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- W2108492823 abstract "Activin A and transforming growth factor-β1 (TGF-β1) belong to the same family of growth and differentiation factors that modulate vascular lesion formation in distinct ways, which we wish to understand mechanistically. We investigated the expression of cell-surface receptors and activation of Smads in human vascular smooth muscle cells (SMCs) and demonstrated that activin receptor-like kinase-1 (ALK-1), ALK-4, ALK-5 and endoglin are expressed in human SMCs. As expected, TGF-β1 activates Smad1 and Smad2 in these cells. Interestingly, activin A also induces phosphorylation of both Smads, which has not been reported for Smad1 before. Transcriptome analyses of activin A and TGF-β1 treated SMCs with subsequent Gene-Set Enrichment Analyses revealed that many downstream gene networks are induced by both factors. However, the effect of activin A on expression kinetics of individual genes is less pronounced than for TGF-β1, which is explained by a more rapid dephosphorylation of Smads and p38-MAPK in response to activin A. Substantial differences in expression of fibronectin, alpha-V integrin and total extracellular collagen synthesis were observed. Genome-wide mRNA expression analyses clarify the distinct modulation of vascular lesion formation by activin A and TGF-β1, most significantly because activin A is non-fibrotic." @default.
- W2108492823 created "2016-06-24" @default.
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- W2108492823 date "2011-01-01" @default.
- W2108492823 modified "2023-10-14" @default.
- W2108492823 title "Activin A induces a non-fibrotic phenotype in smooth muscle cells in contrast to TGF-β" @default.
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- W2108492823 doi "https://doi.org/10.1016/j.yexcr.2010.10.007" @default.
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