Localization of glutathione and induction of glutathione synthesis- related proteins in mouse brain by low doses of γ-rays

Shuji Kojima, Osamu Matsuki, Takaharu Nomura, Noriko Shimura, Akiko Kubodera, Kiyonori Yamaoka, Hiroshi Tanooka, Hiro Wakasugi, Yoko Honda, Shuji Honda, Toru Sasaki

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

First, we determined the cerebral localization of reduced glutathione (GSH) in normal mice by means of autoradiography using 99mTc-meso- hexamethyl propylene oxime. A highly specific localization of GSH in the cerebellum and hippocampus was observed. Secondly, we measured the elevation of GSH level in the brain after low-dose γ-irradiation. The cerebral GSH levels increased soon after irradiation with 50 cGy of γ-rays, reaching a maximum at 3 h post-treatment, then remaining significantly higher than that of the non-irradiated control until 12 h and returning to the control level by 24 h. Thirdly, we examined the induction of the activities and the mRNAs of proteins involved in the synthesis and regeneration of GSH in the brain of mice subjected to low-dose γ-ray irradiation. The level of mRNA for γ- glutamylcysteine synthetase was significantly increased at 0.5 h, and remained high until 2 h post-irradiation (50 cGy). The level was transiently lowered to the non-irradiated control level at 3 h and slightly increased again after 6 h post-irradiation. γ-Glutamylcysteine synthetase activity was significantly increased 3 h after irradiation, and remained high up to 24 h post-irradiation. As for glutathione reductase, the mRNA level was increased at 0.5 h, and peaked strongly at 2 h, while the enzyme activity was significantly increased at 6 h after irradiation, and continued to increase up to 24 h. The level of mRNA for thioredoxin, which contributes to GSH biosynthesis by supplying cysteine to the de novo pathway, peaked between 0.5 h and 2 h post-irradiation, and rapidly declined thereafter. The content of thioredoxin showed a transient decrease immediately after irradiation, but was then remarkably elevated, reaching a maximum at 3 h, and thereafter declining sharply. These results indicate that the increase in endogenous GSH in mouse brain soon after low-dose γ-ray irradiation is a consequence of the induction of GSH synthesis-related proteins and occurs via both the de novo synthesis and the regeneration pathways.

Original languageEnglish
Pages (from-to)262-269
Number of pages8
JournalBrain Research
Volume808
Issue number2
DOIs
Publication statusPublished - Oct 19 1998
Externally publishedYes

Keywords

  • Glutathione
  • Low-dose γ-ray
  • Mouse brain
  • mRNA for glutathione reductase

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

Fingerprint Dive into the research topics of 'Localization of glutathione and induction of glutathione synthesis- related proteins in mouse brain by low doses of γ-rays'. Together they form a unique fingerprint.

Cite this