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The methyltransferase SET9 regulates TGFB1 activation of renal fibroblasts via interaction with SMAD3.
Journal of Cell Science 2018 January 9
Chronic kidney disease (CKD) is a global socioeconomic problem. It is characterised by the presence of differentiated myofibroblasts, which cause tissue fibrosis in response to TGFB1, leading to renal failure. Here, we define a novel interaction between the SET9 lysine methyltransferase (also known as SETD7) and SMAD3, the principal mediator of TGFB1 signalling in myofibroblasts. We show that SET9-deficient fibroblasts exhibit globally altered gene expression profiles in response to TGFB1, whilst overexpression of SET9 enhances SMAD3 transcriptional activity. We also show that SET9 facilitates nuclear import of SMAD3 and controls SMAD3 protein degradation via ubiquitylation. On a cellular level, we demonstrate that SET9 is broadly required for the effects of TGFB1 in diseased primary renal fibroblasts; SET9 promotes fibroblast migration into wounds, expression of extracellular matrix proteins, collagen contractility and myofibroblast differentiation. Finally, we demonstrate that SET9 is recruited to the α-smooth muscle actin gene in response to TGFB1, providing a mechanism by which SET9 regulates myofibroblast contractility and differentiation. Together with previous studies, we make the case for SET9 inhibition in the treatment of progressive CKD.
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