The kinase p38 activated by the metabolic regulator AMPK and scaffold TAB1 drives the senescence of human T cells.

The kinase p38 activated by the metabolic regulator AMPK and scaffold TAB1 drives the senescence of human T cells.
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DOI:
10.1038/ni.2981
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发表时间:
2014-10
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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在T淋巴细胞中,p38 MAPK(MAPK)调节多效性功能,并被规范的MAPK信号或替代T细胞受体(TCR)激活途径激活。在这里,我们表明,衰老的人类T细胞缺乏规范的和替代的p38激活途径,但自发地与代谢主调节因子AMPK结合,触发p38募集到支架TAB1,导致p38自动磷酸化。通过这一途径的信号通路抑制端粒酶活性、T细胞增殖和TCR信号体关键成分的表达。我们的发现确定了T细胞中一种未知的p38激活模式,这种模式是由细胞内变化驱动的,例如低营养和DNA损伤信号(“感觉内”途径)。通过阻断AMPK-TAB1依赖的p38激活,衰老T细胞的增殖缺陷被逆转。
In T lymphocytes, p38 MAP kinase (MAPK) regulates pleiotropic functions and is activated by canonical MAPK signaling or the alternative T cell receptor (TCR) activation pathway. Here we show that senescent human T cells lack the canonical and alternative pathways of p38 activation, but spontaneously engage the metabolic master regulator AMPK to trigger p38 recruitment to the scaffold TAB1 causing p38 auto-phosphorylation. Signaling via this pathway inhibits telomerase activity, T cell proliferation and expression of key components of the TCR signalosome. Our findings identify an unrecognized mode of p38 activation in T cells driven by intracellular changes such as low-nutrient and DNA-damage signaling (‘intra-sensory’ pathway). The proliferative defect of senescent T cells is reversed by blocking AMPK-TAB1-dependent p38 activation.
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