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Baer, A.; Syed, Y.; Kang, S.; Mitteregger, D.; Vig, R.; ffrench-Constant, C.; Franklin, R.; Altmann, F.; Lubec, G.; Kotter, M. (2009)
Publisher: Oxford University Press
Languages: English
Types: Article
Subjects: /dk/atira/pure/subjectarea/asjc/2700/2728, differentiation, multiple sclerosis, Original Articles, oligodendrocyte, intracellular signalling, myelin inhibitors, Clinical Neurology, adult stem/precursor cells, remyelination

Classified by OpenAIRE into

mesheuropmc: nervous system
Failure of oligodendrocyte precursor cell (OPC) differentiation contributes significantly to failed myelin sheath regeneration\ud (remyelination) in chronic demyelinating diseases. Although the reasons for this failure are not completely understood, several\ud lines of evidence point to factors present following demyelination that specifically inhibit differentiation of cells capable of\ud generating remyelinating oligodendrocytes. We have previously demonstrated that myelin debris generated by demyelination\ud inhibits remyelination by inhibiting OPC differentiation and that the inhibitory effects are associated with myelin proteins. In the\ud present study, we narrow down the spectrum of potential protein candidates by proteomic analysis of inhibitory protein fractions\ud prepared by CM and HighQ column chromatography followed by BN/SDS/SDS–PAGE gel separation using Nano-HPLC-ESIQ-TOF\ud mass spectrometry. We show that the inhibitory effects on OPC differentiation mediated by myelin are regulated by\ud Fyn-RhoA-ROCK signalling as well as by modulation of protein kinase C (PKC) signalling. We demonstrate that pharmacological\ud or siRNA-mediated inhibition of RhoA-ROCK-II and/or PKC signalling can induce OPC differentiation in the presence of myelin.\ud Our results, which provide a mechanistic link between myelin, a mediator of OPC differentiation inhibition associated\ud with demyelinating pathologies and specific signalling pathways amenable to pharmacological manipulation, are therefore of\ud significant potential value for future strategies aimed at enhancing CNS remyelination.
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