Canadian Journal of Gastroenterology and Hepatology

Canadian Journal of Gastroenterology and Hepatology / 2013 / Article

Original Article | Open Access

Volume 27 |Article ID 562765 | https://doi.org/10.1155/2013/562765

Sherif El-Saadany, Dina H Ziada, Hanan El Bassat, Wael Farrag, Hesham El-Serogy, Manal Eid, Manal Abdallah, Medhat Ghazy, Hoda A Salem, "The Role of Hepatic Expression of STAT1, SOCS3 and PIAS1 in the Response of Chronic Hepatitis C Patients to Therapy", Canadian Journal of Gastroenterology and Hepatology, vol. 27, Article ID 562765, 5 pages, 2013. https://doi.org/10.1155/2013/562765

The Role of Hepatic Expression of STAT1, SOCS3 and PIAS1 in the Response of Chronic Hepatitis C Patients to Therapy

Received05 Jun 2012
Accepted02 Jul 2012

Abstract

BACKGROUND: The underlying mechanisms of hepatitis C virus (HCV) resistance to treatment are unknown. Signal transducers and activators of transcription (STAT) proteins play a critical role in antiviral defense.OBJECTIVE: To explore some of the mechanisms of HCV resistance to interferon, the expression of STAT1 and its negative regulators, protein inhibitor of activated STAT (PIAS1) and suppressor of cytokine signalling (SOCS3), in liver tissues of both inteferon responders and nonresponders in chronic HCV patients.METHODS: Sixty patients were divided into the following groups: group 1a comprised 38 treatment-responder chronic HCV patients; group 1b consisted of 22 treatment-nonresponder chronic HCV patients; and group 2 consisted of six control subjects. Liver biopsies were examined for histological scoring; STAT1, SOCS3 and PIAS1 expression was analyzed using Western blotting methods.RESULTS: STAT1 expression in the liver tissue of patients in group 1 was significantly increased compared with group 2 patients (P=0.001), while no significant difference in expression was observed between group 1a and group 1b patients (P=0.747). However, phosphorylated STAT1 protein was expressed at a significantly higher level in liver tissue of patients in group 1a compared with patients in group 1b (P=0.001). Western blot analysis of PIAS1 and SOCS3 protein expression in liver tissues from groups 1 and 2 revealed significantly increased expression in group 1 compared with group 2 (P=0.001). In addition, PIAS1 and SOCS3 protein expression was significantly higher in the liver tissues of patients in group 1b compared with patients in group 1a.CONCLUSION: Levels of STAT1 and/or the protein expression of its negative regulators, PIAS1 and SOCS3, may be a good predictor of response to therapy. These could be used as biomarkers that are easily detected by Western blotting or immunostaining during standard histopathological liver biopsy analysis.

Copyright © 2013 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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