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SIS3, a specific inhibitor of smad3, attenuates bleomycin-induced pulmonary fibrosis in mice.
Biochemical and Biophysical Research Communications 2018 September 6
Pulmonary fibrosis (PF) is a fatal respiratory disease with no effective medical treatments available. TGF-β/Smads signaling has been implicated to play an essential in the pathogenesis of PF, in which Smad3 act as the integrator of pro-fibrosis signals. In this study, we determined the effect of SIS3, a specific inhibitor of Smad3, in an experimental mouse model of lung fibrosis. We observed that SIS3 treatment significantly reduced bleomycin (BLM)-induced pathological changes and collagen deposition in the lung as indicated by Masson staining, real-time PCR and hydroxyproline content assay. As expected, the levels of Smad3 phosphorylation were decreased in the lung of mice treated with SIS3. Furthermore, SIS3 treatment also suppressed BLM-induced infiltration of inflammatory cells in the lung. Taken together, our results suggest that SIS3 ameliorated BLM-induced PF in mouse lungs. Thus, targeting Smad3 with SIS3 may be an effective approach for treatment of fibrotic disorders.
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