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. 1995 Aug;69(8):4769–4775. doi: 10.1128/jvi.69.8.4769-4775.1995

Induction of apoptosis of T cells by infecting mice with murine cytomegalovirus.

H Yoshida 1, H Sumichika 1, S Hamano 1, X He 1, Y Minamishima 1, G Kimura 1, K Nomoto 1
PMCID: PMC189286  PMID: 7609043

Abstract

Cytomegalovirus (CMV) is associated with several lymphocyte dysfunctions, but the precise mechanisms of the dysfunctions are still unclear. To elucidate the mechanisms, a cell cycle-DNA content analysis was performed on splenic T cells of murine CMV (MCMV)-infected BALB/c mice. T cells from mice infected with 3 x 10(3) PFU of MCMV contained a higher percentage of hypodiploid nuclei after 12 or 24 h of culture than those from naive mice. T cells from infected mice also contained a larger amount of fragmented DNA. Taken together, these results suggested that infection with MCMV induced the apoptotic cell death of T cells. This induction of apoptosis accounted for the dysfunction of lymphocytes, at least partially. Flow cytometric analysis showed that T cells as well as B cells from MCMV-infected mice expressed an augmented level of Fas antigen, an apoptosis-associated cell surface molecule, which might be the cause of the apoptosis of cells. T cells from MCMV-infected C57BL/6-lpr/lpr mice with mutations at the lpr/fas locus, however, also showed a substantial level of apoptosis, which was reproducibly lower than that seen in C57BL/6 mice. Therefore, it was suggested that the Fas-mediated pathway contributed to but was not sufficient for the induction of apoptosis and that mechanisms other than the Fas-associated pathway were also involved in the induction of apoptosis.

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Selected References

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