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Suosuo grape (the fruits of Vitis vinifera L) has been used for prevention and treatment of liver diseases in Uighur folk medicine in China besides its edible value. In this study, the hepatoprotective effects of total triterpenoids (VTT) and total flavonoids (VTF) from Suosuo grape were evaluated in Bacille-Calmette-Guerin- (BCG-) plus-lipopolysaccharide- (LPS-) induced immunological liver injury (ILI) in mice. Various dose groups (50, 150, and 300 mg/kg) of VTT and VTF alleviated the degree of liver injury of ILI mice, effectively reduced the BCG/LPS-induced elevated liver index and spleen index, hepatic nitric oxide (NO), and malondialdehyde (MDA) content, increased liver homogenate alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels, and restored hepatic superoxide dismutase (SOD) activity in ILI mice. VTT and VTF also significantly inhibited intrahepatic expression of Th1 cytokines (IFN-γ and IL-2) in ILI mice and increased intrahepatic expression of Th2 cytokines (IL-4 and IL-10). Moreover, the increased Bax/Bcl-2 ratio was significantly downregulated by VTT and VTF in liver tissue of ILI mice. These results are comparable to those of biphenyl dicarboxylate (DDB, the reference hepatoprotective agent) and suggest that VTT and VTF play a protective role against immunological liver injury, which may have important implications for our understanding of the immunoregulatory mechanisms of this plant.

Hepatoprotective Effects of Total Triterpenoids and Total Flavonoids from Vitis vinifera L against Immunological Liver Injury in Mice