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Activation of de novo GSH synthesis pathway in mouse spleen after long term low-dose γ-ray irradiation.
MedLine Citation:
PMID:  23136969     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract Glutathione (GSH) is an important cellular antioxidant and has a critical role in maintaining the balance of cellular redox. In this study, we investigated the GSH biosynthesis genes involved in the elevation of endogenous GSH levels using an irradiation system with an irradiation dose rate of 1.78 mGy/h, which was about 40,000 times less than dose rates used in other studies. The results showed that GSH levels were significantly increased in the low dose (0.02 and 0.2 Gy) irradiated-group compared to the non-irradiated group, but enzymatic antioxidants such as superoxide dismutase and catalase were not induced at any doses tested. The elevation in GSH was accompanied by elevated expression of glutamate-cysteine ligase modifier subunit, but no changes were observed in the expression of glutamate-cysteine ligase catalytic subunit and thioredoxin in de novo GSH synthesis. In the case of genes involved in the GSH regeneration cycle, the expression of glutathione reductase was not changed after irradiation, whereas glutathione peroxidase was only increased in the 0.2 Gy irradiated group. Collectively, our results suggest that the de novo pathway, rather than the regeneration cycle may be mainly switched on in response to stimulation with long term low-dose radiation in the spleen.
Authors:
Eun Kyeong Lee; Jin-Ah Kim; Joong-Sun Kim; Seong Joon Park; Kyu Heo; Kwang Mo Yang; Tae Gen Son
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-9
Journal Detail:
Title:  Free radical research     Volume:  -     ISSN:  1029-2470     ISO Abbreviation:  Free Radic. Res.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9423872     Medline TA:  Free Radic Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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