HO-1激动剂Copp对放射所致内皮细胞凋亡的抑制作用

目的探讨血红素加氧酶1(HO-1)在放射所致内皮细胞凋亡中的作用。方法预先通过HO-1激动剂Copp和(或)HO-1抑制剂Znpp分别处理人血管内皮细胞EA.hy926。然后,预处理后的部分细胞接受8 Gy的照射。分别通过Western blotting和流式细胞仪检测EA.hy926细胞HO-1蛋白、细胞色素C的表达以及EA.hy926细胞的凋亡率。结果PBS R组EA.hy926细胞经8 Gy照射后低表达HO-1蛋白;而细胞先经Copp和(或)Znpp处理后,再行8 Gy照射,其HO-1蛋白的表达则显著增高(P<0.01)。与Znpp R组相比,Copp R组的增高较为明显(P<0.01);另外,Copp R组HO-1蛋白的表达低于Copp Znpp R组(P<0.01)。进一步通过流式检测各组细胞凋亡的情况显示,与其他各组相比,Copp R组细胞的凋亡率最低(P<0.01),这与相应各组细胞细胞色素C的表达水平结果一致。结论诱导并激活HO-1能够减少放射所致的内皮细胞凋亡。     

血红素氧合酶-1对大鼠脑外伤后细胞凋亡的影响

目的探讨血红素氧合酶-1(HO-1)对大鼠颅脑外伤后细胞凋亡的作用。方法 72只成年雄性SD大鼠,随机分为血晶素组、生理盐水组和锌原卟啉组。采用液压冲击伤复制颅脑外伤的动物模型,伤后予以45mg/100mg体质量腹腔注射诱导剂血晶素、抑制剂锌原卟啉、生理盐水干预HO-1的表达。SP免疫组织化学法测定HO-1和抗凋亡蛋白(Bcl-2)的表达以及TUNEL法检测凋亡细胞。结果血晶素组HO-1表达较生理盐水组和锌原卟啉组显著增加(P<0.01)。血晶素组Bcl-2表达较生理盐水组和锌原卟啉组显著增加(P<0.01)。同时,血晶素组凋亡指数较生理盐水组和锌原卟啉组显著降低(P<0.01)。结论 HO-1在颅脑外伤中的表达,具有上调Bcl-2的表达,抗细胞凋亡的作用。     

HO-1对肝硬化导致的糖代谢紊乱的影响及机制初探

目的 探讨血红素加氧酶-1（HO-1）对肝硬化导致的糖代谢紊乱的影响及机制。方法 50只雄性SD大鼠随机分4组:假手术组、肝硬化组、锌原卟啉-IX（ZnPP-IX）组、氯高铁血红素（Hemin）组。除假手术组外,其余3组造肝硬化模型,于造模成功后,向ZnPP-IX组大鼠隔日一次（qod)腹腔注射ZnPP-IX 10 μmol/kg,Hemin组大鼠同时点腹腔注射Hemin 30 μmol/kg,肝硬化组和假手术组大鼠同时点腹腔注射等量生理盐水,共干预4周。于4周末做葡萄糖耐量实验,测各组糖代谢相关指标。采用免疫组化和Western blot检测HO-1蛋白在肝组织中的表达情况。结果 肝硬化组大鼠肝组织HO-1蛋白表达高于假手术组和ZnPP-IX组（P<0.05）,低于Hemin组（P<0.05）。各组间空腹血糖（FPG）差异无统计学意义（P>0.05）。与假手术组比,肝硬化组大鼠2 h血糖（PPG）、空腹胰岛素（FINS）、2 h胰岛素（PINS）、胰岛素抵抗指数（HOMA-IR）均增高（P均＜0.05）,胰岛素敏感指数（ISI）则降低（P<0.05）。ZnPP-IX组较肝硬化组PPG、FINS、PINS、HOMA-IR进一步增高（P均＜0.05）,ISI进一步降低（P<0.05）。Hemin组相比肝硬化组各指标变化与ZnPP-IX组相反（P均＜0.05）。结论 提高HO-1在肝脏的表达能改善肝硬化大鼠的糖代谢紊乱,其作用机制可能与HO-1代谢产物所具备的保护作用有关。     

血红素加氧酶-1的表达对氟尿嘧啶诱导食管癌细胞凋亡的影响

目的 本研究探讨血红素加氧酶-1与氟尿嘧啶诱导食管癌细胞凋亡的关系。 方法 培养ECa109食管鳞癌细胞,实验组分别加入正常培养基,含20μmol/L、80μmol/L锌原卟啉(ZnppIX)的培养基培养12h,后更换为含100μg/ml 5-FU组培养;对照组予正常培养基培养;共培养96h后检测各组细胞凋亡情况。 结果 在凋亡早期细胞中(Annexin V⁺/PI^-),20μmol/L ZnppIX组(25.63%±6.52%)及80μmol/L ZnppIX(22.48%±5.59%)组显著高于5-FU组(12.89%±4.42%,P均<0.05)。在中晚期凋亡细胞(Annexin V⁺/PI⁺)中,20μmol/L ZnppIX组(25.17%±5.53%)显著低于5-FU组(39.89%±6.66%)及80μmol/L ZnppIX组(41.95%±2.92%,P均<0.01)。80μmol/L ZnppIX组caspase-3的活化率显著高于正常细胞(P<0.05)。 结论 ZnppIX抑制HO-1表达后,可以显著增加5-FU诱导的Eca109食管癌细胞凋亡率,caspase-3参与了其诱导细胞凋亡的过程。     

HO-1在大鼠异位心脏移植急性排斥期的表达研究

目的:观察血红素加氧酶1(HO-1)mRNA在大鼠异位心脏移植急性排斥期中的表达及意义。方法:建立大鼠腹部心脏异位移植模型,分对照组及环孢菌素(CSA)组,每组32只。分别灌胃给予生理盐水及CsA干预,每组8只用于观察移植心存活时间,术后1,3,5,7d各6只动态切取标本,常规组织切片监测排斥反应,TUNEL法检测心肌细胞凋亡,RT-PCR检测移植心肌组织HO-1 mRNA的表达。结果:CSA组移植心存活时间(15.4±5.1)d长于对照组(7.6±1.5)d,P<0.01;CSA组各采样时段的心肌凋亡指数明显低于对照组,而HO-1表达强度均强于对照组。结论:移植心脏中HO-1表达水平的高低与心脏移植免疫排斥反应的轻重存在一定的相关性,CSA干预增强HO-1表达,减轻免疫排斥反应及降低凋亡指数。提示HO-1在心脏移植术后应激及急性免疫排斥反应抑制中起着重要的作用。     

TNFα诱导血管内皮细胞HO-1基因表达的受体及细胞内信号机制

目的探讨肿瘤坏死因子(TNFα)对脑微血管内皮细胞(BMVEC)HO-1基因表达的信号转导机制。方法采用TNF受体1敲除的脑血管内皮细胞[BVEC/TNF-RI(-/-)]为研究对象,用RT-PCR法测定TNFα刺激细胞24h后HO-1基因mRNA的表达,用westernblot法检测TNFα对JNK、ERK激酶和转录因子AP-1活性的影响,并用JNK或ERK抑制剂干预上述诱导实验。结果TNFα刺激BVEC/TNF-RI(-/-)HO-1表达增高(P<0.05),此外,TNFα刺激BVEC/TNF-RI(-/-)可引起JNK和ERK激酶表达和转录因子AP-1的活性增强(P<0.05),可是JNK的抑制剂SP600125能减弱TNF诱导的HO-1的表达(P<0.05),而ERK的抑制剂不能。结论TNFR2和JNK激酶对于TNFα诱导的HO-1的表达有重要作用。     

HO-1对肺气肿大鼠ICAM-1、MIP-2表达的影响

目的 观察HO-1对肺气肿大鼠模型肺组织ICAM-1和MIP-2表达的影响.方法 复制肺气肿大鼠模型,并用Hemin干预,收集BALF行细胞计数并分类检查;采用免疫组织化法检测大鼠支气管肺组织HO-1、ICAM-1表达,ELISA方法检测肺组织匀浆中MIP-2的含量.结果 与模型组比较,干预组肺组织中HO-1表达显著增加（P＜0.05）.肺气肿组大鼠模型中不仅ICAM-1在支气管肺组织的表达较干预组显著增加（P＜0.05）,而且BALF中的白细胞计数和中性粒细胞计数均与ICAM-1表达呈显著正相关（r=0.85、0.84,P均＜0.01）;模型组肺组织匀浆中MIP-2含量较干预组明显增加,而且BALF中的白细胞计数和中性粒细胞计数均与MIP-2含量呈显著正相关（r=0.89、0.89,P均＜0.01）.结论 ICAM-1和MIP-2在肺气肿中明显增加,HO-1可降低ICAM-1、MIP-2的表达,这可能是HO-1在肺气肿中抗炎反应的作用机制之一.     

丝胶对2 型糖尿病大鼠海马HO-1 表达的影响

 目的探讨丝胶对2 型糖尿病大鼠海马血红素加氧酶1（HO-1）表达的影响。方法30 只雄性SD 大鼠随机分为正常对
照组、糖尿病模型组和丝胶治疗组,每组10 只。糖尿病模型组和丝胶治疗组大鼠均采用链脲佐菌素连续腹腔注射建立2 型糖尿
病大鼠模型,以血糖逸16.7 mmol/L 作为成模标准。待模型成功建立后,模型组大鼠不再作任何处理,丝胶治疗组大鼠给予丝胶
（2.4 g·kg^-1·d^-1）灌胃35 d。HE 染色观察海马的形态变化;分别采用Western blot 和RT-PCR 法检测海马HO-1 蛋白及mRNA的
表达。结果糖尿病模型组大鼠海马CA1 区神经细胞出现明显的病理变化,HO-1 蛋白及mRNA的表达明显高于正常对照组
大鼠（ P<0.01）。丝胶治疗组大鼠海马CA1 区神经细胞的病理变化明显减轻,HO-1 蛋白及mRNA的表达明显低于模型组大鼠
（ P<0.01, P<0.05）。结论丝胶可通过下调海马HO-1 的表达,减轻糖尿病时HO-1 高表达对海马神经细胞的毒性损害,发挥
对糖尿病神经系统损伤的保护作用。     

HO-1对抗汞引起的肾细胞凋亡

目的探讨血红素氧合酶-1(HO-1)对汞引起肾细胞凋亡的影响及其可能的机制。方法64只雄性Wistar大鼠随机分为对照组、单纯染汞组、HO-1诱导组和HO-1抑制组,每组16只。先分别腹腔注射生理盐水、空白液、血晶素、锌原卟啉Ⅸ(ZnPPⅨ)预处理,8 h后处死各组内半数鼠取肾查HO-1表达水平,余鼠除对照组注射生理盐水外,其余3组均腹腔注射HgCl2(2 mg.kg-1),24 h后检测血肌酐(Cr)、尿素氮(BUN)及肾内总抗氧化能力(TAOC)、丙二醛(MDA)、Bcl-2蛋白表达水平与细胞凋亡指数(AI)。结果与对照组比较,单纯染汞组TAOC降低而MDA、Cr、BUN、Bcl-2表达水平和AI均明显增加(P<0.01),HO-1抑制组除Bcl-2表达受抑外,其余指标的变化与单纯染汞组相似,但更为显著。HO-1诱导组与单纯染汞组及HO-1抑制组比较,TAOC及Bcl-2表达均显著升高,而MDA、Cr、BUN及AI则明显降低(均P<0.01)。结论HO-1通过抗氧化、上调Bcl-2蛋白表达水平而对抗汞引起的肾细胞凋亡作用。     

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。     

Heme oxygenase-1 promotes Caco-2 cell proliferation and migration by targeting CTNND1

Background Heme oxygenase-1 （HO-1） can be induced by inflammatory cytokines,oxidation,ischemia,hypoxia,and endotoxins.As a ＂graft survival protective gene,＂ HO-1 is a hot spot in organ transplantation research.However,the role of HO-1 gene expression in the function of human colon adenocarcinoma cell line （Caco-2） cells has not been reported previously.Methods The role of HO-1 in the proliferation and migration of Caco-2 cells was analyzed using a stable HO-1 expression plasmid.We constructed a recombinant adeno-associated virus plasmid containing the HO-1 gene,heme oxygenase 1 （HMOX1）,which was transfected into Caco-2 intestinal cells.We identified a number of target genes by global microarray analysis combined with real-time polymerase chain reaction （PCR） and chromatin immunoprecipitation assay.Results Our results showed that significant HO-1 upregulation was demonstrated in the Caco-2 cells after HO-1 transfection.Restoration of HO-1 expression promoted proliferation and invasion in vitro.The CTNND1 gene,a member of the armadillo protein family,was identified as a direct HO-1 target gene.Conclusion Overexpression of HO-1 promotes Caco-2 cell proliferation and migration by targeting the CTNND1 gene.     

血红素氧合酶-1与中枢神经系统疾病

血红素氧合酶-1(heme oxygenase-1,HO-1)是血红素降解的起始酶和限速酶,可被氧化应激、化学物质和药物等诱导激活,通过抗氧化、抗炎和抗凋亡机制发挥细胞保护作用。多种中枢神经系统(central nervous system,CNS)疾病均可引起HO-1表达变化,该酶的异常涉及到多种CNS疾病。文中就HO-1的生物学特性和在不同神经系统疾病中的表达、作用作简要综述。     

Inhibition of microvascular endothelial cell apoptosis by angiopoietin-1 and the involvement of cytochrome C

Background Angiopoietin-1 （Ang-1） is an endothelial-specific growth factor that can promote angiogenesis. Studies demonstrated that Ang-1 can inhibit apoptosis of umbilical endothelial cells, but so far little is known about its effects on apoptosis of microvascular endothelial cells. With the apoptotic model of murine- cerebral-derived microvascular endothelial cells （bEnd.3） induced by serum-free culture,we attempted to clarify the molecular mechanism of bEnd.3 apoptosis, particularly its relation to cytochrome C （Cyt C）. Methods The cultured microvascular endothelial cell strain, bEnd.3 cell, was employed. An apoptotic model of bEnd.3 was established by serum-free culture. Flow cytometry after Annexin labeling and PI staining were used to assess the apoptotic effects of Ang-1 on bEnd.3, and the expression of Bax/Bcl-2, caspase 8, caspase 3, and Cyt C were detected with Western blotting and ELISA. Results The apoptotic rate of bEnd.3 cells after stimulation with Ang-1 （100 ng/L） in serum-free medium was significantly higher than that in control group. Ang-1 inhibited early-stage apoptosis more than late-stage apoptosis provided by propidium iodide （PI） and AnnexinV double staining. The inhibition of Ang-1 on bEnd.3 cell apoptosis was strengthened with the increase in concentration （0-400 ng/ml）. Ang-1 could decrease the expression of Bax, caspase3 and 8, and increase that of Bcl-2. The results of ELISA indicated that Ang-1 significantly decreased CytC content in cytoplasm and increase that in mitochondria. Conclusions Ang-1 could inhibit bEnd.3 apoptosis induced by serum-free medium culture. The apoptosis was associated with decreased Bax expression, increased Bcl-2 expression, which result in Cyt C transferring from mitochondria to cytoplasm, and then caspases activation are reduced and cell apoptosis is suppressed.     

血红素氧合酶-1基因转染是器官移植新的研究靶点

血红素是一种对机体有潜在危害的物质,尤其是在机体发生缺血再灌注损伤时[1]。血红素氧合酶-1（HO-1）是降解血红素为胆红素、CO和Fe 2+过程的限速酶[2]。移植物HO-1表达增高可以清除血红素改善缺血再灌注损伤,更为重要的是其代谢产物的生物学活性。研究显示基因转染方式可以促进HO-1稳定过表达,能显著减轻移植器官的缺血再灌注损伤（ischemia/reperfusioninjury,IRI）,提高移植物存活率。     

血红素加氧酶1在恶性梗阻性黄疸患者小肠黏膜氧化应激损伤中的作用

目的 探讨血红素加氧酶1(HO-1)在恶性梗阻性黄疸(MOJ)患者小肠黏膜表达及其在氧化应激损伤中的作用.方法 采用前瞻性研究,收集行内镜下逆行胰胆管造影(ERCP)检查或治疗的恶性胆道梗阻伴黄疸患者15例,恶性胆道梗阻无黄疸患者10例;并以健康体检胃镜检查者10名作为对照组.取十二指肠乳头以下2～5 cm肠黏膜组织,应用比色法检测组织丙二醛含量和超氧化物歧化酶(SOD)活性,原位缺口末端标记法(TUNEL)检测细胞凋亡.应用免疫组织化学和蛋白质印迹方法检测小肠黏膜组织HO-1分布及表达变化.结果 MOJ伴黄疸患者肠黏膜脂质过氧化产物丙二醛水平(nmol·mg~(-1)·prot~(-1))明显高于无黄疸组和健康对照组(1.79±0.24比1.09±0.28、1.18±0.32,P=0.041);SOD活力(nmol·mg~(-1)·prot~(-1)则明显低(303±10比398±11、406±11,P=0.017);肠上皮细胞凋亡率(%)高(69.1±5.9比28.6±3.5、10.2±2.5,P<0.01).MOJ患者小肠黏膜HO-1阳性表达为细胞核及细胞质呈棕黄色;伴黄疸组小肠黏膜HO-1表达(0.28±0.04)明显高于无黄疸组(0.20±0.04,P<0.01)和健康对照组(0.13±0.05,P<0.01).蛋白质印迹显示伴黄疸组患者小肠黏膜HO-1蛋白表达(%)明显高于其他两组(10.7±0.7比7.6±0.5和3.9±0.4,P<0.01).结论 MOJ患者小肠上皮细胞存在氧化应激损伤,HO-1蛋白表达随着胆道梗阻的进展明显升高,这可能是减轻肠黏膜损伤的一种保护性反应.     

Heme oxygenase-1 is the candidate targeting for organ transplantation

Objective To review the role of heme oxyenase-1 in organ transplantation and explore the potential applications targeted on overexpression of heme oxyenase-1 gene.Data sources The data cited in this review were mainly obtained from the articles listed in Medline and PubMed,published from January 1996 to December 2008.The search terms were ＂heme oxygenase-1＂ and ＂transplantation＂.Study selection Articles regarding the role of heme oxyenase-1 in organ transplantation and its protective role in transplants were selected.Protective effects of heme oxygenase-1 overexpression using a gene transfer approach against ischaemic reperfusion injury during transplantation were widely explored.Results Local heme oxygenase-1 overexpression in the graft ameliorates the ischaemic reperfusion injury.This is due to removal of heme, a potent prooxidant and proinflammatory agent, but also because of generation of biologically active products.Conclusions Overexpressive heme oxygenase-1 activity is associated with tissue protection in the setting of graft,ischaemic reperfusion injury.Gene therapy is attractive to us; but a long way from general application.In terms of heme oxygenase-1, the gene promoters are polymorphic.Although individualization is an important principle during clinical application, it is difficult to put into practice.     

辐射诱导pcDNA3.1-Egr.1p-p16对JF305细胞周期和凋亡的影响

目的 检测pcDNA3.1-Egr.1p-p16质粒对胰腺癌细胞JF305凋亡和细胞周期变化的影响.方法 进行人胰腺癌JF305细胞培养,脂质体LipofectamineTM000转染pcDNA3.1-Egr.1p-p16重组质粒,6MV-X射线4 Gy照射(剂量率2.50 Gy/min),流式细胞术检测细胞周期和细胞凋亡状况.结果 pcDNA3.1-Egr.1p-p16质粒转染组和pcDNA3.1-Egr.1p-p16质粒转染 4 Gy照射组的JF305细胞中早期凋亡细胞分别占6.4%、10.4%,晚期凋亡或继发性死亡细胞分别占16.8%、33.8%,均较阴性对照组显著升高(P＜0.05).质粒转染 4Gy照射组总的凋亡率高于单纯质粒转染组(P＜0.05).辐射明显导致JF-305细胞G2期阻滞.pcDNA3.1-p16质粒和pcDNA3.1-Egr.1p-p16质粒基因转染,可使JF-305细胞阻滞于G1期.当给予细胞4 Gy照射后,两质粒转染组,阻滞于G1期细胞变化不大,阻滞于G2期的细胞有所增加.结论 pcDNA3.1-Egr.1p-p16可致JF-305细胞凋亡,与放射联合增加了细胞凋亡率.转染pcDNA3.1-Egr.1p-p16可使细胞阻滞于G1期,联合辐射,增加了细胞的G2期阻滞.     

Heme oxygenase-1 polymorphism associated with severity of chronic obstructive pulmonary disease

Background Recent studies have suggested that susceptibility to chronic obstructive pulmonary disease （COPD） might be related to the length polymorphism of （GT）n repeat in the 5＇-flanking region of heme oxygenase-1 （HOX-1） gene. However, there has been no research about the relationship between the polymorphism of HOX-1 gene and severity of COPD. Methods The polymorphism of HOX-1 gene in 452 patients with COPD from Han population in Southwest China was analysed by fragment analysis. The frequencies of the HOX-1 genotype were compared with the stage of COPD of each patient. Results The HOX-1 genotypes were classified into two groups： group I were individuals with class L allele （the number of GT 〉32 repeats）, and group II were those without class L allele （the number of GT 〈32 repeats）. The genotypic frequency of the HOX-1 group I was significantly higher than group II in the very severe COPD patients （36.8% vs 22.4%, P〈0.01, OR=2.0, 95% CI 1.3-3.1）, while the genotypic frequency of the HOX-1 group II was lower in the mild COPD （16.0% vs 26.0%, P=-0.02, OR=0.5, 95% CI 0.3-0.9）. However, in moderate and severe stages COPD, there were similar genotypic frequencies between HOX-1 group Ⅰ and group Ⅱ. Conclusions Genetic polymorphism in HOX-1 is associated with the severity of COPD in Southwest China. COPD patients with class L allele may be susceptible to develop very severe COPD. Conversely, the COPD patients without class L allele may be more easily stabilized on mild COPD.