Cyclin-dependent Kinase Inhibitor Flavopiridol Promotes Remyelination in a Cuprizone Induced Demyelination Model

Overview

Journal Cell Cycle

Specialty Cell Biology

Date 2016 Sep 1

PMID 27580304

Citations 5

Authors

Guiyun Mi

Yunyun Gao

Shuai Liu

Enmao Ye

Yanyan Li

Xiao Jin

Hongju Yang

Zheng Yang

Affiliations

Soon will be listed here.

Abstract

The cuprizone (CPZ) model has been widely used for the studies of de-and remyelination. The CPZ-exposed mice show oligodendrocyte precursor cells (OPCs) increase and mature oligodendrocytes decrease, suggesting an imbalance between proliferation and differentiation of OPCs. In the first experiment of this study, we examined the expression of cell cycle related genes in brains of mice following CPZ administration for 5 weeks by means of microarray assay. In addition, we performed a double labeling of BrdU and Ki-67 to calculate cell cycle exit index in the mice. Our results showed that CPZ administration up-regulated the expression of 16 cell cycle related genes, but down-regulated the expression of only one in the prefrontal cortex (PFC) of mice compared to control group. The treatment inhibited potential precursor cells exit from cell cycle. In the second experiment, we evaluated effects of a CDK inhibitor flavopiridol (FLA) on CPZ-induced neuropathological changes and spatial working memory impairment in mice.FLA treatment for one week effectively attenuated the CPZ-induced increases in NG2 positive cells, microglia and astrocytes, alleviated the concurrent mature oligodendrocyte loss and myelin breakdown, and improved spatial working memory deficit in the CPZ-exposed mice. These results suggest that CPZ-induced neuropathological changes involve in dysregulation of cell cycle related genes. The therapeutic effects of FLA on CPZ-exposed mice may be related to its ability of cell cycle inhibition.

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