Genetic evidence that Nkx2.2 and Pdgfra are major determinants of the timing of oligodendrocyte differentiation in the developing CNS

Genetic evidence that Nkx2.2 and Pdgfra are major determinants of the timing of oligodendrocyte differentiation in the developing CNS
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遗传证据表明 Nkx2.2 和 Pdgfra 是发育中中枢神经系统少突胶质细胞分化时间的主要决定因素

DOI:
10.1242/dev.095323
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发表时间:
2014-02
期刊:
影响因子:
4.6
通讯作者:
Yiping Chen
Yiping Chen
中科院分区:
生物学2区
文献类型:
--
作者:
Mengsheng Qiu;Xiaofeng Zhao;Kang Zheng;Hong Li;Hao Huang;Zunyi Zhang;Teresa Mastracci;Michael Wegner;Yiping Chen

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在中枢神经系统(CNS)中,少突胶质细胞成熟和轴突髓鞘形成按可预测的时间表发生,但潜在的时间机制很大程度上未知。在本研究中,我们证明 Nkx2.2 同源域转录因子是发育过程中少突胶质细胞分化时间的关键调节因子。虽然早期少突胶质细胞前体细胞 (OPC) 中 Nkx2.2 的诱导表达会导致少突胶质细胞早熟分化,但 Nkx2.2 的条件性消除会暂时延迟少突胶质细胞的成熟。此外,Nkx2.2可以直接结合血小板源性生长因子受体α(Pdgfra)的启动子并抑制其基因表达。 Pdgfra 的基因消融模拟了 Nkx2.2 过度表达对加速发育中脊髓 OPC 分化的影响。总之,我们的研究结果强烈表明,Nkx2.2 作为一个主要的“开关”,可以关闭 OPC 中的 Pdgfra 信号传导并启动少突胶质细胞分化的内在程序。
In the central nervous system (CNS), oligodendrocyte maturation and axonal myelination occur on a predictable schedule, but the underlying timing mechanisms are largely unknown. In the present study, we demonstrate that Nkx2.2 homeodomain transcription factor is a key regulator for the timing of oligodendrocyte differentiation during development. Whereas induced expression of Nkx2.2 in early oligodendrocyte precursor cells (OPCs) causes precocious differentiation of oligodendrocytes, conditional ablation of Nkx2.2 temporally delays oligodendrocyte maturation. Moreover, Nkx2.2 can directly bind to the promoter of platelet-derived growth factor receptor alpha (Pdgfra) and repress its gene expression. Genetic ablation of Pdgfra mimics the effect of Nkx2.2 overexpression in accelerating OPC differentiation in the developing spinal cord. Together, our findings strongly suggest that Nkx2.2 functions as a major ‘switch’ to turn off Pdgfra signaling in OPCs and initiate the intrinsic program for oligodendrocyte differentiation.
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