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Activatory effect of regucalcin on hepatic plasma membrane (Ca2+-Mg2+)-ATPase is impaired by liver injury with carbon tetrachloride administration in rats

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Abstract

The alteration of the plasma membrane (Ca2+-Mg2+)-ATPase activity in the liver of rats administered orally carbon tetrachloride (CCl4) solution was investigated. Rats received a single oral administration of CCl4 (10, 25 and 50%, 1.0 ml/100 g body weight), and 3 or 24 h later they were sacrificed. CCl4 administration caused a remarkable elevation of liver calcium content and a corresponding increase in liver plasma membrane (Ca2+-Mg2+)-ATPase activity, indicating that the increased Ca2+ pump activity is partly involved in calcium accumulation in liver cells. Moreover, the participation in regucalcin, which is an intracellular activating factor on the enzyme, was examined by using anti-regucalcin IgG. The plasma membrane (Ca2+-Mg2+)-ATPase activity increased by CCl4 administration was not entirely inhibited by the presence of anti-regucalcin IgG (1.0 and 2.5 ug/ml) in the enzyme reaction mixture. However, the effect of regucalcin (0.25–1.0 uM) to activate (Ca2+-Mg2+)-ATPase in the liver plasma membranes of normal rats was not revealed in the liver plasma membranes obtained from CCl4-administered rats. Also, the effect of regucalcin was not seen when the plasma membranes were washed with 1.0 mM EGTA, indicating that the disappearance of regucalcin effect is not dependent on calcium binding to the plasma membranes due to liver calcium accumulation. Now, the presence of dithiothreitol (5 mM) or heparin (20 ug/ml) caused a remarkable elevation of the plasma membrane (Ca2+-Mg2+)-ATPase activity in the liver obtained from CCl4-administered rats. Thus, the regucalcin effect differed from that of dithiothreitol or heparin. The present study suggests that the impairment of regucalcin effect on Ca2+ pump activity in liver plasma membranes is partly contribute to hepatic calcium accumulation induced by liver injury with CCl4 administration.

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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, 422, Shizuoka City, Japan

    Hiroko Takahashi & Masayoshi Yamaguchi

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

    Masayoshi Yamaguchi

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  1. Hiroko Takahashi
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  2. Masayoshi Yamaguchi
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Takahashi, H., Yamaguchi, M. Activatory effect of regucalcin on hepatic plasma membrane (Ca2+-Mg2+)-ATPase is impaired by liver injury with carbon tetrachloride administration in rats. Mol Cell Biochem 158, 9–16 (1996). https://doi.org/10.1007/BF00225877

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  • DOI: https://doi.org/10.1007/BF00225877

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