Expression of the Capsid Precursor Protein gene of Foot-and-mouth Disease Virus and Green Fluorescent Protein Gene in BHK-21 Cells Mediated by Retroviral Vector

We have constructed a retroviral vector mediated mammalian cell expression system of the capsid precursor protein of foot-and-mouth disease virus(FMDV).The recombinant retroviral vector pBABEpuro-P1-2A-EGFP was constructed by sequentially inserting capsid precursor protein gene(P1) of FMDV and enhanced green fluorescent protein gene(EGFP) into pBABEpuro.The recombinant retroviral vector and the pVSV-G plasmid were co-transfected into packaging cells(GP2-293) by liposomemediated transduction to produce the pseudovirus.The pseudovirus was used to infect BHK-21 cells and resistant cells were screened with puromycin.Green fluorescent proteins were observed by fluorescence microscopy and expression of the capsid precursor protein gene of FMDV was detected by indirect immunofluorescence.The recombinant retroviral vector pBABEpuro-P1-2A-EGFP was constructed successfully.The capsid precursor protein of FMDV and green fluorescent protein were expressed in BHK-21 cells.The mammalian cell expression system for the capsid precursor protein of FMDV has been constructed successfully,which lays the foundation of development of a FMDV subunit vaccine.

Antitumor Effect of Apcin on Endometrial Carcinoma via p21-Mediated Cell Cycle Arrest and Apoptosis

Objective Endometrial carcinoma(EC)is a prevalent gynecological malignancy characterized by increasing incidence and mortality rates.This underscores the critical need for novel therapeutic targets.One such potential target is cell division cycle 20(CDC20),which has been implicated in oncogenesis.This study investigated the effect of the CDC20 inhibitor Apcin on EC and elucidated the underlying mechanism involved.Methods The effects of Apcin on EC cell proliferation,apoptosis,and the cell cycle were evaluated using CCK8 assays and flow cytometry.RNA sequencing(RNA-seq)was subsequently conducted to explore the underlying molecular mechanism,and Western blotting and coimmunoprecipitation were subsequently performed to validate the results.Animal studies were performed to evaluate the antitumor effects in vivo.Bioinformatics analysis was also conducted to identify CDC20 as a potential therapeutic target in EC.Results Treatment with Apcin inhibited proliferation and induced apoptosis in EC cells,resulting in cell cycle arrest.Pathways associated with apoptosis and the cell cycle were activated following treatment with Apcin.Notably,Apcin treatment led to the upregulation of the cell cycle regulator p21,which was verified to interact with CDC20 and consequently decrease the expression of downstream cyclins in EC cells.In vivo experiments confirmed that Apcin treatment significantly impeded tumor growth.Higher CDC20 expression was observed in EC tissue than in nonmalignant tissue,and increased CDC20 expression in EC patients was associated with shorter overall survival and progress free interval.Conclusion CDC20 is a novel molecular target in EC,and Apcin could be developed as a candidate antitumor drug for EC treatment.

miR-21调控TLK2表达对急性髓系白血病细胞增殖和凋亡的影响

目的:探讨mi R-21调控TLK2表达对急性髓系白血病(AML)细胞增殖和凋亡的影响。方法:选取2019年1月至2022年7月在新乡市中心医院收治的70例AML患者,同时选取30例缺铁性贫血患者作为对照组,使用Ficoll密度梯度离心法获取两组患者的骨髓单个核细胞。RT-q PCR测定各组骨髓单个核细胞中mi R-21、TLK2 m RNA的表达水平。使用脂质体转染技术将mimics-mi R-21、mimics-NC、inhibitor-mi R-21、inhibitor-NC及NC转染至HL-60细胞。采用CCK-8法测定各组HL-60转染细胞经阿糖胞苷处理后的活性。TUNEL法测定HL-60转染细胞凋亡率。RT-q PCR测定转染inhibitor-mi R-21后HL-60细胞TLK2 m RNA的表达。结果:AML患者骨髓单个核细胞中mi R-21、TLK2 m RNA的相对表达水平均明显高于对照组患者(均P<0.05)。HL-60细胞经阿糖胞苷处理后,inhibitor-mi R-21组和mimics-mi R-21组的细胞活性均随阿糖胞苷浓度升高显著下降(P<0.05),但在每个阿糖胞苷浓度点,inhibitor-mi R-21组的细胞活性均低于对照组(P<0.05),而mimics-mi R-21组的细胞活性均高于对照组(P<0.05)。inhibitor-mi R-21组的细胞凋亡率显著升高(P<0.05),而mimics-mi R-21组的细胞凋亡率显著降低(P<0.05)。HL-60细胞经inhibitor-mi R-21处理后,TLK2 m RNA的相对表达量明显下降(P<0.05)。结论:mi R-21在AML患者中呈高表达,可能通过抑制TLK2的表达来促使AML细胞凋亡。

miR-21低表达对垂体瘤细胞系RC-4BC增殖、凋亡的影响及与PTEN靶向关系

目的观察微小RNA-21(miR-21)低表达对垂体瘤细胞系RC-4BC增殖、凋亡的影响,并分析其与第10号染色体丢失的张力蛋白同源磷酸酶基因(PTEN)的靶向关系。方法取对数生长期的RC-4BC细胞分为两组,沉默组转染miR-21抑制物miR-21 inhibitor,阴性对照组转染抑制物阴性对照NC-inhibitor,采用RT-PCR法检测miR-21、第10号染色体丢失的张力蛋白同源磷酸酶基因(PTEN)mRNA,采用CCK8实验观察两组细胞增殖能力(以OD值表示),采用平板克隆实验观察两组细胞集落形成能力(以集落形成数表示),采用流式细胞术观察两组细胞凋亡率并观察细胞周期分布情况。收集RC-4BC细胞制备单细胞悬液,分别将miR-21 mimics或NC-mimics与PTEN-WT或PTEN-MUT共转染至RC-4BC细胞,转染后细胞标记为miR-21 mimics+PTEN-WT组、NC-mimics+PTEN-WT组、miR-21 mimics+PTEN-MUT组、NC-mimics+PTEN-MUT组,采用双荧光素酶报告基因实验验证miR-21与PTEN的靶向关系。结果沉默组RC-4BC细胞中miR-21、PTEN mRNA相对表达量分别为0.30±0.08、2.89±0.14,阴性对照组RC-4BC细胞中miR-21、PTEN mRNA相对表达量分别为1.01±0.02、0.99±0.03,两组相比,P均<0.05。沉默组RC-4BC细胞24 h、48 h、72 h时OD值均低于阴性对照组(P均<0.05)。沉默组RC-4BC细胞集落形成数低于阴性对照组(P<0.05)。沉默组RC-4BC细胞凋亡率高于阴性对照组(P<0.05)。沉默组RC-4BC细胞G0/G1期占比65.65%±7.82%、S期占比19.25%±3.70%,阴性对照组RC-4BC细胞G0/G1期占比45.62%±5.03%、S期占比35.72%±4.67%,两组相比,P均<0.05。miR-21 mimics+PTEN-WT组、NC-mimics+PTEN-WT组、miR-21 mimics+PTEN-MUT组、NC-mimics+PTEN-MUT组细胞的相对荧光素酶活性分别为0.39±0.07、1.02±0.03、1.01±0.04、1.00±0.03,其中miR-21 mimics+PTEN-WT组相对荧光素酶活性与其他各组相比,P均<0.05。结论沉默miR-21能够移至垂体瘤细胞系RC-4BC的增殖、促进其凋亡,其机制可能与靶向调控PTEN基因有关。

miR-21在食管鳞状细胞癌中的作用机制研究进展

食管癌是一种发病率和死亡率均较高的消化道疾病,且早期难以发现。微RNA(miRNA/miR)-21广泛存在于人体各种细胞和组织中,并与人体的生长和发育、细胞周期及组织分化过程紧密相关,其作为miRNA家族的重要成员,也是一种内源性调控序列,在食管癌组织中的表达量异常升高,但目前miR-21的相关研究成果有限,还不足以将其单独作为靶点用于食管癌治疗。基于此,miR-21的早期准确检测、其各类调控基因的调控机制及其是否可作为新靶点治疗食管癌成为研究热点。

Correlation between microRNA-21 and expression of Th17 and Treg cells in microenvironment of rats with hepatocellular carcinoma

Objective: To study the correlation between mi R-21 and Treg/Th17 ratio in the microenvironment of rats with hepatocellular carcinoma. Methods: Diethylnitrosamine was used to build the hepatocel ular carcinoma model of rats; the content of Treg cells and Th17 cells and the expression of mi R-21 in the peripheral blood of rats with hepatocellular carcinoma were detected. The statistical analysis was performed on the correlation between mi R-21 expression and Treg/Th17 ratio. Results: Hepatocellular carcinoma model of rats was successfully constructed. The proportion of Th17 cells among all CD4+T cells in the peripheral blood of rats with hepatocellular carcinoma was 5.319%, which was higher than the control group; while the proportion of Treg cells was 9.472%, which was higher than the control group. Treg/Th17 ratio in the model group was 1.781, compared with 1.478 in the control group. The expression of mi R-21 was increased in the peripheral blood of rats with hepatocellular carcinoma and it showed a positive correlation with the ratio of Treg/Th17. Conclusions: There is a positive correlation between the expression level of miR-21 and the ratio of Treg/Th17.

BHK-21细胞规模化培养鸡新城疫病毒工艺的研究和初步应用

为了实现鸡新城疫病毒HN2018株(基因Ⅶ型)在乳仓鼠肾(BHK-21)细胞上的无血清规模化培养,本试验采用悬浮培养技术驯化和筛选了1株能够稳定传代的BHK-21-xh悬浮细胞株;使用该细胞以初始密度为100×10^(4)个/mL接种摇瓶进行培养,并对摇瓶培养鸡新城疫病毒HN2018株的接毒细胞密度、培养温度、接毒量、收毒时间等工艺参数进行摸索和优化;利用摇瓶优化的病毒培养工艺,在10和100 L生物反应器中逐级放大培养BHK-21-xh悬浮细胞,接种鸡新城疫病毒;采用生物反应器悬浮培养的鸡新城疫病毒HN2018株细胞毒与鸡胚毒分别制备成灭活疫苗,免疫SPF鸡进行免疫效力的比较。结果显示,在摇瓶中培养72 h细胞密度均不低于800×10^(4)个/mL,细胞活率均不低于96%;按照BHK-21-xh细胞密度不低于800×10^(4)个/mL,病毒感染复数(MOI)为0.216进行接毒,同时添加终浓度为20μg/mL的胰蛋白酶,于35℃温度条件下培养64~72 h收获病毒液,鸡新城疫悬浮培养细胞毒红细胞凝集(HA)效价最高能够达到10log 2。在生物反应器中接种鸡新城疫病毒,其HA效价均能达到10log 2。细胞苗与鸡胚苗免疫效力相当,攻毒后均能获得100%保护,且免疫血清红细胞凝集抑制(HI)抗体效价均远高于新城疫国家标准。结果表明,应用细胞无血清全悬浮培养技术规模化培养鸡新城疫病毒HN2018株,生产工艺稳定,获得的抗原效价和纯度高,制备的灭活疫苗免疫效力良好,能够应用于新城疫疫苗的规模化生产。

miR-21对人口腔癌细胞株HSQ-89增殖、侵袭与迁移的影响实验研究

目的:探讨微小核糖核酸-21(miR-21)介导Smad7调节转化生长因子β(TGF-β)/Smad信号通路对人口腔癌细胞株HSQ-89增殖、侵袭与迁移的作用。方法:取人口腔癌细胞株HSQ-89培养传代,分为阴性对照组、下调组、上调组和正常组,前三者分别采用脂质体转染法将携带阴性对照(NC inhibitor)、miR-21抑制剂(miR-21 inhibitor)、miR-21模拟物(miR-21 mimics)载体进行转染,正常组仅添加等量无菌蒸馏水。观察各组细胞增殖、侵袭、迁移能力;实时-定量聚合酶链反应(RT-qPCR)检测各组细胞miR-21、TGF-β_(1)、Smad3、Smad7、细胞周期蛋白D1(CCND1)、MYC、E-钙黏蛋白(E-cadherin)、波形蛋白(Vimentin)、基质金属蛋白酶-2(MMP-2)mRNA表达;蛋白免疫印迹法(WB)检测各组细胞TGF-β_(1)、Smad3、Smad7、CCND1、MYC、E-cadherin、Vimentin、MMP-2蛋白表达及p-Smad3水平;双荧光素酶报告基因检测验证miR-21是否靶向Smad7。结果:与正常组和阴性对照组比较,上调组细胞增殖、侵袭、迁移能力上升,下调组细胞增殖活性下降、侵袭细胞数减少、划痕愈合率下降(均P<0.05);与正常组和阴性对照组比较,上调组细胞miR-21表达、TGF-β_(1)、Smad3、CCND1、MYC、Vimentin、MMP-2 mRNA和蛋白表达上升、Smad7和E-cadherin mRNA和表达下降,差异有统计学意义(均P<0.05),下调组细胞miR-21表达、TGF-β_(1)、Smad3、CCND1、MYC、Vimentin、MMP-2 mRNA和蛋白表达下降、Smad7和E-cadherin mRNA和蛋白表达上升(均P<0.05);经双荧光素酶报告基因实验验证miR-21靶向Smad7。结论:miR-21促进口腔癌细胞增殖、侵袭和迁移,可能与调节Smad7、TGF-β/Smad信号通路相关。

雪旺细胞来源的外泌体miR-21通过靶向SPRY2促进大鼠坐骨神经损伤后修复的研究

目的:研究高表达miR-21的雪旺细胞(Schwann cells,SC)来源外泌体对坐骨神经损伤(sciatic nerve injury,SNI)的修复作用及机制。方法:分别采用空载慢病毒和高表达miR-21的慢病毒感染SC株,收集SC上清外泌体并进行鉴定。采用神经断端吻合术建立SNI大鼠模型,术后随机分为模型组、SC来源外泌体组和高表达miR-21的SC来源外泌体组(n=10)。其中,SC来源外泌体组和高表达miR-21的SC来源外泌体组分别采用体外收集的外泌体局部注射进行治疗,3周后行为学实验检测神经功能恢复,免疫荧光染色评价SNI后轴突髓鞘再生,RT-q PCR检测血清外泌体miR-21及神经组织中miR-21和SPRY2的表达水平,双荧光素酶报告基因实验体外验证miR-21和SPRY2之间的靶向互作。结果:与模型组相比,其余各组大鼠坐骨神经功能和神经再生情况均出现明显改善,RT-q PCR结果显示血清外泌体及神经组织中miR-21的表达水平显著升高,神经组织中SPRY2的表达水平显著降低,其中高表达miR-21的SC细胞来源外泌体组较SC来源外泌体组变化更显著;双荧光素酶报告基因实验表明miR-21靶向调节SPRY2的表达。结论:高表达miR-21的SC来源外泌体通过靶向SPRY2显著促进SNI后修复。

miR-21-3p通过下调CCT4抑制食管鳞癌细胞的迁移及侵袭

目的:探讨miR-21-3p对食管鳞癌细胞迁移和侵袭的影响及其作用机制。方法:通过数据库检索miR-21-3p的下游靶基因,GEPIA2数据库预测CCT4在食管鳞癌中的表达和对食管鳞癌患者预后的影响,培养食管鳞癌细胞TE-1、KYSE150,将miR-21-3p inhibitor、SiCCT4、Plenti-CMV-CCT4-GFP/Puro转染至TE-1和KYSE150细胞中,分为miR-21-3p inhibitor组和inhibitor NC组、SiCCT4组和SiNC组、Plenti-CMV-CCT4组和inhibitor+Plenti-CMV-CCT4组,采用qRT-PCR检测各组细胞中miR-21-3p和CCT4 mRNA的表达水平,Transwell迁移侵袭实验检测各组细胞的迁移及侵袭能力,Western blot检测转染后各组细胞CCT4蛋白的表达水平。结果:数据库预测结果显示CCT4在食管鳞癌中过表达,与食管鳞癌患者总体生存期相关,与miR-21-3p呈正相关。qRT-PCR显示miR-21-3p和CCT4在食管癌细胞相较于正常上皮细胞表达显著升高,且在抑制miR-21-3p后CCT4表达水平显著降低(P<0.05)。Transwell实验显示,inhibitor组迁移率及侵袭率显著低于inhibitor NC组(P<0.05);SiCCT4组迁移率及侵袭率显著低于SiNC组(P<0.05);inhibitor+Plenti-CMV-CCT4组迁移率及侵袭率显著高于inhibitor组(P<0.05);Western blot检测CCT4蛋白发现,inhibitor组蛋白低于inhibitor NC组(P<0.05),inhibitor+Plenti-CMV-CCT4组蛋白显著高于inhibitor组(P<0.05)。结论:miR-21-3p和CCT4在食管癌中呈现过表达,miR-21-3p通过下调CCT4表达抑制食管癌细胞迁移和侵袭能力。

Upregulation of MiR-126 Delays the Senescence of Human Glomerular Mesangial Cells Induced by High Glucose via Telomere-p53-p21-Rb Signaling Pathway

Diabetic kidney disease (DKD)is a microvascular complication of type 2 diabetes.The study of DKD mechanisms is the most important target for the prevention of DKD.Renal senescence is one of the important pathogeneses for DKD,but the mechanism of renal and cellular senescence is unclear.Decreased expression of circulating miR-126 is associated with the development of DKD and may be a promising blood-based biomarker for DKD.This study is to probe the effect and mechanism of miR-126 on the aging of human glomerular mesangial cells (HGMCs)induced by high glucose.HGMCs were cultured with Roswell Park Memorial Institute (RPMI-1640)in vitro.The effect of high glucose on morphology of HGMCs was observed 72h after intervention.The cell cycle was examined by flow cytometry.The telomere length was measured by Southern blotting.The expression levels of p53,p21 and Rb proteins in p53-p21-Rb signaling pathway and p-statl,p-stat3 in JAK/STAT signaling pathway were detected by Western blotting respectively.The expression of miR-126 was examined by qRT-PCR.MiR-126 mimics was transfected into HGMCs.The effects of miR-126 mimics transfection on cell morphology,cell cycle,telomere length,p53,p21,Rb,p-stat1 and p-stat3 were observed. The results showed that high glucose not only arrested the cell cycle in G1phase but also shortened the telomere length.High glucose led to high expression of p53,p21,Rb,p-statl and p-stat3 and premature senescence of HGMCs by activating the telomere-p53-p21-Rb and JAK/STAT signaling pathways.Moreover,the miR-126 was decreased in HGMCs induced by high glucose.It was suggested that the transfection of miR-126 mimics could inhibit the telomere-p53-p21-Rb and JAK/STAT signaling pathway activity in vitro and delay the senescence of HGMCs.The results may serve as a new strategy for the treatment of DKD.

Downregulation of miRNA-21 and cancer stem cells after chemotherapy results in better outcome in breast cancer patients

Epigenetic modifications have been observed as a decline in miRNA-21 expression and breast cancer stem cell(CSC)population after 3 cycles of standard chemotherapy.The epigenetic response(miRNAs expression)and CSCs are also correlated in patients with Breast Cancer.In patients who tolerated chemotherapy well,miRNA-21(non-coding RNA)expression decreased significantly after three cycles of chemotherapy.The miRNA-21 expression in breast cancer tissue was quantified by quantitative PCR(real-time PCR)using the standard protocol.In addition,breast CSCs(CD44+/CD24-)were also decreased in these patients.The miRNA-21 regulates cell division,proliferation,and autophagy of cancerous cells(as it targets phosphatase and tensin homolog/AKT/transcription factor EB/programmed cell death 4/autophagy-related protein 5 and chemotherapy also produces similar effects),thereby contributing to these benefits.Therefore,when all of the targets on genes have been explored by mimic miRNA,chemotherapy combined with anti-miRNA21 therapy may prove useful in the care of cancer patients.

Cigarette Smoke Extract Inhibits the Proliferation of Alveolar Epithelial Cells and Augments the Expression of P21^(WAF1)

Cigarette smoking is intimately related with the development of chronic obstructive pulmonary diseases, and alveolar epithelium is a major target for the exposure of cigarette smoke extract. In order to investigate the effect of cigarette smoke extract on the proliferation of alveolar epithelial cell type Ⅱ and its relationship with P21^WAF1, the alveolar epithelial type Ⅱ cell line （A549） cells were chosen as surrogate cells to represent alveolar epithelial type Ⅱ cells. MTT assay was used to detect cell viability after interfered with different concentrations of cigarette smoke extract. It was observed cigarette smoke extract inhibited the growth of A549 cells in a dose- and time-dependent manner. The morphological changes, involving the condensation and margination of nuclear chromatin, even karyorrhexis, were observed by both Hoechst staining and electronic microscopy. Flow cytometry analysis demonstrated the increased cell percentages in G1 and subG1 phases after the cells were incubated with cigarette smoke extract. The expression of p21^WAF1 protein and mRNA was also significantly increased as detected by the methods of Western blot or reverse transcription-polymerase chain reaction respectively. In conclusion, cigarette smoke extract inhibits the proliferation of alveolar epithelial cell type Ⅱ and blocks them in G1/S phase. The intracelhilar accumulation of P21^WAF1 may be one of the mechanisms which contribute to cigarette smoke extract-induced inhibition of cell proliferation.

PBMCs中miR-21、miR-223表达与HIV/AIDS患者抗逆转录病毒治疗效果的相关性

目的探讨人类免疫缺陷病毒(HIV)/获得性免疫缺陷综合征(AIDS)患者抗逆转录病毒治疗效果与外周血单个核细胞(PBMCs)中微小RNA(miR)-21、miR-223表达水平的关系。方法选取2020年3月至2022年3月期间南通市第三人民医院门诊就诊行抗逆转录病毒治疗的142例HIV/AIDS患者为观察组,根据其治疗效果分为有效组(n=110)和无效组(n=32);选取同期体检健康者139例为对照组。采用实时荧光定量聚合酶链反应法检测PBMCs中miR-21、miR-223表达水平;采用多因素Logistic回归分析HIV/AIDS患者抗逆转录病毒治疗无效的影响因素。结果观察组PBMCs中miR-21、miR-223表达水平高于对照组(P<0.05)。无效组治疗后3个月、治疗后6个月、治疗后12个月的PBMCs中miR-21、miR-223表达水平均高于有效组(P<0.05)。有效组随治疗时间延长,PBMCs中miR-21、miR-223表达水平逐渐降低(P<0.05)。无效组治疗前世界卫生组织(WHO)分期3期患者比例高于有效组(P<0.05)。miR-21、miR-223、治疗前WHO分期3期是影响HIV/AIDS患者抗逆转录病毒治疗无效的独立危险因素(P<0.05)。结论miR-21、miR-223在一定程度上可反映HIV/AIDS患者抗逆转录病毒治疗效果,治疗无效患者PBMCs中miR-21、miR-223表达水平相对较高。

CYFRA21-1、CA199、SCC、CRP联合检测在肺癌诊断中的应用价值

目的分析诊断肺癌中糖类抗原199(CA199)、细胞角蛋白19片段抗原21-1(CYFRA21-1)、C反应蛋白(CRP)、鳞状细胞癌抗原(SCC)联合检测的价值。方法选取30例肺癌患者作为肺癌组,并纳入50例健康体检者作为健康组。两组均进行CYFRA21-1、SCC、CRP、CA199检查。对比两组CA199、CYFRA21-1、SCC、CRP水平;对比CA199、CYFRA21-1、SCC、CRP单独检测与联合检测对肺癌的诊断效能。结果肺癌组CA199(9.31±0.19)U/ml、CRP(23.49±1.36)mg/L、CYFRA21-1(4.43±0.09)ng/ml、SCC(29.50±0.16)ng/ml明显高于健康组的(3.27±0.11)U/ml、(5.48±1.15)mg/L、(1.20±0.16)ng/ml、(0.56±0.04)ng/ml,差异具有统计学意义(P<0.05)。CA199单独检测的诊断准确度、灵敏度和特异度分别为67.50%、46.67%、80.00%,CRP分别为73.75%、60.00%、82.00%,SCC分别为63.75%、40.00%、78.00%,CYFRA21-1分别为76.25%、66.67%、82.00%,联合检测分别为87.50%、90.00%、86.00%;CA199、CYFRA21-1、SCC、CRP联合检测的诊断准确度、特异度和灵敏度均高于单独检测。结论CA199、CYFRA21-1、SCC、CRP对肺癌诊断具有重要参考价值,通过联合检测能提高诊断特异度、准确度、敏感度。

Effects of miR-21 antisense oligonucleotides on proliferation,migration and autophagy of human umbilical vein endothelial cells

Objective:To investigate the effects of microRNA-21 antisense nucleotide(AS-miR-21)on the proliferation,migration and autophagy of human umbilical vein endothelial cells(HUVECs).Methods:HUVECs were treated with1,000 nmol/L rapamycin for 6 h(rapamycin group)or ASmiR-21 transfection followed by 1,000 nmol/L rapamycin for6 h(AS-miR-21+rapamycin group).HUVECs without any treatment were defined as control group.The proliferation and migration abilities of HUVECs were detected by methyl thiazolyl tetrazolium(MTT)assay,scratch wound healing assay and transwell test,respectively.The expressions of microtubule-associated protein light chain 3 Ⅱ/Ⅰ(LC3 Ⅱ/Ⅰ)and Becline-1 were determined by western blotting.Results:The rapamycin group showed decreased OD value and migration rate,an increased ratio of LC3 Ⅱ/Ⅰ and up-regulated expression of Beclin-1 compared with the control group(P<0.05).The AS-miR-21+rapamycin group demonstrated lower OD value,migration rate,the number of migrated cells,and significantly higher ratio of LC3 Ⅱ/Ⅰ and Beclin-1 protein expression level than the control group and the rapamycin group(P<0.05).Conclusion:AS-miR-21 suppressed the autophagy,proliferation and migration in the HUVECs model of autophagy induced by rapamycin.

Doxorubicin Induces Apoptosis through down Regulation of miR-21 Expression and Increases miR-21 Target Gene Expression in MCF-7 Breast Cancer Cells

miRNAs play an important regulatory role in variety of cellular functions and several diseases, including cancer. MicroRNA-21 (miR-21) is overexpressed in almost all types of human cancers. Studies revealed that the knockdown of miR-21 results in reduced tumor cell growth, cell cycle arrest and cell apoptosis. In this study, we evaluated the effect of doxorubicin on miR-21 expression in mcf-7 breast cancer cells. miRNA was extracted from mcf-7 cells treated with doxorubicin and untreated cells using miRNeasy Kit (Qiagen) according to the manufacturer’s instructions. cDNA synthesis was performed using miScript II RT Kit (Qiagen) and Real Time-PCR was performed using Real Q Plus 2x Master Mix Green-(Ampliqon, Denmark). The relative expression of miR-16 and miR-21 was calculated using comparative Ct method. All tests were run in triplicate to minimize the experimental errors. Samples with a Ct > 37 were excluded from the analysis. Statistically, a significant decrease in cell proliferation of mcf-7 cells was found in doxorubicin group compared with control groups 24 hours after transfection, dose dependently (p value< 0.001). After 24 hours, Doxorubicin (100 μm) significantly decreased miR-21 expression in mcf-7 cells (p = 0.0001). Also, the expression of caspase 9 significantly increased after Doxorubicin (100 μm) treatment (p = 0.0003). Together, these findings indicate that miR-21 plays a key role in regulating cell apoptosis in mcf-7 cells and may serve as a target for effective therapies.

阿帕替尼联合埃克替尼治疗EGFR基因21号外显子L858R突变型NSCLC的临床观察

目的探究对表皮生长因子受体(EGFR)基因21号外显子L858R突变型非小细胞肺癌(NSCLC)采用阿帕替尼联合埃克替尼治疗的临床效果。方法将EGFR基因21号外显子L858R突变型NSCLC患者101例按随机数表法分为观察组(n=51)与对照组(n=50)。观察组采用阿帕替尼联合埃克替尼治疗,对照组仅采用埃克替尼治疗,治疗时间为56 d,2个周期。比较2组近期疗效、不良反应,并采用K-M生存分析曲线图分析2组远期疗效。结果观察组与对照组的客观缓解率(ORR)(74.51%vs 74.00%)与疾病控制率(DCR)(92.16%vs 94.00%)差异均无统计学意义(P>0.05);治疗期间2组未出现2级以上不良反应,观察组高血压和蛋白尿发生率分别为52.94%、50.98%,分别高于对照组的16.00%、10.00%,差异有统计学意义(P<0.05)。观察组生存率显著高于对照组(69.3%vs 43.1%),差异有统计学意义(P<0.05)。结论EGFR基因21号外显子L858R突变型NSCLC采用阿帕替尼联合埃克替尼治疗,可延长患者的无进展生存时间,不良反应的发生可接受。

<i>In vivo</i>effect of 17-β-estradiol, progesterone, hCG and expression of P53 and P21 in endometrial Ishikawa cells

The following article has been retracted due to the investigation of complaints received against it. The Editorial Board found that the first author published the paper without other authors’ consent and approval. The scientific community takes a very strong view on this matter, and the OJOG treats such behavior seriously. This paper published in Vol. 3 No. 1, 105-110 (pages), 2013, has been removed from this site.

cfa-miR-21对犬血管内皮细胞增殖、迁移的调控作用及机制

为研究犬脐带间充质干细胞外泌体(UC-MSC-Exo)中携带的cfa-miR-21促进犬血管内皮细胞(VECs)增殖及迁移的作用机制,该实验以犬VECs为模型,首先通过qRT-PCR筛选出cfa-miR-21最佳转染方案,然后使用EdU法和划痕实验,检测cfa-miR-21对细胞的增殖及迁移的调控作用;通过生物信息学分析软件预测靶基因,并利用双荧光素酶报告基因系统和qRTPCR进行验证,再通过Western Blot检测下游ERK信号通路蛋白的表达情况。实验结果表明,cfa-miR-21可促进犬VECs的增殖和迁移,其可通过靶向作用于SPRY1,从而激活ERK信号通路,发挥其在血管生成中的生物功能。该研究为miRNAs在血管生成中的作用提供了见解,揭示了间充质干细胞(MSCs)的功能机制,并可能有助于未来的药物开发。