摘要
目的探讨麝香保心丸对自发性高血压大鼠(SHR)心肌纤维化的作用及其可能的机制。方法将12周龄SHR大鼠分为麝香保心丸治疗组、苯那普利阳性药物对照组及高血压模型对照组,研究麝香保心丸对治疗12周后的SHR大鼠收缩压(SBP)、左室重量(LVM )、左室重量指数(LVMI)、左室心肌胶原含量及细胞外基质纤连蛋白(fibronectin ,FN)、层粘连蛋白(laminin ,LN)、心脏成纤维细胞(cardiacfibroblast,cFb)和转化生长因子- β1(TGF β1)表达的影响。结果麝香保心丸对SHR无明显降压作用,但与苯那普利一样可降低LVM、LVMI、心肌胶原含量(P <0 .0 5 )。麝香保心丸可明显降低心肌LN、FN含量、心脏成纤维细胞数目和转化生长因子 -β1(TGF -β1)的表达(P <0 . 0 5 )。结论麝香保心丸具有独立降压以外的防治SHR心肌纤维化作用,其机制可能与减少心肌TGF- β1表达和心脏成纤维细胞数目,减少心肌胶原合成及细胞外基质沉积等因素有关。
ObjectiveTo investigate the effects and mechanisms of Shexiang Baoxin Pill (SBP) on myocardial fibrosis in spontaneous hypertensive rats (SHR). MethodsSHR of 12 weeks old were divided into the SBP group, the control group (treated with benazepril) and the model control group. The effects on such indexes as systolic blood pressure (SBP), left ventricular mass (LVM), left ventricular mass index (LVMI), content of myocardial collagen (MC) in left ventricle, extracellular matrix fibronectin (FN), laminin (LN), cardiac fibroblast (cFb) and transforming growth factor-β_1 (TGF-β_1) were determined after 12 weeks of treatment. ResultsSBP had no marked pressure depressive effect, but had the effect similar to that of benazepril in reducing the level of LVM, LVMI and content of MC (P<0.05), as well as the content of LN, FN in myocardium, cFb count and TGF-β_1 expression (P<0.05). ConclusionSBP can prevent and treat myocardial fibrosis, whose action is independent of its hypotensive effect. The mechanism may be associated with such factors as the decrease of MC synthesis in left ventricle and the deposition of extracellular matrix.
出处
《中国中西医结合杂志》
CAS
CSCD
北大核心
2005年第4期350-353,共4页
Chinese Journal of Integrated Traditional and Western Medicine
