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  • Title: Analysis of the inhibitory effect of gypenoside on Na(+), K (+)-ATPase in rats' heart and brain and its kinetics.
    Author: Han XY, Wei HB, Zhang FC.
    Journal: Chin J Integr Med; 2007 Jun; 13(2):128-31. PubMed ID: 17609912.
    Abstract:
    OBJECTIVE: To study the effects of gypenoside (Gyp) on the activity of microsomal Na(+), K(+)-ATPase in rat's heart and brain in vitro. METHODS: The microsomal Na(+), K(+)-ATPase was prepared from rat's heart and brain by differential centrifugation. The activity of microsomal Na(+), K(+)-ATPase was assayed by colorimetric technique. Enzyme kinetic analysis method was used to analyze the effect of Gyp on the microsomal Na(+), K(+)-ATPase of rats. RESULTS: Gyp reversibly inhibited the brain and heart's microsomal Na(+), K(+)-ATPase in a concentration-dependent manner, and showed a more potent effect on enzyme in the brain. The IC(50) of Gyp for the heart and brain were 58.79+/-8.05 mg/L and 52.07+/-6.25 mg/L, respectively. The inhibition was enhanced by lowering the Na(+), or K(+) concentrations or increasing the ATP concentration. Enzyme kinetic studies indicated that the inhibitory effect of Gyp on the enzyme is like that of competitive antagonist of Na(+), the counter-competitive inhibitor for the substrate ATP, and the mixed-type inhibitor for K(+). CONCLUSION: Gyp displays its cardiotonic and central inhibitory effects by way of inhibiting heart and brain's microsomal Na(+), K(+)-ATPase activities in rats.
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