚.
- 了解SpN的发展和连接是破译成熟皮质网络形成的关键.
研究的目的:
- 研究SPN亚群中分子身份和功能性皮质内电路之间的关系.
- 描述影响SpN的功能电路的发展轨迹.
- 为了确定不同的SPN分子类是否表现出不同的发育途径和连接模式.
主要方法:
- 在小鼠模型中使用了SpN特定的Cre线 (CTGF-dgCre和Drd1-Cre).
- 在初级听觉皮层的急性大脑切片中进行了全细胞补丁录音和激光扫描光刺激.
- 检查了三个发育阶段:P7-P9 (听觉前),P14-P20 (听觉后发作) 和P60-P80 (成人).
主要成果:
- 刺激性皮质内电路在整个发育过程中显示出CTGF和Drd1 SpN亚型的类似模式.
- 抑制电路,特别是来自子板/层6b的抑制电路,在SpN亚型之间存在显著差异,并且随着年龄的增长而变化.
- 在P7-P9时,Drd1神经元比CTGF神经元受到更强的亚板抑制;到成年时,从6b层到CTGF神经元的抑制连接增加.
- 此外,SPN表现出多样化的神经元形态和输入模式,在很大程度上独立于它们的分子身份,这种多样性在成年后会增加.
结论:
- 分子身份不能完全预测子板神经元中的功能连接或形态.
- 抑制电路的发育修剪和成熟显著影响了SpN连接.
- 亚板神经元的不同分子类别与不同的功能电路配置不相关,这表明分子类型内的功能多样性.
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