TNF initiates E-selectin transcription in human endothelial cells through parallel TRAF-NF-kappa B and TRAF-RAC/CDC42-JNK-c-Jun/ATF2 pathways.

TNF initiates E-selectin transcription in human endothelial cells through parallel TRAF-NF-kappa B and TRAF-RAC/CDC42-JNK-c-Jun/ATF2 pathways.
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DOI:
10.4049/jimmunol.159.7.3508
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发表时间:
1997-10
影响因子:
4.4
通讯作者:
W. Min;J. Pober
W. Min;J. Pober
中科院分区:
医学2区
文献类型:
--
作者:
W. Min;J. Pober

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TNF 作用于 E-选择素基因启动子的三个 kappa B 元件和结合 ATF2/c-Jun 的变体 cAMP 响应元件。在人内皮细胞中,TNF 快速诱导 c-Jun 和 ATF2 的 N 末端结构域磷酸化。 N 端截短的 c-Jun 或催化失活的 Jun N 端激酶 (JNK) 1 和 2 的瞬时过表达会抑制 TNF 诱导的 E-选择素转录,但不会抑制 kappa B 启动子-报告基因的转录。 TRAF2 接头蛋白的瞬时过表达可以激活 NF-kappaB 和内源性 JNK,而 N 端截短的 TRAF2 蛋白则阻断 TNF 诱导的 NF-kappa B 和 JNK 激活以及 E-选择素启动子-报告基因转录。 RAC1 或 CDC42(而非 RAS)的瞬时过表达会持续激活 JNK 并增强 TNF 诱导的 E-选择素转录。最后,催化失活的 JNK 或截短的 TRAF2 的瞬时过表达会部分抑制人内皮细胞中内源性 E-选择素蛋白的表达。这些数据表明,TNF 激活平行的 TRAF-NF-kappa B 和 TRAF-RAC/CDC42-JNK-c-Jun/ATF2 途径来启动 E-选择素转录。
TNF acts on the E-selectin gene promoter at three kappa B elements and at a variant cAMP-responsive element that binds ATF2/c-Jun. In human endothelial cells, TNF rapidly induces N-terminal domain phosphorylation of both c-Jun and ATF2. Transient overexpression of N-terminal truncated c-Jun or catalytically inactive Jun N-terminal kinase (JNK) 1 and 2 inhibits TNF-induced transcription of an E-selectin but not a kappa B promoter-reporter gene. Transient overexpression of the TRAF2 adaptor protein can activate NF-kappaB and endogenous JNK, whereas N-terminal truncated TRAF2 protein blocks TNF-induced NF-kappa B and JNK activation as well as E-selectin promoter-reporter gene transcription. Transient overexpression of RAC1 or CDC42, but not RAS, constitutively activates JNK and augments TNF-induced E-selectin transcription. Finally, transient overexpression of catalytically inactive JNK or truncated TRAF2 partially inhibits endogenous E-selectin protein expression in human endothelial cells. These data suggest that TNF activates parallel TRAF-NF-kappa B and TRAF-RAC/CDC42-JNK-c-Jun/ATF2 pathways to initiate E-selectin transcription.