Academic Thesis

Basic information

Name Katayama Keiichi
Belonging department
Occupation name
researchmap researcher code B000305947
researchmap agency Okayama University of Science

Title

Cell cycle and cell death regulation of neural progenitor cells in the 5-azacytidine (5AzC)-treated developing fetal brain

Bibliography Type

 

Author

M Ueno
K Katayama
H Yamauchi
H Nakayama
K Doi

Summary

In the developing brain, neural progenitor cells are susceptible to many extrinsic stresses, including DNA damage. We treated pregnant rats with 5-azacytidine (5AzC), a DNA demethylating and damaging agent, to investigate the cellular responses of the fetal brain, focusing on the regulation of proliferation and cell death. 5AzC first induced the accumulation of cells in abnormal mitosis, G2-phase accumulation, and then apoptosis of the neural progenitor cells. Most of the apoptotic cells were in G1 phase. Cell cycle transition studies suggested that G2/M progression was blocked, after which the cells moved to G I phase or underwent apoptosis. p53, a key factor for response to DNA damage, and some of its target genes showed increased expression in Western blot and DNA microarray analyses. In 5AzC-treated fetal brains of p53-deficient mice, apoptosis did not occur, although G2/M accumulation was induced. These results suggest that, in the developing brain, apoptosis is p53-dependent but that another mechanism governs the G2/M checkpoint. The G2/M regulator, Cdc:2, was activated by dephosphorylation through G2/M accumulation, suggesting accelerated entry into mitosis leading to accumulation of cells showing abnormal mitosis. Furthermore, some cells may have died due to mitotic catastrophe. Throughout brain development, various cell cycle and cell death regulation mechanisms provide neural progenitor cells with options for defense from DNA damage. (c) 2005 Elsevier Inc. All rights reserved.

Magazine(name)

EXPERIMENTAL NEUROLOGY

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE

Volume

198

Number Of Pages

1

StartingPage

154

EndingPage

166

Date of Issue

2006-03

Referee

Exist

Invited

Not exist

Language

English

Thesis Type

Research papers (academic journals)

ISSN

 

DOI

10.1016/j.expneurol.2005.11.024

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PMID

 

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arXiv ID

 

ORCID Put Code

 

DBLP ID