Association between thymosin beta4 and non-alcoholic fatty liver disease.

ABSTRACT

BACKGROUND AND AIMS: non-alcoholic fatty liver disease (NAFLD) is the most common type of chronic liver injury worldwide. Some studies have shown that thymosin beta4 (Tß4) is closely related to liver diseases. Nevertheless, only a few published studies have reported the relationship between Tß4 and NAFLD. The purpose of this study was to evaluate the levels of Tß4 in patients with NAFLD compared with controls and to validate their relationship in a larger cohort. PATIENTS AND METHODS: a total of 76 NAFLD patients and 130 healthy controls were included in the study. Serum levels of Tß4, IL-6 and adiponectin were determined by ELISA. Serum glucose, insulin and lipids, as well as liver function were measured. Multivariate statistical analyses were performed via logistic regression modelling to determine the predictors with a significant relevance to NAFLD. The association between serum Tß4 and study variables was tested using correlation coefficients calculations. RESULTS: serum Tß4 content was 3.20 ± 0.98 mg/l in NAFLD patients (n = 76) and 5.53 ± 1.24 mg/l in healthy controls (n = 130); the difference between the two groups was statistically significant (p = 0.000). Multivariate logistic regression analysis identified Tß4 (OR = 0.343, 95% CI 0.240-0.491, p < 0.001), LDL (OR = 1.019, 95% CI 1.007-1.030, p = 0.001), ALT (OR = 1.021, 95% CI 1.001-1.041, p = 0.040) and IL-6 (OR = 1.443, 95% CI 1.079-1.929, p = 0.013) as independent predictors of NAFLD diagnosis. Serum Tß4 levels had a significant negative correlation with total cholesterol, TG, AST, GGT and IL-6 (p < 0.05 for all) and the correlation coefficient values were -0.163, -0.253, -0.143, -0.245 and -0.155, respectively. Serum Tß4 levels were positively correlated with serum adiponectin levels, with a correlation coefficient value of 0.143. CONCLUSION: serum Tß4 may play a defensive role in the development of NAFLD. Further studies are needed to confirm the role of Tß4 in NAFLD.