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Pathogenesis of Semliki Forest virus encephalitis
1Centre for Infectious Diseases, University of Edinburgh, Summerhall, Edinburgh, United Kingdom. John.Fazakerley@ed.ac.uk
Journal of Neurovirology
|December 20, 2002
Summary
Semliki Forest virus (SFV) encephalitis pathogenesis in mice depends on age and viral strain. Immature neurons support replication, while mature neurons develop persistent infections, influenced by neuronal dedifferentiation and genetic factors.
Area of Science:
- Neurovirology
- Immunology
- Pathogenesis
Background:
- Semliki Forest virus (SFV) causes encephalitis with variable outcomes in mice.
- Infection severity and type depend on host age and viral strain.
- SFV pathogenesis involves acute encephalitis, demyelinating meningoencephalomyelitis, and persistent CNS infections.
Purpose of the Study:
- To review the pathogenesis of Semliki Forest virus (SFV) encephalitis.
- To elucidate the age- and strain-dependent variations in SFV infection outcomes.
- To understand the mechanisms underlying viral replication, neuronal apoptosis, and persistent infection.
Main Methods:
- Review of existing literature on SFV encephalitis pathogenesis.
- Analysis of age-related virulence and genetic determinants (nsp3 gene).
- Investigation of neuronal replication capacity, apoptosis, and dedifferentiation.
Main Results:
- Virulence is age-dependent; all strains are virulent in <12-day-old mice.
- The L10 strain is virulent in older mice, while A7(74) is avirulent, linked to the nsp3 gene.
- Immature neurons support replication; mature neurons develop restricted or persistent infections, modifiable by gold compounds.
Conclusions:
- Neuronal maturation restricts SFV replication, influencing disease outcome.
- Gold compounds may restore viral replication by inducing neuronal dedifferentiation.
- Immune responses, including interferon, IgM, IgG, and CD8(+) T cells, control viral spread and pathology.