双环醇对四环素诱发小鼠急性脂肪肝的保护作用

研究双环醇对四环素诱发小鼠急性脂肪肝的影响。小鼠一次腹腔注射四环素(180 mg·kg^-1) 24 h后，收集血样和肝组织，采用生化法测定肝脏甘油三酯(triglyceride，TG)、胆固醇(cholesterol，CHO)、谷胱甘肽(glutathione，GSH)含量，以及血清脂质和转氨酶水平；光谱法测定小鼠线粒体脂肪酸β-氧化速率以及肝脏极低密度脂蛋白(very low density lipoprotein，VLDL，TG)分泌速率。结果表明，双环醇(150及300 mg·kg^-1)连续灌胃给药3次可以不同程度地保护四环素引起的小鼠肝脏TG和CHO升高以及血清谷丙转氨酶(alanine aminotransferase，ALT)、谷草转氨酶(aspartate aminotransferase，AST)升高和脂质异常。双环醇(300 mg·kg^-1)还可减轻四环素诱发小鼠肝脏丙二醛(malondialdehyde，MDA)生成增加和GSH水平降低，并能抑制肝线粒体脂肪酸β-氧化速率下降。双环醇(300 mg·kg^-1)可部分逆转四环素所致小鼠肝脏VLDL(TG)分泌速率的减少。由此可见，双环醇对四环素诱发小鼠急性脂肪肝具有明显的保护作用，其作用机制与保护肝线粒体β-氧化功能、改善肝脂蛋白分泌及转运以及抑制肝脏脂质过氧化密切相关。

Protective effect of bicyclol against acute fatty liver induced by tetracycline in mice

To study the effect of bicyclol on lipid disorder and liver damage induced by tetracycline in mice, mice were given (ig) bicyclol (75, 150, and 300 mg x kg(-1)) three times before or after administration of tetracycline (180 mg x kg(-1)). The contents of hepatic lipids, MDA and GSH, serum lipids and ALT/AST levels were measured 24 hours after the injection (ip) of tetracycline. The beta-oxidation rate of hepatic mitochondrial fatty acid and hepatic secretion of VLDL were also observed. Bicyclol (150 and 300 mg x kg(-1)) provided significant protection against fatty liver by inhibiting the elevation of hepatic TG and CHO, adjusting abnormal serum lipids, inhibiting the elevation of serum ALT, AST, and ameliorating the severity of pathological changes. Furthermore, bicyclol significantly accelerated the VLDL (TG) secretion and reversed the impairment of mitochondrial oxidation, resulting in the lipid homeostasis. The increase of MDA formation and depletion of GSH that reflect lipid peroxidation induced by tetracycline were also inhibited by bicyclol administration. The results indicated that the hepatoprotection of bicyclol was mostly due to the improvement on lipid oxidation and transportation as well as the inhibition of lipid peroxidation in tetracycline-intoxicated mice.