Effect of Heme Oxygenase-1 Inducer Hemin on Chronic Renal Failure Rats

The role of HO-1 inducer, hemin, in chronic renal failure (CRF) rats and its possible mechanism of action was studied. 5/6 subtotal nephrectomy was performed to establish chronic renal failure model. Rats were randomly assigned to 4 groups: sham-operated group, CRF group,ferrous gluconate group and heroin group. At the 10th week after operation, serum creatinine,BUN, RBC, HGB and HCT were measured. Renal pathologic changes were observed. RT-PCR and immunohistochemistry were used to detect the expression and distribution of HO-1. RT-PCR and radioimmunoassay was used to determine the expression of ET-1 in the kidney and plasma. The results showed that as compared with CRF group, serum creatinine and BUN in hemin group were reduced significantly and nephrogenic anemia was improved markedly. Glomerular mesangial proliferation and interstitial lesion were also ameliorated significantly. Heroin not only increased the expression of HO-1 but also reduced the expression of ET-1 in the kidney. The level of ET-1 protein in the plasma was also reduced after heroin treatment. Most of these indexes were not obviously changed in ferrous gluconate group. It was suggested that through inducing the expression of HO-1 and reducing the level of ET 1 in the kidney and plasma, heroin plays an important protective role in 5/6 subtotal nephrectomized rats.     

Hemin诱导大鼠肝脏HO-1表达对非酒精性脂肪性肝炎的保护作用

目的观察氯化血红素(hemin)对大鼠肝脏血红素加氧酶1(HO-1)表达的诱导作用,并探讨HO-1对大鼠非酒精性脂肪性肝炎(NASH)的保护作用。方法雄性SD大鼠随机分为对照组、模型组和干预组,每组8只。对照组给予正常饮食,模型组及干预组均给予髙脂饮食,共8周。之后对照组继续正常饮食喂养,模型组髙脂饮食喂养,干预组给予髙脂饮食及每日hemin 15 mg/kg腹腔注射,共10 d。第10天处死大鼠,观察肝脏组织形态学,检测各组血清丙二醛(MDA)和谷胱甘肽(GSH)、谷丙转氨酶(ALT)、谷草转氨酶(AST)水平,Western blot检测各组肝脏组织HO-1的表达。结果模型组MDA、AST、ALT较对照组显著升高(P<0.01),干预组MDA、AST、ALT较模型组显著降低(P<0.01);模型组GSH较对照组显著降低(P<0.01),干预组GSH较模型组显著升高(P<0.01);hemin干预组肝细胞肿胀、炎细胞浸润等形态学改变较模型组明显改善。Western blot结果显示:hemin干预组HO-1的表达明显高于模型组与对照组。结论 Hemin能够诱导大鼠肝脏组织HO-1表达的增加。通过增加HO-1的表达能够减轻大鼠肝脏氧化应激损伤,改善肝脏组织学及肝功能情况,对髙脂饮食引起的NASH起到保护作用。     

氯高铁血红素对早期糖尿病肾病大鼠肾脏的影响

目的:观察氯高铁血红素处理不同时期糖尿病大鼠肾脏结构和功能、核转录相关因子(Nrf-2)变化.方法:选取8周SD大鼠12只作为正常对照组(A组);对另36只SD大鼠采用高糖高脂联合链脲佐菌素法诱导建立糖尿病模型,建模后再分为糖尿病组(B组,n=17)和糖尿病+氯高铁血红素组(C组,n=17).检测8～14周大鼠体质量、血糖、24 h尿微量白蛋白,第10、14周提取大鼠肾组织匀浆,分析氧化应激产物丙二醛MDA含量,Western blotting检测肾脏HO-1、Nrf-2表达,PAS染色光镜下观察肾脏结构.结果:与正常对照组比较,B、C两组体质量均增高,而B组又显著高于C组(P<0.05).B、C两组血糖、24 h尿微量蛋白也显著高于正常对照组(P<0.05).不同时期比较显示,B、C组Nrf-2表达第14周均较第10周降低,C组Nrf-2均较B组升高(P<0.05),HO-1表达也呈现相同情况.MDA含量比较显示,第14周较第10周相比各组有显著升高;第10周时C组较B组低.结论:氯高铁血红素能改善早期糖尿病肾病大鼠肾脏结构和功能,并与抗氧化因子Nrf-2、HO-1表达有关.     

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.     

血红素氧合酶-1对人胃癌SGC7901细胞5-氟尿嘧啶化疗敏感性的影响

目的:体外观察血红素氧合酶-1(heme oxygenase-1,HO-1)对人胃癌细胞SGC7901 5-氟尿嘧啶(5-FU)化疗敏感性的影响及其可能的机制?方法:应用不同浓度锌原卟啉(ZnPP)?氯化血红素(Hemin)单独或联合5-FU作用于人胃癌SGC7901细胞不同时间,四甲基偶氮唑盐(MTT)法观察药物对细胞生长抑制作用;Western blot分析细胞HO-1蛋白表达变化;流式细胞术检测细胞凋亡率;活性氧(ROS)检测试剂盒分析其凋亡机制?结果:ZnPP和5-FU均可明显抑制人胃癌SGC7901细胞生长,呈剂量依赖性;5-FU联用ZnPP(10 μmol/L)与单用药相比,明显提高了细胞生长抑制率和凋亡率(P < 0.05),联用Hemin(10 μmol/L)则明显降低细胞生长抑制率和凋亡率(P < 0.05);人胃癌SGC7901细胞中可见HO-1表达,单用5-FU或Hemin后均能使其表达增强,联用ZnPP可逆转此现象;单用5-FU与对照组比较,细胞内ROS活性明显增高,联用后ZnPP可进一步提高细胞内ROS活性(P < 0.05),而联用Hemin明显降低细胞内ROS活性水平(P < 0.05)?结论:ZnPP抑制HO-1表达,能够增强人胃癌SGC7901细胞对5-FU化疗敏感性,这一作用可能与增加细胞内ROS活性有关?     

大鼠血红素加氧酶-1基因在乳酸乳球菌中的表达

目的:在乳酸乳球菌中表达大鼠血红素加氧酶-1(HO-1)基因。方法:采用RT-PCR技术从大鼠脾总RNA中分离扩增血红素加氧酶HO-1基因,将该基因克隆进pGEM-Teasy质粒中,转化大肠杆菌DH5α提取质粒,鉴定HO-1基因。酶切后与pSEC质粒连接,经电击转化,将重组质粒转入乳酸乳球菌NZ9000中,转化子在含有氯霉素的脑心浸液培养基上培养。用nisin诱导HO-1表达,SDS-PAGE、Westernblot鉴定表达产物,并采用分光光度法测定HO-1活性。结果:表达产物相对分子量约为32kU,表达量约为7.0mg/L,HO-1活性为2.386U/(mg·h)。结论:乳酸乳球菌能够表达具有生物活性的大鼠HO-1。     

血红素加氧酶-Ⅰ在大鼠肝硬化性肾损伤中的保护作用

目的探讨改变肝硬化大鼠肾中血红素加氧酶-1(heme oxygenase-1,HO-1)表达水平对肾的保护作用和可能的作用机制。方法将32只雄性SD大鼠随机分为4组:假手术组、肝硬化组、氯高铁血红素组和锌原卟啉组。胆总管结扎建立大鼠肝硬化模型,氯高铁血红素组胆总管结扎5周后隔日腹腔注射氯高铁血红素(30μmol/kg),锌原卟啉组胆总管结扎5周后隔日腹腔注射锌原卟啉(10μmol/kg)。4周后检测肾的各项生化指标,观察各组肾形态学改变,检测肾中HO-1的含量。结果肝硬化组血肌酐(serum creatinine,Scr)、胱抑素-C(cystatin C,Cys-C)、肌酐清除率(creatinine clearance rate,Ccr)水平分别为(44.52±3.31)μmol/L、(0.75±0.04)mg/L、(2.40±0.37)ml/min;氯高铁血红素组Scr、Cys-C、Ccr水平分别为(36.96±1.68)μmol/L、(0.50±0.03)mg/L、(3.40±0.62)ml/min;锌原卟啉组Scr、Cys-C、Ccr水平分别为(72.18±3.86)μmol/L、(0.91±0.05)mg/L、(1.03±0.30)ml/min。氯高铁血红素组Scr、Cys-C水平较肝硬化组明显降低(均P<0.01),而Ccr明显升高(P<0.01)。锌原卟啉组Scr、Cys-C水平较肝硬化组明显升高(均P<0.01),而Ccr明显降低(P<0.01)。且氯高铁血红素组肾组织病理明显改善。结论腹腔注射氯高铁血红素提高肝硬化大鼠肾中HO-1表达水平可以减轻肾损伤程度。     

低氧预处理对心脏成纤维细胞血红素氧化酶1基因表达的影响

目的：探讨离体培养的心脏成纤维细胞低氧预处理后血红紊氧化酶1（HO-1）mRNA的表达及其经时变化。方法：选用新生Wistar大鼠心脏进行成纤维细胞培养，给予低氧预处理（HPC）及低氧／复氧处理（H／R）。测定细胞培养上清液中乳酸脱氢酶（LDH）浓度。自处理后心脏成纤维细胞提取总RNA并进行逆转录扩增合成cDNA。应用即时定量PCR对HO-1mRNA进行定量分析。结果：HPC后HPC组LDH浓度未见显著升高；经过H／R后，H／R组LDH浓度显著高于HPC组（P〈0．01）。HPC后HO-1mRNA表达迅速增加，30min时达到高峰，此后逐渐下降，24h基本恢复到基线水平。结论：新生大鼠心脏成纤维细胞低氧预处理可减少低氧／复氧对细胞的损伤，低氧预处理后HO-1mRNA被显著诱导，并在12h内维持较高水平，24h后基本恢复至基线水平。     

Genotype and allele frequencies of heme oxygenase-1 promoter region in a Greek cohort

Background  Heme oxygenase-1 (HO-1) is an enzyme, which catabolizes heme into carbon monoxide, biliverdin and free iron. The induction of this enzyme is an important cytoprotective mechanism, which occurs as an adaptive and beneficial response to a wide variety of oxidant stimuli. HO-1 inducibility is mainly modulated by a (GT)_n polymorphism in the promoter region, and has been shown that short (S) repeats are associated with greater up-regulation of HO-1, compared with long (L) repeats.

Methods  In the present study, 250 healthy Greek individuals have been screened in order to estimate the frequencies of (GT)_n alleles in the HO-1 gene.

Results  Nineteen different alleles, ranging from 17 to 39 repeats, with (GT)₂₃ and (GT)₃₀ being the most common ones, were identified.

Conclusion  The possible role of this polymorphism in disease states is discussed.

     

血红素加氧酶-1在高氧肺损伤小鼠中的表达及作用

目的 探讨血红素加氧酶-1(HO-1)在高氧造成的肺损伤转基因小鼠和正常小鼠中的肺部表达水平及其作用.方法 把32只新生小鼠分成4组:野生型组(WT组),特异性转基因小鼠全身高水平表达HO-1组[HO-1-FL(H)组,细胞质]、特异性转基因小鼠全身低水平表达HO-1组[HO-1-FL(L)组,细胞质]和切去C末端HO-1(Nuc-HO-1-TR组,细胞核).把4组小鼠暴露在高氧环境中3d,然后放到正常空气环境中,通过免疫组织化学、免疫荧光等实验技术来观察小鼠3d、7d和14 d肺泡发育情况及HO-1在小鼠肺部表达情况.结果 HO-1在HO-1-FL(H)组小鼠肺部高表达,高氧暴露3d后4组小鼠肺部肺泡发育都受到了损害,在正常空气环境中7、14 d时HO-1-FL(H)组小鼠的肺泡发育恢复得最好.结论 小鼠肺部适度高水平的HO-1表达有助于高氧环境造成的小鼠肺损伤的恢复.     

葛根素对兔肺缺血再灌注损伤中血红素加氧酶-1的影响

目的:观察葛根素对兔肺缺血再灌注损伤(IRI)中血红素加氧酶-1(HO-1)的影响.方法:30只健康日本大耳白兔随机分成假手术对照组(C组)、肺缺血再灌注组(IR组)和葛根素组(Pur组).复制兔单侧肺缺血再灌注损伤模型,对比观察各组肺湿干重比(W/D)、肺泡损伤数(IAR)、HO-1活性、HO-1mRNA及其蛋白的表达.结果:IR组与Pur组W/D、IQA均比C组为高(P＜0.01),但Pur组显著低于IR组(P＜0.01);与C组相比,IR组HO-1活性、HO-1mRNA及其蛋白表达增加(P＜0.01),Pur组上升更加显著(P＜0.01).结论:葛根素能增加HO-1的活性,上调HO-1mRNA及其蛋白的表达,对肺缺血再灌注损伤有明显的保护作用.     

姜黄素诱导HO-1表达对大鼠动脉粥样硬化的影响

目的探讨姜黄素能否诱导大鼠主动脉血红蛋白氧合酶-1(HO-1)高表达,以及诱导HO-1高表达能否有效发挥内源性抗动脉粥样硬化(AS)作用。方法以健康雄性Wistar大鼠38只,随机分为正常对照组(n=8只)、模型组(n=14只)、姜黄素组(n=8只)及抑制组(n=8只),模型组、姜黄素组、抑制组同法复制AS模型,姜黄素组加用姜黄素,抑制组加用姜黄素及锌原卟啉Ⅸ。于6、10及14周末分别随机处死模型组大鼠2只以了解AS形成程度。第14周末处死所有大鼠取降主动脉观察病理学变化,同时行主动脉内HO-1表达、分布情况及活力测定。结果 (1)姜黄素组HO-1表达及活力均显著高于模型组(P<0.05),AS程度明显轻于模型组。(2)抑制组HO-1表达及活力均明显低于姜黄素组(P<0.05),AS程度较姜黄素组加重。结论姜黄素可显著诱导HO-1表达并增加其活力进而发挥抗AS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…     

HO-1抗大鼠肾缺血/再灌注损伤的实验研究

目的探讨诱导血红素氧合酶-1(HO-1)表达能否减轻随后的肾缺血/再灌注损伤(IRI)及其可能的机制。方法采用切除右肾,夹闭左肾动脉50min/再灌注24h的动物模型,30只雄性Wistar大鼠随机均分为3组:假手术组,缺血/再灌注(I/R)组,血晶素处理组(皮下注射血晶素30mg/(kg·d),连续2d),检测肾组织中HO-1蛋白表达及HO-1活力、丙二醛(MDA)含量、总抗氧化能力(TAOC)和血清肌酐(Cr)、尿素氮(BUN)含量及组织形态学改变。结果血晶素明显诱导了肾内HO-1表达并使其活力增加,与I/R组比较,P<0.01;与假手术组比较,I/R组Cr,BUN,MDA升高(P<0.05),TAOC降低(P<0.05),组织学损伤严重。在I/R前血晶素诱导HO-1表达可逆转上述病理改变(P<0.05)。结论肾内HO-1的诱导表达可明显改善大鼠随后的I/R性肾损伤,作用机制与其增强机体抗氧化能力有关。     

活化T细胞及IFN-γ对间充质干细胞中血红素加氧酶-1抗凋亡作用的影响

目的 探讨免疫活性细胞和免疫调节因子对骨髓间充质干细胞(mesenchymal stem cells,MSCs)中血红素加氧酶-1(HO-1)的影响.方法 体外培养人骨髓间充质干细胞,在IFN-γ及PHA活化的T细胞刺激下,应用RT-PCR方法检测HO-1 mRNA的表达情况.应用流式细胞术分析细胞凋亡情况.结果 正常骨髓间充质干细胞中HO-1 mRNA在IFN-γ及活化的T细胞刺激后表达下调.流式细胞术结果显示,在IFN-γ锌原卟啉-Ⅸ(Znpp-Ⅸ)、IFN-γ+Znpp-Ⅸ的刺激下,间充质干细胞出现明显的凋亡,凋亡率分别为(56.50±0.16)%、(56.85±2.27)%、(82.53±2.65)%,较正常MSCs组显著增高[(7.56±1.43)%,P<0.05].结论 免疫活性细胞及免疫调节因子使骨髓间充质干细胞中HO-1 mRNA表达下凋,进而促进MSCs凋亡.     

诱导血红素氧合酶-1对小肠移植缺血再灌注损伤的影响

目的：探讨诱导血红素氧合酶-1（HO-1）是否可减轻大鼠小肠移植缺血再灌注损伤及其机制。方法：SD大鼠分成3组：Ⅰ组：血晶素（Hemin）组（n=20）；Ⅱ组：Hemin＋卟啉锌（ZnPP）组（n=20）；Ⅲ组：生理盐水组（n=20）。建立小肠移植缺血再灌注损伤模型。移植后6、12、24、48h分别从各组随机取5只大鼠，切取移植小肠进行HO-1活性测定．普通病理学检查及细胞凋亡检测。结果：术后各时段Ⅰ组HO-1活性均显著强于Ⅱ组及Ⅲ组（P〈0．05），而Ⅱ组和Ⅲ组比较无显著差异（P〉0．05）。各组移植肠缺血再灌注损伤以术后12h最为明显。Ⅰ组表现轻度，而Ⅱ组和Ⅲ组表现中度缺血再灌注损伤。术后各时段Ⅰ组细胞凋亡数少于Ⅱ组和Ⅲ组，差别有统计学意义（P〈0．05），而Ⅱ组和Ⅲ组比较无统计学意义（P〉0．05）。结论：诱导HO-1可通过抑制细胞凋亡而减轻移植肠缺血再灌注损伤。     

Shorter GT repeats in the heme oxygenase-1 gene promoter are associated with a lower severity score in coronary artery disease

BackgroundThe glutathione thymidine repeats [(GT)_n] of the heme oxygenase (HO)-1 gene promoter have been shown to be correlated with the incidence of coronary artery disease (CAD), patients with shorter repeats being less likely to have CAD. In this study, we investigated whether (GT)_n repeats in the HO-1 promoter were related to a quantitative angiographic severity of CAD.MethodsThe allele frequency of the HO-1 gene promoter (GT)_n repeats was examined in CAD patients with de novo lesions (n = 328). Patients' baseline coronary severity was quantified using the Jeopardy scoring system.ResultsThe allele frequency of GT repeats in the HO-1 gene promoter had bimodal peaks at (GT)₂₃ and (GT)_30. Therefore, we defined allele classes as follows: S allele (<23 repeats), M allele (23–29 repeats), and L allele (≥30 repeats). The group with severe CAD (Jeopardy score ≥8) had a significantly lower frequency of the S allele (3.7% vs. 8.9%; p = 0.042) than the group with moderate CAD (Jeopardy score <8). None of the patient with the highest score of 12 (n = 17) carried the class S allele. In a multivariate binary logistic analysis, being a carrier of shorter GT repeats was a significant negative predictor (odds ratio 0.393; p = 0.024) of a higher Jeopardy score grade of CAD.ConclusionOur study showed that shorter (GT)_n repeat in the HO-1 gene promoter were associated with a lower Jeopardy severity score in patients with significant CAD.     

染料木黄酮通过上调血红素氧合酶-1表达减缓野百合碱诱导的大鼠肺动脉高压

目的研究染料木黄酮对野百合碱诱导的肺动脉高压大鼠肺组织血红素氧合酶-1(HO-1)表达的影响,探讨其减缓肺动脉高压的机制。方法 60只雄性SD大鼠随机分成对照组、野百合碱组、小剂量染料木黄酮治疗组和大剂量染料木黄酮治疗组。监测血流动力学变化,通过电子显微镜观察肺小动脉结构重塑,Western blotting检测肺组织HO-1的表达。结果染料木黄酮治疗组较野百合碱组大鼠平均肺动脉压降低(P<0.01),右心肥厚指数下调(P<0.01),大剂量组更显著(P<0.01)。染料木黄酮治疗组较野百合碱组大鼠肺组织HO-1表达上调(P<0.01),大剂量组更显著(P<0.01)。结论染料木黄酮能减缓野百合碱诱导的大鼠肺动脉高压,可能与其上调大鼠肺组织HO-1表达有关。     

肺缺血再灌注损伤时血红素氧合酶-1的变化及意义

目的:探讨肺缺血再灌注损伤时血红素氧舍酶-1(HO-1)的变化规律及意义.方法:40只健康日本大耳白兔随机分成假手术对照(C)组、肺缺血再灌注(IR)组、肺缺血再灌注 氯铁血红素(H)组和肺缺血再灌注 锌原卟啉(Z)组.各组在缺血前后,再灌注1 h、2 h、3 h分别抽血检测一氧化碳血红蛋白(COHb)浓度,实验结束时取肺组织测湿/干重比(W/D)、肺泡损伤数(IAR)、HO酶活力并观察细胞超微结构的改变.结果:与C组相比,IR组COHb浓度随缺血和再灌注时间的延长而逐渐升高,H组这种趋势更加明显,Z组升高较缓和;IR组W/D、IAR升高,H组下降而Z组明显增加;IR组HO酶活力增加,H组上升更加显著而Z组明显降低;超微结构显示H组较IR组损伤减轻而Z组加重.结论:HO-1诱导可能通过一氧化碳(CO)介导减轻肺缺血再灌注损伤.