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Oncotarget. 2018 Jun 12;9(45):27858-27871. doi: 10.18632/oncotarget.25559. eCollection 2018 Jun 12.

Interferon-stimulated gene 20 kDa protein serum levels and clinical outcome of hepatitis B virus-related liver diseases.

Van Tong H1,2,3, Hoan NX3,4,5, Binh MT3,4,5, Quyen DT3,4,5, Meyer CG3,5,6, Song LH4,5, Toan NL2, Velavan TP3,5,6.

Author information

1
Institute of Biomedicine and Pharmacy, Vietnam Military Medical University, Hanoi, Vietnam.
2
Department of Pathophysiology, Vietnam Military Medical University, Hanoi, Vietnam.
3
Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany.
4
108 Military Central Hospital, Hanoi, Vietnam.
5
Vietnamese-German Center of Excellence in Medical Research, Hanoi, Vietnam.
6
Duy Tan University, Da Nang, Vietnam.

Abstract

Interferon-stimulated gene 20 kDa protein (ISG20) with 3' to 5' exonuclease activity mainly targeting single-stranded RNA plays an important role in immune responses against various infectious pathogens, including hepatitis viruses. ISG20 levels were measured by ELISA assays in sera of 339 hepatitis B-virus (HBV) infected patients and 71 healthy individuals and were correlated with clinical and laboratory parameters. ISG20 mRNA was quantified by qRT-PCR in 30 pairs of hepatocellular carcinoma (HCC) tumour and adjacent non-tumour liver tissues. ISG20 levels were significantly elevated in HBV patients compared to healthy controls (P<0.0001). In the patient group, varying ISG20 levels were associated with different forms of HBV-related liver diseases. ISG20 levels were higher in patients with HCC compared to those without HCC (P<0.0001), and increased according to the stages of HCC (P<0.0001). ISG20 mRNA expression was up-regulated in tumour tissues compared to the expression in adjacent non-tumour tissues (P=0.017). Importantly, ISG20 levels were strongly correlated with the levels of AST, ALT, total and direct bilirubin among HCC patients (Pearson's r = 0.43, 0.35, 0.34, 0.3; P<0.0001, respectively). Although differences between liver cirrhosis (LC) and non-LC patients were not observed, ISG20 levels were elevated according to the progression of cirrhosis in patients with LC plus HCC (P=0.005). In conclusions, ISG20 levels are induced by HBV infection and significantly associated with progression and clinical outcome of HBV-related liver diseases, especially in patients with HCC. ISG20 might be a potential indicator for liver injury and the clinical outcome in HBV-related HCC.

KEYWORDS:

ISG20 expression; ISG20 levels; hepatocellular carcinoma; interferon-stimulated gene; viral hepatitis

Conflict of interest statement

CONFLICTS OF INTEREST All authors have no conflicts of interest to declare.

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