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To investigate the therapeutic effect and molecular mechanism of the main flavonoid components of Silybum marianum (S. marianum) on nonalcoholic fatty liver disease (NAFLD), we identified nine flavonoids in S. marianum through TCMSP, PubChem database and corresponding literatures. The potential therapeutic targets of NAFLD were predicted by SwissTargetPrediction, GeneCards and Venny 2.1.0 platform, while the protein-protein interaction (PPI) network of potential targets was analyzed using String platform and Cytoscape software. Then GO and KEGG pathway enrichment analysis were performed using David 6.8 database, followed by molecular docking verification using AutoDock software. In vitro, components with higher degree value in the "components-targets-pathway" network were chosen for further analysis. L02 cells were used to establish lipid accumulation model and treated with different components. Furthermore, the effects of four pure active compounds from S. marianum on lipid accumulation in hepatocytes were analyzed by oil red O staining. The results showed that the main nine flavonoids extracted from S. marianum contained 24 potential NAFLD targets. Several critical pathways closely related to NAFLD process were identified by GO and KEGG enrichment analysis, including phosphatidylinositol 3-kinase-protein kinase B (PI3K-Akt) pathway, type 2 diabetes pathway, tumor necrosis factor (TNF) pathway and insulin resistance pathway. The results of molecular docking further indicated that the core components displayed strong binding abilities with key targets respectively, and silandrin showed better binding activity as compared to other components. The results obtained from L02 cells showed that the lipid accumulation was reduced by treatment with isosilybin A, isosilybin B, silydianin and silychristin, while the activity of isosilybin B was better than that of isosilybin A. Taken together, we concluded that the main flavone components of S. marianum could improve lipid accumulation through multiple signaling pathway in hepatocytes, and this could be a potential new strategy for the treatment of NAFLD.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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