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Journal of Virology, October 2000, p. 9267-9280, Vol. 74, No. 19
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Chemokine Gene Expression in Astrocytes of Borna Disease Virus-Infected Rats and Mice in the Absence of Inflammation

Christian Sauder,1 Wiebke Hallensleben,1 Axel Pagenstecher,2 Stefanie Schneckenburger,1 Laszlo Biro,1 Doris Pertlik,3 Jürgen Hausmann,1 Mark Suter,3 and Peter Staeheli1,*

Abteilung Virologie, Institut für Medizinische Mikrobiologie und Hygiene, Universität Freiburg, D-79104 Freiburg,1 and Abteilung Neuropathologie, Universität Freiburg, D-79106 Freiburg,2 Germany, and Institut für Virologie, Universität Zürich, CH-8057 Zürich, Switzerland3

Received 4 February 2000/Accepted 28 June 2000

Borna disease virus (BDV) causes CD8+ T-cell-mediated meningoencephalitis in immunocompetent mice and rats, thus providing a valuable animal model for studying the mechanisms of virus-induced central nervous system (CNS) immunopathology. Chemokine-mediated leukocyte recruitment to the CNS is a crucial step in the development of neurological disease. We found increased mRNA levels of IP-10 and other chemokines in brains of adult rats following infection with BDV. The marked increase in chemokine gene expression at about day 8 postinfection seemed to immediately precede the inflammatory process. In brains of rats infected as newborns, in which inflammation was only mild and transient, sustained expression of IP-10 and RANTES genes was observed. In situ hybridization studies revealed that astrocytes were the major source of IP-10 mRNAs in brains of rats infected as newborns and as adults. In brains of infected mice lacking CD8+ T cells (beta 2m0/0), transcripts encoding IP-10 and RANTES were also observed. IP-10 transcripts were also present in a small number of scattered astrocytes of infected knockout mice lacking mature B and T cells as well as functional alpha/beta and gamma interferon receptors, indicating that BDV can induce chemokine synthesis in the absence of interferons and other B- or T-cell-derived cytokines. These data provide strong evidence that CNS-resident cells are involved in the early localized host immune response to infection with BDV and support the concept that chemokines are pivotal for the initiation of virus-induced CNS inflammation.

* Corresponding author. Mailing address: Department of Virology, University of Freiburg, Hermann-Herder-Str. 11, D-79104 Freiburg, Germany. Phone: 49-761-203-6579. Fax: 49-761-203-6562. E-mail: staeheli{at}ukl.uni-freiburg.de.

Journal of Virology, October 2000, p. 9267-9280, Vol. 74, No. 19
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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