合成肽S247预先给药对大鼠呼吸机相关性肺损伤的影响1华中科技大学同济医学院附属协和医院麻醉科,武汉430022桂平武庆平姚尚龙【摘要】目的研究合成肽S247预先给药对大鼠呼吸机相关性肺损伤(VILI)的影响及其机制。方法24只雄性SD大鼠随机分为3组(n=8),对照组(C组):不进行机械通气;高潮气量组(H组):潮气量40ml/kg,呼气末正压0cmH2O,呼吸频率40次/min,吸入氧浓度21%;S247预先给药组(S组):腹腔注射S247100mg.kg-1.d-11次/d,持续2周,在最后一次注射30min后开始机械通气,机械通气的参数设定同H组。C组和H组在相同的时间点注射等量的生理盐水。机械通气4h后放血处死大鼠,取肺组织,光镜下观察肺病理变化,测定肺湿/干重比(W/D),免疫组化检测转化生长因子-β1(TGF-β1)的表达;收集支气管肺泡灌洗液(BALF),测定总蛋白(TP)含量、肿瘤坏死因子α(TNF-α)和巨噬细胞炎性蛋白2(MIP-2)的浓度,并进行白细胞(WBC)计数。结果与C组比较,H组和S组W/D、WBC计数、TP含量和TGF-β1的表达升高(P<0.01),H组MIP-2的浓度升高(P<0.01)并且肺组织病理学改变严重;与H组比较,S组W/D、WBC计数、TP含量、TNF-α和MIP-2浓度和TGF-β1的表达降低(P<0.01或0.05),肺组织病理学改变明显减轻。结论S247预先给药可减轻大鼠VILI,其机制与抑制了TGF-β1的激活有关。【关键词】呼吸窘迫综合征,成人;呼吸,人工;转化生长因子-β1EffectofsynthesizedpeptideS247pretreatmentonventilator-inducedlunginjuryinratsWUQing-pingDepartmentofAnesthesiology,UnionHospital,TongjiMedicalCollege,HuangzhongUniversityofScienceandTechnology,Wuhan430022,China【Abstract】ObjectiveToinvestigatetheeffectofsynthesizedpeptideS247pretreatmentonventilator-inducedlunginjury(VILI)anditspossiblemechanism.MethodsTwentyfourmaleSDratsweighing250-313gwererandomlydividedinto3group(n=8each):controlgroup(groupC):nomechanicalventilation;hightidalvolumegroup(groupH):40ml/kgtidalvolume,0cmH2Oofpositiveend-expiratorypressure,40breaths/minandFiO2=0.21;S247pretreatmentgroup(groupS):RatsingroupSreceivedintraperitonealinjectionofS247onetimeeveryday(100mg.kg-1.d-1)1作者单位:430022武汉,华中科技大学同济医学院附属协和医院麻醉科andthetreatmentlastedfortwoweeks.Mechanicalventilationstarted30minafterthelastinjectionandmechanicalventilationsettingswerethesameasgroupH.RatsingroupCandgroupHwereinjectedwithequalvolumeofnormalsalineatthesametime.Theanimalsweresacrificedbyexsanguinationattheendof4hmechanicalventilation.Thelungswereremovedfor(1)microscopicexamination,measuringwet-to-dryweightratios(W/D)anddeterminationoftransforminggrowthfactor-β1(TGF-β1)expression,and(2)broncho-alveolarlavageanddeterminationoftotalprotein(TP)contents,TNF-αandMIP-2concentrationsandWBCcountsinbroncho-alveolarlavagefluid(BALF).ResultsGroupHshowedserioushistopathologicdamageandthedamageofgroupSwaslesspronounced.W/D,WBCcounts,TPcontentsandTGF-β1expressioningroupHandgroupSandMIP-2concentrationingroupHweresignificantlyhigherthaningroupC(P<0.01).W/D,WBCcounts,TPcontents,concentrationsofTNF-αandMIP-2andTGF-β1expressioningroupSweresignificantlylowerthaningroupH(P<0.01or0.05).ConclusionPretreatmentwithS247cansignificantlyinhibittheactivationofTGF-β1andattenuateVILIinrats.【Keywords】Respiratorydistresssyndrome,adult;Respiration,artificial;Transforminggrowthfactor-β1机械通气是临床救治呼吸功能严重受损病人一种必不可少的治疗手段,但使肺受到了过度的机械牵拉。过度的机械牵拉会破坏肺的结构,影响气体交换和激活炎症反应,导致呼吸机相关性肺损伤(VILI)的发生。其重要的组织病理学特点为水肿,白细胞渗出和肺泡毛细血管膜的破坏[1]。转化生长因子-β1(TGF-β1)在...