SIRT1 activation by resveratrol attenuated isoproterenol-induced cardiac fibrosis by regulating endothelial-to-mesenchymal transition via the TGF-β/Smad2/3 pathway.
Does SIRT1 activation attenuate cardiac fibrosis by inhibiting endothelial-to-mesenchymal transition in preclinical models?
SIRT1 activation by resveratrol attenuates cardiac fibrosis by inhibiting endothelial-to-mesenchymal transition via the TGF-β/Smad2/3 pathway.
Endothelial-to-mesenchymal transition (EndMT) is closely related to the pathogenesis of various diseases, including cardiac fibrosis. Transforming growth factor (TGF)-β1 strongly induces EndMT, and sirtuin 1 (SIRT1) may play vital roles in TGF-β/Smad pathway inhibition. This study aimed to determine whether SIRT1 activation inhibits EndMT, thereby attenuating cardiac fibrosis. Cardiac fibrosis was induced in C57BL/6 mice by subcutaneously injecting isoproterenol. SIRT1 was activated and then suppressed by intraperitoneally injecting resveratrol (RSV) and EX527, respectively. EndMT was induced by adding TGF-β1 to H5V cells and measured by immunofluorescence and western blot. The role of SIRT1 in EndMT was determined by lentivirus-mediated overexpression of SIRT1. Interactions between SIRT1 and Smad2/3 in the TGF-β/Smad2/3 pathway were examined by immunoprecipitation. SIRT1 activation upregulated CD31 and vascular endothelial-cadherin, and downregulated α-smooth muscle actin, fibroblast-specific protein 1, and vimentin. SIRT1 upregulated and EX527 inhibited TGF-β receptor 1 (TGF-βR1) and P-Smad2/3 expression, respectively. SIRT1 activation and overexpression by RSV/SRT2104 and lentivirus transfection, respectively, reduced TGF-β1-induced EndMT. SIRT1 and Smad2/3 interaction was shown by immunoprecipitation in vivo and in vitro. TGF-βR1 and P-Smad2/3 expression was downregulated and Smad2/3 nuclear translocation was inhibited. In conclusion, SIRT1 activated by RSV attenuated isoproterenol-induced cardiac fibrosis by regulating EndMT via the TGF-β/Smad2/3 pathway.
Liu et al. (Wed,) conducted a other in Cardiac fibrosis. SIRT1 activation (resveratrol/SRT2104 or lentivirus) vs. Control or SIRT1 suppression (EX527) was evaluated on Endothelial-to-mesenchymal transition (EndMT) and cardiac fibrosis. SIRT1 activation by resveratrol attenuated isoproterenol-induced cardiac fibrosis by regulating endothelial-to-mesenchymal transition via the TGF-β/Smad2/3 pathway.
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