期刊
ARCHIVES OF VIROLOGY
卷 158, 期 5, 页码 1039-1046出版社
SPRINGER WIEN
DOI: 10.1007/s00705-012-1579-1
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资金
- Ministry of Education, Culture, Sports, Sciences and Technology of Japan [22780268]
- Ministry of Health, Labour and Welfare of Japan
- Grants-in-Aid for Scientific Research [23590554, 13J01563, 22780268] Funding Source: KAKEN
Tick-borne encephalitis virus (TBEV) is a zoonotic agent that causes fatal encephalitis in humans. 2'-5'-oligoadenylate synthetase 1b (Oas1b) has been identified as a flavivirus resistance gene, but most inbred laboratory mice do not possess a functional Oas1b gene. In this study, a congenic strain carrying a functional Oas1b gene, B6.MSM-Oas, was used to evaluate the pathogenicity of Far-Eastern TBEV. Although intracerebral infection of B6.MSM-Oas mice by Oshima 5-10 resulted in limited signs of illness, infection by Sofjin-HO resulted in death with severe neurologic signs. While Oshima 5-10 was cleared from the brain, Sofjin-HO was not cleared despite a similar level of expression of the intact Oas1b gene. Necrotic neurons with viral antigens and inflammatory reactions were observed in the brain infected with Sofjin-HO. These data indicate that the different susceptibility to the antiviral activity of Oas1b resulted in a difference in neurovirulence in the two TBEV strains.
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