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Diazepam binding inhibitor (DBI) gene expression in the brains of socially isolated and group-housed mice.

Abstract：

:Diazepam binding inhibitor (DBI), a putative endogenous polypeptide ligand for benzodiazepine (BZD) receptors, has been shown to act as an inverse BZD receptor agonist in the brain. We previously suggested that the social isolation stress-induced decrease in pentobarbital sleeping time in mice was partly due to an increase in the activity of endogenous substances with an inverse BZD receptor agonist-like property such as DBI. In this study, we examined whether the DBI gene expression is affected by socially isolated stress. Consistent with the previous findings, the in situ hybridization result showed very strong signals of DBI mRNA around the regions of the third ventricle, especially the lining cells, the arcuate nucleus of the hypothalamus and the cerebellum, in both socially isolated and group-housed animals. Unexpectedly, however, semi-quantitative experiments with reverse transcription polymerase chain reaction technique revealed that socially isolated mice had significantly less expression of DBI mRNA in the hypothalamus than group-housed animals, and no difference in the expression in the other brain areas was observed between two animal groups. We discuss the relationship between the decrease of DBI mRNA expression in the hypothalamus and the decrease of GABA(A) receptor function following long-term social isolation in mice.

journal_name

Neurosci Res

journal_title

Neuroscience research

authors

Dong E,Matsumoto K,Tohda M,Kaneko Y,Watanabe H

doi

10.1016/s0168-0102(99)00010-3

subject

Has Abstract

pub_date

1999-03-01 00:00:00

pages

171-7

issue

3

eissn

0168-0102

issn

1872-8111

pii

S0168-0102(99)00010-3

journal_volume

33

pub_type

杂志文章

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