miR-126 对结肠癌细胞生物学行为的影响及其在调控结肠癌EMT 转化中的作用

目的:观察miR-126 在不同转移潜能的人结肠癌细胞系中的表达情况及其对结肠癌细胞增殖、侵袭转移能力的影响并探讨可能的作用机制。方法:采用实时荧光定量PCR 检测结肠癌细胞系(SW480、SW620 及HCT116)中miR-126 的表达量。通过脂质体瞬时转染法将miR-126 过表达(miR-126 mimics),并设置阴性对照组,然后采用CCK8 法检测细胞的增殖能力,细胞划痕实验检测细胞的迁移能力,Transwell 侵袭小室实验检测细胞的侵袭能力,Western blot 实验检测E-cadherin 和Vimentin 蛋白表达量的变化。结果:相对于低转移潜能的结肠癌细胞株SW480,miR-126 在高转移潜能的SW620 和HCT116细胞中的表达降低。过表达miR-126 可使SW620 细胞增殖、迁移和侵袭能力降低,E-cadherin 蛋白表达增加,Vimentin 蛋白表达降低,差异具有统计学意义(P<0.05)。结论:低表达的miR-126 与结肠癌的转移密切相关,miR-126 影响结肠癌细胞生物学行为的作用可能是通过调控EMT 进程实现的。     

miR-186上调Dicer1抑制结肠癌细胞侵袭转移的分子机制

为探讨miR-186通过Dicer1影响结肠癌细胞侵袭转移及其作用机制,RT-qPCR检测miR-186在结肠癌组织及正常癌旁组织、人结肠癌细胞及正常人肠上皮细胞HIEC中的表达;荧光显微镜观察稳定过表达/下调miR-186细胞系GFP荧光并采用RT-qPCR检测miR-186表达效率;Transwell及划痕实验检测miR-186对结肠癌细胞SW620和HT29侵袭、迁移能力的影响;免疫荧光法检测上皮间质转化(epithelial mesenchymal transition, EMT)相关分子N-cadherin表达;生物信息学预测及双荧光素酶报告基因实验验证miR-186和Dicer1的靶向关系;免疫组织化学法检测Dicer1在结肠癌组织及正常癌旁组织中的表达;Western blotting检测Dicer1在各细胞株中的表达。结果显示,肿瘤组织中miR-186的表达水平显著低于正常癌旁组织(P0.05);miR-186在肿瘤细胞中的表达水平显著低于HIEC(P0.05)。转染过表达/下调miR-186慢病毒阳性质粒及阴性对照的SW620和HT29细胞均出现大量绿色荧光;RT-qPCR显示稳定过表达细胞SW620-mimic-miR-186中miR-186水平显著升高,HT29-inhibitor-miR-186中miR-186水平显著下降,分别与SW620和SW620-mimic-NC、HT29和HT29-inhibitor-NC相比差异有统计学意义(P0.05)。过表达miR-186能显著降低SW620的侵袭迁移能力,同时抑制N-cadherin水平,而下调miR-186能显著增加HT29的侵袭迁移能力。经www.microRNA.org网站预测发现miR-186和Dicer1有互补结合序列,双荧光素酶报告实验证实两者的靶向结合关系。SW620中Dicer1表达水平显著低于HIEC(P0.05);稳定过表达细胞系SW620-mimic-miR-186中Dicer1表达水平明显升高,分别与SW620和SW620-mimic-NC相比差异有统计学意义(P0.05)。由此,miR-186通过靶向正调控Dicer1的表达降低N-cadherin水平从而抑制EMT进程,最终抑制结肠癌细胞的侵袭迁移能力。     

miR-581对结直肠癌SW620细胞侵袭和转移的影响

探讨miR-581对结直肠癌SW620细胞侵袭转移能力的影响。首先,用miR-581mimics转染SW620细胞作为实验组(miR-581),用对照组mimics转染SW620细胞作为对照组(vector);用qRT-PCR检测2组细胞中miR-581的mRNA表达水平;划痕实验和transwell实验检测2组细胞迁移和侵袭能力的变化;Western blotting检测2组细胞中MMP-1和MMP-9的蛋白表达水平。结果显示,实验组细胞中miR-581表达较对照组明显增高(P0.05);划痕实验显示实验组细胞划痕愈合率较对照组减慢(P0.05),transwell结果显示实验组细胞较对照组细胞穿膜细胞数减少(P0.05);Western blotting结果显示实验组MMP-1和MMP-9的表达都较对照组降低(P0.05)。以上结果提示miR-581可以抑制SW620细胞的侵袭和转移。     

miR-377靶向ZEB2调节结肠癌细胞迁移、侵袭和上皮-间质转化北大核心CSCD

目的:探讨miR-377对结肠癌细胞迁移、侵袭的影响及潜在作用机制。方法:RT-qPCR检测结肠癌细胞系HT29、SW480、SW620和HCT116和人小肠上皮细胞HIEC miR-377表达。将miR-377 mimic、阴性对照物、pmirGLO-wt-ZEB2、pmirGLO-mut-ZEB2转染至HCT116细胞,双荧光素酶报告实验检测miR-377与ZEB2的靶向作用,伤口愈合实验、Transwell、Western blot检测miR-377和ZEB2对细胞迁移、侵袭、上皮-间质转化相关蛋白表达的影响。结果:与HIEC细胞相比,结肠癌细胞系miR-377表达降低(P<0.05)。与对照组相比,miR-377 mimic和pmirGLO-WT-ZEB2共转染的HCT116细胞荧光素酶活性显著降低(P<0.05),但ZEB2结合位点突变逆转了miR-377 mimic对荧光素酶活性的抑制作用(P>0.05);miR-377 mimic显著降低了HCT116细胞ZEB2蛋白表达(P<0.05)。与NC+Vector组相比,miR-377+Vector组细胞划痕愈合率、侵袭细胞数显著降低(P<0.05),E-cadherin蛋白表达显著升高(P>0.05),N-cadherin、Vimentin蛋白表达显著降低(P<0.05)。与miR-377+Vector组相比,miR-377+ZEB2组细胞划痕愈合率、侵袭细胞数显著高于miR-377+Vector组(P<0.05),E-cadherin蛋白表达显著降低(P<0.05),N-cadherin、Vimentin蛋白表达显著升高(P<0.05),miR-377+ZEB2组与NC+Vector组上述指标差异无统计学意义(P>0.05)。结论:miR-377通过靶向作用于ZEB2调节结肠癌细胞上皮-间质转化相关蛋白表达,进而影响结肠癌细胞迁移、侵袭,为结肠癌临床治疗提供了新的策略。     

高迁移率族蛋白B1促进结肠癌细胞增殖、迁移与侵袭的机制探讨

目的:探讨高迁移率族蛋白B1(HMGB1)在结肠癌细胞中的表达和对结肠癌细胞增殖、迁移和侵袭的影响。方法:采用qPCR与Western blot法检测人结肠癌SW620细胞与正常结肠上皮细胞FHC中HMGB1的mRNA和蛋白表达。通过Lipofectamine 3000转染质粒构建稳定下调HMGB1表达(shHMGB1)的SW620细胞,同时设置阴性对照(shNC)细胞和空白对照(blank)细胞;采用CCK-8、平板集落形成实验和Transwell实验检测细胞的增殖、迁移及侵袭能力。采用Western blot检测HMGB1表达下调对p-ERK、ERK、c-Myc、基质金属蛋白酶(MMP)-2/9、E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)、Bcl-2及Bax的蛋白表达水平的影响。结果:SW620细胞中HMGB1在mRNA及蛋白水平表达均高于正常结肠上皮细胞FHC(P0.05)。经qPCR与Western blot验证,HMGB1低表达细胞构建成功。与blank组和shNC组相比,shHMGB1组细胞增殖、迁移和侵袭能力受到显著抑制(P0.01)。Western blot结果表明,同blank组和shNC组比较,shHMGB1组细胞的MMP-2、MMP-9、N-cadherin、c-Myc、Bcl-2及ERK磷酸化蛋白表达显著下调,Bax蛋白表达显著上调(P0.05)。结论:HMGB1可促进结肠癌SW620细胞的增殖、迁移和侵袭能力,ERK/c-Myc信号通路参与了这一过程。     

miR-581 对结直肠癌SW620 细胞增殖能力的影响

目的:探讨miR-581 对结直肠癌SW620 细胞增殖能力的影响。方法:分别用携带miR-581 基因的慢病毒颗粒(LV-miR-581-GFP)和miR-581 mimics(miR-581)转染人结肠癌细胞株SW620 作为实验组;用对照组病毒颗粒(LV-GFP)和对照组mimics (Vector)转染SW620 细胞株作为阴性对照组。用实时荧光定量PCR(qRT-PCR)检测各组细胞中miR-581 的mRNA 表达水平;CCK8 和克隆形成实验检测细胞增殖能力和克隆形成能力的变化。结果:实验组SW620 细胞中miR-581 表达较对照组明显增高(P<0.05);CCK8 和克隆形成实验显示过表达实验组细胞的增殖及克隆形成能力较对照组明显增强(P<0.05)。结论:miR-581 对结直肠癌SW620 细胞的增殖具有促进作用。     

miR-145对胰腺癌细胞系PANC-1上皮间质转化及肿瘤干细胞增殖的影响

目的探讨miR-145对胰腺癌细胞系PANC-1发生上皮间质转化(EMT)及肿瘤干细胞增殖的影响及相关机制。方法设miR-145组、对照组与空白组;构建miR-145过表达慢病毒,转染到PANC-1细胞系中;用RT-q PCR法检测各组miR-145的表达;用黏附试验检测细胞黏附能力的变化,用瘤球形成实验检测胰腺癌干细胞的形成;用RT-q PCR和Western blot检测E-cadherin、N-cadherin与OCT4的mRNA和蛋白质的差异。结果转染miR-145过表达慢病毒后能够明显增加miR-145的mRNA水平(P0.05);miR-145组比对照组与空白组PANC-1细胞同种黏附能力增加、异种黏附能力降低、抑制肿瘤干细胞球数量及直径(P0.05);miR-145组相比对照组与空白组,E-cadherin表达明显增高而N-cadherin和OCT4在mRNA与蛋白质表达均明显降低(P0.05)。结论上调miR-145能够促进胰腺癌细胞系PANC-1 EMT的逆转,降低胰腺癌肿瘤干细胞特性获得,其机制可能与E-cadherin的上调及N-cadherin和OCT4的下调有关。     

miR-129抑制鼻咽癌细胞系CNE2增殖

目的检测miR-129对鼻咽癌细胞系CNE2细胞生物学功能的影响。方法人工合成miR-129模拟物(mimics)和抑制物(inhibitor),转染至鼻咽癌CNE2细胞中,RT-qPCR检测细胞miR-129表达;CCK8法检测细胞增殖;Transwell小室侵袭实验检测细胞侵袭能力;流式细胞仪检测细胞凋亡能力。结果与对照组相比,转染miR-129 mimics组的miR-129表达水平明显升高(P0.05);转染miR-129 inhibitor组的miR-129表达水平均明显降低(P0.05);与对照组相比,转染miR-129 mimics组CNE2细胞增殖能力、侵袭能力显著下降(P0.05),凋亡显著增多(P0.05);与对照组相比,转染miR-129 inhibitor组CNE2细胞增殖能力、侵袭能力显著升高(P0.05),凋亡显著下降(P0.05)。结论 miR-129抑制鼻咽癌细胞系CNE2的增殖和迁移能力,促进细胞凋亡。     

Gli2基因沉默对结肠癌细胞系SW480增殖、迁移和侵袭能力的影响

目的探讨胶质瘤相关癌基因同源蛋白2(Gli2)基因对结肠癌细胞系SW480增殖、迁移和侵袭能力的影响及相关机制。方法构建靶向Gli2基因的shRNA慢病毒载体,转染到SW480细胞中,用荧光显微镜观察绿色荧光蛋白的表达;实验设干扰组、阴性对照组和空白组。用MTT法、倍增时间与集落形成实验检测细胞的增殖能力;用Transwell小室法检测细胞的迁移、侵袭能力;利用qRT-PCR和Western blot法检测细胞间Gli2、cyclin D和MMP-2基因和蛋白的表达。结果SW480细胞转染慢病毒72 h后可见明显的绿色荧光蛋白表达,干扰组较阴性对照组与空白组Gli2表达降低,细胞增殖减慢,集落形成能力减弱,倍增时间延长,迁移、侵袭能力减弱,cyclin D1和MMP-2表达下降(P0.05)。结论沉默Gli2的表达能够抑制SW480细胞增殖、迁移、侵袭能力,机制可能与cyclin D1和MMP-2的下调有关。     

miR-27a对结肠癌SW480细胞增殖、迁移、侵袭及凋亡的影响及可能机制

目的 探讨miR-27a对结肠癌SW480细胞增殖、凋亡、侵袭及迁移的影响及可能机制。方法 qRT-PCR方法检测人结肠癌细胞株SW480与人正常结肠黏膜上皮细胞NCM460中miR-27a的表达水平。体外培养SW480细胞,将SW480细胞随机分为空白对照组(不进行任何处理)、miR-27a抑制剂组（转染miR-27a inhibitor）与阴性对照组（转染miR-27a inhibitor NC）,采用脂质体法进行转染,实时荧光定量PCR方法验证转染效率。采用四甲基偶氮唑蓝（MTT）法检测SW480细胞增殖;Transwell实验检测SW480细胞侵袭与迁移;流式细胞术检测SW480细胞凋亡;Western blot法检测转染后叉头框蛋白O1(FOXO1)、组织金属蛋白酶抑制剂2(TIMP-2)、泛素连接酶FBW7的表达。结果 miR-27a在SW480细胞中的表达水平显著高于NCM460细胞（P<0.01）。转染miR-27a抑制剂后,SW480细胞中miR-27a的表达水平明显降低,转染成功。抑制miR-27a表达后,SW480细胞的增殖、迁移与侵袭能力显著降低,凋亡率显...     

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...