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Relationship between host age and persistence of Theiler's virus in the central nervous system of mice
Abstract:
This study has demonstrated that the ability of BeAn 8386 virus to persist in the central nervous system of mice declines with the increasing age of the host at the time of inoculation. Although persistent infection was established in 1-, 3-, 9-, and 40-week-old mice, there was a significant reduction in both the frequency of virus isolations and the mean virus titers in mice inoculated after 3 weeks of age. The incidence of clinical demyelinating disease (late disease) also decreased in animals infected after 3 weeks of age in parallel with the decline in virus persistence.
Insights
Host age significantly impacts BeAn 8386 virus persistence in the central nervous system. Older mice show reduced virus levels and lower incidence of demyelinating disease after infection.
Area of Science:
- Virology
- Neuroscience
- Immunology
Background:
- BeAn 8386 virus can establish persistent infections in the central nervous system (CNS).
- Age-related changes in host immunity can influence viral persistence and disease outcomes.
Purpose of the Study:
- To investigate the effect of host age at inoculation on BeAn 8386 virus persistence in the mouse CNS.
- To determine the correlation between viral persistence and the development of demyelinating disease.
Main Methods:
- Mice of different ages (1, 3, 9, and 40 weeks) were inoculated with BeAn 8386 virus.
- Virus isolation frequency and mean virus titers in CNS tissues were quantified.
- Incidence of clinical demyelinating disease was monitored.
Main Results:
- BeAn 8386 virus persistence in the CNS decreased with increasing host age at inoculation.
- Significant reductions in virus isolation frequency and titers were observed in mice inoculated after 3 weeks of age.
- The incidence of late-onset demyelinating disease paralleled the decline in viral persistence.
Conclusions:
- Host age is a critical factor modulating BeAn 8386 virus persistence in the CNS.
- Reduced viral persistence in older mice correlates with a lower risk of developing demyelinating disease.
- These findings highlight age-dependent host-pathogen interactions in viral-induced neurological disease.