CD4+ T cells specific for a model latency-associated antigen fail to control a gammaherpesvirus in vivo.
Eur J Immunol
; 36(12): 3186-97, 2006 Dec.
Article
em En
| MEDLINE
| ID: mdl-17109468
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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Infecções Tumorais por Vírus
/
Linfócitos T CD4-Positivos
/
Latência Viral
/
Rhadinovirus
/
Infecções por Herpesviridae
/
Epitopos de Linfócito T
/
Antígenos Virais
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
Eur J Immunol
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Reino Unido