Relevance of serum interleukin-33 and ST2 levels and the natural course of chronic hepatitis B virus infection.

Shu-Ling Huan,Shuai Gao,Kai Wang,Zhen-Li Wang,Ji-Guang Zhao

doi:10.1186/s12879-016-1543-x

Abstract

BackgroundInterleukin-33 (IL-33) and ST2 have been demonstrated to be associated with liver damage. However, their potential value in hepatitis B virus (HBV) infection remains unknown. This study was designed to investigate the change of serum IL-33 and ST2 levels in the natural course of chronic HBV infection.MethodsA total of 120 patients with chronic hepatitis B (CHB), 20 chronic hepatitis B virus carriers in immunotolerant phase and 28 healthy controls were enrolled in this study. All patients with CHB were divided into four groups according to their serum ALT levels. The serum levels of IL-33 and ST2 of all participants were determined by enzyme-linked immunosorbent assay, and compared between each two out of those six groups.ResultsNo significant differences were found in serum levels of IL-33 and ST2 between the group of CHB with ALT 1–2 upper limit of normal and the healthy controls (P = 0.354 for IL-33 and P = 0.815 for ST2). Other than that, there were significant differences when serum levels of IL-33 and ST2 were compared between any other two out of those six groups (P < 0.05, respectively). The overall correlation analysis indicated that changes of serum IL-33 and ST2 levels were positively associated with ALT levels in patients with chronic HBV infection (rs = 0.879, P < 0.001 for IL-33 and rs = 0.923, P < 0.001 for ST2). No significant differences were found when the serum levels of ALT, IL-33 and ST2 were compared between patients with HBeAg-positive CHB and HBeAg-negative CHB.ConclusionsOur study revealed that the serum levels of IL-33 and ST2 varied in different courses of chronic hepatitis B virus infection. The serum levels of IL-33 and ST2 elevated as serum ALT levels increased in patients with CHB. They might indicate liver damage for patients with CHB, just like ALT.

Highlights

Interleukin-33 (IL-33) and ST2 have been demonstrated to be associated with liver damage
We examined the levels of serum IL-33, ST2 and alanine aminotransferase (ALT) in patients with CHB, chronic hepatitis B virus carriers in immunotolerant phase and healthy controls (HC) so that we could determine whether IL-33 and ST2 had relevance with chronic HBV infection in our study
There were no significant differences in the distribution of age or gender among the six groups of participants, and there were no significant differences in the serum HBVDNA levels among the five groups of chronic HBV infection (Table 1)

Summary

Introduction

Interleukin-33 (IL-33) and ST2 have been demonstrated to be associated with liver damage. Their potential value in hepatitis B virus (HBV) infection remains unknown. This study was designed to investigate the change of serum IL-33 and ST2 levels in the natural course of chronic HBV infection. Hepatitis B virus (HBV) infection is still a major health problem worldwide. There are approximately 350 million people chronically infected with HBV globally, and they are at great risk of developing liver cirrhosis and hepatocellular carcinoma. Soluble ST2 may be useful to discern acute from chronic hepatic failure or to monitor the course and the severity of the disease. It is widely accepted that the adaptive immune responses play major roles in the clearance of HBV infection. The role of innate immunity during HBV infection appears not to be well understood, which can be attributed to the fact that the recruitment of patients in the very early, asymptomatic phase of HBV infection is very difficult [11, 12]

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