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Objectives. Schistosomiasis is a parasitic disease that affects over 142 million people worldwide. The main causes of death of schistosomiasis include liver granuloma and secondary hepatic cirrhosis resulting from severe fibrosis. Despite intensive research, controlling liver fibrosis associated with schistosomiasis remains challenging. Sedum sarmentosum total flavonoid (SSTF) is a promising agent to reduce liver fibrosis with an unknown mechanism. Thus, the objectives of this study are to validate its effect on the liver fibrosis caused by schistosomiasis and to explore the underlying molecular mechanism. Methods. Sixty male Sprague-Dawley rats were randomly divided into six groups: one group of normal control and five groups of liver fibrosis induced by schistosomiasis japonica with or without SSTF or colchicine treatment, the latter serving as the positive control. Liver tissues from each animal were harvested to observe the degree and grade of hepatic fibrosis. We also measured the expression of transforming growth factor-beta 1 (TGF-β1) and Smad7 using RT-qPCR, Western blot, and immunohistochemistry. Results. Compared with the untreated model group, groups treated with SSTF at all three tested doses had significantly reduced hepatic fibrosis (P<0.05). Each dose of SSTF also significantly reduced TGF-β1 protein expression and mRNA levels in the liver tissues (P<0.05). In contrast, the middle and high doses of SSTF significantly increased Smad7 protein expression and mRNA levels (P<0.05). Immunohistochemistry showed that each dose of SSTF reduced TGF-β1 protein expression (P<0.05). Conclusion. Our results demonstrated that SSTF alleviated schistosomiasis japonica-induced hepatic fibrosis by inhibiting the TGF-β1/Smad7 pathway.

Sedum sarmentosum Total Flavonoids Alleviate Schistosomiasis-Induced Liver Fibrosis by Altering TGF-β1 and Smad7 Expression