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J Virol, May 1998, p. 4387-4395, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Virus-Specific CD4+ T Cells Eliminate Borna Disease
Virus from the Brain via Induction of Cytotoxic CD8+
T Cells
Kerstin
Nöske,1,
Thomas
Bilzer,2
Oliver
Planz,3 and
Lothar
Stitz1,3,*
Institut für Virologie,
Justus-Liebig-Universität Giessen,1
Institut für Impfstoffe, Bundesforschungsanstalt für
Viruskrankheiten der Tiere, Tübingen,3
and
Institut für Neuropathologie,
Heinrich-Heine-Universität Düsseldorf,
Düsseldorf,2 Germany
Received 5 November 1997/Accepted 3 February 1998
Persistent Borna disease virus infection of the brain can be
prevented by treatment of naive rats with a virus-specific
CD4+ T-cell line prior to infection. In rats receiving this
treatment, only a transient low-level encephalitis was seen
compared to an increasingly inflammatory reaction in untreated infected
control rats. Virus replication was found in the brain for several days after infection before the virus was cleared from the central nervous
system. The loss of infectivity from the brain was confirmed by
negative results by reverse transcription-PCR with primers for
mRNA, by in situ hybridization for both genomic and mRNA, and by
immunohistology. Most importantly, in vitro assays revealed that
the T-cell line used for transfusion had no cytotoxic capacity. The
kinetics of virus clearance were paralleled by the appearance of
CD8+ T cells and the expression of perforin in the brain.
Testing of lymphocytes isolated from the brains of CD4+
T-cell-treated rats after challenge revealed high cytotoxic activity due to the presence of CD8+ cytotoxic T cells at time
points when brain lymphocytes from infected control rats induced
low-level cytolysis of target cells. Neutralizing antiviral
antibodies and gamma interferon were shown not to be involved in the
elimination of virus from the brain.
*
Corresponding author. Mailing address: Institut
für Impfstoffe, Bundesforschungsanstalt für
Viruskrankheiten der Tiere, Paul-Ehrlich-Str. 28, D-72076
Tübingen, Germany. Phone: 49 7071 967 106. Fax: 49 7071 967 105. E-mail: stitz{at}tue.bfav.de
Dedicated to Professor Hermann Becht.

Present address: Paul-Ehrlich-Institut, Langen, Germany.
J Virol, May 1998, p. 4387-4395, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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