대한한의학회지 (The Journal of Korean Medicine)

  • 제17권2호
  • /
  • Pages.264-276
  • /
  • 1996
  • /
  • 1010-0695(pISSN)
  • /
  • 2288-3339(eISSN)
대한한의학회 (The Society of Korean Medicine)
권호 표지

삼화산(三和散)이 심장(心臟) Na-K-ATPase 활성(活性)에 미치는 영향(影響)

Effect of Samhwasan on Na-K-ATPase Activity in Microsomal Fraction of Rabbit Heart Ventricles

  • 신현철 (동국대학교 한의과대학 내과학교실) ;
  • 윤철호 (동국대학교 한의과대학 내과학교실) ;
  • 정지천 (동국대학교 한의과대학 내과학교실)
  • 발행 : 1996.10.30
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초록

This study was carried out to evaluate the effect of Samhwasan on the Na-K-ATPase activity of heart muscle. The Na-K-ATPase activity was prepared from rabbit heart ventricles. Samhwasan markedly inhibited the Na- K - ATPase activity in a dose-dependent manner with an estimated $I_{50}$ of 0.56%. Hill coefficient was 1.70, indicating that the enzyme has more than one binding site for the Samhwasan. Inhibition of enzyme activity by Samhwasan increased as pretreatment time was prolonged. Inhibition by the drug was not affected by a change in enzyme protein concentration. Kinetic studies of substrate activation of the enzyme indicated classical noncompetitive inhibition, showing significant reduction in Vmax without a change in Km value. Inhibitory effect by Samhwasan was not altered by changes in concentration of $Mg^{2+}$, $Na^+$ or $K^+$, dithiothreitol. a sulfhydryl reducing reagent, did not protect the inhibition of Na-K-ATPase activity by Samhwasan combination of Samhwasan and ouabain showed a cumulative inhibition fashion. These results suggest that Samhwasan inhibits Na-K-ATPase activity of heart ventricles with an unique binding site different from that of ATP, $Mg^{2+}$, $Na^+$ or $K^+$ and ouabain.

키워드

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