Absence of integrin-mediated TGFbeta1 activation in vivo recapitulates the phenotype of TGFbeta1-null mice.

Absence of integrin-mediated TGFbeta1 activation in vivo recapitulates the phenotype of TGFbeta1-null mice.
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DOI:
10.1083/jcb.200611044
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发表时间:
2007-03-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Munger JS
Munger JS
中科院分区:
其他
文献类型:
--
作者:
Yang Z;Mu Z;Dabovic B;Jurukovski V;Yu D;Sung J;Xiong X;Munger JS

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多功能细胞因子转化生长因子(TGF)β1与其加工前肽(潜伏相关肽[LTP])以潜伏复合物形式分泌。TGFβ1必须从该复合物中功能性释放,然后才能与TGFβ受体结合。潜伏性TGFβ1激活的一种机制涉及整合素αvβ6和αvβ8与TGF β 1中的RGD序列的相互作用;其他假定的潜伏性TGFβ1激活剂包括血小板反应蛋白-1、氧化剂和各种蛋白酶。为了评估结合RGD的整合素对体内TGFβ1活化的贡献,我们在Tgfb 1中产生了编码RGD序列(RGE)的非功能变体的突变。具有这种突变的小鼠(Tgfb 1 RGE/RGE)表现出Tgfb 1 −/−小鼠的主要特征(血管发生缺陷、多器官炎症和缺乏朗格汉斯细胞),尽管产生正常水平的潜伏性TGFβ1。这些发现表明,在发育过程中和免疫系统中,结合RGD的整合素是必需的潜在TGFβ1激活剂。
The multifunctional cytokine transforming growth factor (TGF) β1 is secreted in a latent complex with its processed propeptide (latency-associated peptide [LAP]). TGFβ1 must be functionally released from this complex before it can engage TGFβ receptors. One mechanism of latent TGFβ1 activation involves interaction of the integrins αvβ6 and αvβ8 with an RGD sequence in LAP; other putative latent TGFβ1 activators include thrombospondin-1, oxidants, and various proteases. To assess the contribution of RGD-binding integrins to TGFβ1 activation in vivo, we created a mutation in Tgfb1 encoding a nonfunctional variant of the RGD sequence (RGE). Mice with this mutation (Tgfb1RGE/RGE) display the major features of Tgfb1−/− mice (vasculogenesis defects, multiorgan inflammation, and lack of Langerhans cells) despite production of normal levels of latent TGFβ1. These findings indicate that RGD-binding integrins are requisite latent TGFβ1 activators during development and in the immune system.
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