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dc.contributor.authorTatomir, A.
dc.contributor.authorRao, G.
dc.contributor.authorBoodhoo, D.
dc.contributor.authorVlaicu, S.I.
dc.contributor.authorBeltrand, A.
dc.contributor.authorAnselmo, F.
dc.contributor.authorRus, V.
dc.contributor.authorRus, H.
dc.date.accessioned2020-05-18T19:43:54Z
dc.date.available2020-05-18T19:43:54Z
dc.date.issued2020
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85083899682&doi=10.3389%2ffimmu.2020.00619&partnerID=40&md5=9496d331526f226656869073dd3f5ca2
dc.identifier.urihttp://hdl.handle.net/10713/12766
dc.description.abstractSublytic levels of C5b-9 increase the survival of oligodendrocytes (OLGs) and induce the cell cycle. We have previously observed that SIRT1 co-localizes with surviving OLGs in multiple sclerosis (MS) plaques, but it is not yet known whether SIRT1 is involved in OLGs survival after exposure to sublytic C5b-9. We have now investigated the role of SIRT1 in OLGs differentiation and the effect of sublytic levels of C5b-9 on SIRT1 and phosphorylated-SIRT1 (Ser27) expression. We also examined the downstream effects of SIRT1 by measuring histone H3 lysine 9 trimethylation (H3K9me3) and the expression of cyclin D1 as a marker of cell cycle activation. OLG progenitor cells (OPCs) purified from the brain of rat pups were differentiated in vitro and treated with sublytic C5b-9 or C5b6. To investigate the signaling pathway activated by C5b-9 and required for SIRT1 expression, we pretreated OLGs with a c-jun antisense oligonucleotide, a phosphoinositide 3-kinase (PI3K) inhibitor (LY294002), and a protein kinase C (PKC) inhibitor (H7). Our data show a significant reduction in phospho-SIRT1 and SIRT1 expression during OPCs differentiation, associated with a decrease in H3K9me3 and a peak of cyclin D1 expression in the first 24 h. Stimulation of OLGs with sublytic C5b-9 resulted in an increase in the expression of SIRT1 and phospho-SIRT1, H3K9me3, cyclin D1 and decreased expression of myelin-specific genes. C5b-9-stimulated SIRT1 expression was significantly reduced after pretreatment with c-jun antisense oligonucleotide, H7 or LY294002. Inhibition of SIRT1 with sirtinol also abolished C5b-9-induced DNA synthesis. Taken together, these data show that induction of SIRT1 expression by C5b-9 is required for cell cycle activation and is mediated through multiple signaling pathways. Copyright 2020 Tatomir, et. al.en_US
dc.description.sponsorshipThis work was supported in part Veterans Administration Merit Award I01BX001458 and RO1 NS42011.en_US
dc.description.urihttps://doi.org/10.3389/fimmu.2020.00619en_US
dc.language.isoen_USen_US
dc.publisherFrontiers Media S.A.en_US
dc.relation.ispartofFrontiers in Immunology
dc.subjectC5b-9en_US
dc.subjectcell cycleen_US
dc.subjectcyclin D1en_US
dc.subjectoligodendrocyteen_US
dc.subjectSIRT1en_US
dc.titleHistone Deacetylase SIRT1 Mediates C5b-9-Induced Cell Cycle in Oligodendrocytesen_US
dc.typeArticleen_US
dc.identifier.doi10.3389/fimmu.2020.00619
dc.identifier.pmid32328069


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