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American Journal of Pathology, Vol 150, 1089-1100, Copyright © 1997 by American Society for Investigative Pathology

REGULAR ARTICLES

Effect of a retroviral immunodeficiency syndrome on murine cytomegalovirus-induced hepatitis

CD Peacock, SD Olver and P Price
Department of Microbiology, University of Western Australia, Nedlands, Australia.

We have studied the effects of LP-BM5 MuLV-induced murine acquired immunodeficiency syndrome (MAIDS) on concomitant murine cytomegalovirus (MCMV) infection in the livers of C57BL mice. A delayed inflammatory response in livers of mice with MAIDS (M+) on day 4 was associated with impaired clearance of MCMV-infected cells 6 days after infection. This correlated with increased levels of inflammation and serum alanine transaminase. The latter reflects enhanced hepatic necrosis, which was evident histologically. Delayed-type hypersensitivity responses to MCMV antigen were unimpaired in M+ mice and were mediated by CD8+ cells. Depletion of NK1.1+ cells from M+ mice increased MCMV replication and associated liver damage on day 6, whereas CD8+ depletion had little effect. In contrast, in the presence of CD8+ cells M- C57BL mice did not require NK1.1+ cells for control of hepatic MCMV infection, but dual NK1.1+ and CD8+ depletion dramatically potentiated hepatic MCMV replication. Our results suggest that M+ mice may acquire non-NK1.1+ and non-CD8+ cells that are able to partially control hepatic MCMV infection. These findings are discussed with reference to mortality in M+ mice after high-dose MCMV infection, as this is initially delayed but ultimately higher than in M- controls.


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Copyright © 1997 by the American Society for Investigative Pathology.