Chaperone-mediated autophagy regulates T cell responses through targeted degradation of negative regulators of T cell activation.

Chaperone-mediated autophagy regulates T cell responses through targeted degradation of negative regulators of T cell activation.
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DOI:
10.1038/ni.3003
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发表时间:
2014-11
期刊:
影响因子:
30.5
通讯作者:
Macian, Fernando
Macian, Fernando
中科院分区:
医学1区
文献类型:
--
作者:
Valdor, Rut;Mocholi, Enric;Botbol, Yair;Guerrero-Ros, Ignacio;Chandra, Dinesh;Koga, Hiroshi;Gravekamp, Claudia;Cuervo, Ana Maria;Macian, Fernando

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分子伴侣介导的自噬(CMA)靶向可溶性蛋白以进行溶酶体降解。在这里,我们表明,CMA在T细胞中被激活,以响应T细胞受体(TCR)的参与,诱导溶酶体CMA受体,LAMP-2A的表达。在活化的T细胞中,CMA靶向泛素连接酶Itch和钙调磷酸酶抑制剂Rcan-1进行降解,以维持活化诱导的反应。因此,T细胞中Lamp 2a的缺失导致对免疫或李斯特菌感染的体内应答缺陷。随着年龄的增长,T细胞中的CMA活性也会受损,这会对它们的功能产生负面影响。老化T细胞中LAMP-2A的恢复导致激活诱导的应答增强。我们的研究结果定义了CMA通过靶向降解T细胞活化的负调节因子在调节T细胞活化中的作用。
Chaperone mediated autophagy (CMA) targets soluble proteins for lysosomal degradation. Here we show that CMA is activated in T cells in response to T cell receptor (TCR) engagement, which induces the expression of the lysosomal CMA receptor, LAMP-2A. In activated T cells, CMA targets the ubiquitin ligase Itch and the calcineurin inhibitor Rcan-1 for degradation to maintain activation-induced responses. Consequently, deletion of Lamp2a in T cells causes deficient in vivo responses to immunization or Listeria infection. Impaired CMA activity also occurs in T cells with age, which negatively impacts their function. Restoration of LAMP-2A in aged T cells results in enhancement of activation-induced responses. Our findings define a role for CMA in the regulation of T cell activation through the targeted degradation of negative regulators of T cell activation.
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