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Paralysis caused by acute myelitis in Theiler's murine encephalomyelitis virus strain GD VII infection is induced by CD4⁺ lymphocytes infiltrating the spinal cord

¹ Department of Microbiology, Hokkaido University School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo 060
and² Department of Bacteriology, Hirosaki University School of Medicine, Zaifu-Cho 5, Hirosaki 036, Japan

Intravenous infection by Theiler's murine encephalomyelitis virus strain GD VII causes acute encephalomyelitis and paralysis in infected mice. However, nude mice and cyclophosphamide-treated ddY mice did not show paralysis when they were able to survive until day 20 post-infection (p.i.). Of ddY mice infected with 5 x 10⁷ p.f.u./mouse, 70–80% showed symptoms of paralysis on day 20 p.i. The viral titres in the brain and spinal cord in infected mice were not significantly different between paralytic and non-paralytic mice. In all of the mice infected with the virus, CD4⁺ lymphocytes and CD8⁺ lymphocytes had infiltrated the brain on days 10, 12, 14 and 20 p.i. as demonstrated by flow cytometric analysis. In contrast, few T lymphocytes infiltrated the spinal cord in the non-paralytic mice. Administration of an anti-CD4 monoclonal antibody (MAb) or anti-T cell receptor- MAb on day 6 p.i. inhibited paralysis until day 20 p.i., though 20% of the MAb-treated mice and 80% of the control mice showed paralysis. Administration of anti-CD8 MAb was not effective in the suppression of paralysis. The MAb treatment did not significantly augment viral replication in the spinal cord, although the viral titres in the brain of the MAb-treated mice increased significantly. After the transfer of spleen cells from infected C3H mice, the recipient mice infected with a small amount of the virus showed paralysis, though uninfected mice did not. This transfer could be blocked by CD4⁺ lymphocyte depletion of the donor mice. These results indicate that paralysis caused by acute myelitis in Theiler's virus strain GD VII infection is induced by CD4⁺ lymphocytes infiltrating the spinal cord.

^* Author for correspondence. Fax +81 11 706 7866.

Received 21 December 1994; accepted 30 May 1995.

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