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Effect of vitamin C and lipoic acid on streptozotocin-induced diabetes gene expression: mRNA and protein expressions of Cu–Zn SOD and catalase

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Abstract

The involvement of oxidative stress in the pathogenesis of diabetes mellitus has been confirmed by numerous studies. In this study, the expression of two antioxidant enzymes, superoxide dismutase (SOD), and catalase which are involved in the detoxification of reactive oxygen species was studied in the streptozotocin-induced diabetic rat liver tissues. The enzyme assays showed a significant decrease in both enzymes activities compared to control animals. The RT-PCR and Western-blot analysis results demonstrated that this decrease in activity is regulated at the level of gene expression, as both catalase and Cu–Zn SOD mRNA and protein expressions were also suppressed. Supplementing the animals with vitamin C, a powerful antioxidant increased both SOD and catalase activities with no change in both mRNA and protein expressions suggesting a role of post-translational modification. However, even though mRNA expressions of both catalase and Cu–Zn SOD were not changed, the protein levels increased in parallel to activities in the case of another antioxidant, α-lipoic acid. An increase in the rate of translation, without changing the rate of transcription indicates a translational effect of lipoic acid in changing the activities of antioxidant enzymes to prevent the oxidative damage in diabetes.

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Acknowledgments

The financial support provided by grants from Middle East Technical University (BAP-08-11-DPT2002K120510-TB3) and TUBITAK (106T246-TBAG-HD/175) is gratefully acknowledged. We would also like to thank to our lab mates Deniz İrtem and Erdem Sendinc for their helps.

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Authors and Affiliations

  1. Department of Biological Sciences, Middle East Technical University, 06531, Ankara, Turkey

    Gökhan Sadi & Tülin Güray

  2. Department of Biology, Fırat University, 23119, Elazig, Turkey

    Ökkes Yılmaz

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  1. Gökhan Sadi
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  2. Ökkes Yılmaz
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  3. Tülin Güray
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Correspondence to Gökhan Sadi.

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Sadi, G., Yılmaz, Ö. & Güray, T. Effect of vitamin C and lipoic acid on streptozotocin-induced diabetes gene expression: mRNA and protein expressions of Cu–Zn SOD and catalase. Mol Cell Biochem 309, 109–116 (2008). https://doi.org/10.1007/s11010-007-9648-6

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  • DOI: https://doi.org/10.1007/s11010-007-9648-6

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