CXCR4 promotes differentiation of oligodendrocyte progenitors and remyelination.
Multiple sclerosis is a neurodegenerative disease characterized by episodes of autoimmune attack of oligodendrocytes leading to demyelination and progressive functional deficits. Because many patients exhibit functional recovery in between demyelinating episodes, understanding mechanisms responsible for repair of damaged myelin is critical for developing therapies that promote remyelination and prevent disease progression. The chemokine CXCL12 is a developmental molecule known to orchestrate the migration, proliferation, and differentiation of neuronal precursor cells within the developing CNS. Although studies suggest a role for CXCL12 in oligodendroglia ontogeny in vitro, no studies have investigated the role of CXCL12 in remyelination in vivo in the adult CNS. Using an experimental murine model of demyelination mediated by the copper chelator cuprizone, we evaluated the expression of CXCL12 and its receptor, CXCR4, within the demyelinating and remyelinating corpus callosum (CC). CXCL12 was significantly up-regulated within activated astrocytes and microglia in the CC during demyelination, as were numbers of CXCR4+NG2+ oligodendrocyte precursor cells (OPCs). Loss of CXCR4 signaling via either pharmacological blockade or in vivo RNA silencing led to decreased OPCs maturation and failure to remyelinate. These data indicate that CXCR4 activation, by promoting the differentiation of OPCs into oligodendrocytes, is critical for remyelination of the injured adult CNS.
Patel
Jigisha R
JR
Department of Internal Medicine, Washington University School of Medicine, St Louis, MO 63110, USA.
McCandless
Erin E
EE
Dorsey
Denise
D
Klein
Robyn S
RS
D053687:Adult Stem Cells / Q000166:cytology* / Q000276:immunology / Q000502:physiology*; D000818:Animals; D001253:Astrocytes / Q000276:immunology / Q000502:physiology; D001483:Base Sequence; D002454:Cell Differentiation / Q000276:immunology / Q000502:physiology; D002614:Chelating Agents / Q000633:toxicity; D054377:Chemokine CXCL12 / Q000276:immunology / Q000502:physiology; D003337:Corpus Callosum / Q000276:immunology / Q000473:pathology; D003471:Cuprizone / Q000633:toxicity; D004195:Disease Models, Animal; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D009103:Multiple Sclerosis / Q000235:genetics / Q000276:immunology / Q000473:pathology / Q000503:physiopathology; D009186:Myelin Sheath / Q000276:immunology / Q000502:physiology*; D009457:Neuroglia / Q000276:immunology / Q000502:physiology; D009836:Oligodendroglia / Q000166:cytology* / Q000276:immunology / Q000502:physiology*; D034622:RNA Interference; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics; D019718:Receptors, CXCR4 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*
C514936:CXCR4 protein, mouse; D002614:Chelating Agents; D054377:Chemokine CXCL12; C515256:Cxcl12 protein, mouse; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D019718:Receptors, CXCR4; D003471:Cuprizone