豚鼠呼吸器官离体平滑肌组织的药效学特点

Pharmacodynamic characteristics of isolated smooth muscles from guinea pig respiratory organs

豚鼠离体气管和支气管对氨甲酰胆碱（ＣＣｈ）、异丙肾上腺素（Ｉｓｏ）、抗原（ＯＡ）和ＫＣｌ的反应较强；但对硝普钠（ＮＰＳ）反应较弱，缺乏α－受体反应。肺动脉条对苯肾上腺素和ＮＰＳ的反应强；但对ＫＣｌ的亲和力较低，Ｉｓｏ作用较弱，对ＣＣｈ、辣椒素（Ｃａｐ）、ＯＡ无明显反应。肺条兼有气道及肺血管平滑肌的特点，对ＣＣｈ的亲和力较弱，对Ｉｓｏ和ＮＰＳ的亲和力较强；对Ｃａｐ表现舒张或收缩反应。Ｐ＜０．０１；与肺动脉条比较：＋Ｐ＜０．０５，＋＋Ｐ＜０．０１１材料和方法１．１材料实验用成年Ｈａｒｔｌｅｙ豚鼠（３５０～４５０ｇ，♂♀兼用），由浙江医科大学实验动物中心提供。实验试剂如下：组胺（Ｈｉｓ）、氨甲酰胆碱（ＣＣｈ）、辣椒素（Ｃａｐ）、硝普钠（ＮＰＳ）、普萘洛尔和卵白蛋白（ＯＡ，ＧｒａｄｅＶ）：Ｓｉｇｍａ公司；苯肾上腺素（ＰｈＥ）：上海天丰药厂；异丙肾上腺素（Ｉｓｏ）：上海信谊制药厂，氯化钾（ＫＣｌ，ＡＲ）：上海振兴试剂厂；阿托品：杭州民生药厂；扑尔敏：上海延安制药厂；酚妥拉明（Ｒｉｇｉｔｉｎｅ）：Ｃｉｂａ公司．１．２方法动物以木槌击昏后股动脉放血，取出气管及肺，以Ｋｒｅｂｓ液经肺动脉轻轻冲洗肺组织，分离气管、支气管、肺?

The isolated tracheal and bronchial smooth muscles of guinea Pigs were more sensitive to carbachol(CCh),antigen(OA)and potassium chloride (KCl),but the response to nitroprusside sodium(NPS)was weaker,and failed to respond to phenylephrine(PhE).In contrast,in pulmonary arterial strips,PhE and NPS were more effective,the affinity to KCl and the relaxation to isoprenaline(Iso)were smaller,and no significant response to CCh,capsaicin(Cap)or OA was observed.The lung parenchymal strips possesssed both the properties of airway and pulmonary arterial smooth muscles,with weaker affinity to CCh and higher affinities to Iso and NPS,but it was either contracted or relaxed by Cap.