Hepatitis C virus non-structural protein 3 and core protein antigenic epitopes (HCV NS3/Core epitopes)

Hepatitis C virus (HCV) non-structural protein 3 (NS3) and core protein antigenic epitopes are essential targets for the host cellular immune response. NS3 is a multifunctional protein possessing protease and helicase activities required for viral polyprotein processing and RNA replication, while the core protein is a highly conserved structural component that forms the viral nucleocapsid (PubMed: 12134029). During infection, these viral proteins are processed into short peptides and presented on the surface of infected hepatocytes by Major Histocompatibility Complex (MHC) Class I and II molecules. The recognition of these peptide-MHC complexes by CD8+ cytotoxic T cells and CD4+ helper T cells is the primary mechanism for the spontaneous clearance of HCV (PubMed: 15141015). In chronic hepatitis C, these T-cell responses often become exhausted or are bypassed by viral mutations, leading to persistent infection and progressive liver disease. Therapeutic interventions, such as the yeast-based vaccine GI-5005 or the DNA vaccine ChronVac-C, are designed to stimulate robust, multi-epitope T-cell responses against these conserved regions to achieve a functional cure or enhance the efficacy of direct-acting antivirals (PubMed: 21844515, ClinicalTrials.gov: NCT01055821).

Other names

HCV NS3/Core antigensHepatitis C virus T-cell epitopesNS3/Core peptide-MHC complexesHCV NS3 and Core T-cell targets

Induction or restoration of virus-specific CD4+ and CD8+ T-cell mediated immunity to recognize and eliminate HCV-infected hepatocytes through the detection of peptide-MHC complexes (PubMed: 15141015).