Autophagy collaborates with apoptosis pathways to control oligodendrocyte number.

Autophagy collaborates with apoptosis pathways to control oligodendrocyte number.
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DOI:
10.1016/j.celrep.2023.112943
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发表时间:
2023-08-29
期刊:
影响因子:
8.8
通讯作者:
--
中科院分区:
生物学1区
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--
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少突胶质细胞是中枢神经系统中唯一产生髓鞘的细胞。少突胶质细胞的数量在不同的大脑区域受到严格控制,以匹配局部轴突的类型和数量,但其潜在机制仍不清楚。在这里,我们表明,自噬,一个进化上保守的细胞过程,促进细胞在生理条件下的生存,eleventually髓鞘前少突胶质细胞在发育过程中的凋亡。自噬通量在髓鞘形成前的少突胶质细胞中增加,其遗传阻断导致整个脑中的异位少突胶质细胞存活。自噬在髓鞘形成前的少突胶质细胞中自主地发挥细胞功能以触发细胞凋亡,并且它与TFEB通路在遗传上相互作用以限制不同脑区域的少突胶质细胞数量。我们的研究结果提供了体内证据,表明自噬促进哺乳动物细胞在生理条件下的凋亡,并揭示了关键的内在机制,少突分化。自噬与细胞凋亡共同维持细胞内环境的稳定。Zhang等人发现,自噬通过促进髓鞘形成前少突胶质细胞亚群中的细胞凋亡来限制成熟少突胶质细胞的数量,从而使早期脑发育期间CNS髓鞘形成的时空特异性成为可能。
Oligodendrocytes are the sole myelin-producing cells in the central nervous system. Oligodendrocyte number is tightly controlled across diverse brain regions to match local axon type and number, yet the underlying mechanisms remain unclear. Here, we show that autophagy, an evolutionarily conserved cellular process that promotes cell survival under physiological conditions, elicits premyelinating oligodendrocyte apoptosis during development. Autophagy flux is increased in premyelinating oligodendrocytes, and its genetic blockage causes ectopic oligodendrocyte survival throughout the entire brain. Autophagy functions cell autonomously in the premyelinating oligodendrocyte to trigger cell apoptosis, and it genetically interacts with the TFEB pathway to limit oligodendrocyte number across diverse brain regions. Our results provide in vivo evidence showing that autophagy promotes apoptosis in mammalian cells under physiological conditions and reveal key intrinsic mechanisms governing oligodendrogenesis. Autophagy cooperates with apoptosis to maintain cellular homeostasis. Zhang et al. discover that autophagy limits mature oligodendrocyte number by promoting apoptosis in subsets of premyelinating oligodendrocytes, thereby enabling the spatiotemporal specificity of CNS myelination during early brain development.
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