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Cross reactive cellular immune response to HCV genotype 1 and 4 antigens among genotype 4 exposed subjects.


ABSTRACT:

Background

Hepatitis C Virus (HCV) infection is a global health burden particularly in Egypt, where HCV genotype 4a (GT-4a) predominates. The prevention and control of HCV infection will remain a challenge until the development of an effective vaccine that protects against different genotypes. Several HCV GT-1-based vaccines are in different stages of clinical trials, but antigenic differences could make protection against other genotypes problematic. In this regard, data comparing the cell-mediated immune (CMI) response to different HCV genotypes are limited. We aimed to ex vivo investigate whether GT-1-based vaccine may protect against HCV GT-4 infections. This was carried out on samples collected from genotype 4 infected/exposed subjects.

Methods/principal findings

The CMI responses of 35 subjects; infected with HCV GT-4/or who had spontaneously-resolved the infection and 10 healthy control subjects; to two sets of seven HCV overlapping 15-mer peptide pools derived from both genotypes; and covering most of the viral proteins; were evaluated. This was carried out using an interferon gamma (IFN?) enzyme-linked immunospot (ELISpot) assay. Peripheral blood mononuclear cells (PBMC) from 17 subjects (48%) responded to at least one peptide pool derived from GT-1b/GT-4a with 13 subjects responding to peptide pools from both genotypes. A strong correlation was found in the responses to both genotypes (r?=?0.82, p<0.001; 95% confidence interval?=?0.562-0.933). The average IFN? total spot forming cells (SFC)/10(6) PBMC (±SE) from the responding subjects for GT-1b and GT-4a was 216±56 and 199±55, respectively (p?=?0.833). Also, there were no significant differences between those who cleared their HCV infection or who remained HCV-RNA positive (p?=?0.8).

Conclusion/significance

Our data suggest that an effective GT-1b vaccine could protect from GT-4a infection. These data could help in HCV rationale vaccine design and efficacy studies and further our understanding of HCV cross protection against different genotypes.

SUBMITTER: Galal IF 

PROVIDER: S-EPMC4076338 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Cross reactive cellular immune response to HCV genotype 1 and 4 antigens among genotype 4 exposed subjects.

Galal Iman F IF   Zakaria Zainab Z   Allam Walaa R WR   Mahmoud Mohamed A MA   Ezzat Ahmed R AR   Osman Ahmed A   Waked Imam I   Strickland G Thomas GT   Abdelwahab Sayed F SF  

PloS one 20140630 6


<h4>Background</h4>Hepatitis C Virus (HCV) infection is a global health burden particularly in Egypt, where HCV genotype 4a (GT-4a) predominates. The prevention and control of HCV infection will remain a challenge until the development of an effective vaccine that protects against different genotypes. Several HCV GT-1-based vaccines are in different stages of clinical trials, but antigenic differences could make protection against other genotypes problematic. In this regard, data comparing the c  ...[more]

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