Abstract
Treatment with cyclosporin A, from the time of virus infection, suppressed inflammation and demyelination in the spinal cord of SJL/J or ASW(H-2 s) mice persistently infected with Theiler's murine encephalomyelitis virus. Demyelination was not decreased if treatment was given after inflammation was established. The decrease was independent of serum titers of immunoglobulin G to purified viral antigen but did correlate with decreased proliferation of T lymphocytes to virus and myelin antigens. Silica quartz dust, a direct toxin of macrophages, suppressed demyelination and inflammation if begun at time of virus infection. No therapeutic effect was seen with inhibitors of plasminogen activators or other neutral proteases found primarily in macrophages.
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