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Deprecated: Implicit conversion from float 276.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 PLoS+One 2016 ; 11 (9): ä Nephropedia Template TP
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Stimulation of Transforming Growth Factor-?1-Induced Endothelial-To-Mesenchymal Transition and Tissue Fibrosis by Endothelin-1 (ET-1): A Novel Profibrotic Effect of ET-1 #MMPMID27583804
Wermuth PJ; Li Z; Mendoza FA; Jimenez SA
PLoS One 2016[]; 11 (9): ä PMID27583804show ga
TGF-?-induced endothelial-to-mesenchymal transition (EndoMT) is a newly recognized source of profibrotic activated myofibroblasts and has been suggested to play a role in the pathogenesis of various fibrotic processes. Endothelin-1 (ET-1) has been implicated in the development of tissue fibrosis but its participation in TGF-?-induced EndoMT has not been studied. Here we evaluated the role of ET-1 on TGF-?1-induced EndoMT in immunopurified CD31+/CD102+ murine lung microvascular endothelial cells. The expression levels of ?-smooth muscle actin (?-SMA), of relevant profibrotic genes, and of various transcription factors involved in the EndoMT process were assessed employing quantitative RT-PCR, immunofluorescence histology and Western blot analysis. TGF-?1 caused potent induction of EndoMT whereas ET-1 alone had a minimal effect. However, ET-1 potentiated TGF-?1-induced EndoMT and TGF-?1-stimulated expression of mesenchymal cell specific and profibrotic genes and proteins. ET-1 also induced expression of the TGF-? receptor 1 and 2 genes, suggesting a plausible autocrine mechanism to potentiate TGF-?-mediated EndoMT and fibrosis. Stimulation of TGF-?1-induced skin and lung fibrosis by ET-1 was confirmed in vivo in an animal model of TGF-?1-induced tissue fibrosis. These results suggest a novel role for ET-1 in the establishment and progression of tissue fibrosis.