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Idiopathic pulmonary fibrosis (IPF) induces significant morbidity and mortality, for which there are limited therapeutic options available. Here, we found that tetraethylthiuram disulphide (disulfiram, DSF), a derivative of thiuram, used in the treatment of alcohol abuse, has an inhibitory effect on bleomycin (BLM)-induced pulmonary fibrosis via the attenuation of the fibroblast-to-myofibroblast transition, migration, and proliferation of fibroblasts. Furthermore, DSF inhibited the activation of primary pulmonary fibroblasts and fibroblast cell line under transforming growth factor-β 1 (TGF-β1) challenge. Mechanistically, the anti-fibrotic effect of DSF on fibroblasts depends on the inhibition of TGF-β signalling. We further determined that DSF interrupts the interaction between SMAD3 and TGF-β receptor Ι (TBR Ι), and identified that DSF directly binds with SMAD3, in which Trp326, Thr330, and Cys332 of SMAD3 are critical binding sites for DSF. Collectively, our results reveal a powerful anti-fibrotic function of DSF in pulmonary fibrosis through the inhibition of TGF-β/SMAD signalling in pulmonary fibroblasts, indicating that DSF is a promising therapeutic candidate for IPF.
Idiopathic pulmonary fibrosis (IPF) is a chronic and irreversible lung disease with limited therapeutic strategies. Lycorine (LYC), an alkaloid isolated from Amaryllidaceae family plants, exhibits effective anti-inflammatory, antiviral, and anti-tumor activities. In this study, we attempted to determine the effect of LYC on bleomycin (BLM)-induced IPF and NLRP3 inflammasome activation. Our results demonstrated that the LYC treatment ameliorated BLM-induced pulmonary fibrosis and inflammation in mice. LYC inhibited active Caspase-1 expression and lactate dehydrogenase (LDH) release during BLM-induced acute lung injury (ALI) in mice. Furthermore, our in vitro assay showed that LYC inhibited LPS/Nigericin- or LPS/ATP-induced NACHT, LRP and PYD domains-containing protein 3 (NLRP3) inflammasome activation, and pyroptosis in bone marrow-derived macrophages (BMDMs). Mechanically, LYC could disturb the interaction of NLRP3 with apoptosis-associated speck-like protein containing a CARD (ASC) by targeting the pyrin domain (PYD) on Leu9, Leu50, and Thr53. Our findings indicate that LYC ameliorated BLM-induced pulmonary fibrosis by inhibiting NLRP3 inflammasome activation and pyroptosis through targeting the PYD domain of ASC. Thus, LYC might be a potential therapeutic agent for pulmonary inflammation and fibrosis.
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