Cd4+ T Cells Specific for a Model Latency-associated Antigen Fail to Control a Gammaherpesvirus in Vivo.
From: Division of Virology, Department of Pathology, University of Cambridge, Cambridge, UK.
European journal of immunology
- Publish Date: Dec 2006
- ISSN: 0014-2980
- Volume: 36
- Issue: 12
- Pages: 3186-97
- Medium: Print
- Language: English
- Citation (JAMA): Smith Christopher M, Rosa Gustavo T L, May Janet S, et al. Cd4+ T Cells Specific for a Model Latency-associated Antigen Fail to Control a Gammaherpesvirus in Vivo.. Eur. J. Immunol. Dec 2006;36:3186-97
Abstract
CD4(+) T cells play a major role in containing herpesvirus infections. However, their cellular targets remain poorly defined. In vitro CD4(+) T cells have been reported to kill B cells that harbor a latent gammaherpesvirus. We used the B cell-tropic murine gammaherpesvirus-68 (MHV-68) to test whether this also occurred in vivo. MHV-68 that expressed cytoplasmic ovalbumin (OVA) in tandem with its episome maintenance protein, ORF73, stimulated CD8(+) T cells specific for the H2-K(b)-restricted OVA epitope SIINFEKL and was rapidly eliminated from C57BL/6 (H2(b)) mice. However, the same virus failed to stimulate CD4(+) T cells specific for the I-A(d)/I-A(b)-restricted OVA(323-339) epitope. We overcame any barrier to the MHC class II-restricted presentation of an endogenous epitope by substituting OVA(323-339) for the CLIP peptide of the invariant chain (ORF73-IRES-Ii-OVA), again expressed in tandem with ORF73. This virus presented OVA(323-339) but showed little or no latency deficit in either BALB/c (H2(d)) or C57BL/6 mice. Latent antigen-specific CD4(+) T cells therefore either failed to recognize key virus-infected cell populations in vivo or lacked the effector functions required to control them.
Mesh Headings (Keywords): Animals, Antigens, Viral, CD4-Positive T-Lymphocytes, Cell Line, Cells, Cultured, Epitopes, T-Lymphocyte, Herpesviridae Infections, Mice, Mice, Inbred BALB C, Models, Biological, NIH 3T3 Cells, Rhadinovirus, Tumor Virus Infections, Virus Latency
Check for Full Text / PubMed Unique Identifier (PMID): 17109468
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