+/K+-ATPase均有抑制作用,其IC50分別為(1.58±0.27)×10?6和(1.41±0.16)×10?7 mol/L,在受試劑量下(10?8~10?5 mol/L)對Ca2+/Mg2+-ATPase活性無明顯抑制作用;免疫組化研究表明,ASId 0.5、1.0 mg/kg可顯著降低CaN表達,與模型對照組比較,其表達分別下降73.1%(P<0.01)、78.0%(P<0.001),提示ASId抗心肌肥厚機制與抑制心肌肥厚信號轉(zhuǎn)導(dǎo)通路的重要關(guān)鍵因子CaN有關(guān)。結(jié)論 ASId治療心衰機制與Na+/K+-ATPase抑制產(chǎn)生的即刻心肌收縮效應(yīng),以及抗心肌肥厚的遠期效應(yīng)有關(guān)。;Objective To study the mechanisms of astragaloside IV derivative (ASId) used in the treatment of the chronic heart failure. Methods The myocardial cell membrane was extracted from rats and dogs and the enzyme activity was detected. The calcineurin phosphatase (calcineurin, CaN) expression of signal transduction pathways of myocardial hypertrophy in left ventricle from myocardial infarction rats was also detected by immunohistochemistry. Results The Na+/K+-ATPase activity from both rats and dogs were inhibited except for Ca2+/Mg2+-ATPase activity at the dose of 10?8-10?5 mol/L. The IC50 values were (1.58 ± 0.27) × 10?6 and (1.41 ± 0.16) × 10?7 mol/L, respectively. ASId (0.5 and 1.0 mg/kg) could significantly decrease CaN expression by 73.1% (P < 0.01) and 78.0% (P < 0.001) compared with the control group, which could indicate that the role of ASId on myocardial hypertrophy may be related with CaN, and the key factor of signal transduction pathways of myocardial hypertrophy. Conclusion The mechanism of ASId on heart failure is concerned with the immediate myocardial contraction by inhibiting Na+/K+-ATPase, as well as the long-term effects by relieving myocardial hypertrophy."/> +/K+-ATPase;Ca2+/Mg2+-ATPase;CaN;心肌肥厚;astragaloside IV derivative (ASId); heart failure; Na+/K+-ATPase; Ca2+/Mg2+-ATPase; CaN; myocardial hypertrophy"/>