LINC00649通过miR-424-5p/IGF1R轴调控内质网应激介导的宫颈癌细胞凋亡

目的探讨LINC00649/miR-424-5p/IGF1R对内质网应激(ERs)介导的宫颈癌(CC)细胞凋亡的影响。方法从GEO数据库中获取CC相关的数据,并分析差异表达的miRNAs。利用生物信息学数据库预测miR-424-5p的上、下游靶点,将LINC00649和IGF1R纳入研究,随后双荧光素酶实验进一步验证靶向关系。qRT-PCR检测LINC00649、miR-424-5p和IGF1R在CC组织和细胞中的表达水平。CCK-8和流式细胞术分别评估CC细胞增殖和凋亡变化。Western blot检测ERs相关蛋白GRP78、CHOP和Caspase-12的表达。结果与癌旁组织和H8细胞相比,LINC00649和IGF1R在CC组织和细胞中表达上调,而miR-424-5p下调(均P<0.05)。LINC00649的异常高表达与CC患者的预后不良有关,敲减LINC00649可通过促进ERs来抑制CC细胞活力,诱导细胞凋亡(均P<0.05)。LINC00649吸附miR-424-5p上调IGF1R的表达。miR-424-5p抑制剂或过表达IGF1R均可部分逆转敲减LINC00649对CC细胞的影响(均P<0.05)。结论 LINC00649能够通过miR-424-5p/IGF1R抑制CC细胞的ERs过程进而减少细胞凋亡,提高细胞活力。     

lncRNA-LINC00473在胃癌组织中的表达及临床意义

目的:分析LINC00473在胃癌中的表达情况、临床意义及对人胃癌细胞增殖水平的影响。方法:利用癌症基因组图谱(TCGA)数据库下载胃腺癌相关数据集，分析肿瘤组织与正常组织之间LINC00473的表达差异；利用 Kaplan-Meier 曲线进行患者生存分析；MTT方法检测胃癌细胞增殖水平、流式细胞术检测凋亡率的改变。结果:与癌旁组织比较，LINC00473在胃癌组织中的表达明显增加，差异具有统计学意义（P＜0.05）；生存分析发现，LINC00473表达与胃癌患者OS和DFS时间相关，LINC00473高表达的胃癌患者，OS和DFS时间明显缩短（P＜0.05）。转染LINC00473 siRNA至胃癌细胞后，结果发现与阴性质粒转染组比较:转染siRNA-LINC00473的胃癌细胞，LINC00473 表达明显降低；LINC00473表达下调后细胞增殖水平减慢，凋亡率增加。结论:LINC00473是一个新的胃癌生物标记物，可作为潜在的治疗新靶点。     

A novel lncRNA-LINC01116 regulates tumorigenesis of glioma by targeting VEGFA

Brain glioma is the most common malignant tumor of the central nervous system, and one of the leading causes of death in patients with intracranial tumors. The clinical outcome of glioma is usually poor due to abundant vascularity, fast growth and susceptibility of invasion to normal brain tissues. Our microarray study showed that lncRNA-LINC01116 was significantly upregulated in glioma tissues and played an important role in cell proliferation, cycle, migration, invasion and angiogenesis. In addition, vascular endothelial growth factor (VEGFA) may be the major target genes in the downstream of lncRNA-LINC01116. Dual luciferase assay showed that LINC01116 and VEGFA both contained a miR-31-5p binding site, and LINC01116 could regulate the expression of VEGFA through competitive absorption of miR-31-5p. RNA immunoprecipitation indicated that LINC01116 and VEGFA were present in the miR-31-5p-RISC complex, and biotinylated miR-31-5p pull-down assay suggested that there was a competitive relationship between LINC01116 and VEGFA to bind with miR-31-5p. Collectively, our study has identified a novel lncRNA-LINC01116 and clarified the role and mechanism of LINC01116 in the tumorigenesis of glioma. LINC01116 may prove to be a potential target for the clinical diagnosis and treatment of glioma.     

缺氧诱导血管内皮细胞中长链非编码RNALINC01116的表达及其功能的初步研究

目的探讨缺氧条件下人脐静脉内皮细胞(human umbilical vein endothelial cell,HUVEC)中长链非编码RNA(long non-coding RNA,lnc RNA)LINC01116的表达及其在炎症分子表达调控中的作用。方法采用三气培养箱模拟缺氧环境(1%O_2),常氧对照组细胞于普通培养箱(21%O_2)中常规培养。采用实时荧光定量PCR检测LINC01116及各炎症分子的m RNA水平。Western blot检测缺氧诱导因子-1α(hypoxia-inducible factor 1 alpha,HIF-1α)蛋白水平,并用葡萄糖转运体-1(glucose transporter 1,GLUT-1)的转录表达水平反映HIF-1的转录活性。免疫荧光法检测核转录因子NF-κB(nuclear factor of kappa B,NF-κB)活性亚基p65在细胞中的分布,并计算p65入核的细胞比例。结果 q RT-PCR的结果显示,缺氧条件下,LINC01116在HUVEC中持续高表达,与常氧对照组相比,差异均具有统计学意义(P<0.01)。经脯氨酸羟化酶抑制剂(DMOG)和去铁酰胺(DFX)处理后,常氧培养HUVEC中HIF-1α蛋白表达和GLUT-1的转录表达增加,LINC01116表达增高,与溶剂对照组相比,差异均具有统计学意义(P<0.01)。经YC-1和小干扰RNA处理后,缺氧培养HUVEC中HIF-1α蛋白表达和GLUT-1的转录表达下降,LINC01116的表达显著下降,与各对照组相比,差异均具有统计学意义(P<0.01)。缺氧24 h时,HUVEC中炎症分子TNF-α、IL-1β、ICAM、E-SELECTIN的m RNA水平增加,干扰LINC01116表达后,上述炎症分子的m RNA水平显著降低(P<0.01)。免疫荧光的实验显示,缺氧24 h后,细胞核内p65的分布增加,而干扰LINC01116表达后,p65入核的细胞比例下降,与对照组相比,差异均具有统计学意义(P<0.05)。结论缺氧通过HIF-1途径诱导血管内皮细胞LINC01116的表达增加;LINC01116可以通过调控p65入核,调节内皮细胞炎症分子的表达,参与介导缺氧血管内皮细胞炎症反应。     

LINC01224靶向miR-125b对口腔鳞癌细胞增殖及凋亡的影响

摘要：目的?探讨长链非编码RNA(LncRNA)LINC01224是否通过调控微小RNA-125b(miR-125b)的表达，从而影响口腔鳞癌(OSCC)细胞增殖及凋亡。方法?采用实时荧光定量聚合酶链反应(qRT-PCR)检测OSCC患者癌组织及癌旁组织中LINC01224的表达水平；体外培养OSCC细胞系CAL-27，将si-NC、si-LINC01224、si-LINC01224与anti-miR-NC、si-LINC01224与anti-miR-125b转染至CAL-27细胞；甲基噻唑基四唑(MTT)试验检测细胞增殖能力；流式细胞术检测细胞周期与细胞凋亡率；双荧光素酶报告试验验证LINC01224与miR-125b的靶向结合关系；western blot检测半胱氨酰天冬氨酸特异性蛋白酶3前体蛋白(pro-caspase-3)、增殖标记蛋白细胞增殖核抗原67(Ki67)、活化的含半胱氨酸的天冬氨酸蛋白水解酶3(clv-caspase-3)、P21蛋白的表达水平。结果?与癌旁组织相比，OSCC患者癌组织中LINC01224的表达水平(1.00±0.05 vs 2.43±0.17)显著升高(t=94.345，P<0.05)，miR-125b的表达水平(0.98±0.06 vs 0.22±0.02)显著降低(t=14.838，P<0.05)；与si-NC组比较，si-LINC01224组细胞存活率[(100.02±6.73)% vs (47.94±4.69)%]显著降低(t=19.047，P<0.05)，G1期细胞比例[(31.03±3.01)% vs (42.29±4.12)%]显著增加(t=6.615，P<0.05)，S期细胞比例[(34.18±3.38)% vs (23.49±2.57)%]显著减少(t=7.553，P<0.05)，细胞凋亡率[(8.10±0.92)% vs (24.17±1.74)%]显著升高(t=24.494，P<0.05)，Ki67、pro-caspase-3蛋白水平显著降低(P<0.05)，P21、clv-caspase-3蛋白水平显著升高(P<0.05)；双荧光素酶报告试验证实LINC01224与miR-125b靶向结合；与si-LINC01224+anti-miR-NC组比较，si-LINC01224+anti-miR-125b组细胞存活率[(48.03±4.57)% vs (90.01±5.59)%]显著升高(t=17.442，P<0.05)，细胞凋亡率[(24.11±1.58)% vs (12.81±1.12)%]显著降低(t=17.504，P<0.05)，G1期细胞比例[(42.27±4.10)% vs (35.09±3.18)%]显著减少(t=4.151，P<0.05)，S期细胞比例[(23.53±2.54)% vs (30.03±2.96)%]显著增加(t=4.999，P<0.05)，pro-caspase-3、Ki67蛋白水平显著升高(P<0.05)，clv-caspase-3、P21蛋白水平显著降低(P<0.05)。结论?LINC01224能够靶向调控miR-125b的表达，从而促进OSCC细胞增殖及抑制细胞凋亡。     

The long noncoding RNA LINC01207 promotes proliferation of lung adenocarcinoma

Lung adenocarcinoma (LAD) and lung squamous cell cancer (LSCC) are two most common histological types of lung cancer, while they differ in many aspects. Recent evidence shows that long non-coding RNAs (lncRNAs) play an important role in the process of cancer initiation and progression. Thus, characterization of LAD and LSCC associated lncRNAs may help understand the difference between LAD and LSCC. Here, we analyzed three sets of RNA-seq data, including LAD RNA-seq data from TCGA project. We identified a novel lncRNA, long intergenic non-protein coding RNA 1207 (LINC01207) which was significantly up-regulated in LAD tissues compared with paired non-tumor tissues (5.78 fold increase, P<0.05), while there was no significant differences between LSCC tissues and adjacent non-tumor tissues. The expression level of LINC01207 was associated with TNM stage of LAD patients, and higher LINC01207 level indicated advanced TNM stage (P<0.05) and shorter survival (HR=2.53, P<0.05). By small interfering RNA (siRNA) mediated knockdown of LINC01207, we determined the biological function of LINC01207 in A549 cell line. After knockdown of LINC01207, cell proliferation ability was inhibited. Further analysis showed that after silence of LINC01207, the percentage of apoptotic cells significantly increased. By RNA immunoprecipitation and Chromatin immunoprecipitation assay, we demonstrated that LINC01207 could bind with EZH2 and mediated trimethylation of histone 3 lysine 27 at the promoter region of Bad, an important pro-apoptotic gene. Finally, we developed xenograft tumor models in nude mice and xenograft tumors derived from A549 cells transfected with siRNA-LINC01207 had significantly lower tumor weight and smaller tumor volume. In summary, the novel lncRNA, LINC01207 is specifically up-regulated in LAD but not in LSCC; and LINC01207 could promote LAD cell growth both in vivo and in vitro.     

Clinical Significance of CA-199 and LINC01197 in Pancreatic Cancer

This study aimed to explore the expression and clinical significance of LINC01197 in the serum of patients with pancreatic cancer (PC). Methods: A total of 50 PC patients (patient group) treated in our hospital from March 2012 to April 2014 were collected, and another 50 healthy people (normal group) were collected for physical examination. The expression of LINC01197 in the serum of the two groups was detected by qRT-PCR method, and the expression of CA-199 in serum was detected by Roche automatic biochemistry. The expression and diagnostic values of CA-199 and LINC01197 in PC were analyzed, and the relationship between LINC01197 and the prognosis of PC patients was observed. Results: The expression of CA-199 in the patient group was significantly higher than in the normal group (p < 0.001). The area under the curve was 0.791 and 0.944, respectively. The incidence rate of Phases III + IV, lymphatic invasion, and distant metastasis in patients with low expression of LINC01197 is significantly higher than that in patients with high expression and has higher diagnostic value. With the progress of clinical staging, the expression of TNM gradually decreased and there were differences between groups (p < 0.001). Sperman test analysis found that the decreased TNM staging of LINC01197 gradually increased (r = – 0.816, p < 0.001), and the area under the curve of LINC01197 distinguishing phase I and phase II + phase III + phase IV was 0.930. The 1-year survival rate and 5- year survival rate of patients in low expression group are lower than those in the high expression group (P1 year = 0.037, P5 year = 0.014). Distant metastasis is an independent prognostic factor for PC patients to survive for 1 to 5 years. Differentiation, TNM staging, and LINC01197 are independent prognostic factors for PC patients to survive for 5 years. Conclusion: The low expression of LINC01197 in PC patients indicates poor prognosis of patients and is expected to be a potential diagnostic and prognostic indicator of PC.     

LINC00205 promotes proliferation,migration and invasion of HCC cells by targeting miR-122-5p

Long non-coding RNAs (lncRNAs) have been identified as crucial regulators in the tumorigenesis and progression of hepatocellular carcinoma (HCC). Recently, long intergenic non-protein coding RNA 205 (LINC00205) has been identified as a prognostic biomarker in HCC. However, the biological role of LINC0205 and its potential molecular mechanism are poorly investigated. Here, we found that the expression of LINC00205 was dramatically up-regulated in HCC tissues compared to adjacent nontumor tissues. Furthermore, the level of LINC00205 in both Hep3B and Huh7 cells was prominently higher than that in normal hepatic cell line LO2. Notably, the high expression of LINC00205 was strongly correlated with tumor size ≥5 cm, venous infiltration and advanced tumor stages. Functionally, LINC00205 knockdown obviously repressed the proliferation, migration and invasion of Hep3B and Huh7 cells in vitro. An inverse correlation between LINC00205 and miR-122-5p was detected in HCC tissues. Interestingly, LINC00205 knockdown increased the level of miR-122-5p in both Hep3B and Huh7 cells. Mechanistically, luciferase reporter assay demonstrated LINC00205 acted as a competing endogenous RNA (ceRNA) by directly interacting with miR-122-5p. More importantly, miR-122-5p overexpression significantly restrained the proliferation, migration and invasion of HCC cells. Collectively, our study provides solid evidence to support the oncogenic role of LINC00205 in HCC, which may be benefit for the improvement of HCC therapy.     

LINC00346 regulates glycolysis by modulation of glucose transporter 1 in breast cancer cells

Most cancer cells preferentially metabolize glucose by glycolysis rather than oxidative phosphorylation to proliferate efficiently. LncRNAs have been proposed as crucial regulators in pathophysiological processes including cell growth, apoptosis and glucose metabolism. However, little is known regarding the specific role of LINC00346 in regulating glucose metabolism in breast cancer. LINC00346 and miR-148a/b expression in breast cancer cells was detected by qRT-PCR. The relationships between LINC00346, glucose transporter 1 (GLUT1) and miR-148a/b in breast cancer cells were explored by luciferase reporter assay. Cell proliferation and apoptosis were evaluated by CCK-8 and flow cytometry analysis, respectively. Glycolysis was detected by measuring the glucose uptake and lactate production. Results showed that LINC00346 was over-expressed while miR-148a/b was low-expressed in breast cancer cells. miR-148a/b were direct targets of LINC00346 in breast cancer cells. LINC00346 knockdown inhibited cell proliferation and glycolysis, and induced apoptosis by upregulating miR-148a/b in breast cancer cells. Furthermore, we found that LINC00346 knockdown repressed GLUT1 expression in breast cancer cells by upregulating miR-148a/b. In conclusion, LINC00346 knockdown suppressed breast cancer cell glycolysis by upregulating miR-148a/b and repressing GLUT1 expression.