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T cell development involves TRAF3IP3-mediated ERK signaling in the Golgi.


ABSTRACT: Generation of T lymphocytes in the thymus is guided by signal transduction from the T cell receptor (TCR), but the underlying mechanism is incompletely understood. Here we have identified a Golgi-associated factor, TRAF3-interacting protein 3 (TRAF3IP3), as a crucial mediator of thymocyte development. TRAF3IP3 deficiency in mice attenuates the generation of mature thymocytes caused by impaired thymocyte-positive selection. TRAF3IP3 mediates TCR-stimulated activation of the mitogen-activated protein kinase (MAPK) extracellular signal-regulated kinase (ERK) and its upstream kinase mitogen/extracellular signal-regulated kinase (MEK). Interestingly, TRAF3IP3 exerts this signaling function through recruiting MEK to the Golgi and, thereby, facilitating the interaction of MEK with its activator BRAF. Transgenic expression of a constitutively active MEK rescues the T cell development block in Traf3ip3 knockout mice. These findings establish TRAF3IP3 as a novel regulator of T cell development and suggest a Golgi-specific ERK signaling mechanism that regulates thymocyte development.

SUBMITTER: Zou Q 

PROVIDER: S-EPMC4516800 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature

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T cell development involves TRAF3IP3-mediated ERK signaling in the Golgi.

Zou Qiang Q   Jin Jin J   Xiao Yichuan Y   Hu Hongbo H   Zhou Xiaofei X   Jie Zuliang Z   Xie Xiaoping X   Li James Y H JY   Cheng Xuhong X   Sun Shao-Cong SC  

The Journal of experimental medicine 20150720 8


Generation of T lymphocytes in the thymus is guided by signal transduction from the T cell receptor (TCR), but the underlying mechanism is incompletely understood. Here we have identified a Golgi-associated factor, TRAF3-interacting protein 3 (TRAF3IP3), as a crucial mediator of thymocyte development. TRAF3IP3 deficiency in mice attenuates the generation of mature thymocytes caused by impaired thymocyte-positive selection. TRAF3IP3 mediates TCR-stimulated activation of the mitogen-activated prot  ...[more]

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