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:
影响因子:
--
通讯作者:
He YW
中科院分区:
文献类型:
--
作者:
McLeod IX;Zhou X;Li QJ;Wang F;He YW
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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影响因子:
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作者:
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通讯作者:
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DOI:
10.1084/jem.20061303
发表时间:
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期刊:
The Journal of experimental medicine
影响因子:
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作者:
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