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Role for the abi/wave protein complex in T cell receptor-mediated proliferation and cytoskeletal remodeling

机译:abi / wave蛋白复合体在T细胞受体介导的增殖和细胞骨架重塑中的作用

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Background: The molecular reorganization of signaling molecules after T cell receptor (TCR) activation is accompanied by polymerization of actin at the site of contact between a T cell and an antigen-presenting cell (APC), as well as extension of actin-rich lamellipodia around the APC. Actin polymerization is critical for the fidelity and efficiency of the T cell response to antigen. The ability of T cells to polymerize actin is critical for several steps in T cell activation including TCR clustering, mature immunological synapse formation, calcium flux, IL-2 production, and proliferation. Activation of the Rac GTPase has been linked to regulation of actin polymerization after TCR stimulation. However, the molecules required for TCR-mediated actin polymerization downstream of activated Rac have remained elusive. Here we identify a novel role for the Abi/Wave protein complex, which signals downstream of activated Rac, in the regulation of actin polymerization and T cell activation in response to TCR stimulation.
机译:背景:T细胞受体(TCR)激活后信号分子的分子重组伴随着肌动蛋白在T细胞与抗原呈递细胞(APC)接触部位的聚合,以及富含肌动蛋白的片状脂蛋白的延伸在APC周围。肌动蛋白聚合对于T细胞对抗原反应的保真度和效率至关重要。 T细胞聚合肌动蛋白的能力对于T细胞活化中的多个步骤至关重要,包括TCR聚类,成熟的免疫突触形成,钙通量,IL-2产生和增殖。 Rac GTPase的激活与TCR刺激后肌动蛋白聚合的调节有关。但是,TCR介导的活化Rac下游的肌动蛋白聚合所需的分子仍然难以捉摸。在这里,我们确定了Abi / Wave蛋白复合物的新作用,该复合物在激活的Rac下游发出信号,调节肌动蛋白聚合和响应TCR刺激的T细胞活化。

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