Characterization of T cells expanded in vivo during primary mouse hepatitis virus infection in mice.
After intraperitoneal infection with mouse hepatitis virus, strain JHM (JHMV), JHMV replicated in the spleen of C57BL/6 mice for a few days but cleared within a week. The acute viral clearance coincided with moderate expansion of CD8+T cells and modest expansion of CD4+T cells, and was impaired moderately in mice depleted of CD8+T cells and completely in mice depleted of both CD4+ and CD8+T cell subsets. Flow cytometric analysis showed that expression of cell surface markers on the spleen T cells changed during JHMV infection. CD8+T cells expressing increased amounts of CD11a, CD43, CD44 and CD49d, and those expressing decreased levels of T cell receptor alpha beta, CD8, CD45RB and L-selectin were expanded in the spleen after JHMV infection. However, they did not express CD11b, CD25 or NK1.1. They used highly heterogenous V beta chains for their T cell receptors. In addition to CD11ahighCD8+T cells, CD11ahighCD4+T cells were detected transiently after JHMV infection. The virus-specific cytotoxic T lymphocyte (CTL) activity was observed in both CD4+ and CD8+ spleen T cells from mice 7 days post-infection. The present study shows the dynamics of CD8+ and CD4+T cells in the spleen during JHMV infection in mice and suggests that CD11ahighT cells may be involved in JHMV clearance in vivo because their appearance was temporally correlated with T cell-mediated viral clearance in vivo and antiviral CTL activity in vitro.
Kyuwa
S
S
Department of Animal Pathology, University of Tokyo, Japan.
Machii
K
K
Okumura
A
A
Toyoda
Y
Y
D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D018352:Coronavirus Infections / Q000276:immunology*; D005434:Flow Cytometry; D006524:Hepatitis, Viral, Animal / Q000276:immunology*; D016130:Immunophenotyping; D008212:Lymphocyte Depletion; D051379:Mice; D008810:Mice, Inbred C57BL; D006517:Murine hepatitis virus / Q000276:immunology / Q000502:physiology; D013154:Spleen / Q000276:immunology / Q000821:virology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors; D014779:Virus Replication