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The Journal of Immunology, 1999, 163: 868-874.
Copyright © 1999 by The American Association of Immunologists

Lytic Cycle T Cell Epitopes Are Expressed in Two Distinct Phases During MHV-68 Infection1

Luzheng Liu*,{dagger}, Emilio Flaño*, Edward J. Usherwood*, Sherri Surman*, Marcia A. Blackman*,{dagger} and David L. Woodland2,*,{dagger}

* Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105; and {dagger} Department of Pathology, University of Tennessee, Memphis, TN 38111

Murine herpesvirus-68 (MHV-68) is a type 2 {gamma} herpesvirus that productively infects alveolar epithelial cells during the acute infection and establishes long-term latency in B cells and lung epithelial cells. In C57BL/6 mice, T cells specific for lytic cycle MHV-68 epitope p56/Db dominate the acute phase of the infection, whereas T cells specific for another lytic cycle epitope, p79/Kb, dominate later phases of infection. To further understand this response, we analyzed the kinetics of Ag presentation in vivo using a panel of lacZ-inducible T cell hybridomas specific for several lytic cycle epitopes, including p56/Db and p79/Kb. Two distinct peaks of Ag presentation were observed. The first peak was at day 6 in the mediastinal lymph nodes and correlated with the initial pulmonary lytic infection. The second peak was at day 18 in both the mediastinal lymph nodes and spleen and correlated with the peak of latent infection. Interestingly, the p56 epitope was detected only in the mediastinal lymph nodes at day 6 after infection whereas the p79 epitope was predominantly presented in the spleen at day 18, suggesting that differential epitope presentation drives the switch in T cell responses to this virus. Phenotypic analysis of APCs at day 18 postinfection revealed that dendritic cells, macrophages, and B cells all presented lytic cycle epitopes. Taken together, the data suggest that there is a resurgence of lytic cycle Ags in the spleen, which explains the kinetics and specificity of the T cell response to MHV-68.




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