摘要
目的探讨他克莫司(FK506)对压力负荷性心肌肥厚的影响及机制。方法♂Wistar大鼠随机分为假手术组(S组)、模型组(M组)、FK506给药组(F组),每组10只。制造腹主动脉缩窄大鼠模型,F组术前3天到术后4周给予FK506(0.5 mg.kg-1.d-1)肌肉注射,其他组给予等剂量溶剂。行心脏超声学检查,并采用Real-time PCR、Westernblot、免疫荧光、ELISA等方法检测ANP、钙调神经素(calci-neurin,CaN)及Toll样受体4(Toll-like receptor 4,TLR4)系统相关信号蛋白的表达。结果 M组与S组相比,心脏体积及心肌细胞变大(P<0.01),伴有ANP、CaN mRNA水平明显升高和TLR4系统相关信号蛋白表达升高(均有P<0.05)。FK506抑制心脏体积及心肌细胞变大(P<0.05),下调ANP、CaN及TLR4系统相关信号蛋白表达水平(均有P<0.05)。结论 CaN信号系统在心肌肥厚中发挥重要作用;FK506可能通过CaN及TLR4信号系统抑制心肌肥厚。
Aim To explore the effect of tacrolimus (FKS06) on cardiac hypertrophy and TLR4 signaling pathway in myocardium. Methods Thirty male Wist- ar rats were randomly divided into three groups: sham- operation group ( S group ) , model group ( M group ) , and FKS06 group (F group ). Model rats underwent constriction of abdominal aorta (AAC). Rats from F group were conditioned with FK506 (0. 5 mg kg-1 body weight every day)from three days before AAC to four weeks after AAC by intramuscular injection. After transthoracic echocardiographic analysis, hearts were stored at -80℃ for real-time quantitative PCR, West- ern blot, immunofluorescence, and enzyme-linked im- munoadsordent assay (ELISA). Results Both the size of heart and cardiomyocyte and the level of ANP, cal- cineurin (CaN) mRNA and TLR4 signaling molecules were increased (P 〈0.01; P 〈0.05) in M group, compared with S group. FK506 lowered heart and the cardiomyocytes size (P 〈 0. 05 ), and inhibited expres- sion of ANP, CaN and TLR4 signaling molecules sig- nificantly. Conclusion CaN plays an important role in the progress of cardiac hypertrophy. FK506 may in- hibit AAC-induced cardiac hypertrophy by CaN and TLR4 signal systems.
出处
《中国药理学通报》
CAS
CSCD
北大核心
2013年第7期1004-1007,共4页
Chinese Pharmacological Bulletin
基金
山东省自然科学基金资助项目(No ZR2010HM116)