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Expression of calcium-binding protein regucalcin and microsomal Ca2+-ATPase regulation in rat brain: Attenuation with increasing age

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Abstract

The expression of calcium-binding protein regucalcin and its effect on the microsomal Ca2+-ATPase activity in rat brain tissues was investigated. The expression of regucalcin mRNA was demonstrated by reverse transcription-polymerase chain reaction (RT-PCR) analysis in brain tissues using rat regucalcin-specific primers. Regucalcin concentration in the brain tissues was about 5 × 10-9 M as measured using enzyme-linked immunoadsorbent assay (ELISA), and this level was lowered with increasing age (50 weeks old). The presence of regucalcin (10-9 to 10-7 M) in the enzyme reaction mixture caused a significant decrease in Ca2+-ATPase activity in the brain microsomes of young rats (5 weeks old). Meanwhile, the enzyme activity was not significantly altered by the addition of calmodulin (1 or 50 μg/ml), calbindin (1 or 10 μg/ml), and S-100 A protein (5 or 25 μg/ml), which are other Ca2+-binding proteins in rat brain. The effect of regucalcin to inhibit microsomal Ca2+-ATPase activity was weakened in the brain of rats with increasing age (50 weeks old). The present study demonstrates that regucalcin is expressed in the brain, and that it can uniquely inhibit Ca2+-ATPase activity in the brain microsomes of rats. The findings suggest that regucalcin plays a role in the regulation of microsomal Ca2+-ATPase activity in rat brain tissues.

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Authors and Affiliations

  1. Laboratory of Endocrinology and Molecular Metabolism, Graduate School of Nutritional Sciences, University of Shizuoka, 52-1 Yada, Shizuoka City, 422, Japan

    Masayoshi Yamaguchi, Yasuko Hanahisa & Tomiyasu Murata

  2. Department of Clinical Research, Eli Lilly Japan K.K., 1-1-1 Minamiaoyama, Minato-ku, Tokyo, 107, Japan

    Yasuko Hanahisa

Authors
  1. Masayoshi Yamaguchi
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  2. Yasuko Hanahisa
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  3. Tomiyasu Murata
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Yamaguchi, M., Hanahisa, Y. & Murata, T. Expression of calcium-binding protein regucalcin and microsomal Ca2+-ATPase regulation in rat brain: Attenuation with increasing age. Mol Cell Biochem 200, 43–49 (1999). https://doi.org/10.1023/A:1006928402184

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