远志皂苷H对离体平滑肌与心脏的作用

 目的:研究一种新的远志皂苷H对平滑肌和心肌的药理作用及其机制。方法:制备离体兔回肠,胸主动脉条,Langen-dorf心脏,豚鼠气管条和动情期未孕大鼠子宫标本,记录给药3min后的张力变化。结果:H对上述4种平滑肌均具兴奋作用,19和76μmol·L^-1分别使其张力提高64%和167%,30%和118%,20%和50%,以及100%和180%;对心脏则呈依剂量的抑制作用,19,38和76μmol·L^-1分别使心肌收缩力降低20%,23%和34%,使心率减少17%,20%和35%,但不影响冠脉流量。H对子宫的兴奋作用不受苯海拉明影响,但可被吲哚美辛部分抑制。结论:H对平滑肌具兴奋作用,对心肌具抑制作用,其中对子宫的作用可能部分地与前列腺素合成酶有关。

Effects of saponin H isolated form Polygala tenuifolia Willd on isolated smooth muscle and heart

OBJECTIVE:To study the pharmacological effects of saponin H,a new saponin isolated from Polygala tenuifolia Willd,on isolated smooth muscle and herat.METHODS:Isolated rabbit ileum,aorta strip,Langendorff heart,guinea pig trachea,and rat uterus were prepared.Their changes in tension 3 min after administration of H were recorded.RESULTS:19 and 76 μmol.L-1of H showed contracting on above-mentioned smooth muscles,with increasing their tensions by 64% and 167%,30% and 118%,20% and 50%,100% and 118%,respectively.19,38 and 76μmol.L-1 of H showed dose-dependent inhibition on heart,decreased contractile force by 20%,23% and 34%,and reduced the heart rate by 17%,20% and 35%,respectively,but failed to affect the coronary flow.The contracting action of H on uterus was not influnced by diphenhydramine,but partly attenuated by indomethacin.CONCLUSION:H excited the isolated smooth muscles but inhibited the heart.Its action on uterus was partly related to the activation of prostaglandin synthetase.