Analysis of the inhibitory effect of gypenoside on Na(+), K (+)-ATPase in rats' heart and brain and its kinetics / 中国结合医学杂志
Chinese journal of integrative medicine
;
(12): 128-131, 2007.
Article
in English
| WPRIM
| ID: wpr-282427
ABSTRACT
<p><b>OBJECTIVE</b>To study the effects of gypenoside (Gyp) on the activity of microsomal Na(+), K(+)-ATPase in rat's heart and brain in vitro.</p><p><b>METHODS</b>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.</p><p><b>RESULTS</b>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(+).</p><p><b>CONCLUSION</b>Gyp displays its cardiotonic and central inhibitory effects by way of inhibiting heart and brain's microsomal Na(+), K(+)-ATPase activities in rats.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pharmacology
/
Brain
/
Plant Extracts
/
Kinetics
/
Adenosine Triphosphate
/
Rats, Wistar
/
Sodium-Potassium-Exchanging ATPase
/
Gynostemma
/
Enzyme Inhibitors
/
Myocardium
Limits:
Animals
Language:
English
Journal:
Chinese journal of integrative medicine
Year:
2007
Type:
Article
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