Academic Thesis

Basic information

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

Title

Repair process of fetal brain after 5-azacytidine-induced damage

Bibliography Type

 

Author

Masaki Ueno
Kei-ichi Katayama
Hirofumi Yamauchi
Akira Yasoshima
Hiroyuki Nakayama
Kunio Doi

Summary

The fetal brain is susceptible to many extrinsic stresses. Some of these stresses induce excessive cell death in the prenatal stage, leading to anomalies in the neonatal brain. However, it is unclear how the developing brain responds to and repairs the prenatal tissue damage. We treated pregnant rats on day 13 of gestation with 5-azacytidine, one of the compounds that induces excessive cell death and inhibits proliferation in neural progenitor cells, to damage the fetal brain, and investigated the repair process up to 60 h after treatment. Histological analysis showed that 5-azacytidine induced strong apoptosis of neural cells. By 60 h, apoptotic cells disappeared and the tissue was repaired, although the telencephalic wall remained thinner than in controls. Flow cytometry analysis showed that the cell cycle distribution also returned to control levels at 60 h, suggesting that the repair process was completed around 60 h. During the repair period, amoeboid microglia infiltrated the brain and ingested the apoptotic cells. These microglial cells were positive for the multiple microglial markers, and mRNAs for the microglia-related cytokines tumor necrosis factor alpha, interleukin 1 beta and macrophage colony stimulating factor (M-CSF) were up-regulated. DNA microarray analysis showed the up-regulation of genes relevant to glial cells, inflammation, the extracellular matrix, glycolysis, proliferation and neural development. We show here that the developing brain has the capacity to respond to the damage induced by extrinsic chemical stresses, including changing the expression of numerous genes and the induction of microglia to aid the repair process.

Magazine(name)

EUROPEAN JOURNAL OF NEUROSCIENCE

Publisher

BLACKWELL PUBLISHING

Volume

24

Number Of Pages

10

StartingPage

2758

EndingPage

2768

Date of Issue

2006-11

Referee

Exist

Invited

Not exist

Language

English

Thesis Type

Research papers (academic journals)

ISSN

 

DOI

10.1111/j.1460-9568.2006.05161.x

NAID

 

PMID

 

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arXiv ID

 

ORCID Put Code

 

DBLP ID