MicroRNA-29b重组慢病毒表达载体的构建及其抑制胃癌细胞系的迁移和增殖

目的构建has-miR-29b重组慢病毒的表达载体,并观察其对胃癌细胞系迁移和增殖能力的影响。方法将PCR扩增的miR-29b前体序列和pMIR载体经双酶切后连接产生pMIR-miR-29b慢病毒表达载体。pMIR-miR-29b、Packaging Plasmid(s)和pVSV-G质粒共转染包装细胞系293TN,包装产生慢病毒。使用收获的慢病毒颗粒感染胃癌细胞系HGC-27,72 h后利用real-time PCR检测miR-29b在HGC-27内的表达水平,Western blot检测其靶基因MCL-1的表达。划痕实验和细胞增殖实验分别观察在HGC-27细胞中过表达miR-29b后细胞迁移能力及增殖能力的变化。结果成功构建了miR-29b重组慢病毒的表达载体,感染胃癌细胞HGC-27后,能够成功过表达miR-29b。在HGC-27细胞中过表达miR-29b,其靶基因MCL-1的表达明显被抑制,并且Lenti-29b组与对照组Untreat组和Lenti-vector组相比,Lenti-29b组的迁移能力显著降低(P<0.01);Lenti-29b组与Lenti-vector组相比,Lenti-29b组在...     

miR-101通过抑制DNA甲基转移酶3a抑制乳腺癌细胞的增殖和迁移

目的研究miR-101对乳腺癌细胞增殖和迁移能力的影响,并分析miR-101影响乳腺癌细胞生物学行为的可能机制。方法采用实时荧光定量PCR检测miR-101和DNA甲基转移酶3a(DNMT3a)在乳腺癌组织和相对应的正常乳腺组织,正常乳腺细胞以及多种乳腺癌细胞系中的表达水平,应用慢病毒介导感染的方法分别将miR-101序列及shRNA-DNMT3a转至MDAMB-231人乳腺癌细胞,通过Western blot法检测DNMT3a以及上皮钙黏素(E-cadherin)的表达,分析miR-101影响乳腺癌细胞生物学行为的可能机制。通过MTT法检测乳腺癌细胞的增殖能力,划痕实验检测乳腺癌细胞的迁移能力。结果miR-101在MCF-7、MDA-MB-231、MDA-MB-361、HCC70乳腺癌细胞系及乳腺癌组织中表达低于正常乳腺组织及MCF-10A乳腺细胞系,而DNMT3a表达则升高。Western blot实验结果显示过表达miR-101的MDA-MB-231细胞中,DNMT3a的表达明显下降,而E-cadherin的表达升高;应用shRNA-DNMT3a抑制DNMT3a表达后,E-cadherin的表达也明显升高,证实miR-101可能通过抑制DNMT3a而发挥作用。体外实验显示过表达miR-101可明显抑制乳腺癌细胞MDA-MB-231的增殖和迁移能力。结论miR-101抑制乳腺癌细胞增殖和迁移能力可能是通过抑制DNMT3a进而恢复E-cadherin表达来实现。     

MicroRNA-205对人皮肤上皮细胞迁移能力的调控

目的 观察microRNA-205 (miR-205)在人皮肤上皮细胞中的表达抑制和过量表达对于该类细胞迁移能力的影响。 方法 使用体外合成的miR-205抑制剂（antagomir-205）处理人皮肤上皮细胞并检测抑制效果,观察其对皮肤上皮细胞迁移的影响。在293TN细胞中包装并收获能过表达成熟miR-205的重组慢病毒颗粒,感染人皮肤上皮细胞并检测过表达效果,进一步观察其对皮肤细胞迁移的影响。 结果 成功使用miR-205抑制剂实现对人皮肤上皮细胞内源性miR-205的抑制,证实其抑制了皮肤上皮细胞的迁移。成功获得过表达miR-205的重组慢病毒颗粒,证明miR-205可促进皮肤上皮细胞的迁移。 结论 miR-205可以促进皮肤细胞的迁移。     

miR-760对胃癌细胞系MGC-803增殖、迁移和侵袭的影响

目的探讨miR-760对胃癌细胞系MGC-803增殖、迁移和侵袭的影响。方法 Real-time PCR分析50例胃癌组织(C)及其癌旁(N)中miR-760的表达水平;用pc DNA3.1载体构建过表达miR-760的重组质粒(pc DNA-miR-760),实现miR-760在MGC-803细胞中的过表达;分别用CCK-8法、Transwell和划痕实验检测细胞增殖、侵袭和迁移能力。结果与癌旁对照组相比,36例(72%)胃癌组织中出现miR-760的表达下调;过表达miR-760能显著抑制MGC-803细胞的迁移和侵袭能力(P0.05),但对其增殖影响不大。结论 miR-760的表达下调可能与胃癌的进展有关,过表达miR-760可以抑制胃癌MGC-803细胞的迁移和侵袭。     

白藜芦醇靶向mTORC2/Rictor抑制HUVECs的增殖迁移及管腔形成

目的探讨白藜芦醇对腺病毒介导的Rictor基因转染人脐静脉内皮细胞(HUVECs)的增殖、迁移及管腔形成的影响。方法将PCR扩增得到的目的基因Rictor定向克隆入GV314载体获得重组质粒,经Ad Max包装系统与辅助包装质粒在HEK 293T细胞中重组构建Rictor过表达腺病毒载体(Ad-Rictor),不含目的基因的Ad-Null为阴性对照组。分离培养HUVECs后分别用Ad-Rictor及Ad-Null重组腺病毒感染细胞,另设空白对照组及白藜芦醇干预组Ad-Rictor+Res。感染后荧光显微镜及Western blot检测重组蛋白表达;CCK8、划痕实验和血管形成实验观察HUVECs增殖、迁移及血管形成能力。结果重组腺病毒Ad-Rictor及Ad-Null构建成功。与对照组相比,Ad-Rictor感染HUVECs显著上调基因Rictor的表达,提高了HUVECs的增殖活力,迁移和体外管腔形成能力(P0.05);白藜芦醇干预显著抑制了Rictor过表达情况下HUVECs的增殖、迁移和体外管腔形成(P0.05)。结论白藜芦醇可以靶向mTORC2/Rictor抑制人脐静脉内皮细胞增殖、迁移及管腔形成。     

miR-30a抑制人骨肉瘤细胞143B的迁移、侵袭和活力

目的探讨miR-30a对人骨肉瘤细胞143B侵袭、迁移和细胞活力的影响。方法过表达或抑制miR-30a分别处理人骨肉瘤细胞143B。划痕实验观察细胞划痕愈合能力;Transwell实验检测143B细胞迁移和侵袭能力;MTT实验检测细胞活力;定量PCR实验确认过表达miR-30a腺病毒有效性并且检测RUNX2 mRNA表达;Western blot检测细胞中RUNX2总蛋白表达。结果过表达miR-30a抑制了骨肉瘤细胞143B迁移和侵袭(P0.05),在72 h时,miR-30a明显抑制细胞活力(P0.01);抑制miR-30a的内源性表达后,143B细胞的迁移和侵袭能力增加(P0.05),细胞活力也表现出上升水平(P0.01);同时过表达miR-30a可以抑制RUNX2的蛋白表达,抑制内源性miR-30a后RUNX2蛋白水平表达增加(P0.05)。荧光素酶活性检测,miR-30a可以靶向于RUNX2(P0.01)。结论 miR-30a抑制骨肉瘤细胞143B的迁移、侵袭和活力,其作用可以能是通过抑制RUNX2的表达来实现。     

慢病毒介导的SEMA3G过表达对人胰腺癌细胞系PANC-1的作用

目的通过体外实验探讨过表达SEMA3G对人胰腺癌细胞PANC-1细胞增殖、侵袭和迁移能力的影响。方法将携带SEMA3G的慢病毒载体转染人胰腺癌PANC-1细胞系,利用real-time PCR和Western blot分别检测mRNA和蛋白质水平。CCK-8法检测细胞增殖,transwell实验检测细胞侵袭和细胞划痕试验检测细胞的迁移。结果成功建立稳定转染SEMA3G胰腺癌PANC-1细胞系。SEMA3G病毒感染组与空白对照组和阴性对照组相比细胞的增殖能力显著降低(P0.05),SEMA3G病毒感染组的细胞侵袭和迁移能力明显低于两组对照组(P0.05)。结论 SEMA3G慢病毒载体能有效过表达人胰腺癌PANC-1细胞中内源性SEMA3G蛋白,进而抑制细胞增殖、侵袭和迁移。     

组蛋白去甲基化酶含Jumonji结构域蛋白3(JMJD3)抑制人脐静脉内皮细胞增殖及侵袭和迁移

目的分析组蛋白特异性去甲基化酶含Jumonji结构域蛋白3(JMJD3)对人脐静脉内皮细胞(HUVEC)的细胞周期、凋亡和迁移的影响。方法合成JMJD3的小干扰RNA(siRNA)、构建JMJD3过表达载体;阴性对照siRNA、si JMJD3或质粒p MSCV-PIG、p MSCV-JMJD3转染HUVEC 48 h后,通过荧光实时定量PCR检测JMJD3 mRNA的水平;流式细胞术检测各转染组HUVEC的细胞周期与凋亡的变化;TranswellTM实验和划痕实验检测转染后的HUVEC侵袭和迁移能力的变化。结果 HUVEC转染si JMJD3 48 h后JMJD3的表达水平下降,S期细胞增加、而G1期细胞明显减少。下调JMJD3后HUVEC的增殖能力增强,细胞凋亡减少,细胞侵袭、迁移能力增强。而在HUVEC转染JMJD3过表达质粒MSCV-JMJD3 48 h后,细胞内JMJD3水平增加,S期细胞显著减少,而G1期细胞则明显增加,同时HUVEC的增殖能力受到抑制,细胞凋亡增多,细胞侵袭和迁移能力减弱。结论 JMJD3具有抑制HUVEC增殖、侵袭和迁移,促进细胞凋亡的作用。     

microRNA98靶向N-RAS对鼻咽癌CNE-1细胞增殖与迁移的影响

目的探讨miR-98对鼻咽癌CNE-1细胞增殖与迁移的影响及可能机制。方法利用脂质体介导的miR-98模拟物或阴性对照转染鼻咽癌CNE-1细胞,并通过实时定量PCR进行验证。MTT实验检测CNE-1细胞增殖能力的变化,划痕实验检测CNE-1迁移能力变化,采用生物信息学软件预测N-RAS是否为miR-98潜在的靶基因,并以双荧光素酶报告基因实验验证。Western blot检测miR-98过表达后CNE-1细胞N-RAS蛋白的表达变化以及下游ERK、p-ERK、AKT、p-AKT的表达变化。结果 MiR-98过表达能抑制鼻咽癌CNE-1细胞的体外增殖与迁移能力;生物信息学软件分析结果显示N-RAS是miR-98的靶基因之一,双荧光素酶报告基因证实N-RAS为miR-98的下游靶基因。miR-98过表达后,CNE-1细胞中N-RAS表达下调,ERK与Akt蛋白的表达水平不变,但pERK与p-Akt蛋白的表达水平下调。结论 miR-98通过靶向调控N-RAS抑制鼻咽癌CNE-1细胞增殖与迁移。     

miR-195靶向调控PDK4表达抑制肝癌细胞增殖和促进凋亡

目的 探讨miR-195调控PDK4表达在肝癌增殖和凋亡中的作用.方法 体外培养肝癌细胞,分别转染miR-195模拟物或阴性对照质粒Nc,转染48h后,MTT检测细胞增殖,流式细胞术检测细胞凋亡,划痕实验检测迁移能力,Western blot和PCR检测PDK4表达.采用双荧光素酶实验检测miR-195与PDK4的靶向调控关系.结果 转染miR-195可明显抑制肝癌细胞内PDK4的表达,抑制肝癌细胞增殖和迁移,促进细胞凋亡.HEPG2细胞转染miR-195 mimics后,细胞增殖率和细胞迁移能力较对照组和miR-NC组显著下降(P＜0.05);细胞凋亡率较对照组和miR-NC组显著升高,PDK4 mRNA及蛋白表达水平较对照组和miR-NC组显著下降(P＜0.05).Target Scan结果提示PDK4可能是miR-195的下游靶基因,miR-195能够抑制野生型PDK4 3'UTR报告基因载体的荧光素酶活性,但是对突变型PDK4 3'UTR无明显影响.结论 上调miR-195能靶向抑制PDK4,进而对肝癌细胞起抑制增殖、迁移和促进凋亡的作用.     

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...