Visualizing production of beta interferon by astrocytes and microglia in brain of La Crosse virus-infected mice.
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Authors
Kallfass, CarstenAckerman, Andreas
Lienenklaus, Stefan
Weiss, Siegfried
Heimrich, Bernd
Staeheli, Peter
Issue Date
2012-10
Metadata
Show full item recordAbstract
Beta interferon (IFN-β) is a major component of innate immunity in mammals, but information on the in vivo source of this cytokine after pathogen infection is still scarce. To identify the cell types responsible for IFN-β production during viral encephalitis, we used reporter mice that express firefly luciferase under the control of the IFN-β promoter and stained organ sections with luciferase-specific antibodies. Numerous luciferase-positive cells were detected in regions of La Crosse virus (LACV)-infected mouse brains that contained many infected cells. Double-staining experiments with cell-type-specific markers revealed that similar numbers of astrocytes and microglia of infected brains were luciferase positive, whereas virus-infected neurons rarely contained detectable levels of luciferase. Interestingly, if a mutant LACV unable of synthesizing the IFN-antagonistic factor NSs was used for challenge, the vast majority of the IFN-β-producing cells in infected brains were astrocytes rather than microglia. Similar conclusions were reached in a second series of experiments in which conditional reporter mice expressing the luciferase reporter gene solely in defined cell types were infected with wild-type or mutant LACV. Collectively, our data suggest that glial cells rather than infected neurons represent the major source of IFN-β in LACV-infected mouse brains. They further indicate that IFN-β synthesis in astrocytes and microglia is differentially affected by the viral IFN antagonist, presumably due to differences in LACV susceptibility of these two cell types.Citation
Visualizing production of beta interferon by astrocytes and microglia in brain of La Crosse virus-infected mice. 2012, 86 (20):11223-30 J. Virol.Affiliation
Department of Virology, University of Freiburg, Freiburg, Germany.Journal
Journal of virologyPubMed ID
22875966Type
ArticleLanguage
enISSN
1098-5514ae974a485f413a2113503eed53cd6c53
10.1128/JVI.01093-12
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