灯盏花素对异丙肾上腺素引起大鼠心肌肥厚和纤维化的保护作用

目的研究灯盏花素(breviscapine,Bre)对异丙肾上腺素引起大鼠心肌肥厚和纤维化的保护作用及其机制。方法用异丙肾上腺素(isoproterenol,Iso)皮下注射,连续7d,建立大鼠心肌肥厚和纤维化模型。造模d2起给大鼠腹腔注射Bre12.5和25mg·kg-1·d-1,连续用药14d,测量大鼠心脏重量指数(HW/BW)和左心室重量指数(LVW/BW),放射免疫分析法检测左心室心肌组织中血管紧张素Ⅱ(AngⅡ)的变化;分光光度法检测左心室心肌组织中羟脯氨酸、一氧化氮(NO)含量和Na+,K+ATPase,Ca2+ATPase活性。结果Iso模型组大鼠心重指数和左心室重量指数明显增大,左心室心肌组织中AngⅡ和羟脯氨酸含量增高,NO水平下降,Na+,K+ATPase和Ca2+ATPase活力下降,Bre能提高心肌组织中的NO含量,抑制AngⅡ产生,增强Na+,K+ATPase和Ca2+ATPase活力,降低羟脯氨酸含量,抑制胶原的产生。结论Bre对Iso引起大鼠心肌肥厚和纤维化具有一定的改善作用。

Protective effects of breviscapine on myocardial hypertrophy and fibrosis induced by isoproterenol in rats

Aim To investigate the protective effects of breviscapine(Bre) on myocardial hypertrophy and fibrosis induced by isoproterenol (Iso) in rats and its mechanism. Methods Myocardial hypertrophy and fibrosis model of rats were induced by injection of Iso for 7 days(5 mg·kg -1·d -1,sc).From day 2～15,rats were treated with Bre 12.5 and 25 mg·kg -1·d -1 ip,the NS control and Iso model group received saline injection.On day 15,animals were killed by decapitation,monitored in terms of myocardial indexes (heart weight/boday weight, HW/BW and left ventricalar weight/body weight,LVW/BW);the contents of angio- tensin Ⅱ(AngⅡ),nitric oxide(NO) and hydroxyproline and the activity of Na+,K+-ATPase and Ca 2+-ATPase in left ventricle were assayed with radioimmunoassay and spectrophotometry,respectively. Results Compared with the NS control group, the myocardial indexes, the level of AngⅡ and hydroxyproline in left ventricle were markedly increased and NO content, activity of Na+,K+-ATPase and Ca 2+-ATPase in left ventricle were decreased in Iso model group;treatment with Bre 25 mg·kg -1·d -1 significantly reduced the myocardial index and content of AngⅡ and hydroxyproline in left ventricle,increased the NO content ,enhanced the activity of Na+,K+-ATPase and Ca 2+-ATPase.Conclusion Bre can alleviate myocardial hypertrophy and fibrosis induced by Iso in rats.