title: Golli myelin basic proteins stimulate oligodendrocyte progenitor cell proliferation and differentiation in remyelinating adult mouse brain.
abstract: Golli myelin basic proteins are necessary for normal myelination, acting via voltage and store-dependent Ca(2+) entry at multiple steps during oligodendrocyte progenitor cell (OPC) development. To date nothing is known regarding the role of golli proteins in demyelination or remyelination events. Here the effects of golli ablation and overexpression in myelin loss and recovery were examined using the cuprizone (CPZ) model of demyelination/remyelination. We found severe demyelination in the corpus callosum (CC) of golli-overexpressing mice (JOE) during the CPZ treatment, which was accompanied by an increased number of reactive astrocytes and activation of microglia/macrophages. During demyelination of JOE brains, a significant increase in the number of proliferating OPCs was found in the CC as well as in the subventricular zone, and our data indicate that these progenitors matured and fully remyelinated the CC of JOE animals after CPZ withdrawal. In contrast, in the absence of golli (golli-KO mice) delayed myelin loss associated with a smaller immune response, and a lower number of OPCs was found in these mice during the CPZ treatment. Furthermore, incomplete remyelination was observed after CPZ removal in large areas of the CC of golli-KO mice, reflecting irregular recovery of the oligodendrocyte population and subsequent myelin sheath formation. Our findings demonstrate that golli proteins sensitize mature oligodendrocytes to CPZ-induced demyelination, while at the same time stimulate the proliferation/recruitment of OPCs during demyelination, resulting in accelerated remyelination.
authors.affiliation: Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-7332, USA. ppaez@mednet.ucla.edu
authors.forename: Pablo M
authors.initials: PM
authors.lastname: Paez
authors.forename: Veronica T
authors.initials: VT
authors.lastname: Cheli
authors.forename: Cristina A
authors.initials: CA
authors.lastname: Ghiani
authors.forename: Vilma
authors.initials: V
authors.lastname: Spreuer
authors.forename: Vance W
authors.initials: VW
authors.lastname: Handley
authors.forename: Anthony T
authors.initials: AT
authors.lastname: Campagnoni
mesh_terms: D000818:Animals; D001253:Astrocytes / Q000166:cytology / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D002454:Cell Differentiation / Q000502:physiology*; D049109:Cell Proliferation; D003337:Corpus Callosum / Q000166:cytology* / Q000378:metabolism; D003471:Cuprizone; D003711:Demyelinating Diseases / Q000139:chemically induced / Q000378:metabolism; D008264:Macrophages / Q000166:cytology / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D017628:Microglia / Q000166:cytology / Q000378:metabolism; D004676:Myelin Basic Protein / Q000235:genetics / Q000378:metabolism*; D009186:Myelin Sheath / Q000378:metabolism*; D058953:Neural Stem Cells / Q000166:cytology* / Q000378:metabolism; D009836:Oligodendroglia / Q000166:cytology* / Q000378:metabolism
chemical_list: D004676:Myelin Basic Protein; D003471:Cuprizone; D002118:Calcium