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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 eLife 2018 ; 7 (ä): ä Nephropedia Template TP
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TGF-? uses a novel mode of receptor activation to phosphorylate SMAD1/5 and induce epithelial-to-mesenchymal transition #MMPMID29376829
Ramachandran A; Vizán P; Das D; Chakravarty P; Vogt J; Rogers KW; Müller P; Hinck AP; Sapkota GP; Hill CS
eLife 2018[]; 7 (ä): ä PMID29376829show ga
The best characterized signaling pathway downstream of transforming growth factor ? (TGF-?) is through SMAD2 and SMAD3. However, TGF-? also induces phosphorylation of SMAD1 and SMAD5, but the mechanism of this phosphorylation and its functional relevance is not known. Here, we show that TGF-?-induced SMAD1/5 phosphorylation requires members of two classes of type I receptor, TGFBR1 and ACVR1, and establish a new paradigm for receptor activation where TGFBR1 phosphorylates and activates ACVR1, which phosphorylates SMAD1/5. We demonstrate the biological significance of this pathway by showing that approximately a quarter of the TGF-?-induced transcriptome depends on SMAD1/5 signaling, with major early transcriptional targets being the ID genes. Finally, we show that TGF-?-induced epithelial-to-mesenchymal transition requires signaling via both the SMAD3 and SMAD1/5 pathways, with SMAD1/5 signaling being essential to induce ID1. Therefore, combinatorial signaling via both SMAD pathways is essential for the full TGF-?-induced transcriptional program and physiological responses.