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*
Department of Neurology and Neurosurgery, McGill University, Montréal Neurological Institute, Montréal, Québec, Canada; and
Neuroimmunology Branch, National Institutes of Health, Bethesda, MD 20892
Multiple sclerosis (MS) is considered to be an autoimmune disease that is directed either at myelin or at its cell of origin, the oligodendrocytes (OL). The inflammatory lesions in the central nervous system contain multiple myelin Ag-restricted and nonrestricted cell populations with the potential to mediate tissue injury. Previous studies indicate that it is possible to generate MHC class I-restricted myelin peptide-specific cytotoxic CD8 T cells, and that human adult OLs express MHC class I molecules in vitro. The purpose of this study was to demonstrate that myelin basic protein peptide-specific CD8 T cells could induce OL injury. We generated CD8 T cell lines from six healthy donors and five MS patients, and all cell lines were HLA-A2 positive. The obtained CD8 cell lines induced lysis of HLA-A2- but not HLA-A3-transfected HMy2.C1R cells in the presence of myelin basic protein peptide 110–118. In the absence of exogenous peptide, the CD8 T cell lines were cytotoxic to HLA-A2 but not to non-HLA-A2 OLs. Cytotoxicity was blocked with anti-MHC class I-blocking Ab. These results support the postulate that autoreactive CD8 cytotoxic T cells can contribute to the tissue injury in MS.
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