Demyelination-Remyelination in the Central Nervous System: Ligand-Dependent Participation of the Notch Signaling Pathway.

Demyelination-Remyelination in the Central Nervous System: Ligand-Dependent Participation of the Notch Signaling Pathway.

Publication date: Jun 06, 2019

Multiple sclerosis (MS) is an immune-mediated CNS disease mostly affecting young people. MS and other neurodegenerative and white matter disorders involve oligodendrocyte (OL) damage and demyelination. Therefore, elucidating the signaling pathways involved in the remyelination process through the maturation of OL progenitor cells (OPCs) may contribute to the development of new therapeutic approaches. In this context, this paper further characterizes toxic cuprizone (CPZ)-induced demyelination and spontaneous remyelination in rats and investigates the role of ligand-dependent Notch signaling activation along demyelination/remyelination both in vivo and in vitro. Toxic treatment generated an inflammatory response characterized by both microgliosis and astrogliosis. Interestingly, early demyelination revealed an increase in the proportion of Jagged1+/GFAP+ cells, which correlated with an increase in Jagged1 transcript and concomitant Jagged1-driven Notch signaling activation, particularly in NG2+ OPCs, in both the corpus callosum (CC) and subventricular zone (SVZ). The onset of remyelination then exhibited an increase in the proportion of F3/contactin+/NG2+ cells, which correlated with an increase in F3/contactin transcript during ongoing remyelination in the CC. Moreover, neurosphere cultures revealed that neural progenitor cells (NPCs) present in the brain SVZ of CPZ-treated rats recapitulate in vitro the mechanisms underlying the response to toxic injury observed in vivo, compensating for mature OL loss. Altogether, the present results offer strong evidence of cell-type and ligand-specific Notch signaling activation and its time- and area-dependent participation in toxic demyelination and spontaneous remyelination.

Mathieu, P.A., Almeira Gubiani, M.F., Rodr’iguez, D., G’omez Pinto, L.I., Calcagno, M.L., and Adamo, A.M. Demyelination-Remyelination in the Central Nervous System: Ligand-Dependent Participation of the Notch Signaling Pathway. 18268. 2019 Toxicol Sci.

Concepts Keywords
Astrogliosis Demyelination
Brain Inflammatory
Cell Type Toxic injury
Central Nervous System MS
Corpus Callosum Interestingly early demyelination
Demyelination Branches of biology
GFAP Glial cells
Ligand Developmental neuroscience
Multiple Sclerosis Signal transduction
Neurodegenerative Neurology
Notch Remyelination
Notch Signaling Notch signaling pathway
NPCs JAG1
OL Gliosis
Oligodendrocyte Cell signaling
Subventricular Zone Subventricular zone
Vivo Neurosphere
White Matter

Semantics

Type Source Name
pathway BSID Notch signaling
gene UNIPROT CPZ
drug DRUGBANK Chlorpromazine
disease MESH development
gene UNIPROT MAGEE1
disease MESH CNS disease
disease DOID Multiple sclerosis
disease MESH Multiple sclerosis
pathway BSID Notch Signaling Pathway
disease MESH Demyelination

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