DNAJB6b通过激活AKT通路增强结直肠癌细胞的侵袭迁移能力

目的: 探讨DnaJ热休克家族成员B6异构体b(DNAJB6b)过表达对结直肠癌细胞侵袭迁移能力的影响及相关分子机制。方法: 使用GEO数据库中的数据统计并分析结直肠癌组织中DNAJB6a和DNAJB6b mRNA表达水平的改变;体外培养结直肠癌细胞系DLD-1和HCT116,分别使用小干扰RNA(siRNA)和短发卡RNA(shRNA)敲降DNAJB6b的表达,以转染阴性对照siRNA和shRNA的细胞作为对照,使用Western blot检测敲降组与对照组细胞中相关蛋白表达水平的变化;使用PI3K/mTOR双重抑制剂BEZ235处理DLD-1和HCT116细胞,以溶剂处理细胞作为对照,进行Transwell侵袭和迁移实验,统计穿膜细胞数目;在稳定敲降DNAJB6b的DLD-1和HCT116细胞中,瞬时转染组成型活化的AKT(myr-AKT)表达载体,进行挽救实验,以转染相应空载体的细胞作为对照,使用Western blot检测相关蛋白的表达水平,同时进行Transwell实验评估细胞侵袭迁移能力的变化。结果: 与癌旁正常组织相比,结直肠癌组织中DNAJB6b mRNA的表达水平显著上调(P<0.05),而DNAJB6a mRNA的表达水平无显著变化。与对照组相比,在结直肠癌细胞系DLD-1和HCT116中敲降DNAJB6b的表达,可明显降低p-AKT(Ser473)的蛋白水平;BEZ235处理组细胞穿膜数目显著减少,仅为对照组的20%左右(P<0.01)。挽救实验结果显示,在稳定敲降DNAJB6b的DLD-1和HCT116细胞中过表达外源myr-AKT,与对照组相比,p-AKT(Ser473)表达水平升高并可显著逆转由于敲降DNAJB6b表达导致的细胞穿膜数目降低(P<0.01)。结论: DNAJB6b在结直肠癌组织中表达上调,其过表达可通过激活AKT通路增强结直肠癌细胞的侵袭迁移能力,提示其异常表达在结直肠癌发生进展过程中发挥促癌作用。     

miR-145-5p靶向TAGLN2调控结直肠癌SW620细胞侵袭和迁移的机制探讨

目的:探究微小RNA-145-5p（miR-145-5p）在结直肠癌组织和细胞中的表达情况及其靶向调控肌动蛋白凝胶蛋白2（TAGLN2）对结直肠癌细胞侵袭和迁移能力的影响。方法:采用实时荧光定量PCR（qPCR）技术对48例结直肠癌患者癌组织、配对癌旁组织、结直肠癌细胞株（HCT8、SW620、HCT116、HT-29）及结直肠黏膜细胞FHC中的miR-145-5p和TAGLN2 mRNA表达进行定量分析。将SW620细胞设为空白对照组、miR-145-5p mimics组、mimics-NC组、pcDNA3.1-TAGLN2组、pcDNA3.1-Vector组和miR-145-5p mimics+pcDNA3.1-TAGLN2组,采用qPCR检测miR-145-5p和TAGLN2 mRNA表达,采用Transwell法检测细胞侵袭及迁移能力,采用免疫印迹法（Western blot）检测TAGLN2蛋白及EMT相关蛋白表达,采用双荧光素酶报告实验检测miR-145-5p和TAGLN2间的靶向关系。结果:miR-145-5p在结直肠癌组织中的表达水平显著低于癌旁组织（P<0.05）,并与结直肠癌患者的TNM分期和淋巴结转移相关（均P<0.05）;TAGLN2在结直肠癌组织中的表达水平显著高于癌旁组织,并与miR-145-5p表达呈负相关（P<0.05）;miR-145-5p和TAGLN2在结直肠癌HCT8、SW620、HCT116和HT-29细胞中的表达水平显著低于或高于FHC细胞（均P<0.05）。miR-145-5p过表达可降低SW620细胞的侵袭和迁移能力。miR-145-5p靶向调控TAGLN2表达,单独转染TAGLN2阳性质粒可增加SW620细胞的侵袭和迁移能力,与miR-145-5p mimics同时转染后,TAGLN2蛋白、波形蛋白（Vimentin）和神经钙黏素（N-cadherin）表达降低,上皮钙黏素（E-cadherin）表达升高,TAGLN2对SW620细胞侵袭和迁移能力的增强作用被显著抑制。结论:miR-145-5p在结直肠癌中呈低表达状态,其表达水平与结直肠癌患者的TNM分期和淋巴结转移密切相关,miR-145-5p靶向调控TAGLN2抑制结直肠癌细胞的侵袭和迁移能力。     

LINC00909靶向miR-365a-5p/FGFBP1分子轴调控结肠癌细胞增殖、迁移及侵袭的实验研究

目的 探讨LINC00909对结肠癌细胞增殖、迁移、侵袭的影响及可能机制.方法 购买正常结肠上皮细胞NCM460,结肠癌细胞HCT8、Caco-2及DLD-1;用实时荧光定量PCR(RT-qPCR)及蛋白质印迹法(Western blotting)检测NCM460细胞及结肠癌细胞中LINC00909、miR-365a-...     

miR-637抑制结肠癌HCT116细胞生长和迁移的机制研究

目的:分析miR-637对结肠癌HCT116细胞生长和迁移的影响。方法:分别构建miR-637过表达或者低表达的结肠癌HCT116细胞系。通过MTT方法检测miR-637对细胞增殖的作用,PI（propidium iodide）染色检测miR-637对细胞周期的影响,Annexin V-FITC/PI染色检测miR-637对细胞凋亡的作用。Western blot检测miR-637对细胞中CDK4和Bcl-2的影响。Transwell实验检测miR-637对细胞迁移的作用,进一步通过Western blot检测miR-637对细胞中MMP2的影响。结果:miR-637抑制HCT116细胞的增殖,抑制G1/S期进程,促进细胞凋亡,Western blot结果显示,miR-637抑制CDK4和Bcl-2在HCT116细胞中的表达。Transwell实验指出,miR-637抑制细胞的迁移,Western blot结果指出miR-637抑制MMP2在HCT116细胞中的表达。结论:miR-637可以通过抑制CDK4、Bcl-2和MMP2的表达抑制HCT116细胞的生长和迁移。     

miR-106b-5p靶向调控细胞周期蛋白D1抑制结直肠癌细胞增殖、迁移与侵袭

目的:探讨miR-106b-5p对结直肠癌(colorectal cancer,CRC)细胞增殖、迁移与侵袭的影响以及其作用机制.方法:实时荧光定量PCR检测miR-106b-5p在CRC组织与相应的癌旁组织、永生化的肠上皮细胞以及肠癌细胞中的表达量;CCK8实验检测DLD1细胞增殖能力;细胞划痕实验检测DLD1细胞的...     

肠癌组织中miR-141的表达及其对HCT116细胞增殖和迁移的影响

目的:探讨miR-141在肠癌组织中的表达情况以及其对HCT116细胞生物学功能的影响及其作用机制。方法:选取2016年05月至2018年05月在中国医科大学附属第一人民医院手术切除的30对肠癌组织以及癌旁组织进行miRNA芯片筛查。逆转录定量聚合酶链反应分析其中异常表达miRNA情况,评估miR-141的表达与肿瘤相关信息的相关性。通过TargetScan软件分析miR-141可能靶向的蛋白,在HCT116细胞中通过荧光素酶报告基因实验检测miR-141对DEK蛋白的靶向作用。HCT116细胞中分别过度表达和沉默表达miR-141后,通过MTT实验检测细胞增殖情况,Transwell实验检测细胞的迁移情况。结果:芯片分析和逆转录定量聚合酶链反应指出miR-141在肠癌组织中表达低于癌旁组织,miR-141与肿瘤的进程具有相关性,TargetScan软件指出miR-141可以靶向作用于DEK,荧光素酶报告基因实验印证了miR-141对DEK的靶向作用。MTT实验指出miR-141过度表达显著抑制细胞增殖,miR-141沉默表达显著促进细胞增殖,与对照组相比,差异有统计学意义（P＜0.05）。Transwell实验显示,miR-141过度表达可以抑制HCT116细胞的迁移,miR-141沉默表达后HCT116细胞的迁移得到促进。结论:miR-141通过靶向DEK蛋白能够抑制HCT116细胞的增殖和迁移。     

miRNA-34 a对人结肠癌细胞 HCT116增殖及侵袭转移的影响

目的：研究微小RNA-34a（microRNA-34a,miR-34a）在人结肠癌细胞株HCT116中的过表达对细胞增殖和侵袭的影响及其机制。方法设计合成并构建携带绿色荧光蛋白（ GFP）的miR-34a真核表达载体,脂质体法稳定转染HCT116细胞。通过Realtime PCR验证转染后miR-34a的表达变化。 MTT法检测转染前后HCT116细胞增殖能力变化, Transwell法检测转染前后HCT116细胞侵袭能力改变,western blot检测目的蛋白的表达。结果 miR-34a转染HCT116细胞后其表达量增加到（7．32±1．34）倍,而HCT116细胞增殖能力也受到显著抑制,下降到（0．49±0．10）;Bcl-2蛋白受到miR-34a表达的抑制,而BAX的表达则受到miR-34a表达的增强;HCT116细胞侵袭能力在miR-34a过表达后显著增强,相应的MMP-2和MMP-9表达也出现显著增强。阴性对照组与空白对照组比较无显著性差异。结论 miR-34a的过表达能够抑制人结肠癌细胞HCT116的增殖及侵袭转移,与调控Bcl-2／BAX和MMP-2和-9蛋白的表达密切相关。     

miR-3200-3p通过靶向抑制RNF111促进结直肠癌细胞恶性进展的机制研究

目的:探讨miR-3200-3p能否通过靶向抑制RNF111促进结直肠癌细胞恶性进展。方法:选择5株人结直肠癌细胞系,Real-time PCR检测miR-3200-3p、RNF111的表达,Western blot检测RNF111蛋白的表达;利用双荧光素酶实验验证miR-3200-3p与RNF111的靶向抑制;利用miR-3200-3p mimic/inhibitor或利用miR-3200-3p inhibitor与RNF111 siRNA共转染HCT116细胞,Real-time PCR检测miR-3200-3p表达,Western blot检测RNF111、p-SMAD2蛋白表达,MTT检测细胞增殖,划痕实验检测细胞迁移,Transwell检测细胞侵袭,流式细胞术检测细胞凋亡情况。结果:五株人结直肠癌细胞中,HCT116细胞中miR-3200-3p相对高表达,RNF111相对低表达;miR-3200-3p mimic或inhibitor转染后,与各自NC组相比,可显著促进或抑制RNF111蛋白的表达,促进或抑制细胞的增殖、侵袭及迁移,抑制或促进细胞凋亡（均P＜0.05）;与pmirGLO-MUT 3' UTR+mimics转染组相比,pmirGLO-WT 3' UTR+mimics转染组荧光素酶活性显著降低（P＜0.05）;与miR-3200-3p NC组相比,miR-3200-3p inhibitor及miR-3200-3p inhibitor+siRNA NC组RNF111蛋白表达显著升高,p-SMAD2蛋白表达显著降低,细胞增殖、迁移及侵袭被显著抑制,细胞凋亡被显著促进（均P＜0.05）,与miR-3200-3p inhibitor+siRNA NC组相比,miR-3200-3p inhibitor+RNF111 siRNA组细胞RNF111、p-SMAD2蛋白表达、增殖、迁移、侵袭及凋亡被显著逆转（均P＜0.05）。结论:miR-3200-3p可通过靶向抑制RNF111促进结直肠癌细胞增殖、侵袭及迁移,抑制细胞凋亡。     

miR-194靶向EZH2抑制甲状腺癌细胞增殖、迁移和侵袭

目的:研究miR-194、EZH2对甲状腺癌细胞增殖、迁移和侵袭的影响,并探讨其作用机制。方法:采用qRT-PCR法检测甲状腺癌组织、癌旁正常组织及甲状腺癌细胞和正常甲状腺上皮细胞中miR-194和EZH2的mRNA表达;将miR-194（转染miR-194 mimics）、miR-NC（未转染细胞）、inhibitor-NC（转染空inhibitor）、miR-194 inhibitor（转染miR-194 inhibitor）、si-EZH2（转染si-EZH2）、miR-194+Vector（miR-194 mimics和pcDNA 3.1共转染）、miR-194+EZH2（miR-194 mimics和pcDNA 3.1-EZH2共转染）均以脂质体法转染到SW579、IHH-4细胞;Western blot检测细胞中EZH2的蛋白表达;MTT法检测细胞的增殖;Transwell检测细胞的迁移和侵袭;双荧光素酶报告基因检测实验检测细胞荧光素酶活性。结果:与正常组相比,甲状腺癌组EZH2的表达显著升高,miR-194的表达显著降低;与人正常甲状腺上皮细胞相比,甲状腺癌细胞中EZH2表达显著升高,miR-194的表达显著降低,且过表达miR-194和沉默EZH2均可抑制甲状腺癌细胞增殖、迁移和侵袭。EZH2为miR-194的靶标,且EZH2可逆转过表达miR-194对甲状腺癌细胞增殖、迁移和侵袭的抑制作用。结论:miR-194可抑制甲状腺癌细胞的增殖、迁移和侵袭,可能与靶向EZH2有关,将可为miR-194靶向治疗甲状腺癌提供依据。     

miR-141靶向YAP1抑制肝癌细胞HCC-LM3增殖、迁移和侵袭

目的:探究microRNA-141（miR-141）对肝癌细胞HCC-LM3增殖、迁移、侵袭的影响。方法:通过荧光定量PCR（qPCR）检测肝癌细胞系（HepG2、Huh7、HCC-LM3）与肝上皮细胞THLE-3中miR-141的表达量；免疫印迹试验（Western blot）分析Yes相关蛋白1（YAP1）的表达量。采用噻唑蓝（MTT）实验分析过表达miR-141或沉默YAP1对HCC-LM3细胞增殖的影响，Transwell实验检测细胞的侵袭、迁移能力。采用生物信息学预测和双荧光素酶报告基因实验验证miR-141的靶基因。功能性实验检测过表达YAP1对miR-141调控的HCC-LM3细胞增殖、迁移、侵袭作用的影响。结果:qPCR和Western blot的结果表明，肝癌细胞系（HepG2、Huh7、HCC-LM3）中miR-141的表达量下调，YAP1的表达量上调；过表达miR-141和沉默YAP1可以抑制HCC-LM3细胞增殖、侵袭、迁移；生物信息学预测YAP1可能是miR-141的靶基因，双荧光素酶报告基因证实YAP1是miR-141的靶基因；过表达YAP1逆转miR-141对HCC-LM3细胞增殖、迁移、侵袭的抑制作用。结论:miR-141直接靶向YAP1抑制肝癌HCC-LM3细胞增殖、迁移、侵袭。     

LINC00511靶向miR-497-5p调控胃癌细胞增殖、迁移和侵袭及机制研究

目的:探讨LINC00511对胃癌细胞增殖、迁移和侵袭的影响及其作用机制。方法:将pcDNA、pcDNA-LINC00511、si-NC、si-LINC00511、miR-NC、miR-497-5p分别转染至MGC-803细胞中,分别记为pcDNA组、pcDNA-LINC00511组、si-NC组、si-LINC00511组、miR-NC组、miR-497-5p组;将si-LINC00511质粒分别与anti-miR-NC、anti-miR-497-5p共转染至MGC-803细胞中,分别记为si-LINC00511+anti-miR-NC组、si-LINC00511+anti-miR-497-5p组。实时荧光定量PCR（RT-qPCR）检测miR-497-5p和LINC00511表达水平;蛋白质印迹（Western Blot）法检测细胞周期素D1（cyclin D1,CyclinD1）、p21、基质金属蛋白酶2（matrix metalloproteinase 2,MMP2）、基质金属蛋白酶9（matrix metalloproteinase 9,MMP9）蛋白表达水平;四甲基偶氮唑盐比色法(MTT)检测细胞活性;Transwell检测细胞迁移和侵袭;双荧光素酶报告基因实验检测LINC00511和miR-497-5p的靶向关系。结果:与正常胃黏膜上皮细胞GES-1相比,胃癌细胞MGC-803、MKN-45、AGS中miR-497-5p表达水平显著降低,LINC00511表达水平显著升高。LINC00511靶向调控miR-497-5p的表达。抑制LINC00511表达和miR-497-5p过表达可降低细胞活性和迁移、侵袭数量,降低CyclinD1、MMP2、MMP9蛋白表达水平,提高p21蛋白表达水平。干扰miR-497-5p表达逆转了抑制LINC00511表达对胃癌MGC-803细胞增殖、迁移和侵袭的抑制作用。结论:抑制LINC00511表达可抑制胃癌细胞增殖、迁移和侵袭,其机制可能与miR-497-5p表达有关,将为胃癌的治疗提供新思路和新靶点。     

RasGRF2 promotes migration and invasion of colorectal cancer cells by modulating expression of MMP9 through Src/Akt/NF-κB pathway

Ras-specific guanine nucleotide-releasing factor 2 (RasGRF2) is a member of the guanine nucleotide exchange factors family which is expressed in a variety of tissues and cancer. However, the role of RasGRF2 in cancer is less reported, especially in colorectal cancer(CRC). Hence, the present study aimed to investigated the function of RasGRF2 and ways in which it affects tumor progression in CRC samples and cell lines. We first measured RasGRF2 mRNA level in 26 paired tumor and nontumor colon tissues after colon cancer surgical resection, and determined RasGRF2 protein level in 97 paired paraffin-embedded colon cancer tissues, and found that levels of RasGRF2 mRNA and protein were increased in colorectal tumor tissues, compared with adjacent non-tumor tissues. We then examined the effects of RasGRF2 knockdown on proliferation, migration and invasion were analyzed in CRC cells (SW480, HCT116 and LS174T). HCT116 cells with RasGRF2 knockdown were injected into the tail vein in nude mice to yield metastatic model, and tumor metastasis was measured as well. We found that knockdown of RasGRF2 in CRC cells reduced their migration and invasion in vitro and metastasis in mice. Furthermore, we explored the underlying molecular mechanism for RasGRF2-mediated CRC migration and invasion. The results showed that knockdown of RasGRF2 in CRC cells impairing the expression of MMP9 and inhibiting the activation of Src/Akt and NF-κB signaling. We conclude that RasGRF2 plays a role in controlling migration and invasion of CRC and modulates the expression of MMP9 through Src/PI 3-kinase and the NF-κB pathways.     

Saponin from Platycodi radix inactivates PI3K/AKT signaling pathway to hinder colorectal cancer cell proliferation,invasion, and migration through miR-181c/d-5p/RBM47

Colorectal cancer (CRC) is the third frequent cancer and second leading reason of cancer-related mortality all over the globe. Saponins from Platycodi radix (SPR) and microRNAs (miRNAs) have been reported to regulate CRC cell progression. Real-time quantitative polymerase chain reaction (RT-qPCR) detected miR-181c-5p, miR-181d-5p, and RBM47 expression level. Cell counting kit-8 (CCK-8), 5-ethynyl-20-deoxyuridine (EdU), colony formation, transwell, and wound healing assays validated that miR-181c-5p and miR-181d-5p promote CRC cell proliferation, migration and invasion and SPR exerts opposite effects. Cignal Finder Reporter Array and western blot proved that the activity of PI3K/AKT pathway was decreased by RBM47 overexpression. RNA pulldown, luciferase reporter, and RNA-binding protein immunoprecipitation (RIP) assays proved the interaction between miR-181c/d-5p and RBM47, and RBM47 and PTEN. Rescue experiments were carried out to validate that RBM47 reverses the influence of miR-181c/d-5p on the progression of CRC cells. The stability of PTEN was probed by real-time quantitative polymerase chain reaction in CRC cells treated with Actinomycin D (Act D). To be concluded, SPR inactivates PI3K/AKT signaling pathway to suppress CRC cell proliferation, invasion, and migration via miR-181c/d-5p/RBM47. Elucidating the mechanisms of SPR underlying CRC may offer novel insight into CRC treatment.     

miR-409-3p靶向调控RRM2抑制鼻咽癌细胞增殖、迁移及侵袭

目的:探究微小RNA-409-3p(miR-409-3p)对鼻咽癌细胞增殖、迁移及侵袭的影响及其作用机制。方法:采用实时荧光定量聚合酶链反应(qRT-PCR)与蛋白免疫印迹法(Western blot)分别检测人永生化鼻咽上皮细胞(NP69)、鼻咽癌细胞5-8F、6-10B中miR-409-3p、核糖核苷酸还原酶M2(RRM2)的表达差异;细胞计数试剂盒(CCK-8)检测miR-409-3p过表达或RRM2过表达对6-10B细胞增殖的影响;Transwell小室实验检测miR-409-3p过表达或RRM2过表达对6-10B细胞迁移及侵袭的影响。双荧光素酶报告实验与Western blot测定miR-409-3p与RRM2在6-10B细胞中的调控关系;Western blot检测c-Myc、细胞周期蛋白1(CyclinD1)、基质金属蛋白酶-2(MMP-2)、基质金属蛋白酶-9(MMP-9)蛋白表达量。结果:与NP69细胞相比,5-8F、6-10B细胞中miR-409-3p的表达水平显著降低(P<0.05),RRM2的表达水平显著升高(P<0.05);miR-409-3p过表达后细胞存活率显著降低(P<0.05),迁移细胞数与侵袭细胞数显著减少(P<0.05),c-Myc、CyclinD1、MMP-2、MMP-9蛋白表达水平显著降低(P<0.05);双荧光素酶报告实验证实miR-409-3p能够靶向结合RRM2,增强miR-409-3p的表达后6-10B细胞中RRM2的表达下调(P<0.05);RRM2过表达能够明显减弱miR-409-3p过表达对6-10B细胞增殖、迁移及侵袭能力的抑制作用(P<0.05)。结论:miR-409-3p可能通过负向调控RRM2的表达从而抑制鼻咽癌细胞增殖、迁移及侵袭能力。     

MicroRNA-106b promotes colorectal cancer cell migration and invasion by directly targeting DLC1

Background

Growing evidence suggests that microRNAs (miRNAs) play an important role in tumor development, progression and metastasis. Aberrant miR-106b expression has been reported in several cancers. However, the role and underlying mechanism of miR-106 in colorectal cancer (CRC) have not been addressed.

Methods

Quantitative RT-PCR(qRT-PCR) was performed to evaluate miR-106b levels in CRC cell lines and patient specimens. Cell proliferation was detected using MTT assay, and cell migration and invasion ability were evaluated by wound healing assay and transwell assay. The target gene of miR-106b was determined by qRT-PCR, western blot and luciferase assays.

Results

miR-106b was significantly up-regulated in metastatic CRC tissues and cell lines, and high miR-106b expression was associated with lymph node metastasis and advanced clinical stage. In addition, miR-106b overexpression enhances, whereas miR-106b depletion reduces CRC cell migration and invasion. Moreover, we identify DLC1 as a direct target of miR-106b, reveal its expression to be inversely correlated with miR-106b in CRC samples and show that its re-introduction reverses miR-106b-induced CRC cell migration and invasion. Furthermore, survival analyses showed the patients with high mi-106b/low DLC1 had shorter overall survival (OS) and disease-free survival (DFS) rates, and confirmed miR-106b may be an independent prognostic factor for OS and DFS in CRC patients.

Conclusions

Our findings indicate that miR-106b promotes CRC cell migration and invasion by targeting DLC1. This miRNA may serve as a potential prognostic biomarker and therapeutic target for CRC.     

Expression of microRNA-1299 in esophageal carcinoma and its effects on migration and invasion of esophageal cancer cells北大核心CSCD

Objective: To investigate the expression of microRNA-12 99 (miR-1299) in esophageal carcinoma and its effects on the migration and invasion of esophageal cancer TE1 cells. Methods: The pathological tissue specimens and their matched paracancerous tissues of 58 patients with esophageal cancer were selected in the Fourth Hospital of Hebei Medical University from June 2017 to June 2018. The expression level of miR-1299 in cancer and corresponding adjacent tissues was detected by real-time fluorescent quantitative PCR. The relationship between miR-1299 expression and clinicopathological features was analyzed. After miR-1299-mimics were transfected into esophageal cancer TE1 cells for the overexpression of miR-1299, the proliferation of TE1 cells was detected by CCK-8 assay, and the migration and invasion abilities were detected by Transwell migration and invasion assays, respectively. Then the expressions of matrix metalloproteinase 11 (MMP11) and MMP16 mRNAs and proteins in miR-1299 over-expressed TE1 cells were detected by realtime fluorescent quantitative PCR and Western blotting, respectively. Results: The expression of miR-1299 in esophageal cancer tissues was significantly lower than that in the adjacent tissues (P< 0.001). The expression level of miR-1299 was associated with the clinical stage of esophageal cancer patients (P < 0.05). After the transfection of miR-1299-mimics into TE1 cells, the expression level of miR-1299 was significantly increased (P< 0.01). After the over-expression of miR-1299 in TE1 cells, the proliferation of TE1 cells did not change significantly (P > 0.05), while the migration (P < 0.001) and invasion (P < 0.01) abilities decreased significantly, and the expressions of MMP11 and MMP16 mRNAs and proteins were obviously decreased (all P< 0.01). Conclusion: The expression of miR-1299 is down-regulated in esophageal cancer tissues and may inhibit the migration and invasion of esophageal cancer cells. © 2019 by TUMOR. All rights reserved.     

LINC00243靶向miR-1976促进甲状腺癌细胞增殖、迁移和侵袭

目的:探讨长链非编码RNA（lncRNA）LINC00243对甲状腺癌细胞增殖、迁移及侵袭的影响和分子机制。方法:实时荧光定量PCR（qRT-PCR）检测正常甲状腺细胞系（HT-ori3）和甲状腺癌细胞系（BCPAP、TPC-1和SW1736）中LINC00243和miR-1976的表达水平。将LINC00243小干扰RNA（si-LINC00243）、miR-1976模拟物（miR-1976 mimics）分别转染TPC-1细胞。细胞计数试剂盒（CCK-8）检测细胞活力;Transwell实验检测细胞迁移和侵袭数量;蛋白质印记（Western blot）检测细胞周期素D1（CyclinD1）、基质金属蛋白酶2（MMP2）和MMP9的表达水平。双荧光素酶报告基因实验和qRT-PCR验证LINC00243和miR-1976的靶向调控关系。结果:与HT-ori3细胞比较,3种甲状腺癌细胞中LINC00243的表达水平显著升高,miR-1976的表达水平显著降低。沉默LINC00243或高表达miR-1976均可抑制TPC-1细胞的增殖、迁移和侵袭,抑制CyclinD1、MMP2和MMP9蛋白的表达（P＜0.05）。LINC00243靶向负性调控miR-1976表达。低表达miR-1976可逆转沉默LINC00243对TPC-1细胞增殖、迁移和侵袭的抑制作用（P＜0.05）。结论:在甲状腺癌细胞中,LINC00243呈高表达,miR-1976呈低表达。LINC00243通过靶向调控miR-1976促进甲状腺癌细胞增殖、迁移和侵袭。