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. 1995 Apr;69(4):2525–2533. doi: 10.1128/jvi.69.4.2525-2533.1995

The predominant virus antigen burden is present in macrophages in Theiler's murine encephalomyelitis virus-induced demyelinating disease.

H L Lipton 1, G Twaddle 1, M L Jelachich 1
PMCID: PMC188929  PMID: 7884902

Abstract

Theiler's murine encephalomyelitis virus (TMEV) produces a persistent central nervous system infection and chronic, inflammatory demyelinating disease in susceptible mice. TMEV antigen(s) and RNA genome have been detected in astrocytes, oligodendrocytes, and macrophages during persistence. Whether there is a predominant cell type in which TMEV persists has not been resolved. Since TMEV-induced demyelinating lesions are infiltrated with macrophages and a number of other persistent viruses show near-exclusive tropism for these phagocytic cells, we used two-color immunofluorescent staining with conventional and confocal microscopy to colocalize TMEV to cells that stain with monoclonal antibodies (MOMA-2) [unknown antigen], Mac-1 [CD11b], FA-11 [CD66], and 2F8 [scavenger receptor]) to macrophages in BeAn-infected SJL mice. A predominant virus antigen burden within macrophages infiltrating demyelinating lesions was seen. A dichotomy of cells staining for virus antigen(s) was found with infected cells containing either a large or small virus antigen load. Ninety percent of cells with a large virus antigen load were large phagocytes (20 to 50 microns) that were readily detected at low power (5x objective). Cells with smaller amounts of virus antigen(s) turned out to be either these same large phagocytic cells or much smaller cells, approximately equal to 10 microns in diameter. Forty percent of cells with a small virus antigen load were macrophages. The unidentified approximately equal to 10-microns cells that are virus antigen positive and macrophage negative in this study could still be macrophages, or they may be oligodendrocytes. The fact that virus was detected in the cytoplasm and not phagolysosomes of macrophages and the sheer mass of fluorescently stained virus proteins in some macrophages suggest that TMEV persists in these phagocytic cells by active virus replication.

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Selected References

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