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Journal of Cell Science 2016-Aug

Arg tyrosine kinase modulates TGF-β1 production in human renal tubular cells under high-glucose conditions.

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Линкът е запазен в клипборда
Barbara Torsello
Cristina Bianchi
Chiara Meregalli
Vitalba Di Stefano
Lara Invernizzi
Sofia De Marco
Giorgio Bovo
Rinaldo Brivio
Guido Strada
Silvia Bombelli

Ключови думи

Резюме

Renal tubular cells are involved in the tubular interstitial fibrosis observed in diabetic nephropathy. It is debated whether epithelial-mesenchymal transition (EMT) affects tubular cells, which under high-glucose conditions overproduce transforming growth factor-β (TGF-β), a fibrogenic cytokine involved in interstitial fibrosis development. Our study investigated the involvement of non-receptor tyrosine kinase Arg (also called Abl2) in TGF-β production. Human primary tubular cell cultures exposed to high-glucose conditions were used. These cells showed an elongated morphology, stress fibers and vimentin increment but maintained most of the epithelial marker expression and distribution. In these cells exposed to high glucose, which overexpressed and secreted active TGF-β1, Arg protein and activity was downregulated. A further TGF-β1 increase was induced by Arg silencing with siRNA, as with the Arg tyrosine kinase inhibitor Imatinib. In the cells exposed to high glucose, reactive oxygen species (ROS)-dependent Arg kinase downregulation induced both RhoA activation, through p190RhoGAPA (also known as ARHGAP35) modulation, and proteasome activity inhibition. These data evidence a new specific involvement of Arg kinase into the regulation of TGF-β1 expression in tubular cells under high-glucose conditions and provide cues for new translational approaches in diabetic nephropathy.

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