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H-2 class I loci determine sensitivity to MCMV in macrophages and fibroblasts
Authors:Patricia Price  Anne E Gibbons  Geoffrey R Shellam
Institution:(1) Department of Microbiology, University of Western Australia, 6009 Nedlands, WA, Australia
Abstract:Peritoneal (PM) and bone marrow-derived (BMM) macrophages and lung fibroblasts (LF) from inbred, intra-H-2 recombinant, H-2 mutant, and hybrid mice were infected with murine cytomegalovirus (MCMV) under centrifugal enhancement. At the concentration of virus employed, peritoneal macrophages from strains carrying Kd, Kb, Dd, KS and/or Ds, K4 and/or D4 alleles could be infected to a level of 80%–100%, as assessed by viral antigen expression or loss of Fc receptors. Cells lacking these haplotypes and carrying Kk, Kf, Dk, Df, or Db were resistant, yielding levels of infection below 20% . The background (non-H-2) and class II genotype and the S allele did not influence the proportions of cells infected. Furthermore, sensitivity was dominant in the F, progeny of H-2 b x H-2 k and H-2d x H-2 k crosses, and was not compromised by thebm1, bm3, bm10, or bm14 mutations in the al oragr2 regions of Kb orD b. The proportions of cells able to release infectious virus were low, but paralleled the frequencies of viral antigen expression. The class I genotype also determined susceptibility to MCMV infection in BMM and LF, although up to 35% of H-2 k BMM and 46% of H-2 k LF could be infected. The findings are consistent with an association between K and D antigens and a cellular receptor for MCMV on all three cell types.
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