miR-1290在乳腺癌组织中表达及对乳腺癌细胞生物学行为的影响

目的 观察miR-1290在乳腺癌组织中表达情况,探讨其对乳腺癌细胞增殖、凋亡及骨髓基质抗原2(stromal antigen 2,STAG2)表达的影响.方法 取120例乳腺癌患者的癌组织及癌旁组织,采用实时荧光定量PCR法检测miR-1290相对表达量.对数生长期MCF-7细胞,随机分为对照组、模拟物对照组、模拟物...     

苦瓜多糖对人乳腺癌MDA-MB-231细胞生物学行为的影响

目的探讨苦瓜多糖对人乳腺癌MDA-MB-231细胞生物学行为的影响及其机制。方法采取体外培养MDA-MB-231细胞进行分组,苦瓜多糖组给予不同浓度苦瓜多糖(0μg/ml、30μg/ml、60μg/ml、120μg/ml),空白组(苦瓜多糖0μg/ml)培养基中含有与苦瓜多糖组等浓度的DMSO,将各组细胞孵育分别培养至12 h、24 h、48 h处理。MTT法检测细胞增殖率,FMC法检测后细胞周期分布与细胞凋亡率,Hoechst 33342观察凋亡小体变化,Trans well法检测细胞迁移率,免疫组化检测Ki67与Caspase-3阳性率,Western-blot检测MMP-9、Bcl-2、Bax表达水平,RT-PCR检测细胞周期蛋白(CyclinD1)、血管内皮生长因子(VEGF)表达量;体内建立移植瘤裸鼠模型,试验组裸鼠采用苦瓜多糖(120μg/ml)灌胃治疗,早晚一次,1 ml/次,对照组裸鼠灌胃等体积的生理盐水,两组裸鼠治疗6周后测量肿瘤质量、观察肿瘤体积变化。结果与空白组相比,苦瓜多糖组癌细胞增值率与迁移能力随苦瓜多糖剂量增加而降低(P 0. 05),细胞凋亡率、凋亡小体数量随着药用剂量增加而升高(P 0. 05); Western-blot检测结果显示苦瓜多糖组MMP-9、Bcl-2表达水平低于空白组(P 0. 05),Bax表达水平高于空白组(P 0. 05); RT-PCR结果显示苦瓜多糖组CyclinD1、VEGF表达量显著低于空白组(P 0. 05)。试验组肿瘤组织中的Ki67蛋白水平、肿瘤体积、肿瘤质量显著低于对照组(P 0. 05),而试验组肿瘤组织中Casppase-3蛋白水平显著高于对照组(P 0. 05)。结论苦瓜多糖可以通过调控细胞周期、凋亡、迁移侵袭相关蛋白及基因表达,进而调控人乳腺癌MDA-MB-231细胞生物学行为。     

沉默lncRNA THAP9-AS1对乳腺癌细胞增殖、凋亡、迁移及侵袭的影响

目的:探讨沉默长链非编码RNA THAP9反义RNA1(lncRNA THAP9-AS1)对乳腺癌细胞增殖、凋亡、迁移及侵袭的影响。方法:选取贵州省肿瘤医院2017年6月至2020年6月25例乳腺癌患者的癌组织及癌旁组织,采用实时荧光定量PCR(real-time quantitative polymerase chain reaction,RT-qPCR)检测lncRNA THAP9-AS1和miR-505-3p表达水平。将MDA-MB-231细胞随机分为si-THAP9-AS1组、si-NC组、miR-505-3p组、 miR-NC组、si-THAP9-AS1+anti-miR-NC组、si-THAP9-AS1+miR-505-3p inhibitor组。采用四甲基偶氮唑盐比色(methyl thiazolyl tetrazolium,MTT)法检测细胞活性,平板克隆实验检测细胞集落形成数,流式细胞术实验检测细胞凋亡,划痕实验和Transwell检测细胞迁移及侵袭,双荧光素酶报告实验检测lncRNA THAP9-AS1和miR-505-3p的靶向关系。结果:与癌旁组织相比,乳腺癌组...     

加味温胆汤对抑郁模型大鼠海马环腺苷酸反应元件结合蛋白1mRNA表达的影响

目的:探讨加味温胆汤对抑郁模型大鼠海马环腺苷酸反应元件结合蛋白(CREB)1 mRNA表达的影响。方法:以孤养结合慢性不可预见性应激抑郁模型大鼠为研究对象,在实验第7、14、21、28天采用QRT-PCR技术检测各组大鼠海马CREB1 mRNA表达变化。结果:海马CREB1 mRNA表达变化,21、28 d时,与空白组比较,模型组大鼠海马CREB1 mRNA表达减少(P<0.01);与模型组比较,中、西药组大鼠海马CREB1 mRNA表达增加(P<0.01)。结论:加味温胆汤可通过上调海马CREB1 mRNA表达而发挥其抗抑郁效应。     

YB-1蛋白对白血病细胞K562/A02生物学行为的影响

本研究探讨YB-1基因表达下调后对白血病细胞K562/A02生物学行为的影响及其机制。采用脂质体介导的方法将已构建的人YB-1基因特异性shRNA及随机片段HK的真核表达载体转染进白血病细胞K562/A02中,RT-PCR和免疫印迹反应检测YB-1 mRNA和蛋白表达量的改变;采用MTT法和细胞周期测定分析对白血病细胞增殖的影响;用AnnexinⅤ检测白血病细胞的凋亡程度;采用MTT法检测细胞IC50值变化;RT-PCR和流式细胞术检测基因转染前后细胞中的MDR1 mRNA和P-gp表达的变化。结果表明,阳性转染的3组细胞YB-1基因和蛋白的表达量明显低于随机片段组和未转染细胞;生长曲线提示阳性转染组细胞生长缓慢,细胞周期动力学分析显示阳性转染组G1期细胞增多,G2期与S期细胞显著减少;在小剂量As2O3作用下,阳性转染组细胞的凋亡数量明显高于对照组细胞;阳性转染细胞的阿霉素IC50明显低于随机片段组和阴性对照组;阳性转染细胞MDR1 mRNA水平明显降低,P-gp的峰值较对照组明显左移。结论:YB-1特异性shRNA能有效降低白血病细胞中YB-1的表达,减慢细胞生长,增加白血病细胞对化疗药物的敏感性,加速细胞凋亡。     

细胞周期蛋白L1对人绒毛膜滋养细胞生物学行为的影响

目的 探讨细胞周期蛋白L1(CCNL1)对人绒毛膜滋养细胞生物学行为的影响及调控机制.方法 以人绒毛膜滋养细胞HTR-8/SVneo为模型,根据转染的类型分为CCNL1过表达组,过表达对照组,CCNL1干扰组1,CCNL1干扰组2,CCNL1干扰组3,干扰对照组,采用实时荧光定量(qPCR)及Western Blot方...     

噬菌体特异性结合肽对乳腺癌干细胞生物学行为的影响

目的检测GY-1(GYSASRSTIPGK)与乳腺癌干细胞的亲和性及特异性,探讨其对乳腺癌干细胞体外生物学行为的影响,评估GY-1作为乳腺癌干细胞靶向治疗载体的临床价值。方法根据前期噬菌体肽库筛选实验获得的十二肽GY-1(GYSASRSTIPGK)序列,人工合成GY-1,同时合成随机氨基酸序列十二肽GY-2(GSAYITRSGPSK)作阴性对照,采用酶联免疫吸附试验(ELISA)及细胞免疫荧光法分别鉴定两者与乳腺癌干细胞231-SC(分离自MDA-MB-231细胞株)的亲和性及特异性;通过生长曲线及侵袭迁移实验检测十二肽GY-1对乳腺癌干细胞231-SC恶性生物学行为的影响。结果 ELISA结果显示,GY-1组231-SC吸光度为0.501±0.009,高于MDA-MB-231细胞(0.147±0.038)和hs578bst细胞(0.152±0.036),F=262.25,P<0.001;GY-2组中三组细胞的吸光度分别为0.148±0.003、0.146±0.005和0.149±0.001,F=0.63,P>0.05。细胞免疫荧光法显示GY-1对231-SC有高度亲和特异性,生长曲线结果显示,GY-1组231-SC细胞增殖能力显著低于GY-2组和PBS空白组,差异有统计学意义(P<0.05)。侵袭实验中GY-1组231-SC细胞透过Transwell上室的细胞数为(22±2)个,低于GY-2对照组[(41±4)个]和空白对照组[(43±6)个],F=9.03,P=0.003。迁移实验中GY-1组231-SC细胞透过Transwell上室的细胞数为(66±7)个,低于GY-2对照组[(134±11)个]和空白对照组[(141±14)个],F=14.59,P<0.001。GY-2对照组和空白组差异比较均无统计学意义(P=0.78和P=0.66)。结论十二肽GY-1对靶细胞231-SC具有高度亲和特异性,并且能够抑制231-SC的生长、侵袭迁移,有可能成为乳腺癌干细胞靶向治疗的理想载体。     

沉默FRAT1基因对结肠癌HT-29细胞增殖与凋亡的影响及其机制研究

目的 探讨沉默FRAT1基因对结肠癌HT-29细胞增殖、凋亡的影响及其可能分子机制.方法 将成功转染FRAT1基因RNA干扰序列的人结肠癌HT-29细胞扩大培养,MTT比色法检测细胞增殖,双染流式细胞术检测细胞凋亡率,单染流式细胞术分析细胞周期,免疫荧光法激光共聚焦显微镜下观察β-catenin蛋白变化.结果 转染组细胞较对照组细胞生长明显减缓（P＜0.01）,凋亡率明显增加（P＜0.01）,细胞周期出现G0/G1期阻滞,差异显著（P＜0.01）,胞质β-catenin蛋白表达明显下调.结论 FRAT1基因RNA干扰序列可以有效诱导结肠癌HT-29细胞凋亡和细胞周期阻滞,抑制细胞增殖,其机制可能通过下调β-catenin表达实现.     

磷酸化环磷腺苷反应元件结合蛋白对持续惊厥后海马细胞凋亡调控基因表达的影响

目的观察外源性磷酸环磷腺苷反应元件结合蛋白(p CREB)抗体对惊厥持续状态(SC)后海马细胞凋亡调控基因Bcl-2和c-Jun表达的影响,探讨p CREB在惊厥性脑损伤中的作用及其调控机制。方法成年Wistar鼠48只随机分为正常对照组(NC组,n=24)和惊厥持续状态组(SC组,n=24)。SC组采用氯化锂-匹罗卡品腹腔注射诱发SC模型。两组均根据脑室注射内容分为无注射组、生理盐水注射组(NS组)和抗p CREB注射组(抗p CREB组)3个亚组,每个亚组8只。注射后6 h处死动物。取双侧海马采用免疫组化和原位杂交(ISH)观察Bcl-2蛋白/m RNA、c-Jun蛋白/m RNA的分布,并进行半定量分析。结果 NC组中,3个亚组注射侧Bcl-2蛋白/m RNA表达均无显著性差异(P0.05),SC组中抗p CREB组低于无注射组和NS组(P0.05)。NC组和SC组中,3个亚组注射侧c-Jun蛋白/m RNA表达均有非常高度显著性差异(P0.001),NS组和抗p CREB组c-Jun蛋白/m RNA表达高于无注射组(P0.05),抗p CREB组高于NS组(P0.05)。结论 SC后脑室内注射外源性抗p CREB抗体可下调SC后海马Bcl-2蛋白/m RNA表达,上调c-Jun蛋白/m RNA表达。     

Paeoniflorin inhibits proliferation and invasion of breast cancer cells through suppressing Notch-1 signaling pathway

Paeoniflorin (PF), one of the major active ingredients of Chinese peony, was reported to possess anti-tumor effect. However, the role of PF in breast cancer remains to be clarified. Therefore, in this context, the present study investigated the effects of PF on breast cancer cell proliferation and invasion, as well as the underlying mechanism. Our results found that PF suppressed the proliferation and invasion of breast cancer cells. We further demonstrated that PF down-regulated the expression of Notch-1; in addition, overexpression of Notch-1 reversed PF-inhibited proliferation and invasion, and knockdown of Notch-1 enhanced PF-inhibited proliferation and invasion in breast cancer cells. In conclusion, the present study suggests that PF inhibits proliferation and invasion of breast cancer cells through suppressing Notch-1 signaling pathway. Therefore, PF may represent a chemopreventive and/or therapeutic agent in the prevention of breast cancer.     

Polyporus umbellatus inhibited tumor cell proliferation and promoted tumor cell apoptosis by down-regulating AKT in breast cancer

Breast cancer (BC) is the foremost cause of cancer-related mortality in women worldwide. Polyporus umbellatus is a polysaccharide preparation of the Chinese traditional herb medicine, which has been explored as an inhibitory compounds in suppressing many cancers. And AKT has been known as an essential signaling pathway to regulate cell proliferation and apoptosis via Mdm2/p53 and Caspase-3 signaling pathways respectively. In our study, western blot, RT-PCR, immunochemical assay, immunofluorescence as well as flow cytometry were performed in vitro or in vivo to determine the effects of Polyporus umbellatus on the progression of human laryngeal cancer. First, the breast cancer cell growth, invasion and migration were inhibited, as well as the tumor volume in nude mice was down-regulated for Polyporus umbellatus use. Additionally, our data also showed that Polyporus umbellatus suppressed breast cancer cells proliferation, which was linked with the down-regulation of AKT activation by Polyporus umbellatus treatment. Mdm was inactivated while p53 was stimulated for Polyporus umbellatus administration, displaying inhibitory role in tumor growth. Furthermore, Polyporus umbellatus could up-regulate breast cancer cells in G0/G1 phase during cell cycle, and at the same time reducing cells in S phase. Also, flow cytometry and western blot assays suggested that apoptosis was induced by the administration of Polyporus umbellatus, which enhanced Caspase-3 expressions by AKT-regulated anti-apoptotic and pro-apoptotic signals. In conclusion, our data indicated that Polyporus umbellatus had a potential role in controlling human breast cancer through inhibiting tumor cell proliferation, inducing apoptosis regulated by AKT, which might provide a therapeutic strategy for breast cancer suppression in the future.     

Vinculin表达对非小细胞肺癌A549细胞生物学特征的影响

目的通过体外实验探讨非小细胞肺癌(NSCLC)A549细胞系的Vinculin表达对其生物学特征的影响。方法购买人NSCLC A549细胞系,体外培养,分为对照组、空白载体组以及高表达组三组,高表达组A549细胞系转染Vinculin过表达载体,空白载体组A549细胞系转染空白载体。体外培养48 h后,应用RT-PCR检测各组A549细胞系Vinculin mRNA表达情况,应用MTT法检测细胞活性,Ki-67免疫荧光检测细胞增殖能力,Transwell培养体系Hoechst染色观察A549细胞系迁移侵袭能力。结果 RT-PCR检测结果显示,与对照组、空白载体组比较,高表达组Vinculin mRNA表达量明显增高(P<0.01);MTT法检测结果显示,与对照组、空白载体组比较,高表达组的OD值明显降低(P<0.01);Ki-67免疫荧光检测结果显示,与对照组、空白载体组比较,高表达组Ki-67⁺细胞数量明显减少(P<0.01);Transwell培养体系Hoeschst染色结果显示,与对照组、空白载体组比较,高表达组迁移和侵袭的细胞数量明显减少...     

ASPP1和ASPP2基因高表达对白藜芦醇诱导乳腺癌MCF-7细胞凋亡能力的影响

目的观察ASPP1和ASPP2基因高表达对白藜芦醇诱导乳腺癌MCF-7细胞凋亡能力的影响。方法采用瞬时转染法将pcDNA3／ASPPI和pcDNA3／ASPP2质粒分别转染入乳腺癌细胞MCF-7中,经G418筛选获得高表达ASPP1和ASPP2的MCF7阳性克隆细胞株MCF-7／ASPP1与MCF7／ASPP2。MCF-7、MCF-7／ASPP1与MCF-7／ASPP2细胞分刖加入0、25、50μmol／L 白藜芦醇,采用MTT法检测细胞增殖情况,RT-PCT法检测细胞p53下游基因bax与p21mRNA表达情况;3种细胞分别加入0、100、200μmol／L 白藜芦醇,采用ELISA法检测细胞凋亡率。结果MTT结果显示,25、50μmol／L。白藜芦醇处理后,MCF7／ASPP1与MCF-7／ASPP2细胞存活细胞吸光度值均明显低于MCF-7细胞（P〈0．05）;RTPCR结果显示,25、50μmol／L白藜芦醇处理后,MCF7／ASPPI与MCF-7／ASPP2细胞中Bax和p21mRNA表达水平高于MCF-7细胞;细胞凋亡试验结果显示,100、200μmol／L白藜芦醇处理后,MCF7／ASPP1与MCF-7／ASPP2细胞凋亡细胞吸光度值均明显高于MCF-7细胞（P〈0．05）。结论ASPP1和ASPP2高表达可增强乳腺癌细胞对自藜芦醇的敏感性,且随浓度增高而敏感性增强。     

Silencing of miRNA-218 promotes migration and invasion of breast cancer via Slit2-Robo1 pathway

MiRNAs play an important role in regulating tumor migration and invasion, and abnormal expression of miRNAs occurs in various kinds of human cancers. In this essay, it is reported that the level of miRNA-218 decreases in metastatic breast cancer cells, moreover, miRNA-218 suppresses breast cancer cells migration and invasion through binding Robo1 (one of Slit receptors) to its 3′UTR. MiRNA-218 restoration suppresses Robo1 expression and inhibits breast cancer cells invasion and migration. What the results describe is that the function of Robo1 regulated by miRNA-218 may provide a new strategy for inhibiting migration and invasion of breast cancer cells.     

Effect of CLN3 silencing by RNA interference on the proliferation and apoptosis of human colorectal cancer cells

Apoptosis constitutes a system for the removal of aged, or damaged cells, which is regulated by the interplay of pro-apoptotic and antiapoptotic proteins. Previous study has shown that Juvenile Batten disease protein, CLN3, is antiapoptotic gene in NT2 neuronal precursor cells and a few types of cancers. However, in colorectal cancer, whether CLN3 also play its antiapoptotic role and the effect of targeted controlling CLN3 on the biological behavior of human colorectal cancer cell is unknown. We employed the sequence-specific siRNA silencing the CLN3 gene and investigated its effects on growth and apoptosis of colorectal cancer HCT116 cells, which has highest elevation of CLN3 expression among four colorectal cancer cell lines. After CLN3 specific siRNA transfection, mRNA and protein expression levels of CLN3 in HCT116 cells were noticeably decreased. Moreover, CLN3-siRNA inhibited the proliferation of colorectal cancer cells, promoted their apoptosis and induced G0/G1 cell cycle arrest. Our current study demonstrated that CLN3 was expressed in colorectal cancer cells at a high frequency. Moreover, CLN3 down-regulation with RNA interference can inhibit proliferation, apoptosis, and cell cycle progression of colorectal cancer cells. Our study represented a potential new approach to understanding the role of CLN3 in cancer and provides a potential novel strategy colorectal cancer therapy.     

着丝粒蛋白CENP-H对乳腺癌细胞株MCF7增殖能力的影响

目的 研究CENP-H对乳腺癌细胞增殖能力的影响,初步探讨CENP-H与乳腺癌发生、发展的关系.方法 将反转录病毒质粒pMSCV和pMSCV-CENP-H经脂质体转染至293FT细胞制备病毒,并感染MCF7细胞,用嘌呤霉素筛选及Western blot鉴定,建立CENP-H基因稳定表达的MCF7细胞株;应用噻唑盐(MTT)法、平板集落形成实验、5-溴-2-脱氧尿苷(BrdU)掺入法检测CENP-H对MCF7细胞增殖的影响.结果 成功建立稳定表达CENP-H的MCF7细胞株,并发现CENP-H过表达可上调细胞增殖相关分子cyclin D1的表达;MTT、平板克隆实验及Brdu掺入实验结果显示CENP-H过表达后,MCF7的增殖能力模型增强.结论 CENP-H可上调cyclin D1的表达,增强MCF7的增殖能力,提示CENP-H可能在乳腺癌发生、发展中起重要作用.     

沉默RAGE对人卵巢癌细胞株增殖、凋亡能力及周期分布的影响

目的 研究沉默晚期糖基化终产物受体(receptor for advanced glycosylation end products,RAGE)对人卵巢癌细胞株增殖、凋亡能力及周期分布的影响.方法 人上皮性卵巢癌SKOV-3细胞经过慢病毒载体构建,分为空白组、过表达组和沉默组.进行细胞增殖、细胞凋亡、细胞周期实验,We...     

lncRNA RPL34-AS1调控miR-670-5p/SMAD4对胃癌细胞生物学行为的影响

目的探讨lncRNA RPL34-AS1对胃癌细胞生物学行为的影响及其对miR-670-5p/SMAD4分子轴的调控作用。方法回顾性收集2018年5月至2019年6月期间临沂市肿瘤医院收治的33例胃癌患者的癌组织及其癌旁组织标本。QRT-PCR检测RPL34-AS1、miR-670-5p的表达量,蛋白质印迹法检测SMAD4表达。体外培养人胃癌细胞HGC-27,实验分组:pc DNA组(转染RPL34-AS1过表达载体的阴性对照)、pc DNA-RPL34-AS1组(转染RPL34-AS1过表达载体)、anti-miR-NC组(转染miR-670-5p特异性寡核苷酸抑制剂的阴性对照)、anti-miR-670-5p组(转染miR-670-5p特异性寡核苷酸抑制剂)、pc DNA-RPL34-AS1+miR-NC组(共转染pc DNA-RPL34-AS1与阴性对照mimic NC序列)、pc DNA-RPL34-AS1+miR-670-5p组(共转染pc DNA-RPL34-AS1与miR-670-5p寡核苷酸模拟物)。MTT与平板克隆形成实验检测细胞增殖与克隆形成数,流式细胞术检测细胞凋...