Direct activation of TACE-mediated ectodomain shedding by p38 MAP kinase regulates EGF receptor-dependent cell proliferation.

Direct activation of TACE-mediated ectodomain shedding by p38 MAP kinase regulates EGF receptor-dependent cell proliferation.
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DOI:
10.1016/j.molcel.2010.01.034
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发表时间:
2010-02-26
期刊:
影响因子:
16
通讯作者:
Derynck R
Derynck R
中科院分区:
生物学1区
文献类型:
--
作者:
Xu P;Derynck R

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炎症刺激激活 TNF-α、L-选择素和其他跨膜蛋白的胞外域脱落。我们发现,响应炎症或应激信号而激活的 p38 MAP 激酶可直接激活 TACE,TACE 是一种膜相关金属蛋白酶,可响应生长因子和 Erk MAP 激酶激活而影响脱落。 p38α MAP 激酶与 TACE 的胞质结构域相互作用,并在 Thr735 上磷酸化它,这是 TACE 介导的胞外域脱落所必需的。 p38 MAP 激酶激活 TACE 会导致 TGF-α 家族配体的释放,从而激活 EGF 受体信号传导,从而增强细胞增殖。相反,p38α MAP 激酶活性的缺失会抑制 EGF 受体信号传导和下游 Erk MAP 激酶信号传导,以及自分泌 EGF 受体依赖性增殖。通过 TACE 介导的胞外域脱落来激活自分泌 EGF 受体与炎症和癌症进展密切相关,并且可能在与 p38 MAP 激酶激活相关的应激和病症中发挥作用。
Inflammatory stimuli activate ectodomain shedding of TNF-α, L-selectin and other transmembrane proteins. We show that p38 MAP kinase, which is activated in response to inflammatory or stress signals, directly activates TACE, a membrane-associated metalloprotease that effects shedding in response to growth factors and Erk MAP kinase activation. p38α MAP kinase interacts with the cytoplasmic domain of TACE, and phosphorylates it on Thr735, which is required for TACE-mediated ectodomain shedding. Activation of TACE by p38 MAP kinase results in the release of TGF-α family ligands, which activate EGF receptor signaling leading to enhanced cell proliferation. Conversely, depletion of p38α MAP kinase activity suppresses EGF receptor signaling and downstream Erk MAP kinase signaling, as well as autocrine EGF receptor-dependent proliferation. Autocrine EGF receptor activation through TACE-mediated ectodomain shedding intimately links inflammation and cancer progression, and may play a role in stress and conditions that relate to p38 MAP kinase activation.
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