红丝线草降压作用的初步探讨

本文重点介绍红丝线草水提取物的降压作用,着重探讨降压作用的血管机制,动物采用SD大白鼠,雄性,体重在200—220克左右。用戊巴比妥钠(50mg/kg)腹腔注射麻醉,在体实验以颈动脉血压为指标,用Narco型四导生理记录仪描记实验结果;离体血管条实验,用大白鼠尾动脉螺旋条,红丝线草水提取物剂量是:1、3、10、30、100mg/kg,其它激动剂和拮抗剂的剂量是:异丙肾上腺素1μg/kg、心得安3.3mg/kg、乙酰胆碱1μg/kg、阿托品1mg/kg、组织胺40μg/kg、Pyrilamine 3.3mg/kg、甲氰咪胍3.3mg/kg、血管紧张素Ⅰ40ng/kg、甲巯丙脯酸(Captopril)20μg/kg/min消炎痛0.4mg/kg/min。不论在体(?)、离体实验均证明红丝线草水提取物有扩张血管作用。以30mg/kg红丝线草水提取物为例,可使大白鼠平均血压下降48±2.77mm Hg,多种阻断剂(H_1、H_2受体阻断剂,β—受体阻断剂,消炎痛)对它无影响(t测验无显著性)。惟阿托品、Captopril可减弱它的降压效应(t测验差异显著),提示它的降压作用机制可能与血管平滑肌的M—受体或与肾素—血管紧张素系统有关。

A PRELIMINARY REPORT OF HYPOTENSIVE ACTION OF HERB HONGSIXIAN (PERISTROPHE ROXBURGHIANA SCHULT BREMEK)

Hongsixian (HSX) is a plant. Peristrophe roxbur- ghiana (Schult) Bremek. It grows in southern China. It long has been used as a traditional remedy for treating cough and hypertension in Guangdong Province, but its anti-hypertensive effect has not been reported. This paper describes the hypotensive action of HSX especially about its vascular mechanism. It shows that HSX has vasodilating action both in vivo and in vitro. A number of blockers do not block its action, but atropine and captopril can decrease its hypotensive, effect. This reminds one that the mechanism of the hypotensive action of HSX is concerned with the M-receptor and the renin-angiotensin system.