Protective Role of Cupressuflavone from Cupressus macrocarpa against Carbon Tetrachloride-Induced Hepato- and Nephrotoxicity in Mice

Abstract

The hepatoprotective and nephroprotective activity of cupressuflavone isolated from Cupressus macrocarpa was investigated against CCl₄-induced toxicity in mice. Cupressuflavone was administered (40, 80, and 160 mg/kg/day) for five days. CCl₄ was administered (0.5 mL/kg intraperitoneally) at the end of the experiment. A substantial increase (p < 0.001) in the levels of alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, lactate dehydrogenase, total bilirubin, cholesterol, creatinine, uric acid, urea, and malondialdehyde was observed in the CCl₄-treated group compared to the normal control group. In contrast, a significant reduction (p < 0.001) in glutathione and superoxide dismutase contents as well as the total protein level was evident in the CCl₄-intoxicated mice. Cupressuflavone pretreatment markedly inhibited the CCl₄-induced increase in alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, lactate dehydrogenase, cholesterol, creatinine, uric acid, urea, and malondialdehyde levels in a dose-dependent manner (p < 0.001 at all the tested doses). In addition, a significant (p < 0.001) and dose-dependent decrease in the total bilirubin levels was evident by cupressuflavone pretreatment (80 and 160 mg/kg/day) when compared to the CCl₄-intoxicated group. Furthermore, cupressuflavone administration significantly increased the activity of antioxidant parameters glutathione and superoxide dismutase as well as the serum protein levels (p < 0.001 at all the tested doses) in a dose-dependent manner. Histological observations confirmed the strong hepato- and nephroprotective activity. These findings suggest that cupressuflavone could exert a beneficial effect against oxidative stress by enhancing the antioxidant defense status, reducing lipid peroxidation, and protecting against the pathological changes induced by CCl₄ in the liver and kidney tissues. The structure of cupressuflavone was identified by NMR, UV, and HRESI-MS/MS spectral data.

Key words

Cupressus macrocarpa - Cupressaceae - hepatoprotective - nephroprotective - biflavones - lipid peroxidation

^* Both of these authors contributed equally to this article.

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