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PLoS One. 2014 Apr 16;9(4):e95103. doi: 10.1371/journal.pone.0095103. eCollection 2014.

Strong vaccine-induced CD8 T-cell responses have cytolytic function in a chimpanzee clearing HCV infection.

Author information

  • 1Department of Virology, Biomedical Primate Research Centre, Rijswijk, The Netherlands.
  • 2Department of Comparative Genetics and Refinement, Biomedical Primate Research Centre, Rijswijk, The Netherlands.
  • 3Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom.

Abstract

A single correlate of effective vaccine protection against chronic HCV infection has yet to be defined. In this study, we analyzed T-cell responses in four chimpanzees, immunized with core-E1-E2-NS3 and subsequently infected with HCV1b. Viral clearance was observed in one animal, while the other three became chronically infected. In the animal that cleared infection, NS3-specific CD8 T-cell responses were observed to be more potent in terms of frequency and polyfunctionality of cytokine producing cells. Unique to this animal was the presence of killing-competent CD8 T-cells, specific for NS3 1258-1272, being presented by the chimpanzee MHC class I molecule Patr-A*03∶01, and a high affinity recognition of this epitope. In the animals that became chronically infected, T-cells were able to produce cytokines against the same peptide but no cytolysis could be detected. In conclusion, in the animal that was able to clear HCV infection not only cytokine production was observed but also cytolytic potential against specific MHC class I/peptide-combinations.

PMID:
24740375
[PubMed - in process]
PMCID:
PMC3989318
Free PMC Article
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