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1.
廖鹏  程远 《第三军医大学学报》2011,33(20):2153-2156
目的探讨热休克蛋白B1(heat shock protein B1,HSPB1)在U251细胞株及其干细胞中差异性表达对肿瘤细胞凋亡的影响。方法采用无血清培养基培养U251细胞,获得U251干细胞;应用细胞免疫荧光染色法检测CD133和nestin鉴定胶质瘤干细胞;应用iTRAQ技术对U251细胞株及其干细胞进行HSPs差异性分析;应用MTT法、Western blot和RT-PCR观察经卡莫司汀干预后,肿瘤细胞凋亡与HSPB1蛋白、基因表达变化的关系。结果在未经卡莫司汀干预的胶质瘤与胶质瘤干细胞的HSPB1的蛋白比值为0.523;经卡莫司汀干预U251及其干细胞后,HSPB1蛋白含量分别升高了1.4、3.3倍,HSPB1 mRNA分别升高1.5、3.6倍,经相同浓度的卡莫司汀干预后的U251细胞生长受到抑制,而U251干细胞无明显抑制。结论 HSPB1参与U251胶质瘤干细胞化疗抵抗过程,对肿瘤细胞增殖、凋亡起着重要的调控作用。  相似文献   

2.
目的:初步探讨Bmi-1基因对胶质瘤细胞凋亡状况的影响?方法:采用siRNA技术干扰沉默U251胶质瘤细胞中Bmi-1基因,RT-PCR法检测干扰效果,流式细胞仪检测U251细胞的凋亡状况, one way ANOVA 和t检验进行统计学分析?结果:RT-PCR显示U251细胞RNA干扰组Bmi-1 mRNA凝胶电泳条带呈弱阳性, 阴性对照组和未处理组Bmi-1 mRNA条带呈强阳性,灰度比统计分析,差异具有统计学意义,siRNA可以明显降低U251细胞中Bmi-1基因的表达;流式细胞仪显示干扰组U251细胞的凋亡率为(32.53±6.33)%,高于阴性对照组的凋亡率(21.91±5.63)%,统计分析其差异具有统计学意义?结论:Bmi-1基因可以抑制胶质瘤细胞的凋亡,有可能促进了胶质细胞瘤的发生?发展?  相似文献   

3.
目的探讨细胞耐药后干细胞因子Nanog表达及侵袭力的改变。方法脑胶质瘤细胞系U251卡莫司汀干预后通过RT-PCR检测干预前后细胞中Nanog在mRNA的水平表达情况,通过Transwell体外侵袭实验检测卡莫司汀干预前后侵袭力的改变。结果脑胶质瘤细胞系U251卡莫司汀干预5d后干细胞基因Nanog mRNA表达增高,卡莫司汀干预后穿膜细胞数高于干预前的细胞数(P<0.05)。结论卡莫司汀只能杀死普通肿瘤细胞,而肿瘤干细胞却相对增加,这是生长增殖、耐药和侵袭转移的主要原因。  相似文献   

4.
目的:研究缺氧诱导因子-1α(H IF-1α)反义寡核苷酸(ASODN)转染对人胶质瘤细胞增殖及凋亡的影响,探讨以H IF-1α为靶点进行反义寡核苷酸转染治疗胶质瘤的有效性。方法:设计合成针对H IF-1α的寡核苷酸片段.实验分6组:空白对照组、脂质体组、正义组和反义组(1.0μmol/l、2.5μmol/l和5.0μmol/l)。利用脂质体包裹瞬时转染人胶质瘤细胞系U251,MTT法检测细胞增殖;采用AO/EB染色及末端标记法(TUNEL)检测细胞凋亡的变化。结果:转染后各组细胞增殖抑制率分别为(1.30±0.05)%、(1.98±0.35)%、(2.47±0.48)%、(22.30±2.08)%、(33.60±4.19)%和(56.20±4.22)%。转染H IF-1α反义寡核苷酸组较各对照组相比细胞增生下降,凋亡增加(P<0.01)。结论:H IF-1α反义寡核苷酸转染人胶质瘤U251细胞系可以抑制细胞增生并诱导胶质瘤细胞凋亡,H IF-1α有望成为一个极具潜力的肿瘤治疗的靶点。  相似文献   

5.
目的 观察干扰linc00152的人胶质瘤细胞株U251的增殖与侵袭情况.方法 培养胶质瘤U251细胞,将U251细胞分为观察组和对照组,观察组转染linc00152-shRNA,对照组转染control-shRNA,采用qRT-PCR法检测两组U251细胞中linc00152 mRNA的表达,采用MTT法观察两组细胞增殖能力,侵袭实验检测两组细胞的侵袭能力.结果 qRT-PCR结果显示,观察组U251细胞中linc00152的mRNA表达量为(0.313±0.020),明显少于对照组的(1.017±0.082),差异有显著统计学意义(P<0.01);MTT结果显示,观察组的U251细胞的OD值为(0.444±0.032),少于对照组的(0.679±0.052),差异具有统计学意义(P<0.05);侵袭实验结果显示,观察组穿过基质胶的U251细胞数量为(66.9±9.1),明显少于对照组的(146±12.2),差异具有显著统计学意义(P<0.01).结论 在人胶质瘤细胞株U251中敲低linc00152能抑制细胞的增殖与侵袭.  相似文献   

6.
重组人ndrg2腺病毒对胶质瘤细胞U251抑制作用的研究   总被引:1,自引:0,他引:1  
目的:研究抑癌候选基因NDRG2在体外对人脑胶质瘤细胞系U251增殖和凋亡的影响。方法:将人脑胶质瘤细胞系U251细胞分成空白对照组,重组人ndrg2腺病毒组和今又生(重组人P53腺病毒)组,重组人ndrg2腺病毒组和今又生组下设1.68×1011、8.4×1010、4.2×1010、2.1×1010、1.05×1010、5.25×109、5.25×108、5.25×107 v.p/ml组,各组分别作用96h后观察细胞形态学改变,甲基噻唑基四唑法(MTT法)绘制细胞生长抑制曲线。结果:重组人ndrg2腺病毒和今又生转染人胶质瘤细胞系U251后,细胞生长受到明显抑制,呈现明显的剂量-效应依赖曲线;重组人ndrg2腺病毒组对U251细胞的抑制率优于今又生组。结论:过表达NDRG2可明显抑制人胶质瘤细胞U251的增殖并导致细胞凋亡。  相似文献   

7.
焦庆芳  李松  刘展  游潮  王春婷 《重庆医学》2011,40(35):3594-3596,3641
目的探讨PeroxiredoxinsⅢ(PRDXⅢ)基因对人胶质瘤细胞株U251体外增殖和凋亡的影响。方法将U251细胞分为空白对照组、空载体转染组、无关序列转染组和干扰组。利用脂质体将PRDXⅢ干扰片段转染胶质瘤细胞株U251,RT-PCR及Western blot检测转染后PRDXⅢmRNA及蛋白的表达水平,流式细胞仪(FCM)、DNA ladder、PI染色检测转染后细胞的凋亡状况,四甲基偶氮唑盐(MTT)检测转染后U251细胞的生长抑制率。结果转染后干扰组PRDXⅢmRNA及蛋白的表达水平明显降低,抑制率分别为76.0%和63.9%。DNA ladder显示干扰组出现明显梯形电泳条带。PI染色结果显示干扰组细胞核的染色质高度浓染色,部分细胞核裂解为碎块。空白对照组、空载体转染组、无关序列转染组和干扰组细胞凋亡率分别为(2.26±0.64)%、(2.68±0.74)%、(3.54±0.62)%和(35.90±4.85)%,干扰组细胞凋亡率明显高于其他各组(P=0.00)。干扰组U251细胞生长抑制率为44.40%。结论 PRDXⅢ靶向干扰能够显著抑制U251细胞株增殖,增加其凋亡。  相似文献   

8.
郑艺  张帆 《中华全科医学》2018,16(5):716-720
目的 利用小分子RNA(small interfering RNA,siRNA)技术体外沉默人胶质瘤细胞COX-2基因表达,探讨其对放射敏感性的影响,以期为胶质瘤的治疗提供新的思路和方法。 方法 体外培养胶质瘤U251细胞,使用siRNA技术构建U251细胞COX-2基因沉默模型,Western blot检测转染后细胞COX-2蛋白表达情况,筛出最适序列。将实验分为对照组与转染组,分别予以2、4、6、8 Gy四个剂量组予以X线照射,实验重复3次,使用MTT法检测辐射后细胞增殖抑制情况,平板克隆形成实验检测细胞存活分数(SF)并通过单击多靶拟合曲线计算增敏比(SER),流式细胞术检测细胞凋亡情况。 结果 转染组COX-2蛋白表达情况较对照组均下降,其中以siRNA600序列降低最为明显,差异具有统计学意义(P<0.05),后续实验均以siRNA600序列进行转染。辐射后转染组的细胞增殖抑制率为(84.87±3.50)%、(63.62±0.35)%、(55.05±4.87)%、(36.85±3.00)%,较对照组增殖抑制作用明显增强,并随放射剂量增加而增加,差异具有统计学意义(P<0.05)。辐射后的转染组SF低于对照组,且转染组D0为4.110,Dq为1.387,均低于对照组,对照组D0为6.908,Dq为2.772,放射增敏比SER为1.680,差异有统计学意义(P<0.05)。辐射后的转染组细胞凋亡率为(3.63±0.45)%、(6.08±0.87)%、(47.97±2.13)%、(59.56±3.07)%均高于对照组,且在6 Gy、8 Gy照射后升高更为明显。 结论 siRNA技术沉默人胶质瘤U251细胞COX-2基因表达可以提高细胞的放射敏感性,增加了放射后细胞的凋亡率及增殖抑制作用,降低了克隆形成率。   相似文献   

9.
MGMT介导的人脑胶质瘤耐药细胞系的建立   总被引:6,自引:0,他引:6  
目的:建立由O^6-甲基鸟嘌呤-DNA甲基转移酶(MGMT)介导的人脑胶质瘤耐药细胞株U251/BCNU。方法:模拟卡氮芥(BCNU)的临床用药程序,采取恒定药物浓度、周期性使用的方式诱导U251的抗药性。检测U251/BCNU的耐药指数及MGMT mRNA的表达;比较U251及U251/BCNU细胞的体外增殖变化。结果:经过反复总共5次的用药过程,历时4个月,成功地建立了对BCNU具有稳定抗药性的U251/BCNU,其对BCNU的耐受程度约为U251的17倍。RT-PCR显示,U251/BCNU细胞有MGMTmRNA的表达。U251及U251/BCNU细胞的体外群体倍增时间差异无显著性。结论:在体外成功地建立了一株由MGMT介导的人脑胶质瘤耐药细胞系,为进一步探讨胶质瘤的耐药机制及逆转方式奠定了基础。  相似文献   

10.
目的 观察紫河车提取物联合顺铂对人脑胶质瘤细胞增殖与凋亡的影响.方法 把正常培养传代后的U251胶质瘤细胞按随机分配的方法分为四组,A组仅加普通培养液,B、C、D组各加紫河车提取物(400 mg/mL)2 mL、顺铂(1 mg/mL)0.01 mL、紫河车提取物(400 mg/mL)2 mL+顺铂(1 mg/mL)0.01 mL;MTT法观察U251细胞增殖情况,流式细胞仪检测U251细胞凋亡率.结果 培养12、24、36、48、60 h,B、C、D组细胞增殖指数逐渐下降,与A组进行比较,各组P值均小于0.05;其中,将D组与B、C组进行比较,P值小于0.05.将各组培养24 h后上机,测得A、B、C、D各组细胞的凋亡率分别为(0.3±0.2)%,(10.6±1.5)%,(35.9±2.8)%,(52.1±4.1)%.其中,B、C、D各组和A组进行比较,P值均小于0.05;将D组与B、C组两组进行比较,P值也均小于0.05.结论 紫河车提取物联合顺铂可抑制人脑胶质瘤U251细胞增殖,并诱导其凋亡.  相似文献   

11.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

12.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

13.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

14.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

15.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

16.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

19.
Objective To measure Derpl and Blot5 allergen levels in asthmatics' homes in Hongkong.Methods Seventy houses were enrolled for a mite indoor environment study. Dust samples were obtained from two sites of each patients' house: bed and floor. Derpl and Blot5 levels were quantified by a two-site monoclonal antibody-based ELISA technique.Results The levels of Derpl allergens found in bed (geometric mean (GM) 3.43 μg/g of dust; 95%CI, 1.89-4.96 μg/g)and on the floor (GM 1.12 μg/g of dust; 95%CI, 0.71-1.53 μg/g) indicated significant differences (P=0.005). However, the levels of Blot5 allergens found in bed (GM 19.00 μg/g of dust; 95%CI, 0.89-38.90 μg/g) and on the floor (GM 6.14 μg/g of dust; 95%CI, 0.40-11.90 μg/g) showed no statistically significant difference. In addition, in regards to the exposure index for Derpl and Blot5 allergens found in bed and on the floor, 17.6% in bed and 8.6% on the floor had levels of Blot5 ≥ 10 μg/g of dust, higher than those obtained for Derp1 (7.2% and 0% in bed and on the floor respectively, P< 0.05); higher percentages in bed and on the floor (25.0% and 35.7%) were observed for levels of Blot5 =0 μg/g of dust as compared with Derpl in bed and on the floor (4.3% and 14.5% respectively, P< 0.05).Conclusions Derpl and Blot5 are the major allergens found in this regional study, Blot5 is a more potent allergen in Hongkong, probably reflecting the high level of exposure to Blomia tropicalis (Bt). Bt and Dermatophagoides pteronyssinus (Dp) allergens should be included for precise diagnosis and effective immuno-therapeutic treatment of mite allergy in Hongkong.  相似文献   

20.
ANTI-PROLIFERATION EFFECT OF ORIDONIN ON HL-60 CELLS AND ITS MECHANISM   总被引:4,自引:0,他引:4  
Objcetive To investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism. Methods HL-60 cells in vitro in culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM), morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was detected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred. Results Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especially after cells were treated 48-60 hours by oridonin. Conclusions Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells in vitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.  相似文献   

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