Modulation of calcineurin activity in mouse brain by chronic oral administration of cyclosporine A

Authors

  • Haipeng Liu,

    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
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  • Linghui Tu,

    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
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  • Qianru Wang,

    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
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  • Yue Sun,

    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
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  • Yipeng Ma,

    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
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  • Juren Cen,

    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
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  • Qun Wei,

    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
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  • Jing Luo

    Corresponding author
    1. Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering and Biotechnology Beijing Key Laboratory, Beijing, People's Republic of China
    • Department of Biochemistry and Molecular Biology, Life Science Institute, Beijing Normal University, Beijing 100875, People's Republic of China
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Abstract

Summary

Calcineurin (CN) is an important phosphatase that mediates many physiological and pathological processes. The regulators of calcineurin (RCAN1) and Cu, Zn superoxide dismutase (SOD1) are two endogenous modulators of CN activity. Cyclosporine A (CsA) is a well-known exogenous inhibitor of CN and used as an immunosuppressive drug after transplantation and for the treatment of immune diseases. The degree of CN inhibition by CsA varies among each tissue. The brain accumulates low levels of CsA due to the blood–brain barrier after oral administration. In our study, we investigated RCAN1 and SOD1 expression in long-term CsA-treated mouse brain. Using Western blot, we found that chronic CsA treatment had caused significant up-regulation of RCAN1-1L and RCAN1-4 protein isoforms after 25 days in mouse brain. At the same time, chronic CsA treatment also resulted in decreased expression of SOD1. We simultaneously found more dramatic CN inhibition in mouse brain. It was suspected that the significant reduction of CN activity in vivo resulted partially from up-regulated RCAN1 and down-regulated SOD1 expression. In contrast, CsA treatment in SY5Y cells affected SOD1 expression and CN activity significantly, but had no obvious effects on RCAN1-1 mRNA expression. The changes of RCAN1, SOD1, and CN activity may be part of maladaptive responses, resulting in neuropathological conditions. These data might partially explain CsA neurotoxicity despite the low concentration of CsA in brain. © 2013 IUBMB Life 65(5):445–453, 2013.

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