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• W1978996683 abstract "Transplantation of oligodendrocyte precursor cells (OPCs) results in efficient remyelination in animal models of demyelination. However, the experiments so far undertaken have not addressed the need for tissue-type matching to achieve graft-mediated remyelination. Examination of MHC expression (main determinant of allograft rejection) by OPCs showed nondetectable levels under standard culture conditions and upregulation of MHC Class I expression only upon exposure to interferon gamma. We therefore hypothesized that MHC matching of OPC grafts may not be crucial to achieve transplant-mediated remyelination. Transplant experiments performed using a nonself repairing toxin-induced demyelination model showed that, similarly to allogeneic neurons, survival of allogeneic oligodendrocyte lineage cells is influenced by donor-host haplotype combination and graft composition. Transplantation of allogeneic mixed glial cell cultures resulted in remyelination failure by 1 month postengraftment due to a rejection response targeting both myelinating oligodendrocytes and OPCs, suggesting that inflammation-induced upregulation of OPC MHC I expression results in susceptibility to cytotoxic T cell attack. In contrast, remyelination persisted for at least 2 months following transplantation of OPC-enriched cultures whose overall MHC expression level was significantly decreased. While OPC-enriched preparations elicited delayed type hypersensitivity responses in hosts sensitized to alloantigens, allografting of such preparations into a central nervous system demyelinating lesion did not result in recipient priming. We conclude that while allografted oligodendrocyte lineage cells become targets of a graft rejection response once this response has been initiated, transplantation of OPC-enriched preparations can evade priming against alloantigens and graft rejection. This finding indicates that close tissue matching may not be an essential requirement for successful transplant-mediated remyelination." @default.
• W1978996683 created "2016-06-24" @default.
• W1978996683 creator A5010500523 @default.
• W1978996683 creator A5029623639 @default.
• W1978996683 date "2006-09-27" @default.
• W1978996683 modified "2023-10-16" @default.
• W1978996683 title "Haplotype matching is not an essential requirement to achieve remyelination of demyelinating CNS lesions" @default.
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• W1978996683 doi "https://doi.org/10.1002/glia.20425" @default.
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