乌司他丁对内毒素血症大鼠心肌TOLL样受体4表达的影响

目的 观察乌司他丁对脂多糖(Lipopolysaccharides,LPS)诱导心肌TOLL样受体4(TLR4)受体表达的影响及与炎症反应的关系.方法 选取8周龄的雄性SD大鼠32只,分成四组:正常对照组,内毒素血症组(LPS组),LPS+乌司他丁组,LPS+地塞米松组.除正常对照组以外,其余三组给予脂多糖8 mg/kg大鼠阴茎静脉注射,LPS+乌司他丁组与LPS+地塞米松组分别同时给予乌司他丁2.5万/kg、地塞米松5 mg/kg;正常对照组给予同量的生理盐水,3h后断头取血并取心肌液氮保存；ELISA法测血浆TNF-α的水平；放免法测定心肌组织中AngⅡ水平；RT-PCR法测定心肌组织TLR4 mRNA表达；免疫组化法和蛋白免疫印迹法测心肌组织TLR4含量.结果 (1)LPS组TNF-α、CRP、IL-6水平和心肌AngⅡ水平显著增高；与LPS组相比,乌司他丁组TNF-α 、CRP、IL-6和心肌AngⅡ显著降低(2)LPS可明显增加心肌中TLR 4 mRNA及蛋白表达,乌司他丁明显抑制心肌TLR4 mRNA及蛋白的表达.结论 乌司他丁能抑制LPS诱导大鼠心肌的炎症反应.乌司他丁能降低LPS诱导大鼠的心肌TLR4 mRNA及蛋白的表达.乌司他丁可能通过降低TLR4水平抑制LPS诱导的炎症反应.

Effects of ulinastatin on the expression of TOLL like receptor 4 in endotoxemia rats

Objective To observe the effect of ulinastatin on the expression of TOLL like receptor 4(TLR4) in lipopolysaccharide(lipopolysaccharides,LPS) induced endotoxemia rats and its relationship to inflammation.Methods 32 male SD rats aged 8 w were divided into normal control,endotoxemia(LPS group,given LPS 8 mg/kg),LPS + Ulinastatin,LPS + dexamethasone groups(given Ulinastatin 25 000 U/kg,5 mg/kg dexamethasone,respectively).Three hours later,the blood and myocardial were preserved in liquid nitrogen.The level of ...