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Protective effects of selenocystine against γ-radiation-induced genotoxicity in Swiss albino mice

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Abstract

Selenocystine (CysSeSeCys), a diselenide aminoacid exhibiting glutathione peroxidase-like activity and selective antitumor effects, was examined for in vivo antigenotoxic and antioxidant activity in Swiss albino mice after exposure to a sublethal dose (5 Gy) of γ-radiation. For this, CysSeSeCys was administered intraperitoneally (i.p.) to mice at a dosage of 0.5 mg/kg body weight for 5 consecutive days prior to whole-body γ-irradiation. When examined in the hepatic tissue, CysSeSeCys administration reduced the DNA damage at 30 min after radiation exposure by increasing the rate of DNA repair. Since antigenotoxic agents could alter the expression of genes involved in cell cycle arrest and DNA repair, the transcriptional changes in p53, p21 and GADD45α were monitored in the hepatic tissue by real-time PCR. The results show that CysSeSeCys alone causes moderate induction of these three genes. However, CysSeSeCys pretreatment resulted in a suppression of radiation-induced enhancement of p21 and GADD45α expression, but did not affect p53 expression. Further analysis of radiation-induced oxidative stress markers in the same tissue indicated that CysSeSeCys significantly inhibits lipid peroxidation and prevents the depletion of antioxidant enzymes and glutathione (GSH) levels. Additionally, it also prevents radiation-induced DNA damage in other radiation sensitive cellular systems like peripheral leukocytes and bone marrow, which was evident by a decrease in comet parameters and micronucleated polychromatic erythrocytes (mn-PCEs) frequency, respectively. Based on these observations, it is concluded that CysSeSeCys exhibits antigenotoxic effects, reduces radiation-induced oxidative stress, and is a promising candidate for future exploration as a radioprotector.

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Acknowledgments

The authors are thankful to Drs. K. B. Sainis, T. Mukherjee, and S. K. Sarkar, for their encouragement and support to this work. HB thanks Indian Academy of Sciences for a summer research fellowship (2008).

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Authors and Affiliations

  1. Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India

    Amit Kunwar, P. P. Bag, H. Bhatt & K. I. Priyadarsini

  2. Radiation Biology & Health Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India

    S. Jayakumar, H. N. Bhilwade & R. C. Chaubey

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  1. Amit Kunwar
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Correspondence to Amit Kunwar.

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Kunwar, A., Jayakumar, S., Bhilwade, H.N. et al. Protective effects of selenocystine against γ-radiation-induced genotoxicity in Swiss albino mice. Radiat Environ Biophys 50, 271–280 (2011). https://doi.org/10.1007/s00411-011-0352-2

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