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. 1996 Oct;70(10):6856–6861. doi: 10.1128/jvi.70.10.6856-6861.1996

Theiler's murine encephalomyelitis virus kills restrictive but not permissive cells by apoptosis.

M L Jelachich 1, H L Lipton 1
PMCID: PMC190733  PMID: 8794327

Abstract

Theiler's murine encephalomyelitis viruses (TMEV), genus Cardiovirus, family Picorniviridae, are natural enteric pathogens of mice which cause central nervous system demyelination similar to that seen in multiple sclerosis. TMEV can be classified into two groups based on neurovirulence: a highly virulent group, e.g., GDVII virus, and a less virulent group, e.g., BeAn virus. Both viruses, depending on the multiplicity of infection, produced cytopathology in BSC-1 cells similar to that in BHK-21 cells. Since apoptosis has been reported as a mechanism of cell death after infection with many viruses, we examined infected BHK-21 and BSC-1 cells for morphological and biochemical changes consistent with apoptosis. Only the restrictive BSC-1 cells showed evidence of nuclear morphology and internucleosomal DNA degradation indicative of apoptosis. Interestingly, the more virulent GDVII virus was at least 50-fold more efficient in inducing apoptosis than the less virulent BeAn virus. This difference was not due to greater GDVII viral RNA replication or production of infectious virus, since the two viruses were similarly restricted in BSC-1 cells. Apoptosis in BSC-1 cells appears to be triggered by a cytoplasmic event, since inactivation of GDVII viral RNA by UV light abolished the ability of the virus to induce apoptosis. The possible role of apoptosis in the pathogenesis of TMEV infection in mice, especially virus persistence in central nervous system macrophages, is discussed.

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Selected References

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