再髓鞘化
少突胶质细胞
Notch信号通路
星形胶质增生
生物
神经科学
多发性硬化
脱髓鞘病
赫斯1
室下区
中枢神经系统
祖细胞
神经干细胞
细胞生物学
免疫学
信号转导
髓鞘
干细胞
作者
Patricia Mathieu,María Florencia Almeira Gubiani,Débora Rodríguez,Laura I. Gómez Pinto,María de Luján Calcagno,Ana M. Adamo
标识
DOI:10.1093/toxsci/kfz130
摘要
Multiple sclerosis (MS) is an immune-mediated central nervous system disease mostly affecting young people. Multiple sclerosis 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 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.
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