Lack of both Fas ligand and perforin protects from flavivirus-mediated encephalitis in mice

被引:82
作者
Luna, RML
Lee, E
Müllbacher, A
Blanden, RV
Langman, R
Lobigs, M [1 ]
机构
[1] Australian Natl Univ, John Curtin Sch Med Res, Div Cell Biol & Immunol, Canberra, ACT 2601, Australia
[2] Salk Inst Biol Studies, Conceptual Immunol Grp, La Jolla, CA USA
关键词
D O I
10.1128/JVI.76.7.3202-3211.2002
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The mechanism by which encephalitic flaviviruses enter the brain to inflict a life-threatening encephalomyelitis in a small percentage of infected individuals is obscure. We investigated this. issue in a mouse model for flavivirus encephalitis in which the virus was administered to 6-week-old animals by the intravenous route, analogous to the portal of entry in natural infections, using a virus dose in the. range experienced following the bite of an infectious mosquito. In this model, infection with 0.1 to 10(5) PFU of virus gave mortality in similar to50% of animals despite low or undetectable virus growth in extraneural tissues. We show that the cytolytic effector functions play a crucial role in invasion of the encephalitic flavivirus into the brain. Mice deficient in either the granule exocytosis- or Fas-mediated pathway of cytotoxicity showed delayed and reduced mortality. Mice deficient in both cytotoxic effector functions were resistant to a low-dose peripheral infection with the neurotropic virus.
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页码:3202 / 3211
页数:10
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