Klf5 controls bone marrow homing of stem cells and progenitors through Rab5-mediated β1/β2-integrin trafficking.

Klf5 controls bone marrow homing of stem cells and progenitors through Rab5-mediated β1/β2-integrin trafficking.
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DOI:
10.1038/ncomms2645
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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Kruppel样因子5(Klf 5)调节多能干细胞自我更新,但其在体干细胞中的作用尚不清楚。在这里,我们表明Klf 5缺陷型造血干细胞和祖细胞(HSC/P)在移植后不能植入。这种HSC/P缺陷与受损的骨髓归巢和倒伏以及在骨髓中的滞留减少、与纤连蛋白的粘附减少和膜结合的β1/β2-整合素的表达减少相关。HSC中Klf 5的体内可诱导的功能获得性增加HSC/P粘附。Rab 5家族成员(β1/β2-整合素在早期内体中再循环的介导物)的表达在Klf 5 Δ/Δ HSC/Ps中降低。Klf 5与Rab 5 a/B启动子直接结合,Rab 5 B的过表达可挽救活化的β1/β2整合素的表达、Klf 5 Δ/Δ HSC/Ps的粘附和骨髓归巢。总之,这些数据表明Klf 5通过Rab 5依赖性的β1/β2整合素的翻译后调节对于HSC/Ps在骨髓中的粘附、归巢、寄宿和保留是不可缺少的。
Kruppel-like factor 5 (Klf5) regulates pluripotent stem cell self-renewal but its role in somatic stem cells is unknown. Here we show that Klf5 deficient haematopoietic stem cells and progenitors (HSC/P) fail to engraft after transplantation. This HSC/P defect is associated with impaired bone marrow homing and lodging and decreased retention in bone marrow, and with decreased adhesion to fibronectin and expression of membrane-bound β1/β2-integrins. In vivo inducible gain-of-function of Klf5 in HSCs increases HSC/P adhesion. The expression of Rab5 family members, mediators of β1/β2-integrin recycling in the early endosome, is decreased in Klf5Δ/Δ HSC/Ps. Klf5 binds directly to the promoter of Rab5a/b and overexpression of Rab5b rescues the expression of activated β1/β2-integrins, adhesion and bone marrow homing of Klf5Δ/Δ HSC/Ps. Altogether, these data indicate that Klf5 is indispensable for adhesion, homing, lodging and retention of HSC/Ps in the bone marrow through Rab5-dependent post-translational regulation of β1/β2 integrins.
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