Molecular Analysis of AMPA Receptor Signaling in NG2 Glial Cells

NG2神经胶质细胞由一群离散的中枢神经系统大胶质细胞组成，接受神经元的突触输入。这种神经-神经胶质传递的生理意义仍然难以捉摸。在这里，我们假设NG2细胞中由AMPA亚型谷氨酸受体(AMPAR)介导的快速兴奋性突触信号是NG2细胞增殖及其异质性谱系进展为少突胶质细胞或其他细胞类型的关键决定因素。利用无偏倚的蛋白质组学方法，我们建议分析和功能表征天然NG2细胞中AMPAR信号的分子设计与它们的发育阶段和它们在脑中的定位。下一步，已识别的NG2细胞特异性AMPAR复合体成分，定义了受体的运输和门控特性，将被原位干扰，以描述它们在神经胶质细胞通讯中的功能。研究结果有望成为理解谷氨酸能信号与NG2细胞生物学相关性的关键。

NG2 glial cells comprise a discrete population of CNS macroglia that receives synaptic input from neurons. The physiological significance of this neuro-glial transmission remains elusive. Here, we hypothesize that fast excitatory synaptic signaling in NG2 cells, mediated by glutamate receptors of the AMPA subtype (AMPARs), serves as a critical determinant of the proliferation of NG2 cells and their putatively heterogeneous lineage progression into oligodendrocytes or other cell types. Employing an unbiased proteomic approach, we propose to analyze and functionally characterize the molecular design of AMPAR signaling in native NG2 cells with respect to their developmental stage and their localization in brain. In the next step, identified NG2 cell-specific AMPAR complex compositions, which define the trafficking and gating properties of the receptors, will be disturbed in situ to delineate their functional role in neuro-glial communication. Results are expected to be key to understand the relevance of glutamatergic signaling in NG2 cell biology.