miR-145过表达对宫颈癌细胞辐射敏感性的影响

目的:探讨微小RNA(miR)-145过表达增强宫颈癌细胞放疗敏感性的分子机制。方法:运用Lipofectamine 2000将miR-145-mimic转染4株宫颈癌细胞系He La、Ca Ski、C33A和Si Ha,以NC-mimic为阴性对照,并以real-time PCR检测子宫内膜基质细胞(ESC)和4株宫颈癌细胞中miR-145的表达水平;转染的细胞经电离辐射照射后于不同时点运用MTT法和Annexin V-FITC/PI染色法联合流式细胞术分别测定细胞活力和细胞凋亡率;运用免疫荧光检测组蛋白γH2AX的表达水平;Western blot检测细胞中螺旋酶样转录因子(HLTF)的蛋白表达水平。结果:miR-145在ESC中高表达,而在4株宫颈癌细胞中均呈低表达,转染miR-145-mimic后4株宫项癌细胞中miR-145的表达水平显著高于NC-mimic组细胞(P0.05)。相同条件下,辐照后miR-145过表达的宫颈癌细胞的活力显著低于NC-mimic组细胞,72 h的细胞凋亡率明显增加(P0.05)。免疫荧光观察结果显示miR-145过表达显著促进电离辐射诱导的γH2AX激活;Western blot结果显示,miR-145过表达显著抑制HLTF的表达,与NC-mimic比较差异有统计学意义(P0.05)。结论:miR-145在正常子宫内膜上皮细胞中高表达,而在宫颈癌细胞系中低表达;miR-145过表达可显著抑制宫颈癌细胞的活力,促进电离辐射诱导的细胞凋亡。miR-145过表达增强宫颈癌细胞的辐射敏感性,其机制可能与下调HLTF表达、抑制DNA损伤修复、促进细胞凋亡有关。     

miR-214通过MAPK信号通路对非小细胞肺癌放疗敏感性的影响

目的：探讨miR-214通过MAPK信号通路对非小细胞肺癌放疗敏感性的影响。方法：体外培养构建放射抵抗性的肺癌H358细胞株（H358-RR）;qPCR实验检测H35和H358-RR细胞中miR-214的表达水平,qPCR检测miR-214-mimic在H358-RR中的转染效率及miR-214的表达情况;Western blot检测miR-214-mimic对ERK1、jnk和p38MAPK蛋白表达水平的影响;免疫荧光检测γ-H2AX聚集点的情况及对放射的敏感性;CCK-8实验检测H358-RR细胞株接受放射后活性的变化;单细胞凝胶电泳检测放射线照射后不同组肺癌细胞DNA损伤情况。结果：成功构建H358-RR放射抵抗细胞株,qPCR检测H358-RR细胞中miR-214的表达水平高于H358细胞,qPCR检测miR-214-mimic的转染效率良好,可以有效增加miR-214的表达水平,Western blot检测转染miR-214-mimic后ERK1、jnk和p38MAPK的表达水平相应升高;过表达miR-214之后,免疫荧光检测γ-H2AX聚集点的表达明显较少,DNA损伤较少;过表达miR-214后,H358-RR细胞接受放射后细胞活力降低水平减少;过表达miR-214后H358-RR抵抗放射线及对DNA损伤修复的能力增强。结论：miR-214通过影响MAPK信号通路调控非小细胞肺癌的DNA损伤及修复能力,影响其对放疗的敏感性。     

lncRNA ZFAS1靶向miR-193a-3p调控宫颈癌细胞Siha放射敏感性的分子机制研究

目的:探讨lncRNA ZFAS1对宫颈癌细胞放射敏感性的影响以及其作用机制.方法:实验设置pcDNA组、pcDNA-ZFAS1组、si-con组、si-ZFAS1组、IR+si-con组、IR+si-ZFAS1组、si-ZFAS1+anti-miR-con组、si-ZFAS1+anti-miR-193a-3p组、IR...     

上调miR-125b靶向Foxp3调控免疫因子表达增强宫颈癌细胞的放射敏感性

目的:探讨miR-125b对宫颈癌细胞放射敏感性的影响及其可能的下游机制研究。方法:实时荧光定量聚合酶链反应(quantitative real-time PCR,RT-qPCR)检测宫颈癌组织和细胞中miR-125b和Foxp3的表达量。HeLa细胞进行梯度剂量X射线(0、2、4、6 Gy)照射后,RT-qPCR检测...     

蕨麻多糖通过调控miR-421表达对LPS诱导的心肌细胞炎症反应及凋亡的影响北大核心CSCD

目的:探讨蕨麻多糖(PAP)对脂多糖(LPS)诱导的心肌细胞炎症反应及凋亡的影响及其可能作用机制。方法:采用LPS诱导大鼠心肌细胞H9C2建立细胞损伤模型,用浓度为0.05、0.1、0.2 mg/ml蕨麻多糖处理细胞,anti-miR-NC、antimiR-421分别转染至心肌细胞后用LPS处理细胞,miR-NC、miR-421 mimics分别转染至心肌细胞后用蕨麻多糖与LPS共同处理细胞;ELISA法检测细胞培养液中TNF-α、IL-6的水平;流式细胞术检测细胞凋亡率;qRT-PCR法检测miR-421的表达量。结果:蕨麻多糖呈浓度依赖性降低LPS诱导的心肌细胞培养液中TNF-α、IL-6的水平(P<0.05),并可降低细胞凋亡率(P<0.05),还可降低miR-421的表达量(P<0.05);转染anti-miR-421后LPS诱导的心肌细胞培养液中TNF-α、IL-6的水平降低(P<0.05),细胞凋亡率降低(P<0.05);转染miR-421 mimics能够逆转蕨麻多糖对LPS诱导的心肌细胞炎症反应及凋亡的作用。结论:蕨麻多糖可通过抑制miR-421的表达抑制心肌细胞炎症反应及细胞凋亡,进而减轻LPS诱导的心肌细胞损伤。     

miR-1246增强宫颈癌细胞辐射敏感性的分子机制研究

目的:探讨微小RNA-1246(miR-1246)过表达增强宫颈癌细胞放疗敏感性的分子机制。方法:运用脂质体2000将miR-1246模拟物(miR-1246 mimic)转染4种宫颈癌细胞系He La、Ca Ski、C33A和Si Ha,以阴性对照模拟物(NC-mimic)为阴性对照。Real-time PCR检测宫颈癌组织、正常组织、子宫内膜上皮细胞系ESC和4株宫颈癌细胞中miR-1246的表达水平;转染的细胞经电离辐射照射后运用MTT法和Transwell法分别测定细胞活力和细胞迁移能力;运用免疫荧光法检测γH2AX表达水平;Western blot检测细胞中γH2AX、ATM、p-ATM和p-p53的蛋白水平。结果:miR-1246在正常组织和ESC细胞中高表达,而在4株宫颈癌细胞和宫颈癌组织中低表达;转染miR-1246 mimic后miR-1246表达水平显著高于NC-mimic组细胞(P 0. 05)。相同条件下,辐照后miR-1246过表达组宫颈癌细胞活力显著低于NC-mimic组,细胞迁移率明显降低(P 0. 05)。免疫荧光结果显示,miR-1246过表达显著增强电离辐射诱导的γH2AX激活(P 0. 05);Western blot结果显示,与NC-mimic组比较,miR-1246过表达显著促进电离辐射诱导γH2AX蛋白的表达,减低p-ATM和p-p53的蛋白水平(P 0. 05)。结论:miR-1246在正常组织和子宫内膜上皮细胞中高表达,而在宫颈癌组织和宫颈癌细胞系中低表达;miR-1246过表达抑制宫颈癌细胞活力和迁移能力,并可能通过阻断ATM通路、抑制DNA损伤修复而增强宫颈癌细胞的辐射敏感性。     

miR-30c抑制宫颈癌细胞恶性表型的分子机制研究

目的:探讨微小RNA(miR)-30c过表达抑制宫颈癌细胞恶性表型的分子机制。方法:运用Lipofectamine 2000转染法将pGenesil-1-miR-30 c质粒转染宫颈癌细胞系C33A、HeLa、SiHa和CaSki,以转染p-Geresil-1的细胞为阴性对照;运用TaqMan real-time PCR检测各组细胞中miR-30c的表达水平;采用MTT法、集落形成实验、Transwell法、Annexin V-FITC及流式细胞术分别测定细胞活力抑制率、集落形成能力、迁移率及凋亡率;Western blot检测Bax、Bcl-2、基质金属蛋白酶(MMP)-9、MMP-13和金属蛋白酶组织抑制物1(TIMP-1)的蛋白表达水平。结果:转染p Genesil-1-miR-30c质粒的宫颈癌细胞系中miR-30c表达水平均显著高于阴性对照组(P0.01);过表达miR-30 c的宫颈癌细胞活力抑制率显著高于阴性对照组(P0.05),细胞集落形成率和迁移率显著低于阴性对照组(P0.05);流式细胞术检测结果显示,miR-30c过表达的宫颈癌细胞凋亡率显著高于对照组(P0.05);Western blot结果显示miR-30 c过表达促进Bax和TIMP-1蛋白的表达,而抑制Bcl-2和MMP-13蛋白的表达(P0.05或P0.01)。结论 :miR-30 c过表达抑制宫颈癌细胞活力和迁移,诱导宫颈癌细胞凋亡,其机制与激活细胞凋亡通路及抑制MMP-13表达有关。     

miR-497靶向细胞周期蛋白E1抑制宫颈癌HeLa细胞的增殖

目的研究miR-497在宫颈癌HeLa细胞中对细胞周期蛋白E1(CCNE1)的靶向作用及其对HeLa细胞增殖的影响。方法构建pre-miR-497、CCNE1野生型(WT-CCNE1)和突变型(MT-CCNE1)真核表达载体,采用荧光实时定量PCR(qRT-PCR)验证pre-miR-497载体的有效性,采用MTT法检测miR-497对HeLa细胞增殖的影响,采用双萤光素酶报告系统、qRT-PCR和Western blot法验证miR-497对CCNE1的靶向关系。结果测序结果提示pcDNATM6.2-GW-pre-miR-497、pmirGLO-CCNE1野生型和突变型表达载体构建成功,qRT-PCR证明转染pre-miR-497的HeLa细胞miR-497的表达显著升高。MTT法结果显示转染pre-miR-497的HeLa细胞增殖活性显著低于阴性对照miR组(P0.05)。此外,双萤光素酶法检测共转染pre-miR-497和WT-CCNE1的HeLa细胞,其萤光素酶活性显著低于对照组(P0.01),qRT-PCR及Western blot法也分别证实转染pre-miR-497的HeLa细胞其CCNE1的mRNA和蛋白水平显著下调(P0.05)。结论 miR-497能够通过靶向CCNE1调控宫颈癌HeLa细胞的增殖活性。     

Linc00152靶向miR-376c-3p对宫颈癌细胞活力、凋亡和放射敏感性的影响

目的:探讨长链非编码RNA Linc00152对宫颈癌细胞活力、凋亡和放射敏感性的影响及作用机制。方法:RT-qPCR检测宫颈癌HeLa细胞和SiHa细胞以及正常宫颈细胞Ect1/E6E7中Linc00152与微小RNA-376c-3p(miR-376c-3p)的表达水平。建立Linc00152低表达或miR-376c-3p过表达的宫颈癌HeLa细胞系,MTT法、流式细胞术、集落形成实验和Western blot分别检测Linc00152低表达或miR-376c-3p过表达对宫颈癌HeLa细胞的活力、凋亡、放射敏感性及相关蛋白表达的影响。双萤光素酶报告基因实验验证Linc00152与miR-376c-3p的调控关系。结果:与Ect1/E6E7细胞相比,宫颈癌HeLa细胞和SiHa细胞中的Linc00152表达上调,miR-376c-3p表达下调(P<0.05)。Linc00152低表达或miR-376c-3p过表达均可抑制HeLa细胞的活力,并诱导其凋亡,增强其放射敏感性,抑制cyclin D和Bcl-2蛋白表达,促进P21和Bax蛋白表达(P<0.05)。Linc0015...     

miR-25靶向RECK促进宫颈癌HeLa细胞的增殖

目的探讨微小RNA-25(miR-25)对宫颈癌He La细胞增殖活性的影响及其与逆向诱导的带Kazal基序的富含半胱氨酸蛋白(RECK)的靶向关系。方法构建pc DNATM6.2-GW-pre-miR-25、pmir GLO-野生型RECK(RECK-WT)和突变型RECK(RECK-MT)真核表达载体及miR-25抑制剂(anti-miR-25),采用荧光实时定量PCR(qRT-PCR)检测pre-miR-25和anti-miR-25在He La细胞中的转染效率,并采用MTT法分析miR-25对He La细胞增殖活性的影响,双萤光素酶报告基因、qRT-PCR和Western blot法检测miR-25与RECK靶向关系。结果测序结果显示pc DNATM6.2-GW-pre-miR-25、pmir GLO-RECK-WT和pmir GLO-RECK-MT重组载体构建成功,qRT-PCR提示pre-miR-25与anti-miR-25在He La细胞中具有良好的转染效率。MTT结果显示miR-25能够明显促进He La细胞的增殖。双萤光素酶报告基因检测显示共转染pre-miR-25与RECK-WT的He La细胞其萤光活性显著下降,同时qRT-PCR及Western blot也显示anti-miR-25在转录和转录后水平均能够显著增加He La细胞中RECK的表达。结论miR-25能够靶向RECK,促进宫颈癌He La细胞的增殖。     

Heterogeneity of microRNAs expression in cervical cancer cells: over-expression of miR-196a

In recent years, the study of microRNAs associated with neoplastic processes has increased. Patterns of microRNA expression in different cell lines and different kinds of tumors have been identified; however, little is known about the alterations in regulatory pathways and genes involved in aberrant set of microRNAs. The identification of these altered microRNAs in several cervical cancer cells and potentially deregulated pathways involved constitute the principal goals of the present study. In the present work, the expression profiles of cellular microRNAs in Cervical Cancer tissues and cell lines were explored using microRNA microarray, Affymetrix. The most over-expressed was miR-196a, which was evaluated by real time PCR, and HOXC8 protein as potential target by immunohistochemistry assay. One hundred and twenty three human microRNAs differentially expressed in the cell tumor, 64 (52%) over-expressed and 59 (48%) under-expressed were observed. Among the microRNAs over-expressed, we focused on miR-196a; at present this microRNA is poorly studied in CC. The expression of this microRNA was evaluated by qRT-PCR, and HOXC8 by immunohistochemistry assay. There is not a specific microRNA expression profile in the CC cells, neither a microRNA related to HPV presence. Furthermore, the miR-196a was over-expressed, while an absence of HOXC8 expression was observed. We suggest that miR-196a could be played as oncomiR in CC.     

miR-155-5p在宫颈癌血清中的表达及其对宫颈癌细胞的影响

 目的：检测miR-155-5p在不同宫颈疾病患者血清中的表达差异,并分析其对宫颈癌细胞增殖、细胞周期和凋亡的影响,探讨miR-155-5p在宫颈癌发生、发展中的可能作用机制。方法：采用SYBR GreenⅠ实时荧光定量PCR法,检测并分析比较miR-155-5p在不同宫颈疾病患者血清中的表达差异。利用miR-155-5p mimic或inhibitor提高或降低宫颈癌细胞中miR-155-5p的表达。CCK-8法和流式细胞术检测宫颈癌细胞的增殖、细胞周期和凋亡。结果：宫颈癌组血清中miR-155-5p的表达高于宫颈炎组和健康对照组（P<0.05）,宫颈上皮内瘤样病变组和宫颈癌组血清中miR-155-5p的表达差异无统计学意义（P>0.05）。与空白组、脂质体组和阴性对照组相比,转染100 nmol/L和200 nmol/L miR-155-5p mimic的SiHa细胞中,S期细胞比例升高,凋亡细胞比例降低（P<005）。转染100 nmol/L和200 nmol/L miR-155-5p inhibitor的SiHa细胞中,G2/M期细胞比例明显增多（P<005）。结论：(1)宫颈癌患者血清中miR-155-5p表达较健康对照人群上调,可能作为宫颈癌早期诊断的肿瘤分子标志物。(2)miR-155-5p对宫颈癌HeLa细胞增殖、细胞周期和凋亡无明显影响。(3)miR-155-5p可促进宫颈癌SiHa细胞进入S期,并抑制SiHa细胞凋亡,提示miR-155-5p可能在宫颈鳞癌发生、发展中起作用。     

miR-182 induces cervical cancer cell apoptosis through inhibiting the expression of DNMT3a

Cervical cancer is the second most common and malignant tumor among women worldwide. However, the effective therapies for this deadly disease are limited because the elaborate molecular mechanism of progress of cervical cancer remains largely unknown. In present study, we not only determine the miR-182 as an anticancer miRNA molecule but also provide the mechanistic link between miR-182 and its anticancer activity. Primarily, the expression of miR-182 is significantly down-regulated in cervical tumor in contrast to normal cervical tissue, and then miR-182 mimic-treated cell presents reduction of cell proliferation and promoting apoptosis. During this process, DNA methyltransferase 3a (DNMT3a) expression is markedly decreased, thereby likely contributing to miR-182-induced apoptosis. Consistently, over-expression of DNMT3a inhibits the miR-182-induced apoptosis, and inhibition of DNMT3a promotes cervical cancer cell apoptosis, which further demonstrated that DNMT3a involved in cervix carcinogenesis. Collectively, we have revealed a valuable mechanism by which down-regulation of DNMT3a contributes to the miR-182-induced cervical cancer cell apoptosis, which raise a becoming potential that miR-182 administration or inhibition of DNMT3a expression may be the underlying strategies for therapeutic intervention in cervical carcinoma.     

miR-96 enhances the proliferation of cervical cancer cells by targeting FOXO1

MiRNAs affect various biological pathways associated with the development, progression, clinical outcome and treatment response improvement in cervical cancer. This study was performed to evaluate the effects of miRNA 96 on cervical cancer and to clarify the mechanism. Vivo and vitro experiments were conducted in our trial. MiR-96 is upregulated in cervical cancer cell lines and cervical cancer tissues and is correlated with clinical features in cervical cancer patients. Overexpression of miR-96 enhances proliferation of cervical cancer cells, while inhibiting miR-96 reduces the proliferation of cervical cancer cells. Inhibition of miR-96 significantly decreased the percentage of cells in the S phase and increased the percentage of cells in G1/G0 peak in both SiHa and CaSki cells compared with NC cells and decreased the expressions of p21, p27 and cyclin D1. FOXO1 3’-UTR was sub cloned into a luciferase reporter vector and the putative miR-96 binding site in the FOXO1 3’-UTR was mutated. Treated with miR-96 inhibitor consistently enhanced the luciferase activity of the FOXO1 3’-UTR luciferase reporter plasmids in both SiHa and CaSki cells, whereas mutations in the miR-96-binding site abolished the effect. Vivo experiment also support these results. Therefore, inhibition of miR-96 might suppress growth, proliferation of CC cells and promote apoptosis of CC cells both in vitro and in vivo.     

蔓荆子黄素通过上调miR-1193表达调控胃癌细胞的增殖和凋亡

目的:探讨蔓荆子黄素对胃癌细胞增殖、凋亡的影响及可能机制.方法:不同浓度的蔓荆子黄素作用于胃癌细胞AGS后,CCK-8实验和流式细胞术分别检测细胞的增殖和凋亡,RT-qPCR检测miR-1193表达量,Western blot检测CyclinD1、p21、Bcl-2和Bax蛋白表达.将miR-1193模拟物转染至AGS...     

miR-192 enhances sensitivity of methotrexate drug to MG-63 osteosarcoma cancer cells

Chemo-resistance remains a considerable obstacle encountered in osteosarcoma (OS) therapy. Evidence has implied that a reduction in the expression of microRNAs (miRs/miRNAs) leads to exacerbated chemo-resistance. Hence, to better understand the role of miR-192 in the pathogenesis of OS during methotrexate (MTX) treatment, we restore miR-192 in the MG-63 cells and investigate the mechanisms, which are associated with MTX-resistance in OS. Exogenetic overexpression of miR-192 was established by transfecting miR-192 mimics into MG-63 cells using Lipofectamine. Trypan blue dye exclusion test was performed to evaluate the proliferation of the MG-63 cells. Chemo-resistance to MTX was determined using the MTT method after 48 h. ELISA cell death assay was performed to evaluate the apoptosis rate. The quantitative RT-PCR (RT-qPCR) was applied to determine the mRNA expression levels before and after the transfection. Our results illustrated that miR-192 is down-regulated in OS tumor cells. Transfection of miR-192 noticeably alleviated the mRNA expression levels of MMP9, c-Myc, K-Ras, CXCR-4, and ADAMTS compared with the control groups (P-values< 0.05). MTX Combination treatment with miR-192 noticeably elevated the cytotoxic effect of MTX and alleviated its IC₅₀ (P < 0.05). Moreover, miR-192 significantly increased the apoptotic effect of MTX. These results implied that miR-192 enhances the sensitivity of MG-63 cells to MTX. Collectively, our results elucidated that miR-192 contributes to chemo-sensitizing MG-63 cells to MTX, and could be considered as a promising agent to overcome MTX-resistance in OS.