amir mohammad alborzi

Hepatitis C virus (HCV) causes one of the major chronic liver diseases (CLD). Hepatitis C virus- core encoding sequence possesses an overlapping open reading frame (ORF) that expresses a protein called F or core.
The current study aimed at assessing the presence and titer of anti-core antibody (Ab) in 70 Iranian patients infected with HCV-1a, responder and non-responder groups, under combination therapy with pegylated interferon-α (PegIFN-α) plus ribavirin (RBV) using an enzyme-linked immunosorbent assay (ELISA).
In the current cohort study, HCV-1a core gene was amplified and cloned into vector followed by expressing in Escherichia coli and then, purified by ion exchange chromatography. The antibody titer of patients was evaluated before, during (12, 24, and 48 weeks), and 6 months after the end of therapy (ETR).
The seroprevalence of anti-core Ab was 75.7% in pretreatment sera. The combination therapy could induce a decline in the level of anti-core Ab in both groups of responders and non-responders. These changes were significant only in the responders (P = 0.003). The seroprevalence of anti-core Ab had no correlation with the outcome of treatment.
According to the current study results, HCV core protein elicit a specific antibody response other than the anti-core protein antibodies. The current study data also suggested that the level of anti-core antibody might be affected by the combination therapy and associated with sustained virological response (SVR). The data implied that the declining trend of anti-core Abs during the treatment might be an alternative representation of the therapeutic response in Iranian population infected with HCV.

The role of different viral proteins in the progression of the disease to cirrhosis is not completely understood. The ARFP/F protein is a newly described protein synthesized from the +1 or -2 reading frames of the core protein gene, which its function remains unknown. The purpose of this study is to detect specific antibodies to HCV-ARF/Core+1 protein in cirrhotic and non-cirrhotic patients with HCV and investigate any possible association. ARF/Core+1 recombinant proteins from HCV genotype 1a were expressed in Escherichia coli, and purified. Using an enzyme-linked immunosorbent assay, we assessed the prevalence of anti-ARF/Core+1 antibodies in 50 cirrhotic and 50 non-cirrhotic hepatitis C patients. All 50 cirrhotic patients were positive for anti-ARF/Core+1 antibody, while only 80% positive samples among non-cirrhotic patients were detected. The titer of anti-ARF/Core+1 antibody was also significantly higher in patients with cirrhosis than in non-cirrhotic patients. Compared to 80% positive samples among non-cirrhotic patients all 50 cirrhotic patients were positive for anti-ARF/Core+1 antibody and titer of anti-ARF/Core+1 antibody was significantly higher in patients with cirrhosis than in non-cirrhotic. These results suggest that ARF/Core+1 protein is associated with cirrhosis. A possible causative association between ARF/Core+1 and cirrhosis as well as the mechanism of this association needs to be further investigated.