Expression of fractalkine and its receptor in acute cardiac allografts rejection

Objective To investigate the expression of fractalkine(FKN) and its receptor CX3CR1 in cardiac allografts and the effect of Cyclosporin A(CsA). Methods Three groups of rats underwent heterotopic cardiac transplantation, 45 cases in each group and 5 cases in control group:SD to SD regarded as isograft group (group A), Wistear to SD divided into CsA untreated allograft group(group B) and CsA treated allograft group (group C), normal SD rats as control group. The FKN mRNA expression was detected by one-step RT-PCR method and the expression of FKN and CX3CR1 protein was detected by standard ABC immunohistochemical technique. Results The expressin of FKN mRNA and protein was weak in both isografts and normal heart specimens. The changes of FKN mRNA expression were correkted with the process of acute allograft rejection. The peak of FKN mRNA expression(0.8 ±0.26) appeared on the seventh day after transplantation, which could be downregulated by CsA significantly ( t = 2.390, P < 0.05). FKN protein was locate     

Bcl-xl反义寡核苷酸转染对肺腺癌A549细胞增殖及凋亡的影响

目的研究Bcl-xl反义寡核苷酸(ASODN)对肺腺癌A549细胞增殖及凋亡的影响。方法将肺腺癌A549细胞分为细胞对照组(无脂质体及核酸)、脂质体(Lip)组(空脂质体,无核酸)、序列对照寡核苷酸(SCODN)组和ASODN组,设计合成特异性靶向Bcl-xl ASODN,用阳离子脂质体介导其转染肺腺癌A549细胞株。采用细胞计数试剂盒(CCK8)法检测A549细胞增殖抑制率;末端脱氧核苷酰基转移酶介导性d UTP切口末端标记(TUNEL)法检测A549细胞凋亡情况;反转录-聚合酶链反应(RT-PCR)和Western blot法检测A549细胞中Bcl-xlm RNA和蛋白表达水平。结果 ASODN和SCODN浓度为50 nmol·L~(-1)时,各组A549细胞增殖抑制率比较差异均无统计学意义(P>0.05);浓度为100、200、400 nmol·L~(-1)时,ASODN组A549细胞增殖抑制率均高于SCODN组和Lip组(P<0.05);ASODN对细胞增殖抑制作用随其浓度增加而增高,具有剂量依赖性(P<0.05)。细胞对照组、Lip组、SCODN组和ASODN组细胞凋亡率分别为(4.01±0.18)%、(5.23±0.22)%、(8.01±0.32)%和(41.50±1.91)%,ASODN组细胞凋亡率高于SCODN组、Lip组和细胞对照组(P<0.05)。ASODN和SCODN浓度为50 nmol·L~(-1)时,各组A549细胞中Bcl-xl mRNA表达量比较差异均无统计学意义(P>0.05);浓度为100、200、400 nmol·L~(-1)时,ASODN组A549细胞中Bcl-xl mRNA表达量均低于SCODN组、Lip组和细胞对照组(P<0.05);ASODN组A549细胞中Bcl-xl mRNA表达量随浓度增加相应地下降(P<0.05);SCODN组和Lip组Bcl-xl mRNA表达量较细胞对照组下降,但差异均无统计学意义(P>0.05)。细胞对照组、Lip组、SCODN组和ASODN组A549细胞中Bcl-xl蛋白表达量分别为0.62±0.17、0.67±0.27、0.62±0.21和0.23±0.10,ASODN组A549细胞中Bcl-xl蛋白表达量低于细胞对照组、Lip组和SCODN组(P<0.05)。结论转染Bcl-xl ASODN可下调Bcl-xl基因表达,能有效抑制A549细胞增殖,并显著促进A549细胞凋亡;Bcl-xl基因有望成为肺腺癌基因治疗的新靶点。     

ROLE OF B LYMPHOCYTE AND ITS SUBPOPULATIONS IN PATHOGENESIS OF IMMUNORELATED PANCYTOPENIA

Objective To measure the quantities and apoptosis-related protein levels of B lymphocyte in the patients with immunorelated pancytopenia(IRP)and explore the action of B lymphocyte in the pathogenic mechanism of IRP. Methods Quantities of whole B lymphocytes and CD5 B lymphocytes as well as the expressions of Fas and Bcl-2 in B lymphocytes in 35 patients with untreated IRP, 15 IRP patients in complete remission (CR), and 10 normal controls were assayed by flow cytometry. Results The percentages of B lymphocyte and CD5 B lymphocyte were significantly higher in untreated IRP patients than in CR IRP patients and normal controls (P<0.05), and there was no significant difference between the latter two groups (P>0.05). There was no significant difference of Fas expression in B lymphocyte among three groups (P>0.05). The expression of Bcl-2 in B lymphocyte was significantly higher in untreated patients than in CR patients or normal controls (P<0.01), and significantly higher in CR patients than in normal controls (P<0.01). The apoptosis-related index was significantly lower in untreated patients than in CR patients or normal controls (P<0.05), and significantly lower in CR patients than in normal controls (P<0.05). The percentage of B lymphocyte was positively correlated with post-treated response time(r=0.53, P<0.01). Conclusion The production of auto-antibodies in IRP patients probably has some relationship with the abnormal quantities of B lymphocyte and its subpopulations as well as with the inhibition of B lymphocyte apoptosis.     

Influence of L-arginine on the Expression of eNOS and COX2 in Experimental Pulmonary Thromboembolism

The influence of L-arginine on endothelial nitric oxide synthase (eNOS) and cyclooxy-genase 2 (COX2) was observed in experimental pulmonary thromboembolism and the action mechanism on pulmonary thromboembolism was explored. Wistar rats were randomly divided into control group, model group and treatment group. Pulmonary thromboembolism models were established by auto-blood back transfusion, and L-Arg 100 mg/kg was intraperitoneally injected after successful model preparation. The animals were sacrificed at 3 h, 1 day, 3 days and 7 days after embolism. Plasma NO, TXB2 and 6-Keto-PGF1αwere detected. The expression of eNOS and COX2 protein and mRNA in pulmonary tissues was detected by immunohistochemistry and RT-PCR respectively. The results showed that pulmonary thrombosis could be seen post pulmonary embolism and inflammatory reaction was significant. Plasma NO was decreased (P<0.01), and the levels of TXB2, 6-Keto-PGF1αand T/P ratio were all elevated. The expression of eNOS protein and mRNA in the pulmonary tissue was down-regulated (P<0.05), while that of COX2 protein and mRNA was upregu-lated (P<0.01). In treatment group, the level of NO was increased, the levels of TXB2 and T/P ratio were decreased, but the level of 6-Keto-PGF1αwas increased. The expression of eNOS protein and mRNA in pulmonary tissue was upregulated (P<0.05), while that of COX2 protein and mRNA was down-regulated (P<0.05). In conclusion, L-arginine can educe the role of pulmonary tissue protection through up-regulating the expression of intra-pulmonary NOS and down -regulating COX2 in pulmonary thromboembolism.     

Expression of Toll-like receptor 4 in neonatal cord blood mononuclear cells in patients with preeclampsia

The expression of Toll-like receptor 4 (TLR4) in neonatal cord blood mononuclear cells (MNCs) and serum TNF-α were investigated in order to explore the roles of TLR4 in the pathogenesis of preeclampsia.The study enrolled 27 patients suffering from preeclampsia (experimental group) and 21 normal pregnancy patients (control group).After MNCs were separated, the expression of TLR4 mRNA and protein was detected by using real-time quantitative PCR and Western blotting respectively, and the expression of TNF-α by using ELISA.The results showed the TLR4 mRNA level in cord blood MNCs (2-CT:0.07±0.17), TLR4 protein expression level (absorbance ratio:0.81%±0.15%) and TNF-α level (9.5±1.73 pg/mL) were all increased in experimental group as compared with control group with the differences being statistically significant (P<0.05).There was a positive correlation between the expression of TLR4 mRNA and TNF-α in both experimental group and control group (r=0.54 and 0.53, respectively, P<0.05).It was concluded that TLR4 expression in the experimental group of cord blood MNCs was increased and there was a positive correlation between the expression of TLR4 mRNA and TNF-α in both groups.TLR4-mediated release of inflammatory cytokines may be one of the important reasons leading to preeclampsia.     

高糖培养对LO2肝细胞株铁代谢相关蛋白的影响

目的 探讨高浓度葡萄糖对LO2肝细胞株铁调节蛋白1(iron regulatory protein 1,IRP1)、转铁蛋白受体1(transferring receptor 1,TfR1)、转铁蛋白受体2(transferring receptor 2,TfR2)、铁调素(hepcidin)表达的影响. 方法 LO2肝细胞株分为高糖组(25 mmol/L葡萄糖)和对照组(5.5 mmol/L葡萄糖)培养0-48 h,分别在0 h,12 h,24 h,48 h检测细胞活性氧(ROS)水平及IRP1、TfR1、TfR2、hepcidin的表达量. 结果 高糖组细胞内ROS水平、IRP1、TfR1、TfR2表达量随培养时间延长逐步升高(P<0.01),hepcidin从24 h时表达量显著升高(P<0.01);12 h,24 h,48 h时高糖组与同时刻对照组相比细胞内ROS水平、IRP1、TfR1、TfR2表达量均显著升高(P<0.01);24 h与48 h时高糖组与同时刻对照组相比hepcidin表达量升高(P<0.01);对照组细胞内ROS水平从24 h时升高(P<0.05),以上蛋白在各时间表达均无显著变化(P>0.05). 结论 高浓度葡萄糖使正常人肝细胞铁代谢相关蛋白的表达增加,可能与高糖培养诱发活性氧的大量增加有关.     

Effects of Hirudin on High Glucose-Induced Oxidative Stress and Inflammatory Pathway in Rat Dorsal Root Ganglion Neurons

Objective: To investigate protective effects of hirudin on oxidative stress and apoptosis of spinal dorsal root ganglion cells in high-glucose rats at the cellular and molecular level. Methods: Dorsal root ganglion neurons(DRGn) were harvested from embryonic day in 15 SD rats, purified and identificated after primary culture. They were divided into the normal control group, high-glucose(HG) group, positive control(alpha-lipoic acid, ALA) group, low-dose hirudin group(H1), medium-dose hirudin group(H2) and high-dose hirudin group(H3). The control group was cultured by neuron specific culture medium, while the HG group was cultured by neuron specific culture medium and 20 mmol/L glucose(HG medium). The hirudin groups were cultured by HG medium+0.25 IU/mL hirudin(H1), HG medium+0.5 IU/mL hirudin(H2) and HG medium+1 IU/mL hirudin(H3). The ALA group was cultured by HG medium+100 μmol/L ALA. 3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenylt etrazolium bromide(MTT) assay was used to explore the optimum concentration and intervention time. Flow cytometry assay was used to detect the level of reactive oxygen series(ROS). Western blot and quantificational realtime polymerase chain reaction(qRT-PCR) were used to detect the expression of protein and mRNA of nuclear factor erythroid 2-related factor 2(Nrf-2), hemeoxygence-1(HO-1), nuclear factor-κB(NF-κB) and Caspase-3. TUNEL assay was used to test the apoptosis rate of different groups. Results: After 24 h of culture, the cell activity of hirudin and ALA groups were higher than that of HG group, and there was a statistical difference between the H1 group and HG group(P0.05). In hirudin groups, the apoptosis rate of cells, the expression of activated Caspase-3 protein and Caspase-3 mRNA were lower than those of HG group(P0.01), higher than those of ALA group(P0.01 or P0.05). The ROS level of hirudin groups was higher than that of ALA group(P0.01), lower than that of HG group(P0.01 or P0.05). The expression of NF-κB(P65) protein in H3 group were lower than those of HG group(P0.05). The expression of Nrf-2 protein in hirudin groups was higher than that of HG group(P0.01), lower than that of ALA group(P0.01 or P0.05). The expression of HO-1 protein in hirudin groups was lower than that of ALA group(P0.01 or P0.05), higher than that of HG group(P0.01 or P0.05). Conclusions: The activity of DRGn cells can be promoted by hirudin under HG conditions. The effects of hirudin on the inhibition of HG on DRGn cells damage mainly include scavenging ROS, up-regulating Nrf-2/HO-1 pathway, inhibiting activation of NF-κB pathway, down-regulating the expression of and Caspase-3 and reducing DRGn cell apoptosis.     

Increased Expression of PI-3K in Asthmatic Rat T Lymphocytes

In order to explore the expression of PI-3K in T lymphocytes of asthmatic rats and the relationship between PI-3K and activation of T lymphocytes, 24 Wistar rats were randomly divided into 4 groups: normal control group, asthmatic one-week group, asthmatic two-week group and asth-matic four-week group. T cells were purified from blood of each rat and the expression of PI-3K was observed by immunocytochemical fluorescence staining, the semiquantitative fluorescence intensity was measured by HPIAS-2000 analytic software, and the expression of IL-4 in supernatants was de-tected by ELISA. The results showed that the fluorescence intensity of T lymphocytes in asthmatic groups was significantly higher than that in normal control (P<0.001), indicating that the expression of PI-3K in T lymphocytes of asthmatic rats was significantly higher than that in those of normal controls, and the difference between acute and chronic stage asthmatic groups was significant (P<0.05). The expression levels of IL-4 protein in supernatants of asthmatic T lymphocytes were sig-nificantly higher than those in the normal controls (P<0.05). There was a significant positive correla-tion between the expression of PI-3K in T lymphocytes and the IL-4 protein expression in super-natants (r=0.583, P<0.01). It was suggested that PI-3K signal pathway may participate in the proc-esses of activation and other cytological effects of asthmatic T lymphocytes, thus may play an impor-tant roles in the pathogenesis of asthma.     

反义寡核苷酸抑制MMP7基因表达对肺腺癌A549细胞凋亡敏感性影响的研究

目的观察基质溶解素(matrilysin,MMP7)反义寡核苷酸(antisense ligodeoxynucleotide,ASODN)对肺腺癌A549细胞凋亡敏感性的影响。方法采用硫代磷酸修饰的MMP7ASODN,通过脂质体导入A549细胞后,RT-PCR检测MMP7 ASODN对MMP7 mRNA表达的影响;流式细胞仪检测其对细胞膜Fas抗原表达率的影响;加入重组FasL,诱导凋亡,流式细胞仪检测凋亡率。结果RT-PCR结果表明,MMP7 ASODN转染能显著抑制A549细胞MMP7 mRNA表达。流式细胞仪检测表明,MMP7ASODN转染A549细胞后,与未转染组和错义寡核苷酸(scrambled oligodeoxynucleotide,SCODN)组比较,细胞膜Fas蛋白表达率增高,有显著性差异(P<0.01)。加入重组FasL,诱导细胞凋亡,细胞凋亡率明显增高,与未转染组和SCODN组有显著性差异(P<0.01)。结论MMP7ASODN可以抑制肺腺癌A549细胞株MMP7基因的表达,上调细胞膜Fas抗原表达,增强A549细胞凋亡敏感性。     

c-FLIP反义寡核苷酸对食管癌EC109细胞裸鼠移植瘤抑制作用的实验研究

目的研究细胞型Fas相关死亡域样白介素-1β转换酶抑制蛋白反义寡核苷酸（c-FLIP-ASODN）对食管癌EC109细胞裸鼠移植瘤的作用。方法采用食管癌EC109细胞株建立裸鼠移植瘤模型，将其分为空白对照组、脂质体转染组、无义寡核苷酸（SODN）组、ASODN组。通过移植瘤生长曲线、终末瘤重，免疫组化法检测c-FLIP蛋白表达、增殖指数，RT-PCR检测移植瘤c-FLIP-mRNA变化，TUNEL检测凋亡指数，观察c-FLIP-ASODN对食管癌裸鼠移植瘤的作用。结果ASODN组治疗后移植瘤生长缓慢，实验结束时ASODN组瘤重及瘤体积明显低于其它各组，抑瘤率为68.19％。ASODN组移植瘤组织c-FLIP-mRNA及蛋白、Ki-67抗原表达较其它各组明显减少，而移植瘤细胞凋亡指数明显高于其它各组(P均<0.01)。其余三组上述指标间比较差异无统计学意义(P>0.05)。结论c-FLIP -ASODN对食管癌EC109细胞裸鼠移植瘤生长有抑制作用，其机制与降低的c-FLIP-mRNA和蛋白表达、抑制移植瘤细胞的增殖活性及促进肿瘤细胞凋亡有关。     

维生素E对不同糖浓度培养LO2细胞铁代谢相关蛋白表达的影响

目的探讨维生素E对不同浓度葡萄糖培养下LO2肝细胞株铁调节蛋白1(IRP1)、转铁蛋白受体1(TfR1)、转铁蛋白受体2(TfR2)、铁调素(hepcidin)表达的影响。方法 LO2细胞培养基分为5.5,15,25 mmol/L三种葡萄糖浓度。分别在这三种葡萄糖浓度培养中,再分别加入0,0.1,1 mg/L和10 mg/L维生素E。其中0 mg/L维生素E剂量组作为相同葡萄糖浓度组中的对照组。各组培养时间均为24 h。用荧光染色法检测各组细胞活性氧(ROS)水平,用蛋白免疫印迹法检测IRP1、TfR1、TfR2、hepcidin的表达量。结果①相同葡萄糖浓度组与0 mg/L维生素E对照组相比,5.5 mmol/L组添加各剂量维生素E后细胞ROS水平、IRP1、TfR1和TfR2表达没有显著差异(P>0.05);15 mmol/L组和25 mmol/L组中1 mg/L和10 mg/L维生素E组分别与其对照组相比,细胞ROS水平、IRP1、TfR1和TfR2表达分别下降(P<0.01);15 mmol/L和25 mmol/L组中0.1 mg/L维生素E组与相应对照组相比细胞ROS水平、IRP1、TfR1和TfR2表达没有显著差异(P>0.05)。②相同剂量维生素E组内:LO2细胞ROS水平、IRP1、TfR1、TfR2表达量分别随葡萄糖浓度的升高而逐渐升高(P<0.01)。③在各葡萄糖浓度组内,各剂量维生素E组间细胞的hepcidin表达没有显著性差异(P>0.05)。在各剂量维生素E组中,15 mmol/L和25mmol/L葡萄糖组与相应5.5 mmol/L葡萄糖组相比,hepcidin表达显著升高(P<0.01),而15 mmol/L和25 mmol/L组间hep-cidin表达没有显著差异(P>0.05)。结论维生素E能够降低高糖培养下细胞活性氧的含量,缓解IRP1、TfR1、TfR2蛋白表达增加的幅度。hepcidin表达变化并没有受维生素E的影响,提示hepcidin在高糖环境下的表达增加可能不是或不仅仅是受过量ROS的影响。     

生存素反义寡核苷酸对肝细胞癌细胞中生存素基因表达的影响

目的检测生存素(survivin)反义寡核苷酸对肝细胞癌细胞中生存素基因及蛋白表达的影响。方法将生存素反义寡核苷酸(ASODN)分为150、500和1000nmol/L3个不同浓度的亚组对SMMC-7721细胞进行转染,并设正义寡核苷酸(SODN)组、空脂质体组及空白组作为对照组。采用逆转录—聚合酶链反应(RT-PCR)方法检测各组中生存素mRNA的表达,采用流式细胞术(FCM)检测各组中生存素蛋白的表达。结果各ASODN亚组生存素mRNA及生存素蛋白的表达量均低于各对照组(P<0.05或P<0.01)。各ASODN亚组间比较,差异有统计学意义(P<0.05或P<0.01),并呈现剂量依赖性。SODN组、空脂质体组及空白组组间比较,差异均无统计学意义(P>0.05)。结论利用生存素反义寡核苷酸转染SMMC-7721细胞,可以下调生存素mRNA及其蛋白的表达。     

survivin反义寡核苷酸对肝癌耐药细胞的作用及与化疗的关系

目的研究survivin反义寡核苷酸对人肝癌耐药细胞株的增殖和凋亡情况,以及对阿霉素化疗敏感性的影响。方法将人肝癌耐药细胞系SMMC-7721/ADM分为脂质体转染组、阿霉素组、正义寡核苷酸转染组、正义寡核苷酸转染 阿霉素组、反义寡核苷酸转染组、反义寡核苷酸转染 阿霉素组共6组。MTT法检测细胞相对存活率,流式细胞仪分析细胞凋亡率变化,RT-PCR和Westernblot印迹法检测细胞survivinmRNA和蛋白表达。结果survivin-ASODN作用后的人肝癌耐药细胞SMMC-7721/ADM的细胞凋亡率明显增高(P<0.05)。survivinmRNA和survivin蛋白表达:脂质体转染对照组、阿霉素组、正义寡核苷酸转染对照组、正义寡核苷酸转染对照 阿霉素组之间survivin蛋白表达无明显差异(P>0.05)。400ng/mlsurvivingASODN组和400ng/mlASODN 阿霉素组survivinmRNA较其他4组显著降低(P<0.05),但其两组之间表达无明显差异(P>0.05)。结论survivin反义寡核苷酸能降低肝癌耐药细胞survivin表达,增强人肝癌耐药细胞对阿霉素的化疗敏感性。     

生存素反义寡核苷酸对人子宫内膜癌细胞增殖的抑制作用

 目的 探讨生存素（survivin）反义寡核苷酸（antisense oligonucleotide,ASODN）对人子宫内膜癌细胞HEC-1B增殖的抑制作用。方法 实验分空白对照组（control组）、单纯脂质体对照组（Lip组）、正义链转染对照组（SODN组）、ASODN转染组（ASODN组）4组。人工合成正、反义寡核苷酸,经脂质体将survivin正、反义寡核苷酸转染入子宫内膜癌细胞48 h后收集各组细胞。免疫印迹（Western blot）法检测各组细胞生存素表达情况,流式细胞仪检测各组细胞凋亡率,四甲基偶氮唑蓝试验（MTT）法检测细胞生长抑制情况。结果 脂质体介导生存素反义寡核苷酸转染后的子宫内膜癌细胞出现生存素蛋白表达明显下降;ASODN转染组细胞凋亡率和增殖抑制率均明显高于各对照组（P<0.05）,而各对照组间差异无统计学意义（P>0.05）。结论 生存素反义寡核苷酸转染子宫内膜癌细胞能下调生存素蛋白表达,诱导子宫内膜癌细胞凋亡,抑制细胞增殖,对子宫内膜癌是一种有效的基因疗法。     

血管内皮生长因子C在胰腺癌中的表达及其对淋巴结转移的影响

目的 观察血管内皮生长因子C(VEGF-C)在人胰腺癌组织及胰腺癌裸鼠原位种植瘤模型中的表达特点,及其表达抑制后对胰腺癌细胞淋巴结转移的影响.方法 采用免疫组织化学染色法检测15例人胰腺癌原发灶和转移淋巴结组织中VEGF-C的表达差异.建立人胰腺癌细胞株PANC-1裸鼠原位种植瘤模型,原代培养原发和淋巴结转移灶中胰腺癌细胞,应用逆转录聚合酶链反应(RT-PCR)、酶联免疫吸附实验(ELISA)、流式细胞术、原位末端标记法(TUNEL)进一步检测VEGF-C的表达差异,并通过VEGF-C反义寡核苷酸(ASODN)体内外转染抑制其表达,研究对淋巴结转移胰腺癌细胞凋亡的影响.结果 人胰腺癌淋巴结转移组织中VEGF-C的表达水平明显高于原发组织(8.6±3.4比4.6±2.8,P<0.05);而种植瘤模型中淋巴结转移胰腺癌细胞VEGF-C的表达水平也显著高于原发灶细胞[mRNA:0.87±0.11比0.61±0.15,蛋白:(1682±157)pg/ml比(1404±128)pg/ml,均P<0.05].体内外转染VEGF-C ASODN抑制其表达后,空白对照组、错义核苷酸组、ASODN组淋巴结转移胰腺癌细胞的凋亡率均显著提高[(2.8±1.0)%,(5.0±2.1)%,(13.2±2.2)%,均P<0.01],而原发灶胰腺癌细胞无明显影响[(1.8±0.5)%,(2.0±0.7)%,(4.4±1.0)%,均P>0.05].结论 在人胰腺癌组织及动物模型中,淋巴结转移灶胰腺癌细胞VEGF-C的表达均明显高于原发灶,并且其表达下调能特异性促进淋巴结转移胰腺癌细胞的凋亡.     

VEGF反义寡核苷酸对人胆囊癌细胞VEGF、Flt-1及KDR mRNA和蛋白水平表达的影响

目的 体外研究Oligofectamine介导的血管内皮生长因子（VEGF）反义寡核苷酸（ASODN）转染对人胆囊癌细胞VEGF、Fit-1及KDR在mRNA和蛋白水平的表达及生长增殖和凋亡的影响。方法运用Oligofectamine介导的VEGFASODN和SODN转染人胆囊癌细胞GBC-SD,半定量RT-PCR检测各组细胞VEGF、Fit-1及KDRmRNA转染前后不同时间的表达变化、ELISA测定转染后各组细胞培养上清液VEGF蛋白浓度。结果ASODN组及ASODN＋Oligofectamine组都能显著抑制VEGF、Fit-1及KDRmRNA的表达,且VEGFASODN＋Oligofectamine的抑制作用比ASODN更强（P〉0．05）。ELISA测定结果显示ASODN组及ASODN＋Oligofectamine组均抑制VEGF蛋白的分泌（P〈0．05）,且ASODN＋Oligofectamine组的VEGF蛋白浓度低于ASODN组（P〉0．05）。结论VEGFASODN能抑制人胆囊癌细胞VEGF、Fit-1和KDR在mRNA水平的表达和VEGF蛋白的表达,从而促进GBC-SD细胞的凋亡;Oligofectamine能明显增强VEGFASODN的抑制效果。     

全反式维甲酸诱导K562细胞分化过程中线粒体铁蛋白表达的研究

目的 研究K562白血病细胞在全反式维甲酸(ATRA)诱导分化过程中线粒体铁蛋白(MtF)、运铁蛋白受体1(TfR1)和铁蛋白(Fn)mRNA表达水平的变化情况,探讨MtF在白血病细胞增殖和铁代谢方面的作用.方法 K562细胞加入ATRA(终浓度1 μmol/L)中诱导培养,分别于第1、3、5 d收集细胞,分别进行:①瑞士染色观察各时间点的细胞形态;流式细胞学检测细胞表面分化抗原CD13的表达;②Trizol法提取各时间点细胞的RNA,通过半定量RT-PCR方法 检测各时点MtF、TfR1和Fn基因的表达水平.同时设未用ATRA诱导培养的K562细胞为对照组.结果 1 μmol/L的ATRA可诱导K562细胞向粒系细胞分化,诱导培养第5 d,细胞表面CD13的表达水平增加,诱导分化率为21.2%,与对照组比较,差异有统计学意义(P＜0.05).诱导分化前K562细胞即有MtF mRNA表达,但随细胞诱导时间的延长,MtF和TfR1 mRNA表达呈下降趋势,诱导分化第5 d的表达水平分别为诱导分化前的86.5%和79.2%;而Fn mRNA的表达呈上调趋势,诱导分化第5 d表达水平为诱导分化前的1.21倍.结论 ATRA诱导K562细胞向粒系细胞分化过程中,MtF和TfR1 mRNA表达下调,而Fn mRNA表达上调,这种协调变化有助于降低细胞通过TfR1介导的铁摄取,从而抑制或影响细胞增殖潜能.     

5-ALA治疗和hTERT mRNA的反义寡核苷酸联合应用对人卵巢癌细胞的杀伤作用及其机制

目的：观察5-氨基乙酰丙酸（5-ALA）光动力治疗（PDT）和人端粒酶催化亚单位 (hTERT) mRNA的反义寡核苷酸（ASODN)联合应用对人卵巢癌3AO细胞的增殖抑制及促凋亡作用,探讨两种方法联合应用协同促进对人卵巢癌3AO细胞的杀伤作用机制。方法：采用MTT法筛选不同浓度5-ALA 和激光能量照射对人卵巢癌3AO细胞增殖抑制作用的最佳组合参数; RT-PCR法检测hTERT ASODN和SODN转染后hTERT mRNA表达水平的变化。将人卵巢癌3AO细胞分为空白
对照组、hTERT ASODN转染组、hTERT SODN转染组、5-ALA PDT组、hTERT ASODN转染+5-ALA PDT组和hTERT SODN转染+5-ALA PDT组,应用MTT法检测各组人卵巢癌3AO细胞增殖抑制率;应用膜联蛋白V-硫氰酸荧光素(AnnexinV-FITC)/碘化丙啶(PI)双染色结合流式细胞术检测
各组人卵巢癌3AO细胞凋亡率。结果：5-ALA PDT对人卵巢癌3AO细胞的增殖抑制作用随着光敏剂浓度的增加和激光能量的增大而增加(P<0.05);不同浓度hTERT ASODN转染人卵巢癌3AO细胞24 h后,hTERT mRNA表达水平呈浓度依赖性下调(P<0.05),而hTERT-SODN对人卵巢癌3AO细胞hTERT mRNA表达无显著影响(P>0.05)。hTERT ASODN转染+5-ALA PDT (5-ALA浓度为0.5 mmol•L-1,激光能量密度为2.50 J•cm-2)组人卵巢癌3AO细胞的增殖抑制率高于5-ALA PDT组和hTERT ASODN组(P<0.05)。hTERT ASODN转染+5-ALA PDT组人卵巢癌3AO细胞的凋亡率为29.28％,显著高于hTERT ASODN 转染组（12.79％）和5-ALA PDT组（21.19％)(P<0.05）。结论：hTERT ASODN转染与5-ALA PDT联合治疗可协同增强对人卵巢癌3AO细胞的增殖抑制作用,其机制可能与联合作用促进细胞凋亡有关联。