重组人脂联素基因在L02细胞中的表达及其对肝脂肪变的预防作用

目的 观察携带人脂联素(AdipoQ)基因真核表达载体是否能在人正常肝细胞株L02中表达,并探讨其对体外诱导肝细胞脂肪变的预防作用及其意义,为AdipoQ在非酒精性脂肪肝病的基因治疗中奠定基础.方法 将构建含人AdipoQ重组载体pEGFP-N1-AdipoQ转染L02细胞(L02/pEGFP-N1-AdipoQ组,n=10),与pEGFP-N1空质粒转染L02细胞(L02/pEGFP-N1组,n=10)以及L02正常细胞株(L02组,n=10)为对照,分别加入浓度为20 μg/ml的油酸进行培养72h,用油红O染色观察细胞内脂滴,并检测细胞内甘油三酯(TG)、游离脂肪酸(FFA)和甘油的含量.采用SAS8.2软件进行统计分析,3组之间总体差异的检验采用单因素方差分析,3组之间两两比较采用SNK-q检验.结果 含人AdipoQ重组载体pEGFP-N1-AdipoQ能够在L02细胞株中表达,油红O染色显示72 h L02组和L02/pEGFP-N1组分别比L02/pEGFP-N1-AdipoQ组脂肪变性更为明显.L02组,L02/pEGFP-N1组和L02/pEGFP-N1-AdipoQ组,TG含量分别为(89.23±18.45)μmol/L、(78.66±16.38)μmol/L和(26.58±7.65)μmol/L,FFA含量分别为(85.39±17.26)μmol/L、(75.63±12.25)μmol/L和(25.37±8.73)μmol/L,甘油含量分别为(62.29±13.59)μmol/L、(57.35±18.43)μmol/L和(15.37±7.53)μmol/L,F值分别为50.58、59.37、34.32,P值均<0.01.在L02/pEGFP-N1组中TG、FFA和甘油含量均明显高于L02/pEGFPN1-AdipoQ组,t值分别为7.81、8.50、6.75,P值均<0.01.在L02组中TG、FFA和甘油含量均显著高于L02/pEGFP-N1-AdipoQ组,t值分别为9.39、10.15、7.54,P值均<0.01.TG、FFA和甘油含量在L02/pEGFP-N1组和L02组之间,差异无统计学意义.结论 携带人脂联素基因真核表达载体能够在L02细胞株中表达,而且具有预防肝脂肪变性的作用.

Overxpression of adiponectin prevents hepatocyte steatosis

Objective To investigate the effect of adiponectin on hepatoyte steatosis.Methods L02 cells were transfected with pEGFP-N1-AdipoQ,a plasmid encoding pEGFP-adiponectin fusion protein,or pEGFP-N1.Lipid droplets in the hepatocytes were observed by oil red staining at 72 h.The contents of TG,FFA and glycerol in hepatocytes were measured.Results Compared to cells transfected with pEGFP-N1AdipoQ plasimd,much more lipid droplets were observed in cells transfected with pEGFP-N1 plasmid.TG,FFA and glycerol contents in L02 cells and L02/pEGFP-N1 cells were significantly higher than those in L02/pEGFP-N1-AdipoQ cells.Conclusions Overexpression of adiponectin prevent hepatocyte steatosis.