煙霧暴露大鼠肺血管內(nèi)皮型一氧化氮合酶及一氧化氮的表達(dá)變化
發(fā)布時(shí)間:2018-05-17 18:34
本文選題:煙霧暴露 + 肺動(dòng)脈壓; 參考:《山西醫(yī)科大學(xué)》2012年碩士論文
【摘要】:目的探討不同煙霧暴露量對大鼠肺動(dòng)脈壓及肺血管內(nèi)皮型一氧化氮合酶(endothelialnitricoxidesynthase,eNOS)和一氧化氮(nitricoxide,NO)表達(dá)的影響。 方法健康雄性SD大鼠28只,隨機(jī)分為對照組(C組)、煙霧暴露1月組(S1m組)、煙霧暴露2月組(S2m組)與煙霧暴露3月組(S3m組),每組7只,建立大鼠被動(dòng)吸煙模型。檢測各組大鼠右心室收縮壓(mRVSP)與右心室肥大指數(shù)(RVHI),硝酸還原酶法檢測肺組織一氧化氮(NO)的相對含量,免疫組化法檢測肺血管內(nèi)皮型一氧化氮合酶(eNOS)蛋白的表達(dá),并分析各指標(biāo)的相關(guān)性。 結(jié)果①S3m組mRVSP及RVHI(65.63±0.93,54.79±7.13)高于C組(16.85±1.26,36.62±1.32)、S1m組(23.57±14.51,37.38±0.73)與S2m組(24.07±4.18,32.41±0.26),差異均有統(tǒng)計(jì)學(xué)意義(均P<0.01)。C組、S1m組與S2m組間差異無統(tǒng)計(jì)學(xué)意義(P>0.05);②S1m組、S2m組與S3m組肺血管內(nèi)皮細(xì)胞eNOS蛋白表達(dá)(0.32±0.04,0.31±0.03,,0.24±0.03)均低于C組(0.43±0.06),差異均有統(tǒng)計(jì)學(xué)意義(均P<0.01)。S3m組低于S1m組和S2m組,差異均有統(tǒng)計(jì)學(xué)意義(均P<0.01);S1m組和S2m組差異無統(tǒng)計(jì)學(xué)意義(P>0.05)。③S1m組、S2m組和S3m組肺組織NO相對含量(1.98±0.20,1.54±0.09,0.95±0.09)均低于C組(2.98±0.19),差異均有統(tǒng)計(jì)學(xué)意義(均P<0.01),S3m組低于S1m組和S2m組,差異有統(tǒng)計(jì)學(xué)意義(P<0.01),S1m組和S2m組差異無統(tǒng)計(jì)學(xué)意義(P>0.05);④mRVSP與RVHI呈正相關(guān)(r=0.713,P<0.01),肺組織NO與mRVSP呈負(fù)相關(guān)(r=-0.615,P<0.05),肺血管eNOS與肺組織NO呈正相關(guān)(r=0.944,P<0.01)。 結(jié)論煙霧暴露可下調(diào)大鼠肺血管內(nèi)皮細(xì)胞eNOS的表達(dá),進(jìn)而影響NO的合成,參與肺動(dòng)脈壓高壓的形成,且該作用在一定范圍內(nèi)呈時(shí)間依賴性。
[Abstract]:Objective to investigate the effects of smoke exposure on pulmonary artery pressure, endothelial nitric oxide synthase (nitric oxide synthase) and nitric oxide (no) expression in rats. Methods Twenty-eight male Sprague-Dawley rats were randomly divided into control group (C group), smoke exposure group (1 month), smoke exposure group (S1m group) and smoke exposure group (S3m group, 7 rats in each group) to establish passive smoking model. The relative contents of right ventricular systolic pressure (RVSP) and right ventricular hypertrophy index (RVHIN), nitric oxide (no) in lung tissue were detected by nitrate reductase method, and the expression of nitric oxide synthase (Enos) protein in pulmonary vascular endothelium was detected by immunohistochemical method. The correlation of each index is analyzed. 緇撴灉鈶燬3m緇刴RVSP鍙?qiáng)RVHI(65.63鹵0.93,54.79鹵7.13)楂樹簬C緇
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