Tenascin-X promotes epithelial-to-mesenchymal transition by activating latent TGF-β.

Tenascin-X promotes epithelial-to-mesenchymal transition by activating latent TGF-β.
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DOI:
10.1083/jcb.201308031
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发表时间:
2014-05-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Valcourt U
Valcourt U
中科院分区:
其他
文献类型:
--
作者:
Alcaraz LB;Exposito JY;Chuvin N;Pommier RM;Cluzel C;Martel S;Sentis S;Bartholin L;Lethias C;Valcourt U

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The matrix glycoprotein tenascin-X regulates the bioavailability of mature TGF-β through an α11β1 integrin–dependent mechanism that promotes epithelial-to-mesenchymal transition. Transforming growth factor β (TGF-β) isoforms are secreted as inactive complexes formed through noncovalent interactions between the bioactive TGF-β entity and its N-terminal latency-associated peptide prodomain. Extracellular activation of the latent TGF-β complex is a crucial step in the regulation of TGF-β function for tissue homeostasis. We show that the fibrinogen-like (FBG) domain of the matrix glycoprotein tenascin-X (TNX) interacts physically with the small latent TGF-β complex in vitro and in vivo, thus regulating the bioavailability of mature TGF-β to cells by activating the latent cytokine into an active molecule. Activation by the FBG domain most likely occurs through a conformational change in the latent complex and involves a novel cell adhesion–dependent mechanism. We identify α11β1 integrin as a cell surface receptor for TNX and show that this integrin is crucial to elicit FBG-mediated activation of latent TGF-β and subsequent epithelial-to-mesenchymal transition in mammary epithelial cells.
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