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From the * Division of Virology, One hypothesis for the etiology of central nervous system (CNS) autoimmune disease is that
infection by a virus sharing antigenic epitopes with CNS antigens (molecular mimicry) elicits a
virus-specific immune response that also recognizes self-epitopes. To address this hypothesis,
transgenic mice were generated that express the nucleoprotein or glycoprotein of lymphocytic
choriomeningitis virus (LCMV) as self in oligodendrocytes. Intraperitoneal infection with
LCMV strain Armstrong led to infection of tissues in the periphery but not the CNS, and the
virus was cleared within 7-14 d. After clearance, a chronic inflammation of the CNS resulted, accompanied by upregulation of CNS expression of MHC class I and II molecules. A second
LCMV infection led to enhanced CNS pathology, characterized by loss of myelin and clinical
motor dysfunction. Disease enhancement also occurred after a second infection with unrelated
viruses that cross-activated LCMV-specific memory T cells. These findings indicate that
chronic CNS autoimmune disease may be induced by infection with a virus sharing epitopes
with a protein expressed in oligodendrocytes and this disease may be enhanced by a second infection with the same or an unrelated virus. These results may explain the association of several
different viruses with some human autoimmune diseases.
Department of Immunology,
The Scripps Research Institute, La Jolla, California 92037
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