A critical role for the autophagy gene Atg5 in T cell survival and proliferation.

A critical role for the autophagy gene Atg5 in T cell survival and proliferation.
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DOI:
10.1084/jem.20061303
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发表时间:
2007-01-22
期刊:
The Journal of experimental medicine
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:
Pua HH;Dzhagalov I;Chuck M;Mizushima N;He YW

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巨自噬(以下简称自噬)是一种保守的细胞内降解过程。最近对缺乏自噬基因ATG5和ATG7的细胞的研究表明,自噬在饥饿期间的细胞存活、微生物病原体的先天细胞清除和神经细胞维护中发挥着重要作用。然而,自噬在T淋巴细胞发育和存活中的作用尚不清楚。在这里,我们证明了自噬小体在原代小鼠T淋巴细胞中形成。通过建立ATG5−/−嵌合小鼠,我们发现ATG5缺陷的T淋巴细胞已经完全成熟。而ATG5嵌合体小鼠胸腺细胞总数和外周T、B淋巴细胞数量明显减少。在外周,ATG5、−/−、CD8+T淋巴细胞显著增加细胞死亡。此外,−/−刺激后,ATG5CD4+和CD8+T细胞不能进行有效的增殖。这些结果表明ATG5在淋巴细胞发育和功能的多个方面发挥着关键作用,并表明自噬可能对T淋巴细胞的生存和增殖都是必不可少的。
Macroautophagy (hereafter referred to as autophagy) is a well-conserved intracellular degradation process. Recent studies examining cells lacking the autophagy genes Atg5 and Atg7 have demonstrated that autophagy plays essential roles in cell survival during starvation, in innate cell clearance of microbial pathogens, and in neural cell maintenance. However, the role of autophagy in T lymphocyte development and survival is not known. Here, we demonstrate that autophagosomes form in primary mouse T lymphocytes. By generating Atg5−/− chimeric mice, we found that Atg5-deficient T lymphocytes underwent full maturation. However, the numbers of total thymocytes and peripheral T and B lymphocytes were reduced in Atg5 chimeras. In the periphery, Atg5−/− CD8+ T lymphocytes displayed dramatically increased cell death. Furthermore, Atg5−/− CD4+ and CD8+ T cells failed to undergo efficient proliferation after TCR stimulation. These results demonstrate a critical role for Atg5 in multiple aspects of lymphocyte development and function and suggest that autophagy may be essential for both T lymphocyte survival and proliferation.
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影响因子: --
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