血红素氧合酶－1对肝硬化大鼠肺脏结构和功能的影响

目的：探讨血红素氧合酶－1/一氧化碳系统在实验大鼠肝肺综合征中的作用。 方法：35只SD大鼠随机分为肝硬化组、锌原卟啉组、钴原卟啉组和假手术组。胆总管结扎制备大鼠肝硬化模型。锌原卟啉组、钴原卟啉组模型制备同肝硬化组,仅在标本采集前24小时分别腹腔给予锌原卟啉组、钴原卟啉组30mg/Kg。测量平均动脉压、门静脉压,血气分析;病理观察肝硬化和肺血管扩张形成;应用免疫组化方法观察HO-1蛋白在肺内的表达,RT-PCR法检测肺组织中HO-1 mRNA的表达。 结果：病理显示手术组4周肝硬化形成;肺内血管扩张,肺泡间隔增加伴有肺不张。与假手术组相比,肝硬化组平均动脉压显著下降,门静脉压显著升高（P）;肺泡动脉血氧梯度增加（P）;动脉碳氧血红蛋白、肺组织HO-1蛋白及HO-1 mRNA显著增加（P< 0.05）。与肝硬化组相比,锌原卟啉组肺泡动脉血氧梯度下降、动脉碳氧血红蛋白、肺组织HO-1蛋白及HO-1 mRNA显著减少（P< 0.05）,肺内血管扩张缩小;钴原卟啉组肺泡动脉血氧梯度增高、动脉碳氧血红蛋白、肺组织HO-1蛋白及HO-1 mRNA显著增加（P< 0.05）,肺内血管扩张加重。 结论：肺内血红素氧合酶－1表达增加在肝肺综合征的发病中起着重要的作用。     

辛伐他汀对野百合碱诱导肺动脉高压大鼠血红素加氧酶1表达的影响

目的观察辛伐他汀对野百合碱致肺动脉高压大鼠的肺循环血流动力学和肺小动脉重构的作用,以及对肺组织血红素加氧酶1（HO-1）表达的影响。方法 52只SD大鼠随机分为五组：正常对照组、辛伐他汀对照组、肺动脉高压模型组、辛伐他汀治疗组和血红素加氧酶抑制剂（ZnPP）组。右心导管测定肺动脉平均压（mPAP）、右心室收缩压（RVSP）。以右心室/（左心室＋室间隔）的质量比（RVHI）作为评价右心室肥厚的指标。病理图像分析系统测定并计算动脉管壁面积百分比和动脉管壁直径百分比以评价肺血管重构严重程度。免疫组化方法观察HO-1在大鼠肺组织中表达部位,通过免疫印迹法半定量测定肺组织HO-1蛋白表达水平。结果与模型组比较,辛伐他汀治疗组mPAP、RVHI显著降低[（35.63±5.10）mm Hg比（65.78±15.51）mm Hg,0.33±0.05比0.53±0.06,P〈0.05]。辛伐他汀治疗减轻了肺血管重构,动脉管壁面积百分比和动脉管壁直径百分比分别为（50.78±9.03）%和（43.75±4.23）%,较模型组明显降低[（65.92±7.19）%,（52.00±5.35）%]。免疫组化显示在肺动脉高压模型组,HO-1主要在肺泡巨噬细胞中呈阳性表达。在辛伐他汀治疗组,HO-1表达明显增高,尤其在血管平滑肌细胞和肺泡巨噬细胞呈强阳性表达。HO-1的抑制剂ZnPP部分抑制辛伐他汀对PH大鼠的作用,其mPAP为（52.88±17.45）mm Hg,动脉管壁面积%为（50.78±9.03）%,动脉管壁直径百分比为（52.00±5.35）百分比。结论辛伐他汀减轻野百合碱诱导大鼠的肺动脉高压,抑制肺血管重构改变,其作用机制与增加HO-1表达有关。     

Heme oxygenase-1 regulates the major route involved in formation of immune hepatic fibrosis in rats

Background Heme oxygenase （HO） plays roles in some liver diseases, but what it does in immune liver fibrosis is rarely reported. We investigated the regulation mechanisms of HO-1 in rat immune liver fibrosis to find routes for intervention. Methods Male Sprague-Dawley rats were randomly divided into control group （N, n=-12）, fibrosis group （F, n=20）, cobalt protoporphyrin （CoPP） inducing group （Co, n=20） and zinc protoporphyrin （ZnPP） inhibiting group （Zn, n=20）. In groups F, Co and Zn, immune liver fibrosis was established with human serum albumin. At the attacked stage, CoPP （5 mg/kg） and ZnPP （5 mg/kg） were intraperitoneally injected in groups Co and Zn, respectively. After establishment of rat models, the numbers of rats reduced to 11, 15, 17 and 12 in groups N, F, Co and Zn respectively, because of death during the process. HO-1 in liver was detected by Western blotting and immunohistochemistry. The indexes of fibrosis were assessed by radioimmunoassay. Concentrations of serum transforming growth factor-β1 （TGF-β1）, and tissue inhibitor of metalloproteinses （TIMP-1） were detected using enzyme-linked immunosorbent assay. Hepatic stellate cell （HSC） and proliferation degree of fibrosis were assessed by pathological examination. Data analysis was performed by SPSS 10.0 software. Results The expression of HO-1 in group F was significantly higher than that in group N, but lower than that in group Co （P 〈0.05）; while that in group Zn was lower than in group F （P 〈0.05）, but still higher than that in group N （P 〈0.01）. Compared with group N, liver functional and liver fibrosis indicators were increased in group F （P 〈0.01）, while comparing to group F, they were decreased in group Co （P 〈0.05） and increased in group Zn （P 〈0.05）. CoPP reduced the extent of hepatocellular injury and hepatic fibrosis in comparison with group F （P 〈0.01）, being the opposite effect of ZnPP （P 〈0.01）. HSC was observed using indirect method and the result showed that the number of HSC in group F increased more than that in groups N and Co, while much less than in group Zn. The concentration of TGF-β1 decreased when HO-1 expressed increasingly （group Co： （3.5±1.0） ng/ml, group F： （7.8±1.3） ng/ml, P 〈0.01） and enhanced （group Zn： （9.6±13.6） ng/ml） when HO-1 presented less （P 〈0.01）. The concentrations of TIMP-1 were （151.1±32.0）, （472.0±34.8）, （232.3±41.3） and （533.2±37.2） ng/g liver wet weight in groups N, F, Co, and Zn, respectively. It was reduced in group Co （P 〈0.01） and increased in group Zn compared with group F （P 〈0.05）. Conclusions Inducing HO-1 expression appropriately may lighten hepatic fibrosis, and in contrast, inhibiting it strengthens the lesion. HO-1 interferes with the main ways to form liver fibrosis.     

异丙酚对高糖诱导心肌细胞肥大时血红素加氧酶-1表达的影响

目的:观察血红素加氧酶-1在高糖诱导的心肌细胞肥大中的表达,以及异丙酚对其表达的影响。方法:体外培养乳鼠心肌细胞,分组给药后,用BCA法测心肌细胞的蛋白质含量;用计算机图像分析系统检测心肌细胞表面积;用DCFH-DA活性氧检测试剂盒检测细胞内氧自由基的产生;用RT-PCR和Western blot分别检测心肌细胞中HO-1mRNA及蛋白表达。结果:高糖组心肌细胞表面积、细胞蛋白含量及氧自由基产生均升高。50μmol/L浓度的异丙酚对高糖诱导的肥大心肌细胞表面积、细胞蛋白含量及氧自由基的产生均有显著的抑制作用,而给予HO-1抑制剂后其作用明显减弱。结论:HO-1可能参与了异丙酚抑制心肌细胞肥大的作用。     

体内外诱导血红素加氧酶-1延长异种移植胰岛功能和生存

Background  The induced expression of heme oxygenase-1 (HO-1) in donor islets improves allograft survival. Cobalt protoporphyrin (CoPP) could significantly enhance the expression of HO-1 mRNA and protein in rat islet safely. Our work was to study how to protect pancreatic islet xenograft by CoPP-induction.

Methods  Islet xenografts treated with CoPP-induction and CoPP+ Zinc protoporphyrin (ZnPP) in vitro and in vivo were randomly transplanted into murine subrenal capsule; then the graft survival time was compared by blood glucose level and pathological examination and meanwhile the interferon γ (IFN-γ), tumor necrosis factor α (TNF-α), interleukin 10 (IL-10) and IL-1β level in serum and their mRNA and HO-1 mRNA and protein expression were examined.

Results  Islets with CoPP-induction under low- and high-glucose stimulation exhibited much higher insulin secretion compared with other three groups. CoPP-induction could increase higher expression of HO-1 (mRNA: 3.33- and 76.09- fold in vitro and in vivo; protein: 2.85- and 58.72-fold). The normoglycemia time in induction groups ((14.63±1.19) and (16.88±1.64) days) was significantly longer. The pathological examination showed less lymphocyte infiltration in induction groups. The IL-10 level and its mRNA in induction groups were significantly higher.

Conclusions  The HO-1 induced by CoPP would significantly improve function, prolong normoglycemia time and reduce lymphocyte infiltration. Meanwhile CoPP-induction in vivo had more beneficial effects than in vitro. Its mechanism could be related to immune-modulation of IL-10.

     

二氯甲烷对肝脏缺血再灌注损伤的影响

目的 探讨二氯甲烷对减轻肝脏缺血再灌注损伤的机制.方法 将80只雄性SD大鼠随机分为4组(20只/组):对照组,无任何处理;CoPP(钴-原卟啉)组,供肝收获前24 h供体腹腔注射CoPP 5 mg/kg;ZnPP(锌-原卟啉)组,供肝收获前24 h供体腹腔注射ZnPP 20mg/kg;MC(二氯甲烷)组,供肝收获前7 d,供体口服MC 500 ms/(kg·d).受体不作处理,采用双袖套法施行大鼠同基因原位肝移植(每组供体和受体各10只),移植后3 d每组各处死5只受体鼠,取出供肝并检测:移植后受体肝功能;Western印迹法和免疫组化法检测供肝血红素氧合酶-1(HO-1)的表达;TUNEL法检测供肝细胞的凋亡;Suzuki标准评分评估供肝的缺血再灌注损伤程度.每组留下5只受体鼠观察移植后的生存时间.结果 MC组、CoPP组血清的丙氨酸转氨酶(ALT)[(75±16)、(65±28)U/L]、天冬氨酸转氨酶(AST)[(185±42)、(187±43)U/L]明显较对照组[ALT(346±45)U/L、AST(474±90)U/L]和ZnPP组[ALT(578±75)U/L、AST(1084±128)U/L]低(P<0.01).CoPP组肝脏移植物的HO-1表达量中位数为3.05,明显较对照组高(P<0.05),MC组与对照组间差异无统计学意义(P>0.05).MC组和CoPP组的移植物细胞凋亡指数分别为4.1%±0.6%、3.2%±0.8%,明显较对照组(12.5%±2.4%)和ZnPP组(25.8%±3.1%)低(P<0.05).MC组、CoPP组比对照组、ZnPP组的肝细胞损伤轻、炎症细胞浸润少,MC组、CoPP组的Suzuki评分分别为0.76±0.52、0.76±0.59,明显较对照组(1.32±0.74)和ZnPP组(1.80±0.70)低(P<0.05).MC组、CoPP组的中位生存时间分别为100、93 d,较对照组(85 d)、ZnPP组(12 d)延长(P<0.05).结论 HO-1上调和二氯甲烷对肝脏移植物缺血再灌注损伤均有保护作用.     

Expression of Heme Oxygenase-1 in the Peripheral Blood Mononuclear Cells from Asthmatic Patients

Bronchialasthmaisadiseaseofchronicairwayinflammationwhichinvolvesavarietyofcellsin cludingmastocytes,granulocytes,lymphocytesetc,inwhichlymphocytesplayanespeciallyim portantpart,buttheexactmechanismshavenotbeenfullyunderstoodyet.ZayasuetalfoundthattheCOlevelsignificantlyincreasedinasthmapa tients'expiredgas,andthusinferredthatendoge neticCOmightbeinvolvedinthepathogenesisofasthma[1].EndogeneticCOoriginatesfromproto hemedegradationandintheprocesshemeoxygen ase(HO)actsasbothinitiationandrestr…     

血红素氧合酶-1对肝脏缺血再灌注损伤的保护作用

目的:探讨血红素氧合酶-1(HO-1)对肝脏缺血再灌注损伤的保护作用机制。方法:SD大鼠30只,建立二套袖法原位肝移植模型。随机分为3组:对照组,无任何处理;CoPP处理组,供肝收获前24h供体腹腔注射HO-1诱导剂CoPP5mg/kg。;ZnPP处理组,腹腔注射抑制剂ZnPP20mg/kg。移植后第三天检测肝脏移植物肝功能,免疫组织化学方法检测肝脏移植物HO-1的表达情况。TUNEL法检测凋亡变化。以Suzuki标准评分来反映肝脏移植物的缺血再灌注损伤程度。结果:①CoPP组ALT,AST较对照组和ZnPP组明显降低(P<0.01)。②HO-1表达:CoPP组明显高于其他组(P<0.05)。③移植物凋亡阳性细胞百分率:CoPP组明显低于对照组和ZnPP组(P<0.05)。④肝脏移植物病理变化:CoPP组和与对照组,ZnPP组比较,炎症细胞浸润少,肝细胞损伤轻。肝脏移植物Suzuki评分,CoPP组(0.76±0.59)明显低于对照组(1.32±0.74)与ZnPP组(1.80±0.70),有显著统计学差异(P<0.05)。结论:HO-1对肝脏移植物缺血再灌注损伤具有保护作用,其机制可能与抗炎症与抗凋亡有关。     

血红素氧化酶-1在鼠异种肝移植中的抗排斥作用及其机制研究

目的探讨血红素氧化酶1(HO1)在异种肝移植中的作用及其机制方法采用豚鼠对大鼠肝移植模型,实验动物分为3组,每组10对鼠。A组供体鼠术前24h腹腔注射5ml/kg生理盐水作为对照;B组供体术前24h腹腔注射HO1诱导剂钴原卟啉(CoPP),C组供体注射CoPP的同时给予HO1抑制剂锌原卟啉(ZnPP)。每组受体均接受眼镜蛇毒因子(CVF)。分别以RTPCR和western印迹法观察HO1mRNA及蛋白表达。通过凝胶电泳迁移率改变法(EMSA)检测移植肝核转录因子(NF)κB的活化,免疫组化观察E选择素表达,来评价HO1对内皮细胞活化的抑制作用。并比较各组受体鼠存活时间。结果各组均未发生超急性排斥反应。CoPP预处理可以诱导HO1mRNA和蛋白过度表达,进而显著抑制移植肝内NFκB的活化和内皮细胞E选择素表达;B组与(0.112±0.039)A组(0.211±0.030)、C组(0.283±0.075)相比差异有统计学意义(P<0.05)。HO1过度表达组与其它组相比,移植肝内皮细胞肿胀减轻,浸润细胞数减少,肝脏功能改善,而且受体鼠存活时间显著延长;B组(15.5h±3.8h)比A组(7.3h±2.1h)差异有统计学意义(P<0.01)。这种保护效应可被同时给予HO1抑制剂ZnPP所取消;B组比C组(6.7h±2.9h)差异有统计学意义(P<0.01)。结论HO1通过抑制内皮细胞活化,延缓异种移植肝排斥反应发生。     

血红素加氧酶-1高表达对大鼠同种异体肺移植物缺血再灌注损伤的保护作用

目的观察原卟啉钴(CoPP)诱导内源性血红素加氧酶-1(HO-1)高表达对大鼠同种异体左肺移植物缺血再灌注损伤(IRI)的影响及其作用机制。方法以SD大鼠为供受体,采用改良三袖套法技术建立同种异体左肺移植模型。设立空白对照组(A组)、CoPP+原卟啉锌(ZnPP)组(B组)和CoPP组(C组),离体供肺静脉4℃的LPDG液逆行灌注,供肺保存3h后移入受鼠,移植肺再灌注4h后阻断右肺门,测量动脉血PaO2及PaCO2。取移植肺测肺湿/干质量比率(W/D)、超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量及髓过氧化物酶(MPO)活性;观察病理组织学变化;PCR和免疫组织化学测HO-1表达;酶联免疫吸附法(ELISA)测TNF-a量的变化;TUNEL法检测移植肺细胞凋亡水平。结果与A、B组比较,C组HO-1升高,PaO2上升、肺W/D下降,SOD活性增高,MDA、TNF-a含量和MPO活性下降(P<0.01);肺泡间质水肿明显减轻,炎症细胞浸润减少,肺泡腔内水肿液和红细胞少见,细胞凋亡减少(P<0.01)。结论 CoPP诱导移植肺高表达内源性HO-1,后者通过抗氧化、抗炎和抗凋亡等多种途径减轻供肺IRI,提高肺移植术后早期肺功能。     

Heme oxygenase-1 expression in rats with acute lung rejection and implication

This study investigated the expression of hemeoxygenase-1 （HO-1） in rats with acute lung rejection and its implication. A valid rat orthotopic left lung transplantation model （SD rat→Wistar rat） was established by using an improved three-cuff anastomosis technique. The rats were divided into control group, CoPP （HO-1 inducer）-treated group and ZnPP （HO-1 inhibitor）-treated group. The severity of acute rejection was graded on the basis of the morphologic changes of the lung samples stained with HE. The expression of HO-1 protein in lung tissue was detected by using immunohistochemistry and Western blot, and HO-1 mRNA activity was assayed by RT-PCR. The results showed that the expression of HO-1 protein was significantly increased with the acute rejection grading in rats （P〈0.01）. As compared with control and ZnPP-treated groups, the severity of acute rejection was not alleviated and the grade not reduced significantly in CoPP-treated group （P〉0.05）. It was concluded that HO-1 protein might be involved in the pathological process of post-graft acute rejection. The expression of HO-1 protein was increased gradually with aggravation of acute rejection, and HO-1 protein might be used as an index to monitor acute rejection after lung transplantation.     

左向右分流容量负荷过重大鼠血红素氧化酶的表达及氯沙坦对其的影响

目的探讨容量负荷过重大鼠及氯沙坦治疗后肺动脉高压肺血管重建与血红素氧化酶(HO)mRNA表达水平的关系。方法行左向右分流术建立容量负荷过重SD大鼠模型并给予氯沙坦治疗,分别测定实验各组肺动脉压、右心室压等血流动力学指标;计算右心室相对重量;体视学方法测定肺小动脉厚度百分比和肌性化小动脉百分比;逆转录多聚酶链反应(RT-PCR)测定大鼠肺组织、左右心室HO-1、HO-2mRNA的表达。结果氯沙坦能显著减低肺动脉压力,使右心室相对重量降低,氯沙坦组肺小动脉厚度百分比和肌性化小动脉百分比均较手术组明显下降。手术组HO-1mRNA表达较对照组显著增高,而氯沙坦组HO-1mRNA表达水平较手术组明显降低,HO-2mRNA表达在三组间差异无统计学意义。结论氯沙坦能显著降低容量负荷过重大鼠的肺动脉高压,抑制肺血管重构程度,同时可下调HO-1mRNA的表达。HO-1参与了肺动脉高压形成、肺血管重构的病理过程。     

血红素加氧酶-1与一氧化碳在肺炎支原体感染患儿中的水平变化及其意义

目的 探索血红素加氧酶-1(HO-1)水平与一氧化碳(CO)水平在肺炎支原体感染患儿中的变化及临床意义.方法 选择该院2013年10月至2015年6月确诊并收治的219例肺炎支原体感染患儿为研究对象,根据急性期是否伴有喘息将其分为无喘息组(156例)和有喘息组(63例),而有喘息组患儿根据有无低氧血症而分为轻症喘息组(39例)和重症喘息组(24例).采用酶联免疫吸附法测定血HO-1水平,采用双波长分光光度法测定破氧血红蛋白百分比(COHb％),分析各组间差异.结果 有喘息组患儿血COHb比例2.59％士0.40％和HO-1水平(1 813.24士28.34)ng/L与无喘息组比较均有明显增加,组间差异有统计学意义(P＜0.05).重症喘息纽患儿COHb比例3.63％士0.45％和HO-1水平(2594.34±23.94)ng/L与轻症喘息组比较均有明显增加,组间差异有统计学意义(P＜0.05).血COHb比例和HO-1水平呈正相关(r=0.733,P＜0.05).结论 CO和HO-1可能参与肺炎支原体感染患儿喘息的发病过程,应引起临床的高度重视.     

Induction of heme oxygenase-1 in human hepatocytes to protect them from ethanol-induced cytotoxicity

We investigated the relationship between ethanol exposure and heme oxygenase (HO-1) in human hepatocytes in order to ascertain if induction of HO-1 can prevent ethanol induced cellular damage. Methods Dose-dependent (25-100 mmol/L) and time-dependent (0-24 h) ethanol exposure were used in the present study. HO-1 mRNA and protein expression were detected by PT-PCR and Western blot respectively. HO-1 activity was indicated by bilirubin and Fe^2 formation. Cytotoxicity was investigated by means of lactate dehydrogenate (LDH) and aspartate transaminase (AST) level in culture supematants, as well as the intracellular formation of malondialdehyde (MDA), cellular glutathione (GSH) status and CYP 2El activity. Results We first demonstrated a dose-dependent response between ethanol exposure and HO-1 mRNA and protein expression in human hepatocytes. We further observed a time-dependent increase of HO-1 mRNA expression using 100 mmol/L ethanol starting 30 minutes after ethanol exposure, reaching its maximum between 3 h and 9 h, Being similar to what had been demonstrated with the mRNA level,increased protein expression started at 6 h after ethanol exposure, and kept continuous elevated over 18 h. In addition, we found that ethanol exposure to hepatocytes markedly increased HO-1 enzyme activity in a time-dependent manner measured as bilirubin and Fez formation in human hepatocytes.Our results clearly showed that ethanol exposure caused a significant increase of LDH, AST, and MDA levels, while the antioxidant GSH was time-dependently reduced. Furthermore, we demonstrated that pre-administration of cobalt protoporphyrin (CoPP) induced HO-1 in human hepatocytes, and prevented an increase of MDA and a decrease of GSH. These effects could be partially reversed by zinc protoporphyfin (ZnPP), an antagonist of HO-1 induction. Conclusion HO-1 expression in cells or organs could lead to new strategies for better prevention and treatment of ethanol-induced oxidative damage in human liver.     

ＨＯ-１持续高表达对ＤＡ到Ｌｅｗｉｓ大鼠肝移植急性排斥反应的影响

目的:探讨血红素氧化酶-1(hemeoxygenage-1,HO-1)在DA到Lewis大鼠肝移植中对急性排斥反应的影响及其机制.方法:建立DA到Lewis大鼠肝移植急性排斥模型,实验分3组,各12对.A组供体术前24 h阴茎背静脉注射5ml/kg生理盐水作为对照;B组供体术前24 h阴茎背经脉注射HO-1诱导剂钴原卟啉(CoPP),C组供体给予HO-1抑制剂锌原卟啉(ZnPP),移植后持续予相同处理直至受体死亡.术后7天,各组处死6只,取外周血及肝脏标本,测定血清ALT,DBIL水平,组织病理观察排斥反应程度,RT-PCR及Western blot法测定移植物内HO-1 mRNA,Foxp3 mRNA及其蛋白表达情况,余观察生存期.结果:术后7天,B组血ALT,TBIL水平与A组,c组相比,差异有统计学意义(P＜0.01);病理示B组移植肝排斥反应程度轻于A,C组;B组HO-1和Foxp3 mRNA及其蛋白的表达均强于A,C组;B组受体存活时间(29.83±1.40)天较A组(13.00±0.52)天与C组(11.67±0.42)天显著延长(P＜0.01),而A,C组之间差异无统计学意义(P＞0.05).结论:诱导移植肝HO-1持续高表达,可通过促进移植物内Foxp3表达增强,发挥免疫抑制作用,减轻移植肝急性排斥反应.     

急性肺血栓栓塞症时血红素氧合酶-1 mRNA的表达

目的 观察急性肺血栓栓塞症时,血红素氧合酶-1(HO-1)mRNA的表达及变化.方法 健康成年雄性杂种犬24只,随机分为4组:对照组、肺栓塞3 h组、肺栓塞8 h组、肺栓塞24 h组.经右颈静脉置管注入自体血栓,股静脉置入Swan-Ganz监测血液动力学,采用半定量RT-PCR技术测定急性肺血栓栓塞症不同时相HO-1 mRNA的相对表达量.结果 急性肺血栓栓塞症3 h可见有HO-1 mRNA的表达并逐渐升高;犬肺动脉压在肺栓塞即刻显著升高,之后呈下降趋势.结论 急性栓塞性肺动脉高压HO-1 mRNA表达增多,HO-1 mRNA表达与肺动脉压呈负相关性.     

Protective effect of heme oxygenase-1 on lung injury induced

Background Intratracheal instillation of blood induces self-repaired acute lung injury. However, the mechanism of repair has been unclear. Heme-oxygenase （HO）-1, which catalyzes heme breakdown, acts as an inducible defense against oxidative stress and plays an important role in inflammation. The objective of this study was to test the role of HO-1 in lung injury caused by intratracheal instillation of red cells. Methods Forty healthy, male Sprague-Dawley rats were randomly divided into five groups： normal group, saline group, erythrocyte group, erythrocyte＋zinc-protoporphyrin （ZnPP, HO-1 inhibitor） group and saline＋ZnPP group. At 2 days after intratracheal instillation of red cells, lung tissues and lavage samples were isolated for biochemical determinations and histological measurements. Results Histological analysis revealed that administration of ZnPP worsened the acute lung injury induced by instilled erythrocytes. HO-1 was over-expressed in the erythrocyte group and in the erythrocyte ＋ ZnPP group. Compared with the erythrocyte ＋ ZnPP group, the levels of total protein, lactate dehydrogenase and tumor necrosis factor-a in the lavage were lower （P 〈0.01）, while the level of interleukin-10 was higher in the erythrocyte group （P 〈0.01）. Conclusion HO-1 protects against erythrocyte-induced inflammatory injury in lung.     

The Role of Endogenous Carbon Monoxide in the Hypoxic Vascular Remodeling of Rat Model of Hypoxic Pulmonary Hypertension

Itisknownthatpulmonaryvascularremodelingisthekeymechanisminthedevelopmentofchronicpulmonaryhypertension ,whichischaracterizedbythethicknessofthemediacausedbytheproliferationofsmoothmusclecellsandthemusculizationoftheintra acinarpulmonaryarteries[1] .Hemeoxygenase(HO)catalyzesthebreakdownofhemeintocarbonmonoxide (CO ) ,biliverdinandironinmammals .TherearetwoisoformsofHO ,HO 1andHO 2 [2 ] .HO 1istheinducibleisoformwhichcanbeinducedbyhyoxia ,shockandotherstresssettingsand pro duceCO .Itwasr…     

血红素加氧酶-1在大鼠原位肝移植急性排斥反应中的作用

目的 探讨血红素加氧酶-1(hemooxygenase-1,HO-1)在大鼠原位肝移植急性排斥反应中的作用.方法 建立大鼠原位肝移植排斥模型后分为3组:对照组(A组),ZnPP组(B组)和CoPP组(C组).3组分别于3、7 d处死,取血及肝脏标本.进行肝功测定(AST、ALT、TBIL、ALB);肝组织HE染色;荧光RT-PCR检测HO-1表达.结果 ①3组肝功能3、7 d时比较有明显的统计学意义(P＜0.05).②HE染色:A组3 d出现I、Ⅱ级为主的排斥反应,7 d时出现Ⅱ级为主的排斥反应;B组3 d出现Ⅱ级为主的排斥反应,7 d时出现Ⅱ、Ⅲ级为主的排斥反应;C组3 d出现排斥反应0～Ⅱ级,以I级为主,7 d时出现排斥反应0～Ⅱ级,以I、Ⅱ级为主.③HO-1在C组表达明显升高,B组不明显,A组介于两组之间.结论 血红素加氧酶-1(HO-1)过表达能减轻急性排斥反应.     

血红素氧合酶-1对大鼠心肌缺血-再灌注损伤的保护作用研究

目的探讨血红素氧合酶-1（HO-1）对大鼠心肌缺血-再推注损伤的效果及作用机制。方法采用HO-1的诱导剂钴原卟啉（CoPP）和抑制剂锌原卟啉（ZnPP）分别进行干预处理后,建立大鼠的心肌缺血-再灌注损伤模型,观察大鼠再灌注后心肌形态变化;检测血红素氧合酶-1基因在大鼠心肌的表达情况;测定大鼠左心室心肌组织超氧化物歧化酶（SOD）活性及丙二醛（MDA）含量。结果再灌注前使用CoPP进行预处理。可以诱导HO-1蛋白的表达上调。HO-1蛋自表达上调可以减少缺血-再灌注后的心肌细胞坏死,提高心肌组织中SOD含量并降低MDA的含量。结论CoPP诱导的HO-1过表达可以抑制心肌缺血-再灌注损伤后的细胞坏死,从而减轻心肌的再灌注损伤,其主要机制与抗氧自由基有关。