ATF6 safeguards organelle homeostasis and cellular aging in human mesenchymal stem cells.

ATF6 safeguards organelle homeostasis and cellular aging in human mesenchymal stem cells.
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ATF6 保障人类间充质干细胞的细胞器稳态和细胞衰老

DOI:
10.1038/s41421-017-0003-0
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发表时间:
2018
期刊:
影响因子:
33.5
通讯作者:
Liu GH
Liu GH
中科院分区:
生物学1区
文献类型:
--
作者:
Wang S;Hu B;Ding Z;Dang Y;Wu J;Li D;Liu X;Xiao B;Zhang W;Ren R;Lei J;Hu H;Chen C;Chan P;Li D;Qu J;Tang F;Liu GH

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细胞器稳态的丧失是衰老的标志。然而,这在基因表达水平上是如何发生的仍然难以捉摸。在这里,我们报告说,人类间充质干细胞(hMSC)老化与双膜细胞器功能障碍和转录因子ATF 6下调。CRISPR/Cas9介导的hMSC中的ATF 6失活,而不是人胚胎干细胞和人脂肪细胞中的ATF 6失活,导致细胞过早衰老,这是内膜稳态丧失的特征。转录组学分析揭示了细胞类型特异性的组成型和应激诱导的ATF 6调节基因参与细胞器的不同层次的稳态调节,FOS被表征为组成型ATF 6应答基因,其下调有助于hMSC老化。我们的研究揭示了第一个与膜细胞器稳态调节相关的ATF 6调节基因表达网络,并为人类干细胞衰老相关的磨损提供了新的机制见解。
Loss of organelle homeostasis is a hallmark of aging. However, it remains elusive how this occurs at gene expression level. Here, we report that human mesenchymal stem cell (hMSC) aging is associated with dysfunction of double-membrane organelles and downregulation of transcription factor ATF6. CRISPR/Cas9-mediated inactivation ofATF6in hMSCs, not in human embryonic stem cells and human adipocytes, results in premature cellular aging, characteristic of loss of endomembrane homeostasis. Transcriptomic analyses uncover cell type-specific constitutive and stress-induced ATF6-regulated genes implicated in various layers of organelles’ homeostasis regulation.FOSwas characterized as a constitutive ATF6 responsive gene, downregulation of which contributes to hMSC aging. Our study unravels the first ATF6-regulated gene expression network related to homeostatic regulation of membrane organelles, and provides novel mechanistic insights into aging-associated attrition of human stem cells.
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