Oligodendrocyte-encoded HIF function couples postnatal myelination and white matter angiogenesis.
Oligodendrocyte-encoded HIF function couples postnatal myelination and white matter angiogenesis.
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DOI:
10.1016/j.cell.2014.04.052
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发表时间:
2014-07-17
期刊:
影响因子:
64.5
通讯作者:
Rowitch DH
中科院分区:
文献类型:
--
作者:
Yuen TJ;Silbereis JC;Griveau A;Chang SM;Daneman R;Fancy SPJ;Zahed H;Maltepe E;Rowitch DH
Myelin sheaths provide critical functional and trophic support for axons in white matter tracts of the brain. Oligodendrocyte precursor cells (OPCs) have extraordinary metabolic requirements during development as they differentiate to produce multiple myelin segments, implying they must first secure adequate access to blood supply. However, mechanisms that coordinate myelination and angiogenesis are unclear. Here, we show that oxygen tension, mediated by OPC-encoded hypoxia-inducible factor (HIF) function, is an essential regulator of postnatal myelination. Constitutive HIF1/2α stabilization resulted in OPC maturation arrest through autocrine activation of canonical Wnt7a/7b. Surprisingly, such OPCs also show paracrine activity that induces excessive postnatal white matter angiogenesis in vivo, and directly stimulates endothelial cell proliferation in vitro. Conversely, OPC-specific HIF1/2α loss-of-function leads to insufficient angiogenesis in corpus callosum and catastrophic axon loss. These findings indicate that OPC-intrinsic HIF signaling couples postnatal white matter angiogenesis, axon integrity and the onset of myelination in mammalian forebrain.
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