OBJECTIVE To explore the protective effects of 3′-daidzein sulfonate sodium on chronic hepatic injury induced by carbon tetrachloride(CCl4)in mice and investigate the mechanism about regulating the T lymphocyte subsets.METHODS Healthy Kunming male mice were randomly divided in 5groups:control group,model group,bifendate positive control group(2.5mg·kg-1),low and high dose 3′-daidzein sulfonate sodium groups(0.1and 0.3mg·kg-1).The chronic hepatic injury mice were made by intraperitoneal injection of 10% CCl4 plant oil solution twice a week,and sustained for six weeks.At the same time,the mice were treated with normal saline,bifendate(2.5mg·kg-1)and 3′-daidzein sulfonate sodium(0.1and 0.3mg·kg-1),respectively by ig administration once a day and continued for six weeks.After the last administration,the mice blood and liver were taken.Using automatic biochemical analyzer survey the activity of aspartate aminotransferase(AST)and alanine aminotransferase(ALT)in serum.Flow cytometry was used to detect T lymphocyte subsets,enzymes analysis technique was used to observe the liver function(CD3+,CD4+and CD8+),HemateinEosin stain was used to explore the changes in liver morphology.RESULTS The level of ALT and AST in the serum in model group mice increased significantly.While the level of ALT and AST in the serum in 3′-daidzein sulfonate sodium(0.1 or 0.3mg·kg-1,ig)groups mice decreased compared with the model group(P<0.05).And compared with the model group,the ratios of CD3+,CD4-CD8-and CD4+/CD8+ decreased,and the ratios of CD8+ increased in 3′-daidzein sulfonate sodium groups(0.1 and 0.3mg·kg-1,ig;P<0.05).CONCLUSION 3′-daidzein sulfonate sodium have a protective effect on CCl4-induced liver injury mice,and it can result in the changes of T lymphocyte subsets,which may be one of the factors leading to hepatic injury by CCl4. OBJECTIVE To explore the protective effects of 3’-daidzein sulfonate sodium on chronic hepatic injury induced by carbon tetrachloride (CCl4) in mice and investigate the mechanism about regulating the T lymphocyte subsets. METHODS Healthy Kunming male mice were randomly divided in 5 groups: control group , model group, bifendate positive control group (2.5 mg · kg -1), low and high dose 3’-daidzein sulfonate sodium groups (0.1 and 0.3 mg · kg -1). The chronic hepatic injury mice were made by intraperitoneal injection of At the same time, the mice were treated with normal saline, bifendate (2.5 mg · kg -1) and 3’-daidzein sulfonate sodium (0.1 and 0.3 mg · Kg-1), respectively by ig administration once a day and continued for six weeks. After the last administration, the mice blood and liver were taken. Using automatic biochemical analyzer survey the activity of aspartate aminotransferase (AST) and alanine aminotransferase (ALT ) in serum. Flow cytometry was used to detect T lymphocyte subsets, enzymes analysis technique was used to observe the liver function (CD3 +, CD4 + and CD8 +), HemateinEosin stain was used to explore the changes in liver morphology .RESULTS The level of ALT and AST in the serum in model group mice increased significantly. Whilst the level of ALT and AST in the serum in 3’-daidzein sulfonate sodium (0.1 or 0.3 mg · kg -1, ig) groups mice decreased compared with the model group (P <0.05) compared with the model group, the ratios of CD3 +, CD4-CD8- and CD4 + / CD8 + decreased, and the ratios of CD8 + increased in 3’-daidzein sulfonate sodium groups (0.1 and 0.3 mg · kg -1, ig; P <0.05 ) .CONCLUSION 3’-daidzein sulfonate sodium have a protective effect on CCl4-induced liver injury mice, and it can result in the changes of T lymphocyte subsets, which may be one of the factors leading to hepatic injury by CCl4.