热休克蛋白72重组腺病毒包装及其对细胞凋亡的影响

目的 包装热休克蛋白72重组腺病毒表达载体,探讨其对ECV304细胞凋亡的影响.方法采用细菌同源重组法构建了热休克蛋白72重组腺病毒表达载体;流式细胞仪检测重组腺病毒对细胞凋亡的影响;荧光报告系统和蛋白印迹分析重组腺病毒对p53转录的调节和蛋白表达的影响.结果 成功包装了热休克蛋白72重组腺病毒,热休克蛋白72能够促进细胞凋亡,从转录水平上调p53蛋白的表达.结论 热休克蛋白72可能通过上调p53蛋白的表达促进细胞凋亡.     

过表达HSP20的慢病毒载体对H2O2诱导的大鼠心肌细胞凋亡的影响

目的构建过表达大鼠热休克蛋白20(HSP20)基因慢病毒载体,探讨其对H2O2诱导的大鼠H9C2心肌细胞凋亡的影响。方法构建大鼠HSP20基因pHIV-HSP20过表达质粒慢病毒,与包装质粒psPAX2、pMD2G共转染293FT细胞,检测其转染效率;包装慢病毒并转染H9C2心肌细胞;72 h后观察其转染效率,RT-PCR法检测细胞HSP20 mRNA表达,CCK-8、Hochest33258染色法检测H2O2诱导后H9C2心肌细胞凋亡情况。结果成功构建了HSP20慢病毒过表达载体,经293FT细胞包装后,其对H9C2细胞72 h的转染效率为95%;与慢性病毒组比较,H9C2细胞转染72 h后HSP20 mRNA水平显著升高,细胞活力下降,心肌细胞凋亡率明显降低(P均<0.01)。结论过表达HSP20能显著抑制H2O2诱导的H9C2心肌细胞凋亡。     

Verotoxin sensitivity of ECV304 cells in vitro and in vivo in a xenograft tumour model: VT1 as a tumour neovascular marker

Binding of verotoxin 1 (VT1) via its receptor (globotriaosylceramide/Gb3) to both endothelial and tumour cell subsets suggests that VT1 may have both antineoplastic and antiangiogenic potential. We investigated this potential using the ECV304 cell line, which, although identified as a bladder carcinoma cell line, displays some endothelial characteristics, including tubule formation (differentiation) following appropriate stimulation. Differentiated ECV304 cells retained Gb3 expression/VT1 sensitivity. VT1 internalization and retrograde transport through the Golgi to the ER was observed. ECV304 xenografts in immunocompromised mice were invasive but surprisingly poorly vascularized. Intratumoural VT1 injection significantly reduced ECV304 xenograft growth and enhanced mouse survival. Gb3 expression was decreased in residual tumour, likely due to cell cycle arrest. Untreated ECV304 xenograft sections bound VT1 throughout the tumour. Anti-von Willebrand factor (vWF) antibody staining for neovasculature showed only morphologically atypical, indistinct structures, unlabelled by VT1. Human bladder carcinoma samples were, in contrast, highly vascular and blood vessels were 100% co-labelled by anti-vWF antibody and VT1, with no extravascular staining. These results suggest that ECV304 xenografts are not characteristic of bladder carcinoma in terms of Gb3 expression, and that VT1 staining may provide a new reliable index of tumour neovasculature. We conclude that ECV304 cells are not an appropriate in vivo model of either tumour angiogenesis or bladder carcinoma. These studies, nevertheless, further demonstrate the in vivo antineoplastic and antiangiogenic potential of VT1, and show that Gb3 is expressed in cells undergoing in vitro 'vascular' differentiation, and in the neovasculature of human bladder carcinomas.     

Interaction of cytokines and growth factor in the regulation of verotoxin-induced apoptosis in cultured human endothelial cells

The role of CD77, inflammatory cytokines and endothelial cell growth factor (ECGF) in verotoxin (VT)-induced apoptosis in human umbilical vein endothelial cells (HUVECs) was studied. Apoptosis was detected using annexin V and propidium iodide staining. The expression of CD77 antigen was measured on a FACStar flow cytometer using specific monoclonal antibodies. Our experiments showed that HUVECs had very low initial levels of CD77 and were resistant to VT. Treatment with tumour necrosis factor alpha (TNF-alpha) resulted in a significant upregulation of CD77 expression and sensitized endothelial cells to VT-mediated apoptosis. HUVECs incubated with a combination of cytokines [TNF-alpha and interferon gamma (IFN-gamma), both 500 U/ml] showed more pronounced upregulation of CD77 expression (> sixfold at 48 h) and underwent apoptosis, suggesting that TNF-alpha and IFN-gamma have a synergistic effect on CD77 expression in HUVECs and can induce apoptosis without VT. Cells pretreated with TNF-alpha and IFN-gamma and incubated with VT showed the most pronounced (14-fold) increase in CD77 expression. ECGF had a partial protective effect against cytokine- and VT-induced apoptosis. Taken together, our data suggest that CD77 antigen is involved in the regulation of endothelial cell apoptosis.     

Induction of a 72-kDa heat shock protein and protection against lipopolysaccharide-induced liver injury in cirrhotic rats

BACKGROUND AND AIM: A 70-kDa heat shock protein (stress-inducible HSP70, HSP72) has been reported to be a cytoprotectant in a variety of organs. It has been reported that HSP72 protected non-cirrhotic rats against endotoxemia. However, its cytoprotective effect against endotoxemia in cirrhotic rats has not yet been studied. In this study, we investigated the cytoprotective effect of HSP72 on lipopolysaccharide (LPS)-induced liver injury in carbon tetrachloride (CCl(4))-induced cirrhotic rats. METHODS: Liver cirrhosis was produced by an 8-week intraperitoneal injection of CCl(4) in male Sprague-Dawley rats. Expression of HSP72 was investigated using western blot analysis. Cirrhotic rats were given an intraperitoneal injection of LPS (10 mg/kg) with or without hyperthermia (42.5 degrees C, 15 min) preconditioning. Liver injury was assessed biochemically (aspartate transaminase, alanine transaminase, bilirubin, lactate dehydrogenase, creatinine) and histologically. The plasma tumor necrosis factor (TNF)-alpha level was determined. RESULTS: Hyperthermia preconditioning induced a 4-fold increase in HSP72 in the cirrhotic rat liver. Pre-induction of HSP72 prevented LPS-induced liver injury, as evaluated using serum biochemical parameters and histology with reduced TNF-alpha response. CONCLUSION: These findings suggest that pre-induction of HSP72 may provide therapeutic strategies for Gram-negative sepsis-induced liver injury in liver cirrhosis.     

不同浓度葡萄糖对人血管内皮细胞的影响

目的研究高浓度葡萄糖对人血管内皮细胞的影响。方法在人脐静脉内皮细胞株ECV304培养基中分别加入5.5、20、40 mmol/L葡萄糖,作用24~72 h。采用四甲基偶氮唑盐微量酶反应比色（MTT）法观察细胞增殖情况,倒置相差显微镜观察细胞形态,透射电镜观察内皮细胞V304凋亡情况;流式细胞术检测细胞凋亡率。结果高浓度葡萄糖能明显抑制血管内皮细胞的增殖,诱导培养的内皮细胞发生凋亡,细胞凋亡率增加,并随浓度的增高、时间的延长作用明显。结论高浓度葡萄糖能抑制培养的人血管内皮细胞增殖,促进细胞凋亡。     

单核—巨噬细胞和ECV304内皮细胞表达死亡相关蛋白

为研究单核——巨噬细胞和ECV304细胞是否表达死亡相关蛋白以及影响死亡相关蛋白表达的因素。分别用氧化型低密度脂蛋白(100mg／L)孵育THP-1细胞，H2O2(1mmol／L)孵育ECV304细胞，用逆转录聚合酶链反应检测死亡相关蛋白mRNA的表达。结果发现，THP-1细胞及ECV304细胞均表达死亡相关蛋白，氧化型低密度脂蛋白和H2O2能分别诱导THP-1细胞和ECV304细胞死亡相关蛋白mRNA表达增高。实验结果提示死亡相关蛋白可能参与调节氧化应激诱导的单核—巨噬细胞和内皮细胞的凋亡。     

血红素加氧酶-1基因转染对内毒素诱导的ECV304细胞氧化损伤的影响

目的 探讨血红素加氧酶-1( HO-1)基因转染对脂多糖诱导的ECV304细胞氧化损伤的影响.方法 利用逆转录病毒介导的基因转染技术将HO-1基因转染人人脐静脉内皮细胞(ECV304),应用RT-PCR和Western印迹技术检测转染细胞HO-1 mRNA和蛋白表达水平.未转染和转染HO-1基因的ECV304细胞分别培养于含或不含脂多糖(5 mg/L)的DMEM培养基24h后,检测细胞脂质过氧化产物丙二醛(MDA)含量和乳酸脱氢酶(LDH)释放率.结果 HO-1基因和蛋白在转染的ECV304细胞的表达量显著升高.与ECV304细胞相比,转染HO-1基因的ECV304细胞MDA含量和LDH释放率均下降(P＜0.05);应用HO-1抑制剂锌原卟啉共孵育后,转染细胞的MDA含量和LDH释放率增高.结论 HO-1的基因转染可增强ECV304细胞对抗脂多糖氧化损伤的能力.     

Melatonin prevents apoptosis and enhances HSP27 mRNA expression induced by heat shock in HL-60 cells: possible involvement of the MT2 receptor

Previous studies have reported that melatonin protects cells and tissues against stressful stimuli. In the present study using HL-60 cells, we show that cells acquire increased resistance to apoptosis normally induced by heat shock when they are incubated with melatonin. This effect of melatonin is saturable at nanomolar concentrations and appears to be mediated by the MT2 subtype melatonin receptor. The high affinity melatonin receptor agonist, 2-iodomelatonin, reproduced the melatonin effect while it was fully blocked by the selective MT2 antagonist 4-phenyl-2-propionamidotetraline. The melatonin response to heat shock-induced apoptosis was pertussis toxin sensitive and, interestingly, the non-selective MT1/MT2 melatonin receptor ligand luzindole was found to display agonistic activity. Furthermore, we provide evidence that melatonin enhanced HSP27 mRNA expression as a result of heat shock - HSP27, is known to play an important role in the defense of cells against apoptosis induced by stressful agents. Together, these results demonstrate that melatonin, likely via receptor mechanisms, interferes with the apoptotic pathway activated by heat shock.     

Heat shock protein 70 antisense oligonucleotide inhibits cell growth and induces apoptosis in human gastric cancer cell line SGC-7901

AIM: Heat shock protein (HSP)70 is over-expressed in human gastric cancer and plays an important role in the progression of this cancer. We investigated the effects of antisense HSP70 oligomer on human gastric cancer cell line SGC-7901, and its potential role in gene therapy for this cancer. METHODS: Human gastric cancer cell line SGC-7901 was treated in vitro with various concentrations of antisense HSP70 oligonucleotides at different intervals. Growth inhibition was determined as percentage by trypan blue dye exclusion test. Extracted DNA was electrophoresed on agarose gel, and distribution of cell cycle and kinetics of apoptosis induction were analyzed by propidium iodide DNA incorporation using flow cytometry, which was also used to detect the effects of antisense oligomer pretreatment on the subsequent apoptosis induced by heat shock in SGC-7901 cells. Proteins were extracted for simultaneous measurement of HSP70 expression level by SDS-PAGE Western blotting. RESULTS: The number of viable cells decreased in a dose-and time-dependent manner, and ladder-like patterns of DNA fragments were observed in SGC-7901 cells treated with antisense HSP70 oligomers at a concentration of 10μmol/L for 48 h or 8μmol/L for 72 h, which were consistent with inter-nucleosomal DNA fragmentation. Flow cytometric analysis showed a dose- and time-dependent increase in apoptotic rate by HSP70 antisense oligomers. This response was accompanied with a decrease in the percentage of cells in the G_1 and S phases of the cell cycle, suggesting inhibition of cell proliferation. In addition, flow cytometry also showed that pretreatment of SGC-7901 cells with HSP70 antisense oligomers enhanced the subsequent apoptosis induced by heat shock treatment. Western blotting demonstrated that HSP70 antisense oligomers inhibited HSP70 expression, which preceded apoptosis, and HSP70 was undetectable at the concentration of 10 μmol/L for 48 h or 8 μmol/L for 72 h. CONCLUSION: Antisense HSP70 oligomers can abrogate HSP70 expression in SGC-7901 cells, which may in turn induce apoptosis and inhibit cell proliferation, conversely suggesting that HSP70 is required for the proliferation and survival of human gastric cancer cells under normal conditions.     

Acetylsalicylic acid-induced release of HSP70 from mast cells results in cell activation through TLR pathway

OBJECTIVE: Mast cells are considered major players in IgE-mediated allergic responses, but have also recently been recognized as active participants in innate as well as specific immune responses. Heat stress can modulate innate immunity by inducing stress proteins such as heat shock proteins (HSPs). It has been reported that HSPs are capable of inducing the production of pro-inflammatory cytokines by the monocyte-macrophage system. In the current study, we explored whether the stress response induces HSPs and affects the signaling pathways of mast cells. METHODS: In mouse mast cells, derived from a culture of bone marrow cells of male BALB/cBy and null HSF-1(-/-) mice, responsiveness to exogenous and endogenous HSP70 was monitored by measuring cytokine release. RESULTS: Using BMMC, we show that treatment with heat shock or acetylsalicylic acid results in a selective induction of HSPs, and leads to release of HSP70 into the extracellular environment. The release of HSP70 from mast cells may be of functional importance. We found that after induction of HSP70, the production of TNF-alpha and IL-6 was increased. In a number of experiments, we demonstrated that exogenous/secreted HSP70 is most likely responsible for the activation of mast cells to produce cytokines. Extracellular HSP70 induced production of TNF-alpha and IL-6 through the activation of the TLR4 receptor pathway, which was evidenced by an abrogation of the response in mast cells cultured from TLR4(null) or HSF-1(-/-) mice. CONCLUSION: Our experiments suggest that stress conditions can induce pro-inflammatory cytokine production by mast cells through an autocrine or paracrine stimulation of TLR receptors after a heat shock response. The recognition that heat shock proteins induce mast cell activation suggests an involvement of these cells in the immunological processes induced by heat shock response.     

DNA Fragmentation and HSP72 Gene Expression by Adenovirus-Mediated Gene Transfer in Postischemic Gerbil Hippocampus and Ventricle

A replication defective adenoviral vector containing the E. coli lacZ gene (AdCMVnLacZ) was directly injected into right hippocampus and lateral ventricle immediately after 5 min of transient global ischemia in gerbils. The relations between the lacZ gene expression and DNA fragmentation or heat shock protein 72 (HSP72) immunoreactivity were examined up to 21 days post ischemia. The lacZ gene was transiently expressed at 1 day in the hippocampus except around the CA1 region, while a large number of the periventricular cells strongly expressed the lacZ gene from 8 h to 7 days. In CA1 layer terminal deoxynucleotidyl dUTP nick end labeling (TUNEL) positive cells, which were present only adjacent to the needle track at 8 h to 1 day, became more extensive in the whole CA1 layer at 3 to 7 days. TUNEL-positive cells were also detected around the DG at 1 day, around the needle track at 8 h to 3 days, and in the choroid plexus cells at 7 days HSP72 staining was detected in the subiculum at 1 to 3 days, the dentate granule cells at 8 h to 1 day, and in the CA3 or CA4 pyramidal cells at 1 to 3 days. Some lacZ expressing cells were double-positive with HSP72 in DG, while the majority of those were distinguished from the TUNEL-positive cells. Pyramidal neurons were almost completely lost in the CA1 sector at 7days after the ischemia. The present study demonstrates the successful LacZ gene transfer into the hippocampus and ventricle of postischemic gerbil brain except in the vulnerable CA1 layer by adenoviral vector injection. However adenovirus-mediated gene transfer may induce indirect apoptotic cell death in the DG and ventricle, in addition to direct traumatic injury around the needle track.     

Overexpression of truncated IkappaBalpha induces TNF-alpha-dependent apoptosis in human vascular smooth muscle cells

Dysregulation of apoptosis is one of the likely underlying mechanisms of neointimal thickening, a disorder in which proinflammatory cytokines may influence the function of vascular smooth muscle cells (VSMCs) and contribute to atherogenesis. One of these cytokines, tumor necrosis factor-alpha (TNF-alpha), induces 2 possibly conflicting pathways, 1 leading to the activation of nuclear factor-kappaB (NF-kappaB) and the other leading to caspase-mediated apoptosis. We investigated whether specific inhibition of NF-kappaB affects TNF-alpha-dependent apoptosis in human VSMCs. To inhibit NF-kappaB activation specifically, we constructed a recombinant adenovirus vector expressing a truncated form of the inhibitor protein IkappaBalpha (AdexIkappaBDeltaN) that lacks the phosphorylation sites essential for activation of NF-kappaB. The IkappaBDeltaN was overexpressed by adenoviral infection and was resistant to stimulus-dependent degradation. Electromobility gel shift and luciferase assays demonstrated that overexpression of IkappaBDeltaN inhibited NF-kappaB activation induced by TNF-alpha or interleukin-1beta (IL-1beta). In cells overexpressing IkappaBDeltaN, TNF-alpha dramatically induced apoptosis, whereas IL-1beta had no effect. The induction was suppressed by treatment with a selective inhibitor of the caspase-3 family, Z-DEVD-fmk, and the overexpression of IkappaBDeltaN induced TNF-alpha-mediated caspase-3 and caspase-2 activity. These results indicate that overexpression of IkappaBDeltaN induces TNF-alpha-dependent apoptosis by efficient and specific suppression of NF-kappaB and upregulation of caspase-3 and caspase-2 activity in human VSMCs. Our findings suggest that adenovirus-mediated IkappaBDeltaN gene transfer may be useful in the treatment of disorders associated with inflammatory conditions, such as the response to vascular injury and atherosclerosis.     

Chlamydia pneumoniae stimulates proliferation of vascular smooth muscle cells through induction of endogenous heat shock protein 60

Chlamydia pneumoniae infection has been linked with atherosclerosis. However, the mechanism responsible for the atherogenic effects of C pneumoniae remains unclear. Heat shock proteins (HSPs) have been found in atherosclerotic lesions. HSPs of HSP70 and HSP90 families are involved in the regulation of cell cycle progression and cell proliferation. We assessed the hypothesis that HSP60 is induced in vascular cells infected with C pneumoniae and stimulates cell proliferation. Rabbit vascular smooth muscle cells (VSMCs) and human umbilical vein endothelial cells (HUVECs) were infected with C pneumoniae. Western blot analysis demonstrated the induction of endogenous HSP60 expression in C pneumoniae-infected VSMCs. C pneumoniae infection significantly increased the number of VSMCs, and the mitogenic effect correlated with the expression level of endogenous HSP60. In contrast to VSMCs, C pneumoniae infection had no effect on the expression level of HSP60 and did not stimulate cell proliferation in HUVECs. Exogenous addition of recombinant chlamydial HSP60 had no mitogenic effect on VSMCs and HUVECs. However, overexpression of HSP60 within VSMCs by infection with adenovirus encoding human HSP60 resulted in a significant increase in cell numbers compared with uninfected VSMCs. These results suggest that overexpression of endogenous HSP60 may be a central intracellular event responsible for the mitogenic effects induced by C pneumoniae infection. In addition to C pneumoniae, other infectious agents and atherogenic risk factors may also stimulate VSMC proliferation and contribute to the lesion formation through the induction of HSP60.     

Heat shock response decreases endotoxin-induced acute lung injury in rats

OBJECTIVE: Transient whole-body hyperthermia was reported to reduce lung damage in a rat with intra-abdominal sepsis produced by caecal perforation. METHODOLOGY: In order to determine the effect of heat shock response on acute lung injury induced by endotoxin, which plays a central role in the pathogenesis of sepsis, we instilled either saline or lipopolysaccharide (LPS) intravenously with and without heat pretreatment in rats. The heated rats had their rectal temperature raised to more than 40 degrees C for 13 min 18 h before intravenous administration of saline or LPS. RESULTS: We found that the lung leak was significantly increased among the rats given LPS intravenously with (median, 0.17; range, 0.15-0.22; n = 10) and without heat pretreatment (0.23; 0.17-0.30; n = 10) compared with those of saline-treated rats (0.13; 0.10-0.14; n = 10) (P < 0.05 in each). However, rats given LPS after heat pretreatment had significantly decreased lung leak index compared with those of LPS-treated rats without heat pretreatment (P < 0.05). Rats administered LPS intravenously showed increased myeloperoxidase activity without heat pretreatment (19.01; 9.34-28.00 U/g; n = 10) compared with that of saline-treated rats (7.09; 4.49-10.56 U/g; n = 5) (P < 0.05) (Fig. 2). Myeloperoxidase activity of the rats treated with LPS with heat pretreatment (5.57; 2.87-8.96 U/g; n = 10) was significantly decreased to the level of normal control compared with that of LPS-treated rats without heat pretreatment (P < 0.05). The levels of heat shock proteins (HSP72) in lung tissue, which were examined by western blot analysis, were increased over baseline levels at 23 h after hyperthermic stress. CONCLUSIONS: These observations show that brief heat shock response is associated with the induction of HSP72 protein synthesis and attenuated neutrophil recruitment and acute lung leak is induced by endotoxin in rats.     

载体肝干细胞分泌表达的Endostatin对血管内皮细胞增殖和凋亡的影响

目的观察携带内皮抑素基因的载体肝干细胞分泌表达的内皮抑素蛋白（Endostatin，ES）对血管内皮细胞体外增殖和凋亡的影响。方法体外扩增培养本室构建的携带内皮抑素基因的载体肝干细胞WB-ES，收集合有分泌型Endostatin的上清液。将人脐静脉内皮细胞ECV304体外增殖培养，加入不同浓度的含倍比稀释Endostatin的上清液，在不同的作用时间（24、48、72h），通过四甲基偶氮唑蓝比色法（MTT）检测细胞生长抑制率。采用流式细胞仪检测细胞周期和凋亡率，分析载体肝干细胞WB—ES分泌表达的Endostatin对ECV304的增殖和凋亡的影响。结果载体肝干细胞胞外表达的Endostatin对人脐静脉内皮细胞ECV304生长有显著抑制作用，48h作用达到高峰，随浓度增加抑制作用增强；Endostatin作用的实验组，G1期细胞比例增加，s期细胞数下降，抑制细胞生长的机制可能主要是通过对细胞增殖的影响（P〈0．05）；实验组细胞存在细胞凋亡增加现象，但与对照组比较凋亡率差异无统计学意义。结论携带内皮抑素基因的载体肝干细胞WB-ES胞外表达的Endostatin在体外可有效抑制血管内皮细胞增殖，载体肝干细胞WB-ES有望成为靶向抗肿瘤血管生成的肝癌基因治疗载体细胞。     

Proteasome inhibition increases HuR level, restores heat-inducible HSP72 expression and thermotolerance in WI-38 senescent human fibroblasts

At the end of their replicative potential in vitro, late passage WI-38 human diploid fibroblasts (HDF) have a low basal expression of heat shock protein 72 (HSP72) and an attenuated ability to induce it in response to heat shock. The transient exposure to the specific and reversible proteasome inhibitor MG132 during a mild heat shock induced late passage HDF to synthesize and accumulate high levels of HSP72. This HSP72 expression was long-lasting and appeared to result from both increased cytoplasmic levels and enhanced translation of HSP72 mRNA. The level of HuR, a stabilizing mRNA-binding protein, increased following the MG132 treatment. This result is consistent with the proposed role of HuR in assisting mRNA export to the cytoplasm and in antagonizing its degradation. Furthermore, the previous exposure of late passage HDF to a mild heat shock in the presence of MG132 protected these cells against the otherwise lethal effect of a subsequent severe heat shock. This acquisition of thermotolerance appeared to be correlated with the level of HSP72.     

尼克酰胺腺嘌呤二核苷酸磷酸氧化酶4过表达对人脐静脉内皮细胞凋亡和活性氧水平的影响

目的研究尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4表达水平的改变对内皮细胞活性氧生成和凋亡的影响。方法转染尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4表达质粒或GFP质粒到人脐静脉内皮细胞和ECV304中,用逆转录聚合酶链反应检测转染后尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4mRNA的水平,用流式细胞仪检测细胞内活性氧水平和细胞凋亡率,用Hoechst染色和TUNEL法观察细胞凋亡。结果转染后的人脐静脉内皮细胞中尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4mRNA水平明显高于GFP质粒组和对照组,不表达尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶的ECV304细胞系经转染后亦表达尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4mRNA;流式细胞仪检测发现,与GFP质粒组(ECV304和人脐静脉内皮细胞的凋亡率分别为1.56%±0.33%和4.56%±0.62%)和对照组(ECV304和人脐静脉内皮细胞的凋亡率分别为1.05%±0.25%和2.28±0.37%)相比,转染尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4质粒组内皮细胞的活性氧生成和凋亡率(ECV304和人脐静脉内皮细胞的凋亡率分别为9.60%±0.92%和12.41%±1.12%)明显增加(P<0.05,n=3);Hoechst和TUNEL染色发现,转染尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4质粒后有部分内皮细胞胞核出现凋亡特征性改变。结论尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4表达质粒可有效地转染人脐静脉内皮细胞,引起尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4mRNA水平升高;尼克酰胺腺嘌呤二核苷酸磷酸盐氧化酶4过表达可诱导人脐静脉内皮细胞凋亡。