p38MAPK信号转导通路在大鼠内毒素性急性肺损伤中的作用

目的 探讨p38丝裂原活化蛋白激酶(p38MAPK)信号转导通路在大鼠内毒素性急性肺损伤中的作用.方法 成年雄性SD大鼠60只,体重180～230 g,采用随机数字表法,将大鼠随机分为4组:对照组(C组,n=6)、急性肺损伤组(ALI组,n=24)、p38MAPK特异性抑制剂SB203580+ALI组(SB+ALI组,n=24)和SB203580组(SB组,n=6).ALI组尾静脉注射内毒素5 mg/kg制备大鼠急性肺损伤模型,C组给予等容量生理盐水,SB+ALI组于注射内毒素前30 min经尾静脉注射SB20358010 mg/kg.ALI组和SB+ALI组于注射内毒素后1、3、6 h(T1-3)时随机取8只大鼠,C组和SB组分别于给予生理盐水、SB203580后1 h处死取肺组织,检测磷酸化p38MAPK(p-p38MAPK)蛋白表达.T3时回收支气管肺泡灌洗液(BALF),测定蛋白浓度.计算细胞凋亡指数,观察肺组织病理学结果.另取32只大鼠,采用随机数字表法,将大鼠随机分为2组(n=16):ALI组和SB+ALI组,观察48 h内大鼠生存情况.结果 与C组相比,ALI组和SB+ALI组BALF中蛋白浓度、细胞凋亡指数、肺组织p-p38MAPK蛋白表达水平升高(P＜0.05);与ALI组相比,SB+ALI组上述指标降低(P＜0.05).SB+ALI组病理学损伤程度较ALI组明显减轻.ALI组大鼠生存率较SB+ALI组降低(P＜0.01).结论 p38MAPK信号转导通路参与了大鼠内毒素性急性肺损伤的发生和发展,可能与肺组织细胞凋亡有关.

Abstract：

Objective To investigate the role of p38 mitogen-activated protein kinase (MAPK) signal transduction pathway in lipopolysaccharide (LPS)-induced acute lung injury (ALI).Methods Sixty male SD rats weighing 180-230 g were randomly divided into 4 groups: control group (group C, n = 6), ALI group ( n = 24),p38MAPK specific inhibitor SB203580 + ALI group (group SB + ALI, n = 24), SB203580 group (group SB,n =6). LPS 5 mg/kg was injected intravenously via tail vein in group ALI and SB + ALI, while the equal volume of normal saline was given instead in group C. Group SB + ALI received iv injection of SB203580 10 mg/kg via tail vein 30 min before LPS administration. Group SB received injection of SB203580. The rats were sacrificed at 1, 3 and6 h agter LPS administration (T1-3) in group ALI and SB + ALI (8 rats at each time point) andat 1 h after administration in C and SB groups. The lungs were immediately removed for microscopic examination and determination of phosphorylated p38MAPK (p-p38MAPK) expression, the concentration of protein in bronchoalveolar lavage fluid (BALF) and apoptotic index (AI). Another 32 rats were selected and randomly divided into 2 groups for survival study: ALI group and SB + ALI group ( n = 16 each), and then they were treated as mentioned above and observed for 48 h. Results The concentration of protein in BALF, AI and p-p38MAPK expression were significantly increased in group ALI and SB + ALI compared with group C, while decreased in group SB + ALI compared with group ALI ( P ＜ 0. 05 ). LPS-induced pulmonary histological changes were significantly attenuated in group SB + ALI compared with group ALI. The survival rate was significantly decreased in group ALI compgred with group SB + ALI ( P ＜ 0.01 ). Conclusion p38 MAPK signal transduction pathway is involved in LPS-induced ALI, which may be related to the apoptosis in the cells in the lung.     

c-Jun氨基末端激酶在大鼠内毒素性急性肺损伤中的作用

目的 评价c-Jun氨基末端激酶(JNK)在大鼠内毒素性急性肺损伤中的作用.方法 雄性成年SD大鼠80只,体重250～300 g,采用随机数字表法,将其随机分为4组(n=20):对照组(C组)、急性肺损伤组(ALI组)、SP600125组(S组)和二甲基亚砜组(D组).ALI组、S组和D组尾静脉注射LPS 5 mg/kg,C组尾静脉注射等容量生理盐水;S组和D组给予LPS后,分别尾静脉注射JNK抑制剂SP600125 30 mg/kg或二甲基亚砜0.2 ml.于给予LPS后4 h时,各组处死10只大鼠,回收支气管肺泡灌洗液(BALF)并取肺组织,采用ELISA法检测BALF中TNF-α和IL-1β的浓度,计算肺组织湿重/干重比(W/D比),观察肺组织病理学结果,并进行肺损伤评分.各组其余10只大鼠观察至给予LPS后48 h,记录大鼠生存情况.结果 与C组比较,其余各组BALF中TNF-α和IL-1β的浓度、肺组织W/D比和肺损伤评分升高,生存率降低(P<0.05或0.01);与ALI组比较,S组BALF中TNF-α和IL-1度、肺组织W/D比和肺损伤评分降低,生存率升高(P<0.01),D组差异无统计学意义(P>0.05).结论 JNK的活化参与了大鼠内毒素性急性肺损伤的发生发展.

Abstract：

Objective To evaluate the role of c-Jun N-terminal kinase (JNK) in lipopolysaccharide (LPS)-induced acute lung injury ( ALI) in rats.Methods Eighty male SD rats weighing 250-300 g were randomly divided into 4 groups ( n = 20 each) : control group (group C) ; ALI group; LPS + SP600125 (JNK inhibitor)group (group S) and LPS+ DMSO (the solvent) group (group DMSO) . ALI was induced by intravenous LPS 5mg/kg. In S and DMSO groups, SP600125 30 mg/kg and DMSO 0.2 ml were injected intravenously after LPS administration respectively. Ten animals were sacrificed by exsanguinafions at 4 h after LPS administration in each group. The broncho-alveolar lavage fluid (BALF) was colleted. The TNF-α and IL-1β concentrations in BALF were measured. The lungs were removed for microscopic examination and determination of W/D lung weight ratio. The other 10 animals in each group were observed for 48 h survival rate. Results Intravenous LPS significantly increased TNF-α and IL-1β concentrations in BALF and W/D lung weight ratio, decreased 48 h survival rate and induced histologic damage. Intravenous SP600125 30 mg/kg significantly attenuated the above-mentioned LPS-induced changes. Conclusion Activation of JNK is involved in the development of endotoxin-induced ALI in rats.     

地塞米松对内毒素性急性肺损伤大鼠肺组织MKP-1表达的影响

目的 评价地塞米松对内毒素性急性肺损伤大鼠肺组织丝裂原活化蛋白激酶磷酸酶-1(MKP-1)表达的影响.方法 成年雄性SD大鼠54只,体重180～ 230 g,采用随机数字表法,将其随机分为3组:对照组(C组,n=6)、急性肺损伤组(ALI组,n=24)和地塞米松组(D组,n=24).ALI组和D组尾静脉注射LPS 5 mg/kg制备大鼠急性肺损伤模型,C组给予等容量生理盐水,D组于注射LPS前30 min时腹腔注射地塞米松6 mg/kg.C组于注射生理盐水后1 h(T1)时,ALl组和D组分别于注射LPS后1、3和6 h(T1-3)时,随机处死8只大鼠,取肺组织,检测MKP-1和磷酸化p38丝裂原活化蛋白激酶MAKP(p-p38MAPK)的表达.T3时回收支气管肺泡灌洗液(BALF),测定蛋白和TNF-α的浓度;观察肺组织病理学结果.另取32只SD大鼠,体重180～ 230 g,采用随机数字表法,将其随机分为2组(n=16):急性肺损伤组(ALI1组)和地塞米松组(D1组),处理方法同上.观察48 h内大鼠生存情况.结果 与C组比较,ALI组BALF中蛋白和TNF-α的浓度升高,T1-3时p-p38MAKP表达上调,T2.3时MKP-1表达下调,D组BALF中TNF-α浓度升高,T1-3时p-p38MAKP和MKP-1表达上调(P＜0.05);与ALI组比较,D组BALF中蛋白和TNF-α的浓度下降,T1-3时p-p38MAKP表达下调,MKP-1表达上调(P＜0.05),病理学损伤减轻.D1组大鼠生存率高于ALI1组(P＜0.05).结论 地塞米松减轻大鼠内毒素性急性肺损伤的机制与上调肺组织MKP-1的表达,抑制p38MAPK的磷酸化,降低炎性反应有关.     

c-Jun氨基末端激酶在大鼠内毒素性急性肺损伤中的作用

Objective To evaluate the role of c-Jun N-terminal kinase (JNK) in lipopolysaccharide (LPS)-induced acute lung injury ( ALI) in rats.Methods Eighty male SD rats weighing 250-300 g were randomly divided into 4 groups ( n = 20 each) : control group (group C) ; ALI group; LPS + SP600125 (JNK inhibitor)group (group S) and LPS+ DMSO (the solvent) group (group DMSO) . ALI was induced by intravenous LPS 5mg/kg. In S and DMSO groups, SP600125 30 mg/kg and DMSO 0.2 ml were injected intravenously after LPS administration respectively. Ten animals were sacrificed by exsanguinafions at 4 h after LPS administration in each group. The broncho-alveolar lavage fluid (BALF) was colleted. The TNF-α and IL-1β concentrations in BALF were measured. The lungs were removed for microscopic examination and determination of W/D lung weight ratio. The other 10 animals in each group were observed for 48 h survival rate. Results Intravenous LPS significantly increased TNF-α and IL-1β concentrations in BALF and W/D lung weight ratio, decreased 48 h survival rate and induced histologic damage. Intravenous SP600125 30 mg/kg significantly attenuated the above-mentioned LPS-induced changes. Conclusion Activation of JNK is involved in the development of endotoxin-induced ALI in rats.     

c-Jun氨基末端激酶在大鼠内毒素性急性肺损伤中的作用

Objective To evaluate the role of c-Jun N-terminal kinase (JNK) in lipopolysaccharide (LPS)-induced acute lung injury ( ALI) in rats.Methods Eighty male SD rats weighing 250-300 g were randomly divided into 4 groups ( n = 20 each) : control group (group C) ; ALI group; LPS + SP600125 (JNK inhibitor)group (group S) and LPS+ DMSO (the solvent) group (group DMSO) . ALI was induced by intravenous LPS 5mg/kg. In S and DMSO groups, SP600125 30 mg/kg and DMSO 0.2 ml were injected intravenously after LPS administration respectively. Ten animals were sacrificed by exsanguinafions at 4 h after LPS administration in each group. The broncho-alveolar lavage fluid (BALF) was colleted. The TNF-α and IL-1β concentrations in BALF were measured. The lungs were removed for microscopic examination and determination of W/D lung weight ratio. The other 10 animals in each group were observed for 48 h survival rate. Results Intravenous LPS significantly increased TNF-α and IL-1β concentrations in BALF and W/D lung weight ratio, decreased 48 h survival rate and induced histologic damage. Intravenous SP600125 30 mg/kg significantly attenuated the above-mentioned LPS-induced changes. Conclusion Activation of JNK is involved in the development of endotoxin-induced ALI in rats.     

肺组织γ-氨基丁酸A型受体在大鼠内毒素诱发急性肺损伤中的作用

目的 探讨肺组织γ-氨基丁酸A型受体(GABAAR)在大鼠内毒素诱发急性肺损伤中的作用.方法 成年健康雄性Wistar大鼠32只,8周龄,体重200 ～ 230 g,采用随机数字表法,将其随机分为4组(n=8)∶正常对照组(C组)、内毒素组(LPS组)、γ-氨基丁酸预先给药+内毒素组(GABA组)和GABAAR拮抗剂荷包牡丹碱预先给药+内毒素组(BIC组).LPS组、GABA组和BIC组尾静脉注射LPS 5 mg/kg,C组给予等容量生理盐水;GABA组和BIC组分别于给予LPS前30 min时腹腔注射γ-氨基丁酸50 mg/kg和荷包牡丹碱10 μmol/kg.于给予LPS后6h时,采集动脉血样,测定PaO2,然后取肺组织,测定肺湿/干重比(W/D)、GABAAR表达、IL-6、TNF-α、MDA的含量和SOD活性,光镜下观察肺组织病理学结果.结果 与C组比较,LPS组、GABA组和BIC组PaO2降低,LPS组和GABA组肺组织W/D、TNF-α、IL-6和MDA的含量升高,肺组织GABAAR表达上调,肺组织SOD活性降低(P＜0.05);与LPS组比较,GABA组肺组织W/D、TNF-α、IL-6和MDA的含量升高,肺组织GABAAR表达上调,肺组织SOD活性降低(P＜0.05),而BIC组上述指标差异无统计学意义,GABA组和BIC组PaO2差异无统计学意义(P＞0.05).结论 肺组织GABAAR参与了大鼠内毒素诱发急性肺损伤的发展.     

p38MAPK/iNOS/HO-1信号通路在赤芍减轻大鼠内毒素性急性肺损伤中的作用

目的 评价p38MAPK/iNOS/HO-1信号通路在赤芍减轻大鼠内毒素性急性肺损伤(AL1)中的作用.方法 健康清洁级雄性Wistar大鼠40只,随机分为5组(n=8):生理盐水对照组(C组)、内毒素组(L组)、赤芍组(R组)、赤芍预处理组(PR组)和SB203580组(S组).气管内滴注脂多糖(LPS)制备大鼠ALI模型.L组气管内滴注1 ml LPS溶液(2.5 mg/kg);C组滴注等容量生理盐水;R组、PR组分别于气管内滴注LPS后、滴注前2 h,经股静脉输注赤芍注射液15 mg·kg-1·h-1 2 h;S组于气管内滴注LPS前3 h,经股静脉输注SB203580溶液2.5 μmol·kg-1·h-1 3 h.于气管内滴注LPS后6 h时,经颈动脉采血样2 ml,行血气分析及测定血清NO浓度;颈动脉放血处死大鼠,测定支气管肺泡灌洗液蛋白浓度,计数中性粒细胞及细胞总数,检测肺组织MDA含量,p38MAPK、HO-1及iNOS的表达.观察肺组织病理学结果 .结果 与C组比较,其余各组肺组织p38MAPK、iNOS及HO-1表达上调,支气管肺泡灌洗液中性粒细胞计数比、蛋白浓度、肺组织MDA含量及血清NO浓度升高.PaO2和HCO1浓度降低(P<0.01);与L组比较,R组、PR组和S组p38MAPK及iNOS表达下调,HO-1表达上调.支气管肺泡灌洗液中性粒细胞计数比、蛋白浓度、肺组织MDA含量及血清NO浓度降低,PaO2和HCO3-升高(P<0.05);R组、PR组和S组肺组织损伤程度较L组减轻.结论 赤芍可减轻大鼠内毒素性急性肺损伤,可能与抑制p38MAPK/iNOS/HO-1信号通路有关.     

糖皮质激素受体对内毒素性急性肺损伤大鼠的保护作用及机制

目的 探讨糖皮质激素受体(glucocorticoid receptor,GR)在内毒素急性肺损伤(acute lung injury,ALI)中的作用及机制.方法 SD雄性大鼠84只,随机数字表法分为5组:Control组,仅注射生理盐水;脂多糖(lipopoIysaccharide,LPS)组,经尾静脉注射LPS 5 mg/kg;地塞米松(dexamethasone,DEX)+LPS组,注射LPS前30 min腹腔注射Dex 6 mg/kg;米非司酮(RU486)组,皮下注射GR拮抗剂RU486 20 mg/kg,90 min后经尾静脉注射生理盐水;RU486+Dex+LPS组,按照上述顺序分别注射RU486、Dex和LPS.Control组和RU486组6 h后,其余3组分别在1、3、6 h各时间点处死.检测各组大鼠支气管肺泡灌洗液(brobehoalveolar lavage fluid,BALF)中蛋白浓度,肺水系数(1ung index,LI),肺组织的病理变化,凋亡指数(apoptosis index,AI)以及肺组织中p38MAPK的活化状态及表达.结果 与Control组BALF中蛋白浓度(49±5)g/L、LI(2.36±0.14)、AI(12.0±1.7)%相比,LPS组分别为(77±9)g/L、5.93±0.44、(43.9±3.1)%(P＜0.05),HE染色显示肺组织炎症和损伤严重.与LPS组相比,Dex+LPS组分别为(54±4)g/L、3.77±0.48、(32.7±2.7)%(P＜0.05),且肺组织损伤程度减轻,应用GR抑制剂RU486后,Dex的肺保护作用消失.另外,LPS组肺组织中磷酸化p38MAPK(p-p38MAPK)的表达与Control组相比显著升高(P＜0.05);与LPS相比,Dex+LPS组p-p38MAPK表达下调(P＜0.05),而RU486+Dex+LPS组的表达上调(P＞0.05).结论 糖皮质激素受体在内毒素导致的急性肺损伤中发挥着重要的作用.激素活化的GR可能通过抑制p38MAPK的活化/磷酸化抑制肺组织细胞的凋亡,缓解肺损伤的程度.     

p38MAPK信号通路在内毒素性休克诱发急性肺损伤大鼠肺组织HO-1表达上调中的作用

目的 评价p38丝裂原活化蛋白激酶(p38MAPK)信号通路在内毒素性休克诱发急性肺损伤大鼠肺组织血红素加氧酶-1(HO-1)表达上调中的作用.方法 雄性SD大鼠48只,8周龄,体重180～ 200g,采用随机数字表法,将其随机分为4组(n=12):对照组(C组)、内毒素性休克组(LS组)、内毒素性休克+ p38MAPK特异性抑制剂SB203580组(LSS组)和SB203580组(SB组).C组和SB组股静脉注射生理盐水0.5 ml;LS和LSS组股静脉注射LPS 10 mg/kg(溶于0.5ml生理盐水);2h内MAP下降至基础值的75％时,C组和IS组股静脉输注10％二甲基亚砜0.1ml;LSS组和SB组股静脉输注SB203580 5 μmol/kg(溶于0.1 ml 10％二甲基亚砜),输注速率0.01 ml/min.给予LPS或生理盐水后6h时采集动脉血样,进行血气分析,计算氧合指数(PaO2/FiO2);然后处死大鼠取肺组织,光镜下观察病理学结果,并进行病理学损伤评分,计算肺含水率,测定SOD活性、MDA含量、HO-1 mRNA及其蛋白、p38MAPK蛋白和磷酸化p38MAPK(p-p38MAPK)蛋白的表达.结果 与C组比较,IS组和LSS组氧合指数和SOD活性降低,病理学损伤评分、肺含水率和MDA含量升高,肺组织HO-1 mRNA及其蛋白和p-p38MAPK蛋白的表达上调(P＜0.05),p38MAPK蛋白表达差异无统计学意义,SB组各指标差异无统计学意义(P＞0.05);与LS组比较,LSS组氧合指数和SOD活性升高,病理学损伤评分、肺含水率和MDA含量降低,肺组织HO-1 mRNA及其蛋白表达上调,p-p38MAPK蛋白表达下调(P＜0.05),p38MAPK蛋白表达差异无统计学意义(P＞0.05).结论 抑制p38MAPK信号通路可导致内毒素性休克诱发急性肺损伤大鼠肺组织HO-1表达上调.     

MLK3-MKK3/6-p38MAPK信号转导通路在大鼠内毒素性急性肺损伤中的作用

目的 探讨MLK3-MKK3/6-p38MAPK信号转导通路在大鼠内毒素性急性肺损伤中的作用.方法 健康成年雄性SD大鼠78只,体重200～250 g,随机分为4组:对照组(C组,n=6)、急性肺损伤组(ALI组,n=24)、MLK3抑制剂K252a组(MK组,n=24)和p38MAPK特异性抑制剂SB203580组(MS组,n=24).ALI组尾静脉注射内毒素5 mg/kg制备大鼠急性肺损伤模型,C组给予等容量生理盐水,MK组和MS组于注射内毒素前30 min经尾静脉分别注射K252a 75μg/kg、SB203580 10 mg/kg.ALI组、MK组和MS组于注射内毒素后1、3、6、12 h(1-4)时各组随机取6只大鼠,C组于给予生理盐水后即刻处死取肺,采用ELISA法测定支气管肺泡灌洗液中TNF-α浓度,称重后计算肺湿干重比,采用Western b1ot法测定p-MLK3、p-MKK3/6及p-p38MAPK的表达,观察肺组织病理学结果.结果 与C组比较,ALI组、MK组和MS组各时点支气管肺泡灌洗液中TNF-α浓度、肺湿干重比、p-MLK3、p-MKK3/6及p-p38MAPK的表达水平升高(P＜0.01);与ALI组比较,MK组上述指标降低,MS组支气管肺泡灌洗液中TNF-α浓度、肺湿干重比、p-p38MAPK表达水平降低(P＜0.05).病理学结果显示:MK组和MS组肺组织损伤较ALI组减轻.结论 MLK3-MKK3/6-p38MAPK信号转导通路在大鼠内毒素性急性肺损伤中起重要作用.     

促红细胞生成素预先给药对大鼠内毒素性急性肺损伤的影响

目的 探讨促红细胞生成素(EPO)预先给药对大鼠内毒素性急性肺损伤的影响.方法 成年雄性SD大鼠32只,体重180～220 g,随机分为4组(n=8),C组腹腔注射生理盐水4 ml/kg(EPO溶剂对照),30 min后静脉注射生理盐水2 ml/kg[脂多糖(LP3)溶剂对照];EPO组腹腔注射EPO3 000 U/kg,30 min后静脉注射生理盐水2 ml/kg;LPS组腹腔注射生理盐水4 ml/kg,30 min后静脉注射LPS 6 mg/kg;EPO+LPS组腹腔注射EPO 3 000 U/kg,30 min后静脉注射LPS 6 mg/kg.于静脉注射LPS后4 h时处死大鼠,观察肺组织病理学结果 ,计算肺组织湿/干重(W/D)比;测定肺组织髓过氧化物酶(MPO)活性和丙二醛(MDA)、一氧化氮(NO)含量;采用Western blot法测定肺组织诱导型一氧化氮合酶(iNOS)和硝基酪氨酸(NT)的表达.结果 与C组相比,LPS组和EPO+LPs组肺组织W/D比、MPO活性、MDA和NO含量升高,iNOS和NT表达上调(P<0.01);与LPS组相比,EPO+LPS组肺组织W/D比、MPO活性、MDA和NO含量降低,iNOS和NT表达下调(P<0.01).结论 EPO预先给药可减轻大鼠内毒素性急性肺损伤,与其下调iNOS表达,减少NO生成有关.     

戊乙奎醚预处理对脓毒症小鼠肺损伤时MAPK信号转导通路的影响

目的 探讨戊乙奎醚(PHC)预处理对脓毒症小鼠肺损伤时丝裂原活化蛋白激酶(MAPK)信号转导通路的影响.方法 健康雌性昆明小鼠105只,体重20～25 g,随机分为3组(n=35):假手术组(S组)、脓毒症(CLP)组和戊乙奎醚(PHC)组.采用盲肠结扎并穿孔法制备脓毒症模型.PHC组于造模前1 h腹腔注射戊乙奎醚0.45 mg/kg,s组和CLP组于造模前1 h注射等容量生理盐水.于造模后即刻测定肺微血管通透性;造模后12 h时进行动脉血气分析,观察肺组织病理结果,测定肺组织丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性和磷酸化的p38丝裂原活化蛋白激酶(p38MAPK)、细胞外信号调节激酶(ERK1/ERK2)和c-jun氨基末端蛋白激酶(JNK)表达.结果 与S组比较,CLP组PaO2、PaO2/FiO2和pH值降低,肺微血管通透性和肺组织MDA含量升高,SOD活性降低,磷酸化的p38MAPK、ERK1/ERK2和JNK表达上调(P<0.05或0.01);与CLP组比较,PHC组PaO2、PaO2/FiO2和pH值升高,肺微血管通透性和肺组织MDA含量降低,SOD活性升高,磷酸化的p38MAPK和ERK1/ERK2表达下调(P<0.05或0.01).结论 戊乙奎醚预处理可通过抑制MAPK信号转导通路(p38MAPK和ERK1/ERK2)的激活,从而减轻脓毒症小鼠肺损伤.     

盐酸戊乙奎醚预先给药对大鼠内毒素性急性肺损伤时缺氧诱导因子-1α表达的影响

目的 评价盐酸戊乙奎醚预先给药对大鼠内毒素性急性肺损伤时缺氧诱导因子-1α(HIF-1α)表达的影响.方法 健康成年雌性SD大鼠120只,体重180 ～ 220 g,采用随机数字表法,将大鼠随机分为3组(n=40):对照组(C组)、急性肺损伤组(ALI组)和盐酸戊乙奎醚预先给药组(P组).采用腹腔注射内毒素5 mg/kg制备大鼠内毒素性急性肺损伤模型.C组腹腔注射等量生理盐水,P组于注射内毒素前30 min时腹腔注射盐酸戊乙奎醚2 mg/kg.于注射内毒素后2、4、8和24 h时各组随机取8只大鼠处死取肺,采用RT-PCR法检测肺组织HIF-1α mRNA的表达.于注射内毒素后6h时随机取8只大鼠处死取肺,测定湿干重比(W/D比),用ELISA法检测肺组织IL-6的含量,光镜下观察肺组织病理学结果.结果 与C组比较,ALI组和P组注射内毒素后6h时W/D比、IL-6含量、各时点HIF-1α表达水平升高(P＜0.05);与ALI组比较,P组注射内毒素后6h时W/D比、IL-6含量、各时点HIF-1α表达水平降低(P＜0.05).P组肺组织病理学损伤程度较ALI组减轻.结论 盐酸戊乙奎醚预先给药通过下调肺组织HIF-1α表达,抑制炎性反应,从而减轻大鼠内毒素性急性肺损伤.