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. 1994 Mar;68(3):1805–1811. doi: 10.1128/jvi.68.3.1805-1811.1994

Down-regulation of major histocompatibility complex class I synthesis by murine cytomegalovirus early gene expression.

A E Campbell 1, J S Slater 1
PMCID: PMC236642  PMID: 8107242

Abstract

Murine cytomegalovirus (MCMV) infection of C57BL/6 (H-2b) mice prevents priming of antigen-specific helper and cytotoxic T lymphocytes (CTL) (J. S. Slater, W. S. Futch, V. J. Cavanaugh, and A. E. Campbell, Virology 185:132-139, 1991). In vitro, MCMV infection alters presentation of antigens to antigen-specific, MHC class I-restricted CTL (A. E. Campbell, J. S. Slater, V. J. Cavanaugh, and R. M. Stenberg, J. Virol. 66:3011-3017, 1992). This is accompanied by a significant decrease in surface expression of H-2Kb and H-2Db. We therefore examined the effects of MCMV infection on the intracellular expression of H-2Kb and H-2Db by immunoprecipitation with conformation-independent antibodies. MCMV early-gene products severely repressed synthesis of H-2Kb and H-2Db. This down-regulation was not restored by gamma interferon treatment. The MCMV-induced suppression of MHC class I protein synthesis resulted in a retarded rate of accumulation of these molecules within the cell. In addition, MCMV infection prevented maturation of class I heavy chains to the fully glycosylated forms and inhibited transport of H-2Db from the endoplasmic reticulum-cis Golgi. Virus infection had no effect on the rate of degradation of the class I molecules. These results demonstrate that MCMV early-gene products down-regulate synthesis and posttranslational events in MHC class I expression, thereby limiting the number of antigen-presenting molecules within infected cells. This limitation defines a potential mechanism for regulation of MHC class I-restricted antigen presentation by MCMV.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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