Abstract: Objective To observe the change of intestinal flora on the process of nonalcoholic steatohepatitis（NASH），and to explore the synbiotics therapeutic effect on NASH. Methods Rats were administrated with high fat diet to establish NASH model．In the process of NASH rats modeling，the level of triglyceride (TG), total cholesterol (TC), high-density lipoprotein (HDL), low density lipoprotein (LDL), fasting blood sugar (FBS) and fasting insulin (FINS) was tested dynamically by automatic biochemical analyzer.The changes of main intestinal flora were detected by 16 S rRNA fluorescence quantitative polymerase chain reaction.NAFLD activity score was calculated. HE staining was used to observe the hepaticpathological changes and the TLR4 expression was detected by using enzyme-linked immunosorbent assay and immunohistochemical method. Until the 4th,8th,10th week in the process of NASH modeling, 10 rats were feeded with Synbiotics for 2 weeks, and all of above indicators were tested and observed. Results 1) With the extension of a high-fat diet feeding time, the degree of hepatocyte steatosis obviously was increased.NAFLD score was significantly heightened(P < 0.01).2)Number of independent activities of rats was significantly increased, the serological level of TG, TC, LDL, FBS and FINS were lower significantly after intervention with synbiotics for 2 weeks(P < 0.05). 3) Synbiotics intervention for two weeks could significantly increase the amount of bifidobacterium and lactobacillus and decrease the amount of enterococcus significantly(P < 0.05). 4) The expression of TLR4 was gradually increased in the process of NASH rats modeling(P < 0.05),but decreased after 2 weeks of the synbiotics-intervention (P < 0.05). Conclusions Intestinal microecology change is closely related to the development of NASH,therefor, syinbiotics could improve the quality of life and biochemical indicators of NASH rats through adjusting intestinal microecology and the expression level of TLR4 protein might been involved.

Key words: nonalcoholic steatohepatitis（NASH）, intestinal microflora, probiotics, prebiotics, synbiotics