miR-133-3p对甲状腺癌SW579细胞生物学行为和移植瘤生长的影响

目的 探究miR-133-3p对甲状腺癌SW579细胞和体内移植瘤生长的影响。方法 甲状腺癌SW579细胞分为对照组,miR-NC组,miR-133-3p mimic组,按分组转染miR-NC和miR-133-3p mimic。qRT-PCR检测甲状腺癌组织和癌旁组织及转染后细胞中miR-133-3p的表达,克隆形成;EDU染色检测细胞增殖;流式检测细胞凋亡和线粒体膜电位变化;Western blot检测Survivin,caspase-3蛋白表达;试剂盒检测细胞上清液中SOD和MDA含量。裸鼠皮下注射转染miR-133-3p mimic或miR-NC的SW579细胞,qRT-PCR检测瘤组织中miR-133-3p表达量,记录瘤组织体积,TUNEL检测瘤组织凋亡,免疫组化检测瘤组织中Survivin和caspase-3的表达。结果 甲状腺癌组织中miR-133-3p的表达降低。体外细胞实验结果显示,与对照组相比,miR-133-3p组miR-133-3p表达量增加,细胞克隆形成率、EDU阳性细胞率和Survivin蛋白表达降低,细胞凋亡率和caspase-3的蛋白表达升高,线粒体膜电位...     

miR-346 在鼻咽癌中的表达及生物学功能

目的:探讨miR-346 在鼻咽癌中的表达及在鼻咽癌中的生物学功能。方法:收集63 例鼻咽癌组织以及34 例 鼻咽部非癌组织标本,Real-time PCR 检测组织和6 株人鼻咽癌细胞系及1 株人正常鼻咽部永生化上皮细胞株NP69 中miR- 346 表达量,选取人鼻咽癌细胞系中表达量居中的两种细胞系,并转染miR-346 inhibitor,设置对照组(NC 组)并转染阴性对照 质粒,Real-time PCR 检测两种细胞系转染miR鄄346 inhibitor 和对照组miR鄄346 表达量,细胞增殖、凋亡分别采用Brdu-ELISA 和 流式细胞术检测,Transwell 小室实验检测细胞迁移和侵袭。结果:与鼻咽非癌组织比较,鼻咽癌组织中miR-346 表达量显著升 高(P =0.000);以正常人鼻咽部上皮细胞NP69 比较,各鼻咽癌细胞株中miR-346 相对表达量均显著升高,差异有统计学意义 (P<0.05)。选择6 种鼻咽癌细胞株中miR-346 表达量居中的两种,分别为CNE-1 和CNE-2,转染miR-346 inhibitor 后,两种鼻 咽癌细胞株miR-346 相对表达量均显著降低,与NC 组比较差异均有统计学意义(P<0.05)。两种鼻咽癌细胞转染miR-346 inhibitor 下调miR-346 表达后鼻咽癌细胞的增殖受到抑制,均在转染第3 天差异具有统计学意义(P<0.05)。下调miR-346 表 达后鼻咽癌细胞CNE-1 和CNE-2 的凋亡显著增加,迁移细胞数和侵袭细胞数显著降低,与NC 组比较差异均有统计学意义 (P<0.05)。结论:miR-346 在鼻咽癌中高表达,下调miR-346 表达会抑制鼻咽癌细胞增殖、迁移和侵袭,促进凋亡,miR-346 可 能作为一种癌基因在鼻咽癌的发生和发展中发挥重要的作用。     

miR-142-3p通过调控Hmgb1抑制雨蛙素诱导的大鼠胰腺外分泌细胞系AR42J凋亡

目的 探讨miR-142-3p调控Hmgb1对大鼠胰腺外分泌细胞系AR42J凋亡的影响。方法 将AR42J细胞分为空白组(blank)、急性胰腺炎模型组(AP,100 nmol/L雨蛙素作用24 h),再分别用miR-142-3p mimics、 mimics NC、miR-142-3p inhibitor和inhibitor NC转染模型组细胞,记为miR-142-3p mimics组、 mimics NC组、miR-142-3p inhibitor组和inhibitor NC组。用RT-qPCR检测细胞中miR-142-3p表达;Western blot检测HMGB1、caspase-3、Bax、Bcl-2蛋白表达;Hoechst染色测定细胞凋亡;流式细胞测量术检测细胞凋亡率;双荧光素酶报告基因实验明确miR-142-3p和Hmgb1的靶向关系。结果 与空白组相比,AP组中miR-142-3p表达水平显著下调(P<0.01),HMGB1、caspase-3蛋白表达量上调(P<0.05),Bax蛋白表达量显著上调(P<0.01),Bcl-2蛋白表达量显著降低(P&l...     

miR-506-3p通过靶向MTDH增加前列腺癌细胞的化学敏感性

目的研究miR-506-3p对前列腺癌细胞化学敏感性的影响及其作用机制。方法用RT-qPCR检测miR-506-3p和MTDH在前列腺癌细胞系和正常前列腺细胞系中的表达水平;以紫杉醇为诱导药物构建人前列腺癌耐药细胞株PC-3/PTX,将PC-3/PTX细胞随机分为5组对照组、NC mimic组、miR-506-3p mimic组、LV-MTDH组、mimic+MTDH组,利用Lipofectamine 3000转染试剂盒分别转染对应质粒。检测其存活率、IC50值、克隆细胞数目、凋亡率以及凋亡相关蛋白的表达水平;构建MTDH野生型(WT)和突变型(MUT),用双荧光素酶报告基因实验验证miR-506-3p与MTDH之间的靶向关系;Western blot检测miR-506-3p mimic处理后PC-3/PTX细胞中MTDH的蛋白表达水平。结果miR-506-3p在前列腺癌细胞中低表达,而MTDH高表达;miR-506-3p在PC-3/PTX细胞中的表达量显著低于在前列腺癌细胞PC-3中的表达量;相比于对照组和NC mimic组,miR-506-3p mimic组的PC-3/PTX细胞的存活率、IC50值、克隆细胞数目及Bcl-2表达明显降低,凋亡率及Bax表达明显升高;MTDH野生型较突变型能使荧光素酶活性显著下降;miR-506-3p mimic组PC-3/PTX细胞中MTDH蛋白表达水平显著低于对照组和NC mimic组;相比于对照组,miR-506-3p mimic组中PC-3/PTX细胞克隆数目显著减少,凋亡率升高,而LV-MTDH组与之相反;相比于LV-MTDH组,mimic+MTDH组PC-3/PTX细胞中MTDH的表达量显著下降,细胞克隆数目减少,凋亡率升高。结论miR-506-3p通过靶向抑制MTDH的表达能增强人前列腺癌耐药细胞株PC-3/PTX的化学敏感性。     

miR-143-3p靶向MAPK1对人结肠癌细胞增殖,凋亡和侵袭的调节作用

目的研究miR-143-3p靶向MAPK1与人结肠癌细胞增殖、凋亡和侵袭的关系。方法qRT-PCR检测miR-143-3p mimic转染效果和MAPK1的m RNA表达水平;双荧光素酶报告实验分析miR-143-3p与MAPK1的靶向关系;蛋白质印迹检测MAPK1的蛋白表达水平,CCK-8检测细胞增殖倍数,Hoechst染色检测细胞增殖,体外侵袭实验检测细胞侵袭,蛋白质印迹检测Ki67、VEGF、MMP-2和cleaved caspase-3的表达。结果 miR-143-3p mimic抑制人结肠癌细胞SW620中MAPK1 mRNA和蛋白的表达水平;miR-143-3p mimic与MAPK1野生型报告载体共转后,荧光素酶的活性显著降低;miR-143-3p mimic转染SW620细胞后,细胞增殖、侵袭能力显著降低,凋亡细胞数目显著增加,Ki67、VEGF和MMP-2的表达水平显著降低,cl-caspase-3的表达水平显著上升;miR-143-3p mimic能缓解MAPK1高表达对SW620细胞增殖、侵袭的诱导作用和对细胞凋亡的抑制作用。结论 miR-143-3p抑制人结肠癌细胞增殖和侵袭,诱导细胞凋亡,其作用机制与靶向抑制MAPK1有关。     

miR-143-3p 靶向MAPK1对人结肠癌细胞增殖，凋亡和侵袭的调节作用#br#

目的　研究miR-143-3p靶向MAPK1与人结肠癌细胞增殖、凋亡和侵袭的关系。 方法　qRT-PCR检测miR-143-3p mimic转染效果和MAPK1的mRNA表达水平;双荧光素酶报告实验分析miR-143-3p与MAPK1的靶向关系;蛋白质印迹检测MAPK1的蛋白表达水平,CCK-8检测细胞增殖倍数,Hoechst染色检测细胞增殖,体外侵袭实验检测细胞侵袭,蛋白质印迹检测Ki67、VEGF、MMP-2和cleaved caspase-3的表达。 结果　miR-143-3p mimic抑制人结肠癌细胞SW620中MAPK1 mRNA和蛋白的表达水平;miR-143-3p mimic与MAPK1野生型报告载体共转后,荧光素酶的活性显著降低;miR-143-3p mimic转染SW620细胞后,细胞增殖、侵袭能力显著降低,凋亡细胞数目显著增加,Ki67、VEGF和MMP-2的表达水平显著降低,cl-caspase-3的表达水平显著上升;miR-143-3p mimic能缓解MAPK1高表达对SW620细胞增殖、侵袭的诱导作用和对细胞凋亡的抑制作用。 结论　miR-143-3p抑制人结肠癌细胞增殖和侵袭,诱导细胞凋亡,其作用机制与靶向抑制MAPK1有关。     

miR-26b-5p通过抑制REST表达调节胶质瘤细胞生长和侵袭

目的探究miR-26b-5p通过抑制抑制元素1-沉默转录因子(repressor element 1-silencing transcrip-tion factor,REST)表达调节胶质瘤细胞生长和侵袭情况.方法逆转录-聚合酶链反应检测miR-26b-5p和REST表达水平;荧光素酶报告实验检测miR-26b-5p和REST的靶向关系;Hoechst染色检测细胞凋亡;Colony形成法检测细胞增殖;Transwell检测细胞侵袭;蛋白免疫印迹检测细胞Ki67、MMP-9、cleaved caspase-3蛋白表达水平.结果miR-26b-5p和REST存在直接靶向作用关系,与Control组比较,mimic组细胞增殖数、侵袭数和Ki67、MMP-9表达明显降低,凋亡率与cleaved caspase-3表达明显升高,inhibitor组细胞增殖数、侵袭数和Ki67、MMP-9表达明显升高,凋亡率与cleaved caspase-3表达明显降低.结论miR-26b-5p可以通过抑制对REST的表达调节胶质瘤细胞生长、侵袭、凋亡能力.     

miR-490-5p 靶向SP1 抑制骨肉瘤的发生发展

目的:研究miR-490-5p对骨肉瘤细胞生长和运动的作用。方法:体外实验设置control组、mimic-NC组、miR-490-5p mimic组、SP1组、mimic+SP1组,通过Lipofectamine 2000将质粒分别或联合转染进入各组骨肉瘤MG63细胞,运用基因预测软件预测靶基因,荧光素实验验证靶向关系,RT-qPCR检测miR-490-5p和SP1的表达,MTT法检测细胞增殖,Western blot检测Ki67、PCNA、Bcl-2、Bax、caspase-3、caspase-9、E-cadherin和N-cadherin的表达,Transwell检测细胞侵袭,划痕实验检测细胞迁移;体内实验设置Control组和miR-490-5p mimic组,分别在裸鼠右后肢腹侧皮下注射0.2 ml骨肉瘤MG63细胞和转染miR-490-5p mimic的骨肉瘤MG63细胞悬液,第30天颈椎脱位法处死裸鼠,电子天平称肿瘤重量,Western blot检测Ki67、Bax、caspase-3、E-cadherin蛋白表达情况。结果:miR-490-5p在骨肉瘤细胞MG63中低表达,miR-490-5p与SP1在3′UTR区存在结合位点,miR-490-5p直接靶向作用于SP1,且miR-490-5p过表达抑制SP1表达;在体外,miR-490-5p过表达明显降低骨肉瘤MG63细胞生长速度,下调Ki67、PCNA和Bcl-2表达,上调Bax、caspase-3和caspase-9表达,减少侵袭细胞数目,增宽划痕,降低愈合率,上调E-cadherin表达,下调N-cadherin表达;在体内,miR-490-5p过表达减轻肿瘤重量,降低Ki67、Bax和caspase-3的表达,升高E-cadherin表达。结论:miR-490-5p靶向SP1抑制骨肉瘤细胞MG63生长和运动。     

miR-451a表达抑制宫颈癌细胞侵袭和顺铂耐药的影响及作用机制

目的 探讨miR-451a对宫颈癌细胞侵袭和顺铂(DDP)耐药的影响及作用机制研究。方法 qRT-PCR检测miR-451a在宫颈癌组织中的表达水平,分析miR-451a的表达水平与患者临床病理参数的关系。宫颈癌细胞HeLa分为对照组(NC HeLa组)和miR-451a模拟物组(miR-451a mimic HeLa组),分别进行各组mimic转染,Boyden实验检测各组细胞侵袭能力。采用药物递增诱导法建立DDP耐药细胞株HeLa(DDP-HeLa),qRT-PCR检测HeLa和DDP-HeLa细胞中miR-451a的表达。DDP-HeLa细胞分为NC DDP-HeLa组和miR-451a mimic DDP-HeLa组,分别进行各组mimic转染,MTS实验检测NC HeLa组、miR-451a mimic HeLa组、NC DDP-HeLa组和miR-451a mimic DDP-HeLa组对DDP敏感性的影响。Western blotting检测各组细胞中EMT相关蛋白E-cadherin、N-cadherin和Vimentin的表达。结果 miR-451a宫颈癌组织中的表达...     

miR-129-5p调控Wnt5a抑制胆囊癌细胞增殖和转移能力的机制研究

目的 研究微小RNA-129-5p(miR-129-5p)靶向调控Wnt5a抑制胆囊癌细胞增殖和转移能力的作用及机制。方法 采用RT-PCR检测胆囊癌细胞NOZ、SGC-996、GBC-SD和正常胆管上皮细胞系HIBEpic中miR-129-5p的表达水平。选择miR-129-5p表达较低的胆囊癌细胞进行miR-129-5p mimic转染,分为对照组(NC组)和miR-129-5p过表达组(miR-129-5p mimic组),采用MTT实验检测各组细胞的增殖能力,Transwell实验检测各组细胞的转移能力。Targetscan7.1预测软件及双荧光素酶报道基因试验检测miR-129-5p对Wnt5a基因的靶向调控作用。RT-PCR检测胆囊癌细胞NOZ、SGC-996、GBC-SD及NC组、miR-129-5p mimic组中Wnt5a mRNA的表达水平。胆囊癌细胞分为NC组、miR-129-5p mimic组、miR-129-5p过表达与Wnt5a敲减质粒共转染组(miR-129-5p mimic+sh-Wnt5a组)和miR-129-5p过表达与Wnt5a过表达质粒共转染组(...     

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.     

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.     

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...