ArticleMolecular and cellular biology2011
TSC-22 promotes transforming growth factor β-mediated cardiac myofibroblast differentiation by antagonizing Smad7 activity.
Article in Molecular and cellular biology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers.
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35 citing papers in PubMed, 54 citations in OpenAlex.
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- Review
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Authors and funding
10 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Transforming growth factor β (TGF-β) plays a critical role in tissue fibrosis. The duration and intensity of TGF-β signaling are tightly regulated. Here we report that TSC-22 (TGF-β-stimulated clone 22) facilitates TGF-β signaling by antagonizing Smad7 activity to increase receptor stability. TSC-22 enhances TGF-β-induced Smad2/3 phosphorylation and transcriptional responsiveness. The stimulatory effect of TSC-22 is dependent on Smad7, as silencing Smad7 expression abolishes it. TSC-22 interacts with TGF-β type I receptor TβRI and Smad7 in mutually exclusive ways and disrupts the association of Smad7/Smurfs with TβRI, thereby preventing ubiquitination and degradation of the receptor. We also found that TSC-22 can promote the differentiation of cardiac myofibroblasts by increasing expression of the fibrotic genes for α-smooth muscle actin (α-SMA), PAI-1, fibronectin, and collagen I, which is consistent with upregulation of TSC-22, phospho-Smad2/3, and the fibrotic genes in isoproterenol-induced rat myocardial fibrotic hearts. Taken together with the notion that TGF-β induces TSC-22 expression, our findings suggest that TSC-22 regulates TGF-β signaling via a positive-feedback mechanism and may contribute to myocardial fibrosis.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.