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                <title level="j">Neuropharmacology</title>
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                <term xml:lang="en"> Oligodendrocyte</term>
                <term xml:lang="en"> Tiron (PubChem CID: 9001)</term>
                <term xml:lang="en"> Paclitaxel (PubChem CID: 36314)</term>
                <term xml:lang="en"> Olesoxime (PubChem CID: 21763506)</term>
                <term xml:lang="en"> Olesoxime</term>
                <term xml:lang="en"> Mitochondria</term>
                <term xml:lang="en"> MitoTEMPO (PubChem CID: 54613387)</term>
                <term xml:lang="en"> Microtubule dynamics</term>
                <term xml:lang="en"> Mdivi-1 (PubChem CID: 3825829)</term>
                <term xml:lang="en">Cell differentiation</term>
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              <p>Multiple sclerosis (MS) is a neurodegenerative disease characterized by episodes of immune attacks and oligodendrocyte death leading to demyelination and progressive functional deficits. New therapeutic strategies are needed to stimulate the spontaneous regenerative process observed in some patients. Spontaneous myelin repair relies on the mobilization and differentiation of endogenous oligodendrocyte progenitors at the lesion site. Olesoxime, a cholesterol-like compound, has been shown to favor oligodendrocyte maturation in culture and promote myelin regeneration in rodents. Here, we study the mode of action of this compound and show that it binds to oligodendrocyte mitochondria, leading to their hyperfilamentation. This is accompanied by a reduction of basal superoxide levels, and accumulation of End Binding Protein 1 (EB1) at growing ends of microtubules. In parallel, we demonstrate that Reactive Oxygen Species (ROS) scavengers also promote oligodendrocyte differentiation, together with increasing mitochondrial filamentation and EB1-dependent microtubule polymerization. Altogether, our data uncover the mechanisms by which olesoxime promotes oligodendrocyte maturation. They also reveal that a bidirectional relationship between mitochondria hyperfilamentation and ROS level modulation controls oligodendrocyte maturation. This study identifies new cellular mechanisms to target for the development of regenerative treatments for MS.</p>
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