The class III kinase Vps34 promotes T lymphocyte survival through regulating IL-7Rα surface expression.

The class III kinase Vps34 promotes T lymphocyte survival through regulating IL-7Rα surface expression.
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DOI:
10.4049/jimmunol.1100710
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发表时间:
2011-11-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
He YW
He YW
中科院分区:
其他
文献类型:
--
作者:
McLeod IX;Zhou X;Li QJ;Wang F;He YW

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IL-7Rα介导的信号是初始T淋巴细胞生存所必需的。最近的研究表明,IL-7Rα被内化,要么被回收到细胞表面,要么被降解。然而,IL-7Rα转运的细胞内过程是如何被调控的还不清楚。在这里,我们表明,VPS34,第三类磷脂酰肌醇3-激酶,在适当的IL-7Rα细胞内转运中发挥关键作用。T淋巴细胞中缺乏Vps34的小鼠的T淋巴细胞室严重减少。VPS34缺陷的T淋巴细胞死亡增加,IL-7Rα表面表达减少,尽管三种主要形式的自噬保持完好。正常T淋巴细胞处于稳定状态的细胞内IL-7Rα可通过早期的内小体/多囊泡小体转运到晚期的内小体-高尔基体表面表达,或通过溶酶体降解。然而,Vps34缺陷的T细胞错配了细胞内的EA1、HRS和Vps36蛋白水平,其综合结果是无法将内化的IL-7Rα动员到逆转录途径中用于表面展示。我们的研究表明,VPS34虽然是自噬诱导的必需品,但它是幼稚T细胞稳态的关键调节因子,调节IL-7Rα的运输、信号和循环。
IL-7Rα mediated signals are essential for naive T lymphocyte survival. Recent studies show that IL-7Rα is internalized and either recycled to cell surface or degraded. However, how the intracellular process of IL-7Rα trafficking is regulated is unclear. Here we show that Vps34, the class III phosphatidylinositol 3-kinase, plays a critical role in proper IL-7Rα intracellular trafficking. Mice lacking Vps34 in T lymphocytes had a severely reduced T lymphocyte compartment. Vps34-deficient T lymphocytes exhibit increased death and reduced IL-7Rα surface expression, though three major forms of autophagy remain intact. Intracellular IL-7Rα in normal T lymphocytes at steady-state is trafficked through either early endosome/multivesicular bodies (MVB) to the late endosome-Golgi for surface expression or to the lysosome for degradation. However, Vps34-deficient T cells have mislocalized intracellular Eea1, HRS, and Vps36 protein levels, the combined consequence of which is the inability to mobilize internalized IL-7Rα into the retromer pathway for surface display. Our studies reveal that Vps34, though dispensible for autophagy induction, is a critical regulator of naïve T cell homeostasis, modulating IL-7Rα trafficking, signaling, and recycling.
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