外泌体miR-181b-5p诱导M2型巨噬细胞极化促进喉癌细胞转移的功能研究北大核心CSCD

目的:探究外泌体miR-181b-5p对巨噬细胞极化和喉癌转移的影响。方法:THP-1诱导分化为M0型的巨噬细胞,M0型巨噬细胞分为TU-212 exo、TU-177 exo、Hep-2 exo、NP69 exo、miR-NC exo、miR-181b-5p exo组和PBS组。外泌体诱导后的巨噬细胞与TU-212细胞共孵育,qRT-PCR检测miR-181b-5p、TNF-α、CCR7、Arg1、CD206、CD163表达,Western blot检测PI3K p110γ、PTEN、p-AKT、AKT表达,Transwell小室法检测各组细胞迁移和侵袭能力,双荧光素酶报告基因实验验证miR-181b-5p与PTEN的靶向关系。结果:TU-212、TU-177、Hep-2细胞及其外泌体中miR-181b-5p高表达,TU-212 exo、TU-177 exo、Hep-2exo、miR-181b-5p exo促进巨噬细胞中miR-181b-5p、Arg1、CD206、CD163、PI3K p110γ表达及AKT磷酸化,抑制PTEN、TNF-α、CCR7表达。PTEN为miR-181b-5p的靶基因。TU-212 exo、TU-177 exo、Hep-2 exo、miR-181b-5p exo诱导的巨噬细胞显著促进TU-212细胞的迁移和侵袭。结论:外泌体miR-181b-5p激活PTEN/PI3Kγ信号通路诱导M2型巨噬细胞极化,从而促进喉癌细胞的转移。     

上调miR-34b-5p通过抑制胰岛素样生长因子1受体干扰肾癌Caki-1细胞的增殖和侵袭

目的观察微小RNA-34b-5p(miR-34b-5p)对人肾癌细胞增殖和侵袭的影响及分子机制。方法采用实时荧光定量PCR(real-time quantitative PCR, qRT-PCR)检测人肾癌细胞ACHN、Caki-1、OS-RC-2、786-O、A498和人正常肾小管上皮细胞HK-2中miR-34b-5p的表达量。以miR-34b-5p表达量最低的Caki-1细胞为转染对象,应用脂质体转染miR-34b-5p或微小RNA(miR-NC)。采用qRT-PCR检测各组细胞中miR-34b-5p的表达水平。MTT法和Transwell侵袭实验检测肾癌细胞的增殖和侵袭能力。生物信息学预测并采用双荧光素酶报告基因验证miR-34b-5p的潜在靶基因。qRT-PCR和Western blot法分别检测miR-34b-5p潜在靶基因及下游通路蛋白的表达。结果肾癌细胞中miR-34b-5p的表达量低于正常肾小管上皮细胞。用脂质体转染miR-34b-5p后Caki-1细胞中miR-34b-5p的表达量明显高于miR-NC组,提示过表达成功。上调miR-34b-5p可抑制肾癌细胞的增殖能力和侵袭能力。生物信息学预测和双荧光素酶报告基因证实胰岛素样生长因子1受体(insulin like growth factor 1 receptor, IGF1R)为miR-34b-5p的靶基因。上调miR-34b-5p可降低肾癌Caki-1细胞中IGF1R基因及PI3K/Akt信号通路蛋白的表达量。结论上调miR-34b-5p可抑制人肾癌Caki-1细胞的增殖和侵袭,其可能的分子机制为降低IGF1R基因及下游PI3K/Akt信号通路蛋白的表达。     

LncRNA NEAT1对垂体瘤细胞系GH3侵袭和迁移的作用机制研究

目的 探讨lncRNA NEAT1对垂体瘤细胞侵袭、迁移的作用及机制。方法 qRT-PCR检测lncRNA NEAT1、miR-134和ITGB1表达；Transwell检测侵袭和迁移；双荧光素酶报告基因实验检测miR-134与lncRNA NEAT1、ITGB1的调控关系；Western blot检测ITGB1/FAK/PI3K通路相关蛋白表达。结果 敲低lncRNA NEAT1抑制GH3细胞侵袭和迁移（P<0.05）；抑制miR-134可逆转下调lncRNA NEAT1对GH3细胞侵袭、迁移的抑制作用（P<0.05）。miR-134与lncRNA NEAT1和ITGB1存在负靶向调控关系（P<0.05）。上调miR-134抑制GH3细胞侵袭和迁移，抑制ITGB1/FAK/PI3K通路激活（P<0.05）;ITGB1过表达削弱上调miR-134对GH3细胞的影响（P<0.05）。结论 下调lncRNA NEAT1靶向miR-134可能通过抑制ITGB1/FAK/PI3K通路激活抑制垂体瘤细胞侵袭、迁移。     

MiR-215-5p经AKT/GSK-3β/Snail信号通路抑制乳头状甲状腺癌增殖、迁移和侵袭

目的探究miR-215-5p对乳头状甲状腺癌增殖、迁移和侵袭能力的影响以及机制。方法乳头状甲状腺癌TPC1细胞体外转染miR-215-5p mimic后利用MTT实验、细胞划痕实验、细胞侵袭实验检测TPC1细胞增殖、迁移、侵袭能力的变化;预测并验证miR-215-5p的靶基因,并且在TPC1细胞过表达和低表达miR-215-5p的靶基因后,检测TPC1细胞增殖、迁移、侵袭能力的变化;利用Western blot检测转染后靶基因的表达水平,AKT和GSK-3β的磷酸化水平,以及Snail的表达水平。结果 miR-215-5p mimic能够显著抑制TPC1细胞增殖、迁移、侵袭能力(P0.05);通过双荧光素酶报告实验验证了miR-215-5p的靶基因为ARFGEF1;低表达ARFGEF1的TPC1细胞增殖、迁移、侵袭能力被显著抑制(P0.05);miR-215-5p mimic可显著抑制过表达ARFGEF1引起的TPC1细胞增殖、迁移、侵袭能力的增加(P0.05);Western blot结果显示miR-215-5p mimic可引起ARFGEF1和Snail表达水平显著降低(P0.05),AKT和GSK-3β的磷酸化水平降低(P0.05),但是miR-215-5p inhibitor和过表达ARFGEF1均可恢复ARFGEF1和Snail表达水平以及AKT和GSK-3β的磷酸化水平。结论 MiR-215-5p通过AKT/GSK-3β/Snail信号通路以ARFGEF1为目标发出信号抑制乳头状甲状腺癌增殖、迁移和侵袭。     

白花蛇舌草上调miR-485-5p抑制人膀胱癌细胞系KU-19-19增殖、迁移和侵袭

目的探讨白花蛇舌草对膀胱癌细胞系KU-19-19增殖、迁移和侵袭的影响和可能的分子机制。方法将KU-19-19细胞分为对照组、白花蛇舌草组、miR-NC组、miR-485-5p组、anti-miR-NC组、anti-miR-485-5p组、白花蛇舌草+anti-miR-NC组、白花蛇舌草+anti-miR-485-5p组、白花蛇舌草+anti-miR-485-5p+LY294002组。细胞计数试剂盒(CCK-8)、Transwell实验、实时荧光定量PCR(RT-qPCR)分别检测细胞增殖、迁移侵袭以及miR-485-5p的表达。蛋白质印迹(Western blot)检测磷脂酰肌醇-3-羟激酶(PI3K)和蛋白激酶B(AKT)的磷酸化水平。结果白花蛇舌草干预后KU-19-19细胞增殖率、迁移侵袭细胞数显著降低,miR-485-5p表达显著升高(P0.05);过表达miR-485-5p后,KU-19-19细胞增殖率、迁移侵袭细胞数显著降低(P0.05);抑制miR-485-5p表达后,KU-19-19细胞增殖率、迁移侵袭细胞数显著升高(P0.05)。抑制miR-485-5p可以逆转降低白花蛇舌草对KU-19-19细胞增殖、迁移和侵袭的抑制作用(P0.05);LY294002可以逆转降低抑制miR-485-5p对白花蛇舌草处理的KU-19-19细胞增殖、迁移和侵袭的促进作用(P0.05)。结论白花蛇舌草通过上调miR-485-5p可抑制膀胱癌细胞的增殖、迁移和侵袭,其机制可能与抑制PI3K/AKT信号通路有关。     

IL-8通过激活PI3K/AKT通路促进结肠癌细胞增殖、迁移和侵袭

为研究IL-8对结肠癌细胞增殖、迁移和侵袭的影响并探讨其作用机制,应用免疫组织化学法检测结肠癌组织和正常癌旁组织中IL-8的表达;MTT法检测不同浓度IL-8处理或抑制PI3K/AKT信号通路后结肠癌细胞SW480的增殖情况;Western blotting检测IL-8处理后SW480细胞中p-AKT、t-AKT蛋白的表达;Transwell法检测抑制PI3K/AKT通路或IL-8处理后SW480细胞的迁移和侵袭能力。结果显示,与癌旁组织相比,结肠癌组织中IL-8的表达水平明显提高;IL-8处理后SW480细胞的增殖、迁移和侵袭能力明显增加,且PI3K/AKT通路异常激活;抑制PI3K/AKT通路可逆转IL-8对SW480细胞增殖、迁移和侵袭的促进作用。由此IL-8可促进结肠癌细胞增殖、迁移和侵袭,其机制可能与激活PI3K/AKT通路有关,可为IL-8在结肠癌中的治疗提供参考。     

miR-125b-5p靶向STAT3调控免疫因子IL-6/10的表达抑制子宫内膜癌细胞的增殖、迁移和侵袭的机制研究

目的探讨miR-125b-5p对子宫内膜癌细胞增殖、迁移和侵袭的影响及其机制。方法采用荧光定量PCR检测子宫内膜癌组织中miR-125b-5p的表达,免疫组织化学染色法检测子宫内膜癌组织中STAT3、IL-6/10的表达;双荧光素酶报告基因检测和Western blot检测验证miR-125b-5p和STAT3的靶向调控关系;荧光定量PCR和Western blot检测miR-125b-5p过表达或干扰STAT3表达对子宫内膜癌HEC-1B细胞中IL-6/10 mRNA和蛋白表达的影响;CCK-8法、Transwell小室分别检测miR-125b-5p过表达或干扰STAT3表达对HEC-1B细胞的增殖、迁移和侵袭的影响。结果与癌旁正常组织相比,子宫内膜癌组织中miR-125b-5p表达明显降低,而STAT3、IL-6/10蛋白的表达水平明显升高(P0.05)。子宫内膜癌中STAT3表达水平与肿瘤大小、淋巴结转移、组织学分级以及TNM分期呈显著正相关(P0.05),而miR-125b-5p表达与肿瘤大小、淋巴结转移、组织学分级以及TNM分期呈显著负相关(P0.05)。STAT3是miR-125b-5p的潜在靶基因,miR-125b-5p可负向调控STAT3表达。miR-125b-5p过表达后,HEC-1B细胞中IL-6/10 mRNA和蛋白表达水平以及细胞增殖、迁移、侵袭能力均明显降低;干扰STAT3表达后,HEC-1B细胞中IL-6/10表达及细胞增殖、迁移、侵袭能力与miR-125b-5p过表达的结果相一致。结论 miR-125b-5p可通过靶向STAT3调控IL-6/10的表达抑制子宫内膜癌细胞的增殖、迁移和侵袭。     

薯蓣皂苷对卵巢癌细胞体外转移活性及PI3K/AKT通路的影响

目的 探讨薯蓣皂苷对卵巢癌细胞生物学行为以及对PI3K/AKT通路的影响。方法 将卵巢癌细胞分为对照组、薯蓣皂苷组和PI3K/AKT通路抑制剂组，CCK-8实验检测细胞增殖能力；细胞划痕实验分析细胞迁移能力；Transwell实验分析细胞侵袭能力；流式细胞术分析细胞凋亡率；蛋白免疫印迹实验分析细胞PI3K/AKT通路蛋白的表达情况。结果 与对照组比较，薯蓣皂苷组和抑制剂组细胞的增殖能力、迁移和侵袭能力显著降低，凋亡率增加，p-PI3K和p-AKT蛋白表达水平降低。结论 薯蓣皂苷通过抑制PI3K/AKT信号通路抑制卵巢癌细胞的增殖、侵袭和迁移能力，并促进卵巢癌细胞凋亡。     

乳腺癌相关成纤维细胞miRNA表达的检测和分析

目的研究人乳腺癌微环境癌相关成纤维细胞(CAF)与正常成纤维细胞(NF)miRNA表达的差异及其对CAF的生物学功能的影响。方法运用1型胶原酶消化法分别处理临床乳腺癌患者的癌组织和对应癌旁组织标本,原代分离培养CAF和NF细胞;利用免疫荧光法和Western blot法分析CAF和NF细胞成纤维细胞分泌蛋白(FSP)的表达情况,对所分离培养的细胞进行纯度和特性鉴定;利用TranswellTM实验比较CAF与NF细胞的侵袭能力;利用miRNA芯片和芯片结果显著性差异(SAM)分析法分析CAF与NF细胞miRNA表达的差异;对差异miR-205和miR-221,在原代培养的CAF和NF进行实时定量PCR(qRT-PCR)验证;利用多种生物信息学软件预测差异miRNA的靶基因;利用DAVID软件对靶基因进行信号通路富集度分析。利用ELISA检测TGF-β和IL-6信号通路的核心蛋白基质金属蛋白酶1(MMP-1)、MMP-2和MMP-9的表达差异。结果成功分离得到原代培养的CAF与NF细胞,纯度大于95%;与NF细胞相比,CAF细胞的侵袭能力明显增强;miRNA芯片分析结果显示,CAF有10个变化倍数1.5的异常表达miRNA(P0.05),其中3个上调表达(miR-221-5p、miR-31-3p、miR-221-3p),7个下调表达(miR-205、miR-200b、miR-200c、miR-141、miR-101、miR-342-3p、let-7g)。信号通路富集度分析发现,miRNA靶基因与细胞分化、细胞黏附、细胞迁移、细胞增殖、细胞分泌和细胞间相互作用等密切相关,其中,异常表达的miR-200b/c和miR-141等miRNA通过抑制其靶基因,影响TGF-β信号通路、IL-6信号通路,进而影响CAF的侵袭和转移。结论人乳腺癌微环境CAF的miRNA表达谱发生显著变化,CAF细胞中异常表达miRNA可能参与了NF向CAF的转化,并与CAF细胞的增殖、黏附、侵袭、转移有密切关系。     

miR-296-5p 靶向 PLK1 调控 PI3K/ AKT 通路诱导骨肉瘤细胞中的自噬并抑制上皮-间质转化

目的 探讨 miR-296-5p 靶向 PLK1 对骨肉瘤 (osteosarcoma, OS) 细胞自噬及抑制上皮-间质转化 (EMT) 的作用机制。 方法 qRT-PCR 检测 miR-296-5p 在 OS 细胞中的表达。 采用生物信息学分析预测 miR-296-5p 的靶基因, 验证 miR-296-5p 对靶基因 PLK1 的直接靶向调控; 细胞转染构建 miR-296-5p 过表达 和干扰细胞, CCK-8、 克隆形成、 Transwell 小室、 流式、 蛋白免疫印迹实验检测 miR-296-5p 的不同表达对 U2OS 细胞中 PTBP1 表达水平及细胞增殖、 侵袭、 凋亡、 自噬及 EMT 的影响。 结果 与对照组比较, miR-296-5p 在 OS 中表达降低, 而 PLK1 则升高 (P< 0. 05); 与 miR-NC 组比较, mimic 组的克隆形成率、 侵袭 细胞数目及 PTBP1、 p62、 N-cadherin、 Vimentin、 p-PI3K/ PI3K、 p-AKT/ AKT 水平降低, 细胞凋亡率、 Beclin-1、 LC3-Ⅱ/ Ⅰ、 E-cadherin 水平升高 (P< 0. 05); 与 PLK1 组比较, PLK1 + mimic 组的克隆形成率、 侵袭 细胞数目及 PTBP1、 p62、 N-cadherin、 Vimentin、 p-PI3K/ PI3K、 p-AKT/ AKT 水平降低, 细胞凋亡率、 Beclin-1、 LC3-Ⅱ/ Ⅰ、 E-cadherin 水平升高 (P< 0. 05)。 结论 miR-296-5p 可能能够靶向 PLK1 调控 PI3K/ AKT 通路诱导 OS 细胞中的自噬并抑制 EMT。     

减体积肝移植模型大鼠肝脏组织miRNAs表达谱变化

BACKGROUND: Liver regeneration is the key factor influencing the prognosis of living donor liver transplantation. There has not been the research on special miRNA of liver regeneration after living donor liver transplantation. OBJECTIVE: To analyze the variation of miRNAs expression profile after rat reduced-size liver transplantation at certain time point, select and verify target miRNA which can provide targeting intervention strategies in liver regeneration after rat reduced-size liver transplantation and provide theoretical evidence for liver regeneration after living donor liver transplantation. METHODS: The reduced-size liver transplantation models were established. miRNAs microarray was used to detect miRNA expression. In differentially expressed microRNAs, real-time quantitative PCR was utilized to detect target miRNAs. The credibility of miRNAs microarray results was verified. RESULTS AND CONCLUSION: Compared with rat liver tissue in the sham operation group, 11 miRNAs up-regulated in reduced-size liver transplantation, including let-7b-5p, let-7c-5p, miR-101a-3p, miR-103-3p, miR-130a-3p, miR-142-5p, miR-186-5p, miR-199a-3p, miR-21-5p, 221-3p and miR-34a-5p. Four miRNAs were down-regulated, including miR-26b-5p, miR-150-5p, miR-19a-3p and rno-miR-146-5p. PCR test further verified that miR-221-3p and miR-199a-3p expression changes approximated the chip results at 24, 48 hours and 1 week, indicating that results of miRNA microarray were believable. These results verified that it exists variation of miRNAs expression profile after rat reduced-size liver transplantation, which picked out and verified the target miRNAs.        

miR-218 modulate hepatocellular carcinoma cell proliferation through PTEN/AKT/PI3K pathway and HoxA10

Purpose: To investigate the regulatory mechanism of miR-218 in human hepatocellular carcinoma (HCC). Methods: qPCR was used to compare the expression levels miR-218 among six hepatocellular carcinoma cell lines and normal liver tissues. After transfecting MHCC97L cells with either miR-218 mimics or miR-218 inhibitor, western blotting was used to examine the expressing patterns of cyclinD1, p21, and PTEN/AKT/PI3K signaling pathway-related proteins. MTT and colony forming assay was used to assess the capability of cell proliferation. Bioinformatic method was applied to predict the binding of miR-218 on HoxA10, and western blotting was used to examine the modulatory effect of miR-218 AND HoxA10 on PTEN/AKT/PI3K pathway in HCC. Results: The expression levels of miR-218 were frequently lower in HCC cell lines than in normal liver tissues. Over-expression of miR-218 in HCC cells significantly decreased cell proliferation whereas inhibiting miR-218 promoted cancer cell proliferation. Western blotting analysis demonstrated that tumorigenesis related protein cyclin D1 and p21, as well as PTEN/AKT/PI3K signaling pathways were actively modulated by miR-218 in HCC cells. The expression of endogenous HoxA10 was also down-regulated by miR-218 over-expression, and silencing HoxA10 directly activated PTEN in HCC cells. Conclusion: Modulation of miR-218 actively affected HCC cancer cell development. The regulatory mechanism of miR-218 in HCC cells was acting through PTEN/AKT/PI3K pathway and possibly associated with HoxA10.     

Suppressive effect of platycodin D on bladder cancer through microRNA-129-5p-mediated PABPC1/PI3K/AKT axis inactivation

Platycodin D (PD) is a major constituent of Platycodon grandiflorum and has multiple functions in disease control. This study focused on the function of PD in bladder cancer cell behaviors and the molecules involved. First, we administered PD to the bladder cancer cell lines T24 and 5637 and the human uroepithelial cell line SV-HUC-1. Cell viability and growth were evaluated using MTT, EdU, and colony formation assays, and cell apoptosis was determined using Hoechst 33342 staining and flow cytometry. The microRNAs (miRNAs) showing differential expression in cells before and after PD treatment were screened. Moreover, we altered the expression of miR-129-5p and PABPC1 to identify their functions in bladder cancer progression. We found that PD specifically inhibited the proliferation and promoted the apoptosis of bladder cancer cells; miR-129-5p was found to be partially responsible for the cancer-inhibiting properties of PD. PABPC1, a direct target of miR-129-5p, was abundantly expressed in T24 and 5637 cell lines and promoted cell proliferation and suppressed cell apoptosis. In addition, PABPC1 promoted the phosphorylation of PI3K and AKT in bladder cancer cells. Altogether, PD had a concentration-dependent suppressive effect on bladder cancer cell growth and was involved in the upregulation of miR-129-5p and the subsequent inhibition of PABPC1 and inactivation of PI3K/AKT signaling.     

Bone marrow fibroblasts overexpress miR-27b and miR-214 in step with multiple myeloma progression,dependent on tumour cell-derived exosomes

Aberrant microRNA (miR) expression has an important role in tumour progression, but its involvement in bone marrow fibroblasts of multiple myeloma patients remains undefined. We demonstrate that a specific miR profile in bone marrow fibroblasts parallels the transition from monoclonal gammopathy of undetermined significance (MGUS) to myeloma. Overexpression of miR-27b-3p and miR-214-3p triggers proliferation and apoptosis resistance in myeloma fibroblasts via the FBXW7 and PTEN/AKT/GSK3 pathways, respectively. Transient transfection of miR-27b-3p and miR-214-3p inhibitors demonstrates a cooperation between these two miRNAs in the expression of the anti-apoptotic factor MCL1, suggesting that miR-27b-3p and miR-214-3p negatively regulate myeloma fibroblast apoptosis. Furthermore, myeloma cells modulate miR-27b-3p and miR-214-3p expression in fibroblasts through the release of exosomes. Indeed, tumour cell-derived exosomes induce an overexpression of both miRNAs in MGUS fibroblasts not through a simple transfer mechanism but by de novo synthesis triggered by the transfer of exosomal WWC2 protein that regulates the Hippo pathway. Increased levels of miR-27b-3p and miR-214-3p in MGUS fibroblasts co-cultured with myeloma cell-derived exosomes enhance the expression of fibroblast activation markers αSMA and FAP. These data show that the MGUS-to-myeloma transition entails an aberrant miRNA profile in marrow fibroblasts and highlight a key role of myeloma cells in modifying the bone marrow microenvironment by reprogramming the marrow fibroblasts' behaviour. Copyright © 2018 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.     

MiR-188-5p and MiR-141-3p influence prognosis of bladder cancer and promote bladder cancer synergistically

MicroRNA (miRNA) plays a significant role in suppressing the occurrence and development of tumor by inhibiting the translation of target proteins. Although previous researches have verified many miRNAs’ functions in bladder cancer (BC), the function of miR-188-5p and miR-141-3p in BC still remains unknown. Our experiment manifested that miR-188-5p and miR-141-3p were highly expressed in BC tissues and cells, which indicated a poor prognosis. In vitro functional assays suggested that down-regulated miR-188-5p and miR-141-3p inhibited the proliferation, migration and invasion of BC cells, while a combination of half dose down-regulated miR-188-5p and half dose down-regulated miR-141-3p demonstrated a more obvious inhibition effect. All results indicated that miR-188-5p and miR-141-3p promoted BC respectively and synergistically. Therefore, miR-188-5p and miR-141-3p will not only assist the diagnosis of BC, but also serve as more effective joint markers to predict the progression of BC.     

MicroRNA-129-5p suppresses proliferation,migration and invasion of retinoblastoma cells through PI3K/AKT signaling pathway by targeting PAX6

BackgroundRetinoblastoma (RB) is the most common primary intraocular malignancy in children. Accumulating evidences have clarified that microRNAs (miRNAs) modulated signaling molecules by acting as oncogenes or tumor-suppressor genes in RB. Thus, in our study, we aimed to investigate the function of miR-129-5p in RB cells through PI3K/AKT signaling pathway by targeting PAX6. Two RB cell lines, Y79 and WERI-Rb-1, were selected in our study, followed by transfection of miR-129-5p inhibitor or si-PAX6 to explore the regulatory role of miR-129-5p in RB cell proliferation, invasion and migration.Material and methodsDual-luciferase assay was used for the detection of targeting relationship between miR-129-5p and PAX6. Besides, western blot analysis was applied to detect expression of cell cycle-related factors (CDK2 and Cyclin E) and PI3K/AKT signaling pathway-related factors (p-AKT and AKT). Nude mice tumorigenesis experiment was used to evaluate the effect of miR-129a-5p on RB growth in vivo.ResultsmiR-129-5p was down-regulated in RB cell lines. miR-129-5p directly targeted the 3′-untranslated region of PAX6. Artificial down-regulation of miR-129-5p promoted cell proliferation, migration and invasion in RB cell lines Y79 and WERI-Rb-1, and promoted RB growth in vivo via PI3K/AKT signaling pathway, which could be reversed by transfection with silencing PAX6.ConclusionThis study provides evidences that RB progression was suppressed by overexpressed miR-129-5p via direct targeting of PAX6 through PI3K/AKT signaling pathway, which may provide a molecular basis for better treatment for RB.     

miR-135b-3p调控XAF1表达影响甲状腺癌细胞的迁移、侵袭和放射增敏性

目的探讨miR-135b-3p对甲状腺癌细胞迁移、侵袭和放射敏感性的影响以及其可能的调控机制。方法培养正常甲状腺细胞Nthy-ori 3-1、甲状腺癌细胞K1和TPC-1,RT-qPCR检测细胞中miR-135b-3p表达,Western blot检测细胞中X染色体连锁凋亡抑制蛋白相关因子1(XAF1)表达。转染anti-miR-135b-3p至TPC-1细胞抑制miR-135b-3p表达,Transwell、Western blot及克隆形成实验分别检测抑制miR-135b-3p表达对TPC-1细胞迁移和侵袭、E-cadherin和MMP-2蛋白表达及对TPC-1细胞放射敏感性的影响。双荧光素酶报告基因实验验证miR-135b-3p与XAF1之间的靶向调控关系。结果与Nthy-ori 3-1细胞相比,K1和TPC-1细胞中miR-135b-3p表达水平显著升高(P<0.05),XAF1蛋白表达水平显著降低(P<0.05)。抑制miR-135b-3p表达可抑制TPC-1细胞的迁移和侵袭能力(P<0.05),促进TPC-1细胞E-cadherin蛋白表达(P<0.05),抑制MMP-2蛋白表达(P<0.05),增强TPC-1细胞的放射敏感性(P<0.05)。miR-135b-3p靶向负调控XAF1表达。抑制XAF1表达可降低抑制miR-135b-3p表达对TPC-1细胞迁移、侵袭及放射敏感性的影响。结论miR-135b-3p通过下调XAF1表达促进甲状腺癌细胞的迁移和侵袭能力,并降低其放射增敏性,是甲状腺癌的潜在治疗靶点。     

MicroRNA-301b-3p accelerates the growth of gastric cancer cells by targeting zinc finger and BTB domain containing 4

MicroRNAs (miRNAs) have been found to be aberrantly expressed and exert essential roles in the tumorigenesis and progression of gastric cancer (GC). miR-301b-3p has been recognized as a cancer-related miRNA in lung cancer, bladder cancer and hepatocellular carcinoma. However, the function of miR-301b-3p in GC progression and its underlying mechanism have not been studied yet. In this study, we found that miR-301b-3p expression was up-regulated in GC tissues compared to adjacent noncancerous tissues. Furthermore, the elevated levels of miR-301b-3p were detected in GC cell lines (SGC-7901, AGS, MKN-45 and MGC-803) as compared with GES-1 cells. Interestingly, GC tissues from patients with tumor size ≥ 5 cm and advanced tumor stages showed obvious higher levels of miR-301b-3p compared to matched controls. Functionally, miR-301b-3p knockdown prominently inhibited cell proliferation, and induced cell cycle arrest at G1 phase and apoptosis in MGC-803 cells. Meanwhile, ectopic expression of miR-301b-3p conversely regulated these biological behaviors of MKN-45 cells. Next, we found that miR-301b-3p knockdown increased, whereas miR-301b-3p overexpression reduced the expression of zinc finger and BTB domain containing 4 (ZBTB4) in GC cells. Accordingly, luciferase reporter assay identified ZBTB4 as a direct target of miR-301b-3p. ZBTB4 overexpression markedly restrained the growth of MGC-803 cells. More importantly, ZBTB4 silencing partially reversed miR-301b-3p knockdown-induced tumor suppressive effects on MGC-803 cells. In conclusion, we firstly revealed that miR-301-3p was highly expressed in GC and contributed to tumor progression via attenuating ZBTB4, which might provide a novel molecular-targeted strategy for GC treatment.     

lncRNA MALAT1靶向调控miR-146b-5p影响膀胱癌细胞侵袭和迁移

目的:探讨长链非编码RNA(lncRNA)肺腺癌转移相关转录因子1(MALAT1)靶向微小RNA-146b-5p(miR-146b-5p)影响膀胱癌细胞侵袭和迁移的机制。方法:在膀胱癌BIU-87细胞中转染MALAT1 siRNA,以real-time PCR方法测定转染效果,Transwell法测定侵袭及迁移能力,Western blot法检测细胞中上皮-间充质转化(EMT)相关蛋白波形蛋白(vimentin)、上皮型钙黏蛋白(E-cadherin)和迁移侵袭相关蛋白基质金属蛋白酶-2(MMP-2)蛋白表达的变化。生物信息学软件预测MALAT1与miR-146b-5p有靶向互补位点,利用双萤光素酶报告系统鉴定靶向关系。用real-time PCR方法检测下调MALAT1后BIU-87细胞中miR-146b-5p表达的变化。将MALAT1 siRNA和miR-146b-5p inhibitor共转染至BIU-87细胞中,用上述方法分析细胞侵袭、迁移及vimentin、E-cadherin和MMP-2蛋白表达的变化。结果:转染MALAT1 siRNA可明显下调BIU-87细胞中MALAT1的表达水平(P<0.05)。敲减MALAT1表达后,BIU-87细胞的侵袭和迁移能力下降,细胞中vimentin和MMP-2蛋白水平降低,E-cadherin蛋白水平升高。MALAT1靶向调控miR-146b-5p的表达,敲减MALAT1的表达可以提高BIU-87细胞中miR-146b-5p的水平。miR-146b-5p inhibitor可以明显逆转敲减MALAT1的表达对BIU-87细胞侵袭、迁移能力和vimentin、E-cadherin、MMP-2蛋白表达的影响。结论:下调MALAT1可靶向促进miR-146b-5p表达,抑制膀胱癌细胞侵袭、迁移能力和EMT。