TRAF6 Mediates Basal Activation of NF-κB Necessary for Hematopoietic Stem Cell Homeostasis.

TRAF6 Mediates Basal Activation of NF-κB Necessary for Hematopoietic Stem Cell Homeostasis.
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DOI:
10.1016/j.celrep.2018.01.013
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发表时间:
2018-01-30
期刊:
影响因子:
8.8
通讯作者:
Starczynowski DT
Starczynowski DT
中科院分区:
生物学1区
文献类型:
--
作者:
Fang J;Muto T;Kleppe M;Bolanos LC;Hueneman KM;Walker CS;Sampson L;Wellendorf AM;Chetal K;Choi K;Salomonis N;Choi Y;Zheng Y;Cancelas JA;Levine RL;Starczynowski DT

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在没有炎症的情况下,基础核因子 κB (NF-κB) 激活是造血干细胞 (HSC) 稳态所必需的;然而,基础 NF-κB 信号传导的上游介质尚不清楚。在这里,我们将 TRAF6 描述为通过 NF-κB 基础激活来调节 HSC 稳态的重要调节剂。 Traf6 的造血特异性缺失导致 HSC 自我更新和健康受损。 Traf6 缺陷的造血干/祖细胞 (HSPC) 的基因表达、RNA 剪接和分子分析揭示了适应性免疫信号、先天免疫信号和 NF-κB 信号的变化,表明在没有细胞因子刺激和/或感染的情况下通过 TRAF6 的信号传导是 HSC 功能所必需的。此外,我们还确定 IκB 激酶 β (IKKβ) 介导的 NF-κB 激活的丧失是 Traf6 缺陷型 HSPC 中观察到的主要造血缺陷的原因,因为 IKKβ 的缺失同样会导致 HSC 自我更新和适应性受损。总而言之,TRAF6 通过维持 IKKβ/NF-κB 信号传导的最低阈值水平来维持 HSC 稳态。方等人。确定 TRAF6 是造血干细胞 (HSC) 自我更新和静止的重要调节因子。 TRAF6 通过在没有炎症的情况下维持 NF-κB 信号传导的最低阈值水平来保持 HSC 稳态。
Basal nuclear factor κB (NF-κB) activation is required for hematopoietic stem cell (HSC) homeostasis in the absence of inflammation; however, the upstream mediators of basal NF-κB signaling are less well understood. Here, we describe TRAF6 as an essential regulator of HSC homeostasis through basal activation of NF-κB. Hematopoietic-specific deletion of Traf6 resulted in impaired HSC self-renewal and fitness. Gene expression, RNA splicing, and molecular analyses of Traf6-deficient hematopoietic stem/progenitor cells (HSPCs) revealed changes in adaptive immune signaling, innate immune signaling, and NF-κB signaling, indicating that signaling via TRAF6 in the absence of cytokine stimulation and/or infection is required for HSC function. In addition, we established that loss of IκB kinase beta (IKKβ)- mediated NF-κB activation is responsible for the major hematopoietic defects observed in Traf6-deficient HSPC as deletion of IKKβ similarly resulted in impaired HSC self-renewal and fitness. Taken together, TRAF6 is required for HSC homeostasis by maintaining a minimal threshold level of IKKβ/NF-κB signaling. Fang et al. identify TRAF6 as an essential regulator of hematopoietic stem cell (HSC) self-renewal and quiescence. TRAF6 preserves HSC homeostasis by maintaining a minimal threshold level of NF-κB signaling in the absence of inflammation.
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