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Published in: Hepatology International 2/2011

01-06-2011 | Original Article

Combined effect of pro- and anti-inflammatory cytokine gene polymorphisms on susceptibility to liver cirrhosis in Tunisian HCV-infected patients

Authors: Nadia Bouzgarrou, Elham Hassen, Olfa Bahri, Sallouha Gabbouj, Nabil Ben Mami, Henda Triki, Lotfi Chouchane

Published in: Hepatology International | Issue 2/2011

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Abstract

Purpose

Chronic hepatitis C progression is commonly attributed to the continuous activation of the immune response with an increased production of pro-inflammatory cytokines, leading to fibrosis and ultimately to cirrhosis. On the contrary, anti-inflammatory cytokines, mainly interleukin (IL)-10 have a modulatory effect on hepatic fibrogenesis. The association between individual polymorphisms within cytokine genes and hepatitis C outcome is often weak and non-informative. Interestingly, it has been demonstrated that a combination of specific genotypes may be a more significant and powerful approach for predicting disease risk.

Aim

This study is aimed at investigating the combined effect of single nucleotide polymorphism (SNP) in IL-18 (−607C/A, −137G/C), interferon (IFN)-γ (+874T/A) and IL-10 (−1082G/A) genes on cirrhosis risk in HCV-infected patients.

Methods

Seventy-seven chronic hepatitis C Tunisian subjects were included in this study. The patients were divided into two groups: the first included 31 non-cirrhotic patients, and the second included 46 liver cirrhosis patients. IL-18 genotyping was performed using the PCR amplification and the restriction fragment length polymorphism analysis (RFLP). IFN-γ and IL-10 polymorphisms were analyzed using the allele-specific PCR (AS-PCR).

Results

The combined high-risk genotype (IL-18 −607C/*, IL-18 −137G/*, IFN-γ +874T/*, IL-10 −1082A/A) frequency was compared between patients with and those without cirrhosis. Individuals were classified according the number of high-risk genotypes as follows: (0–2), patients with at most two high-risk genotypes; (3–4), patients with at least three of the high-risk genotypes. The logistic regression analysis showed that patients harboring 3–4 putative high-risk genotypes have a fivefold higher risk for developing cirrhosis in comparison to those harboring at most two high-risk genotypes (OR = 5.19; 95% CI = 1.49–18.05; p = 0.009).

Conclusion

Our study showed that the co-inheritance of IL-18, IFN-γ and IL-10 specific high-risk genotypes is associated with a greater risk for liver cirrhosis.
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Metadata
Title
Combined effect of pro- and anti-inflammatory cytokine gene polymorphisms on susceptibility to liver cirrhosis in Tunisian HCV-infected patients
Authors
Nadia Bouzgarrou
Elham Hassen
Olfa Bahri
Sallouha Gabbouj
Nabil Ben Mami
Henda Triki
Lotfi Chouchane
Publication date
01-06-2011
Publisher
Springer-Verlag
Published in
Hepatology International / Issue 2/2011
Print ISSN: 1936-0533
Electronic ISSN: 1936-0541
DOI
https://doi.org/10.1007/s12072-010-9232-0

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