IL-8通过激活PI3K/AKT通路促进结肠癌细胞增殖、迁移和侵袭

为研究IL-8对结肠癌细胞增殖、迁移和侵袭的影响并探讨其作用机制,应用免疫组织化学法检测结肠癌组织和正常癌旁组织中IL-8的表达;MTT法检测不同浓度IL-8处理或抑制PI3K/AKT信号通路后结肠癌细胞SW480的增殖情况;Western blotting检测IL-8处理后SW480细胞中p-AKT、t-AKT蛋白的表达;Transwell法检测抑制PI3K/AKT通路或IL-8处理后SW480细胞的迁移和侵袭能力。结果显示,与癌旁组织相比,结肠癌组织中IL-8的表达水平明显提高;IL-8处理后SW480细胞的增殖、迁移和侵袭能力明显增加,且PI3K/AKT通路异常激活;抑制PI3K/AKT通路可逆转IL-8对SW480细胞增殖、迁移和侵袭的促进作用。由此IL-8可促进结肠癌细胞增殖、迁移和侵袭,其机制可能与激活PI3K/AKT通路有关,可为IL-8在结肠癌中的治疗提供参考。     

结直肠癌组织和SW480细胞系中SKA3蛋白的表达及对PI3K/AKT信号通路的影响

目的探讨结直肠癌组织中SKA3的表达及临床意义,观察转染SKA3-siRNA对结直肠癌SW480细胞增殖、迁徙的影响及在PI3K/AKT信号通路中的作用。方法采用免疫组化法观察69例结直肠癌和癌旁组织中SKA3蛋白的表达水平。结直肠癌SW480细胞转染SKA3-siRNA干扰后,应用Western blot法观察细胞中SKA3蛋白的表达;MTT法和细胞克隆实验观察细胞增殖改变,细胞划痕法观察细胞迁徙改变,Western blot法检测PI3K/AKT信号通路蛋白在细胞中的表达。结果结直肠癌组织中的SKA3表达水平比癌旁组织显著增加(P0.01),且SKA3蛋白表达水平与结直肠癌分化程度、淋巴结转移等有关(P0.05);结直肠癌SW480细胞转染SKA3-siRNA后,SKA3表达水平明显降低(P0.05);同时,结直肠癌SW480细胞增殖能力受抑,迁徙能力降低(P0.05);p-AKT、p-PI3K蛋白水平显著下降(P0.05)。结论 SKA3在结直肠癌中呈高表达,与患者预后相关;敲减SKA3表达可抑制结直肠癌SW480细胞的增殖和迁徙,其机制可能与抑制PI3K/AKT信号通路有关。     

RBMS3抑制宫颈癌细胞增殖和转移的作用机制研究

目的 研究RNA结合基序单链相互作用蛋白3(RBMS3)对宫颈癌细胞增殖和转移的影响,并探讨其发挥作用的可能机制.方法 采用GEPIA网站分析RBMS3在宫颈癌组织中的表达情况.qRT-PCR和Western blotting检测RBMS3 mRNA和蛋白在宫颈癌组织和细胞系中的表达水平.构建RBMS3过表达慢病毒,感染宫颈癌细胞系Caski,分为NC组和oe-RBMS3组,采用MTS检测各组细胞增殖能力,Transwell实验检测各组细胞转移能力,移植瘤实验检测各组细胞体内成瘤能力.Western blotting检测各组细胞中Wnt/β-catenin信号通路关键蛋白wnt3a、β-catenin及其下游靶蛋白cMYC、cyclinD1、MMP-2的表达.结果 GEPIA网站分析结果显示RBMS3 mRNA在宫颈癌组织中的表达显著低于在正常宫颈组织中的表达.qRT-PCR和Western blotting结果均显示RBMS3 mRNA和蛋白在宫颈癌组织中的表达显著低于其在癌旁组织中的表达,RBMS3 mRNA和蛋白在宫颈癌细胞系中的表达显著低于其在人鳞状上皮永生化细胞H8中的表达.与NC组相比,oe-RBMS3组Caski细胞增殖、转移和体内成瘤能力均降低,细胞中wnt3a、β-catenin、cMYC、cyclinD1、MMP-2蛋白表达均降低.结论 RBMS3可能通过调控Wnt/β-catenin信号通路抑制宫颈癌细胞增殖和转移能力.     

miR-23a和ESRP1在直肠癌中的作用

目的:研究miR-23a和上皮剪接调节蛋白1(epithelial splicing regulatory protein 1,ESRP1)在直肠癌组织及细胞系中的表达,以及对体外直肠癌细胞活力和凋亡的作用。方法:采用RT-q PCR分析miR-23a在36例直肠癌组织和癌旁组织中的表达,免疫组化检测ESRP1在直肠癌组织中的表达,分析miR-23a和ESRPl在直肠癌组织中的相关性;利用RT-q PCR检测miR-23a在直肠癌Caco-2和SW480细胞及人正常结肠上皮细胞株NCM460中的表达;合成miR-23a inhibitor和inhibitor阴性对照(inhibitor NC),并将其分别转染至SW480细胞后,通过CCK-8法检测miR-23a inhibitor转染SW480细胞后对细胞活力的影响,流式细胞术检测转染后细胞凋亡率,Transwell小室实验检测细胞侵袭;通过Western blot技术检测SW480细胞中ESRPl蛋白的表达;构建野生型pGL3-ESRP1-3’UTR(wt-pGL3-ESRP1-3’UTR)或突变型pGL3-ESRP1-3’UTR(mut-pGL3-ESRP1-3’UTR)质粒,并分别与miR-23a inhibitor或inhibitor NC共转染至HEK293和SW480细胞中,利用双萤光素酶报告基因检测试剂盒说明检测双萤光素酶活性;将ESRP1 mimic或mimic NC瞬时转染SW480细胞后,CCK-8法和流式细胞术分别检测细胞活力和凋亡;Western blot法检测瞬转ESRP1 mimic后对ESRP1、caspase-3、Smac和XIAP蛋白表达的影响。结果:miR-23a和ESRP1在直肠癌组织的表达较癌旁正常组织分别上调和下调,两者呈明显负相关(P0.01);miR-23a的表达与直肠癌的淋巴结转移和肿瘤浸润深度相关;与NCM460细胞相比较,miR-23a在SW480细胞中的表达量显著上调(P0.01);转染miR-23a inhibitor后,SW480细胞活力较inhibitor NC组显著下降(P0.01);转染miR-23a inhibitor后SW480细胞早期凋亡率明显升高,同时细胞体外侵袭能力受到抑制;萤光素酶报告基因结果表明ESRP1是miR-23a的直接靶基因;转染miR-23a inhibitor至SW480细胞后ESRP1蛋白表达水平明显升高;ESRP1 mimic转染SW480细胞后可抑制细胞活力并诱导细胞凋亡,同时上调caspase-3和Smac的表达,下调XIAP的表达。结论:miR-23a可通过负向调控下游靶基因ESRP1从而影响直肠癌细胞生长和凋亡。     

上调miR-433表达抑制结直肠癌细胞系增殖

目的研究miR-433在结直肠癌中的表达,并初步探讨其功能。方法选择不同分期结直肠癌癌组织(CRC)、癌旁组织与正常结直肠组织,用实时定量PCR检测miR-433表达并比较;体外培养结直肠癌细胞系HT-29、HCT-116和SW480以及正常结直肠细胞系NCM460,用实时定量PCR检测miR-433表达。随后将miR-433模拟物转染SW480细胞,CCK-8法检测细胞增殖;划痕实验检测细胞迁移;Transwell小室法检测细胞侵袭;流式细胞测量术检测细胞周期。结果与癌旁组织相比,miR-433在结直肠癌组织中表达显著降低(P0.05)。在结肠癌患者血清中miR-433水平也显著低于健康人群(P0.05)。此外,从TNM分期Ⅰ期～Ⅳ期,结直肠癌组织内miR-433表达逐渐降低(P0.05)。与NCM460相比,HT-29、HCT-116和SW480中,miR-433表达下调(P0.05)。SW480转染miR-433模拟物后,与对照miRNA组相比,在SW480细胞增殖水平明显降低(P0.05),G_2和M期细胞比例增多。上调miR-433后,细胞侵袭和迁移明显减弱(P0.05)。结论 miR-433在结直肠癌中表达降低。在SW480细胞中上调其表达后,可抑制细胞系增殖、侵袭与迁移。     

AEG1蛋白在结肠癌细胞中表达异常及其调控IL-6/STAT3通路影响结肠癌增殖和凋亡的机制研究

目的探讨星形细胞上调基因1(AEG1)在结肠癌细胞中的表达及其调控IL-6/STAT3通路影响结肠癌增殖和凋亡的潜在机制。方法 RT-qPCR检测人正常结肠黏膜上皮细胞株NCM460和结肠癌细胞株SW480、HCT116中AEG1 m RNA表达,Western blot实验检测AEG1蛋白表达。将结肠癌SW480细胞随机分为5组:对照组、SH5-07处理组、si-NC组(siRNA干扰对照组)、si-AEG1组(siRNA干扰AEG1组)和si-AEG1+IL-6组,MTT法检测各组细胞增殖活性,流式细胞术检测各组细胞凋亡情况,Western blot检测各组细胞中IL-6、STAT3、p-STAT3蛋白表达。结果与NCM460细胞相比,结肠癌SW480、HCT116细胞中AEG1 mRNA和蛋白表达均升高(P0.05);与si-NC组比较,si-AEG1组结肠癌SW480细胞增殖活性降低(P0.05),细胞凋亡率升高(P0.05),细胞中IL-6、STAT3、p-STAT3蛋白表达水平降低(P0.05);与对照组比较,SH5-07组结肠癌SW480细胞增殖活性降低(P0.05),细胞凋亡率升高(P0.05);与si-AEG1组比较,si-AEG1+IL-6组结肠癌SW480细胞增殖活性增强(P0.05),细胞凋亡率降低(P0.05)。结论在结肠癌细胞中干扰AEG1的表达,能通过抑制IL-6/STAT3信号通路进而抑制结肠癌细胞增殖并诱导细胞凋亡。     

过表达miR-5195-3p对结直肠癌细胞凋亡的影响

目的探讨miR-5195-3p对Runx相关转录因子3(RUNX3)的靶向调节作用及对结直肠癌细胞凋亡的影响。方法 RT-qPCR和Western blot分别检测结直肠癌组织与癌旁组织中miR-5195-3p和RUNX3蛋白的表达。将人结肠癌细胞系SW480随机分为5组:对照组(control)、miR-5195-3p mimic组、mimic control组、miR-5195-3p inhibitor组、inhibitor control组。Wetsern blot检测RUNX3的蛋白表达;流式细胞仪检测细胞凋亡。在SW480细胞中转染RUNX3过表达质粒后检测细胞凋亡。结果与癌旁组织中相比,miR-5195-3p在结直肠癌组织中的表达显著升高,RUNX3的蛋白表达明显降低(P0.05)。过表达miR-5195-3p显著下调了SW480细胞中RUNX3的表达,并降低细胞凋亡水平(P0.05);抑制miR-5195-3p明显上调RUNX3的表达,并上调细胞凋亡水平(P0.05)。此外与miR-5195-3p mimic组相比,RUNX3过表达质粒的共转染组显著降低细胞凋亡水平(P0.05)。结论 miR-5195-3p可能作为促癌基因在结直肠癌中发挥作用,其作用与靶向调节RUNX3相关。     

lncRNA RAB11B-AS1对结直肠癌SW480细胞增殖、侵袭、迁移及凋亡的影响

目的探讨lncRNA RAB11B-AS1对结直肠癌SW480细胞增殖、侵袭、迁移及凋亡的影响及可能机制。方法 qRT-PCR方法检测34例结直肠癌组织及相应的癌旁组织、人正常结肠黏膜上皮细胞NCM460与人结直肠癌细胞株SW480中lncRNA RAB11B-AS1的表达水平。构建稳定过表达RAB11B-AS1的SW480细胞系,MTT方法检测SW480细胞的增殖能力变化;流式细胞术检测SW480细胞凋亡率;Transwell检测SW480细胞侵袭能力变化,划痕实验检测SW480细胞迁移能力变化;Western blot检测SW480细胞中细胞周期蛋白1(cyclin D1)和CDK6的表达水平。结果 RAB11B-AS1在结直肠癌组织中的表达显著低于癌旁组织(P0.01);在SW480中的表达显著低于NCM460细胞(P0.01)。RAB11B-AS1过表达后,SW480细胞的增殖、侵袭与迁移能力显著降低,凋亡率显著升高,cyclin D1与CDK6的蛋白表达降低(P0.01)。结论 lncRNA RAB11B-AS1在结直肠癌组织中表达降低,过表达RAB11B-AS1能够抑制SW480细胞的增殖、迁移与侵袭,并促进凋亡。     

1α,25-二羟基维生素D3抑制人结肠癌细胞系SW480中β-catenin转录活性

目的探讨1α,25-二羟基维生素D_3[1,25(OH)_2D_3]对人结肠癌细胞系SW480中β-catenin转录活性的影响及作用机制。方法 1,25(OH)_2D_3(100 nmol/L)干预和溶剂对照处理SW480细胞48 h;用双荧光素酶报告系统检测β-catenin的转录活性;Western blot检测1,25(OH)_2D_3干预后β-catenin在细胞核/质内的定位变化;用RT-qPCR和Western blot检测β-catenin和FOXM1 mRNA及蛋白水平。采用siRNA敲降SW480细胞中FOXM1后,检测1,25(OH)_2D_3干预后β-catenin转录活性的变化。结果 1)在SW480细胞中,1,25(OH)_2D_3能显著降低β-catenin的转录活性(P0.05),但不影响β-catenin mRNA和蛋白表达水平; 2)1,25(OH)_2D_3上调SW480细胞中FOXM1蛋白水平的表达(P0.05); 3)敲降SW480细胞中FOXM1降低1,25(OH)_2D_3对β-catenin转录活性的抑制作用(P0.05)。结论 1,25(OH)_2D_3通过上调FOXM1的表达,发挥抑制β-catenin转录活性的作用。     

慢病毒介导的GHSR1a shRNA对结直肠癌细胞生长的影响

目的:构建生长激素促泌素受体1a(growth hormone secretagogue receptor 1a,GHSR1a)基因短发夹干扰RNA(short hairpin RNA,shRNA)慢病毒载体,感染人结直肠癌细胞系SW480,观察沉默GHSR1a基因对SW480细胞生长的影响,并探讨其作用机制。方法:构建特异性靶向GHSR1a基因的shRNA慢病毒表达载体和阴性对照序列慢病毒载体;建立稳定表达GHSR1a shRNA的SW480细胞、阴性对照细胞(NC)及空白对照细胞(BC),RTPCR检测GHSR1a的mRNA在细胞中的表达;通过Western blot技术检测细胞中GHSR1a、ghrelin、PTEN、p-AKT及p53蛋白的水平;CCK-8法测定GHSR1a shRNA对SW480细胞活力的影响;建立裸鼠结直肠癌皮下移植瘤模型,实验结束后处死裸鼠并测量各组裸鼠肿瘤重量;免疫组织化学法检测肿瘤组织中Ki-67和PTEN的阳性表达。结果:在体外实验中,GHSR1a在人结直肠癌细胞株Caco-2及SW480中的表达明显高于人正常结肠上皮细胞株NCM460的表达;成功建立了稳定表达GHSR1a shRNA的SW480细胞;GHSR1a shRNA能明显抑制SW480细胞GHSR1a mRNA及蛋白的表达;沉默GHSR1a基因后SW480细胞活力明显减弱;与NC组相比较,GHSR1a shRNA组细胞中PTEN mRNA及蛋白水平上调,AKT磷酸化被抑制,p53的表达明显增加;在体内实验中,与NC组相比较,GHSR1a shRNA组裸鼠结直肠癌皮下移植瘤重量明显减轻,同时Ki-67表达下调,PTEN表达上调。结论:慢病毒介导的GHSR1a shRNA对体内、外人结肠癌细胞的生长有明显抑制作用,该作用可能通过上调PTEN及其下游PI3K/AKT通路实现。     

Modes of reinforcement and gender and culture of experimenter and subject: effects of "alien" and external reinforcement for Japanese and American men and women

In this study, we examined external and "alien" reinforcement (ER and AR. respectively) as a factor in social learning, and studied the combined effects of culture and reinforcement mode. A female (Experiment 1) and a male (Experiment 2) experimenters conducted experimental sessions. Both men and women, who grew up in the same culture as the experimenter, participated and performed the experimental task. A three-way interaction effect of experimenter gender, culture, and reinforcement mode was found on task performance. And the effect was more pronounced for a Japanese experimenter. A female and a male experimenters conducted Experiments 3 and 4, respectively; however participants this time were men and women who grew up in different cultures than the experimenter. Results indicated that the pattern of the subject gender and reinforcement mode interaction effect, when the experimenter was Japanese with American subjects, was exactly opposite to that when the experimenter was American. These experiments showed that AR was as effective for social learning as ER, and that the cultural backgrounds of experimenter and subject influenced AR and ER effectiveness.     

Rates of oxygen consumption and of anaerobic glycolysis in renal cortex and medulla of adult and new-born rats and guinea-pigs

1. Rates of oxygen uptake and of anaerobic glycolysis were estimated in slices from the renal cortex and medulla (a) of adult rats and guinea-pigs, (b) of new-born (1-, 5- and 21-day-old) rats and of guinea-pigs of 1, 12, 21, 24 and 120 hr age.2. In the adult rat, Q(O2) values for the cortex were 12.55 +/- 0.20 (22) and for the medulla: 8.56 +/- 0.17 (22) mul./hr.mg dry weight, while in the new-born rat (24 hr old) they were 10.99 +/- 0.46 (12) and 9.33 +/- 0.18 (9) mul./hr.mg dry weight respectively.3. Values for Q(CO2) (N2) (anaerobic glycolysis) in the 14 hr old new-born rat were in the renal cortex 9.65 +/- 0.35 (5) and in the medulla 7.39 +/- 0.43 (5) mul./hr.mg dry weight; while in the adult they were 2.25 +/- 0.08 (16) and 5.76 +/- 0.14 (16) mul./hr.mg dry weight, respectively.4. In the adult guinea-pig values for Q(CO2) (N2) were of the same order as in the adult rat, though the rate of O(2) uptake was for the cortex 8.12 +/- 0.22 (12) and for the medulla 5.02 +/- 0.23 (11) mul./hr.mg dry weight.5. Though the Q(O2) values in the renal cortex and medulla were smaller in the 1 hr old new-born guinea-pig, they were already increasing in the 12 hr old neonate.6. The results are discussed in the light of enzyme changes occurring during the process of maturation of the nephron as indicated by histochemical observations.     

Timing and intensity of early fevers and the development of allergies and asthma

BACKGROUND: Early childhood fevers appear to protect against later allergies and asthma. What is not known is the time in which fevers exert this effect and whether the degree of temperature increase is important. OBJECTIVE: We sought to examine the relationship between the time and degree of early fevers and later allergies and asthma. METHODS: Eight hundred thirty-five children from southeast Michigan were enrolled at birth. Clinic records from their first 2 years were abstracted for episodes of fever. At age 6 to 7 years, children underwent allergy testing. We examined fevers occurring within 6-month intervals in the first 2 years of life and outcomes at age 6 to 7 years. The primary outcome measures were allergic sensitization, asthma, asthma with allergic sensitization, and asthma without allergic sensitization. RESULTS: In the unadjusted analysis each episode of fever between 7 and 12 months of age was associated with a lower odds of allergic sensitization (odds ratio [OR], 0.71; 95% CI, 0.54-0.93) and asthma with allergic sensitization (OR, 0.43; 95% CI, 0.21-0.90) at age 6 to 7 years. Likewise, every 1 degrees C increase in the maximum temperature between 7 and 12 months was associated with a lower odds of allergic sensitization (OR, 0.77; 95% CI, 0.61-0.96) and asthma with allergic sensitization (OR, 0.62; 95% CI, 0.40-0.94). After adjusting for potential confounders, each episode of fever between 7 and 12 months was associated with a lower likelihood of asthma with allergic sensitization (adjusted OR, 0.33; 95% CI, 0.11-0.94) at age 6 to 7 years. CONCLUSIONS: Both the timing and intensity of childhood fevers appear to be important factors in the development of allergies and asthma.     

纳米水平分子成像与诊疗一体化研究进展与挑战

分子成像能以非侵入性的方式重现活体细胞的生理功能和生物学过程,提高疾病的早期和特异性诊断水平。纳米颗粒/材料具有物理性质可控性高、易于表面修饰、血液循环时间长和可功能化等优点,在疾病诊断与治疗中显示出巨大潜力。但如何阐明纳米材料多功能间的内在联系、解决其代谢及安全性等关键机制难题、实现纳米颗粒/材料多功能性到临床多功能...