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首页> 外文期刊>The British journal of psychiatry : >Distinct integrin activation pathways for effector and regulatory T cell trafficking and function
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Distinct integrin activation pathways for effector and regulatory T cell trafficking and function

机译:效应和监管T细胞贩运和功能的不同整联素激活途径

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摘要

Integrin activation mediates lymphocyte trafficking and immune functions. Conventional T cell (Tconv cell) integrin activation requires Rap1-interacting adaptor molecule (RIAM). Here, we report that Apbb1ip(-/-) (RIAM-null) mice are protected from spontaneous colitis due to IL-10 deficiency, a model of inflammatory bowel disease (IBD). Protection is ascribable to reduced accumulation and homing of Tconv cells in gut-associated lymphoid tissue (GALT). Surprisingly, there are abundant RIAM-null regulatory T cells (T reg cells) in the GALT. RIAM-null T reg cells exhibit normal homing to GALT and lymph nodes due to preserved activation of integrins alpha L beta 2, alpha 4 beta 1, and alpha 4 beta 7. Similar to Tconv cells, T reg cell integrin activation and immune function require Rap1; however, lamellipodin (Raph1), a RIAM paralogue, compensates for RIAM deficiency. Thus, in contrast to Tconv cells, RIAM is dispensable for T reg cell integrin activation and suppressive function. In consequence, inhibition of RIAM can inhibit spontaneous Tconv cell-mediated autoimmune colitis while preserving T reg cell trafficking and function.
机译:整合素激活介导淋巴细胞运输和免疫功能。传统的T细胞(Tconv细胞)整合素激活需要Rap1相互作用适配器分子(RIAM)。在此,我们报告,由于炎症性肠病(IBD)模型IL-10缺乏,Apbb1ip(-/-)(RIAM-null)小鼠可免于自发性结肠炎。保护作用可归因于肠道相关淋巴组织(GALT)中Tconv细胞的聚集和归巢减少。令人惊讶的是,GALT中有大量RIAM无效调节性T细胞(T调节细胞)。由于整合素α1β2、α4β1和α4β7的激活得以保留,RIAM空T reg细胞表现出正常的GALT和淋巴结归巢。与Tconv细胞类似,T调节细胞整合素激活和免疫功能需要Rap1;然而,一种RIAM的助手拉美利波丁(Raph1)可以弥补RIAM的不足。因此,与Tconv细胞相比,RIAM对T调节细胞整合素的激活和抑制功能是必不可少的。因此,抑制RIAM可以抑制自发性Tconv细胞介导的自身免疫性结肠炎,同时保留T调节细胞的运输和功能。

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