miR-211对高糖诱导下晶状体上皮细胞氧化应激反应的调控作用

目的 探讨miR-211对高糖诱导下晶状体上皮细胞氧化应激反应的调控作用及其可能存在的作用机制.方法 将HLEC-B3细胞在含不同浓度(0、10、20、40 mmol/L)葡萄糖的培养基中培养48 h,RT-PCR检测细胞miR-211表达,Western blot检测细胞SIRT1蛋白表达,试剂盒检测总抗氧化能力(T...     

miR-221与miR-222通过靶基因TIMP3调控胶质瘤细胞侵袭能力

目的 探讨miR-221和miR-222在胶质瘤细胞侵袭过程中的作用及其机制.方法 采用反义寡核苷酸下调miR-221和miR-222表达,Transwell、Western blot、荧光素酶实验及体内实验分别检测细胞侵袭能力、体内肿瘤生长、相关基因蛋白表达变化及靶基因鉴定.结果 下调miR-221和miR-222表达能明显抑制胶质瘤细胞侵袭能力,同时相关侵袭蛋白MMP2和MMP9表达下降.miRNA靶基因预测软件分析、Western blot、荧光素酶实验证实TIMP3是miR-221和miR-222的靶基因.裸鼠皮下肿瘤模型显示下调miR-221和miR-222表达抑制体内肿瘤生长.免疫组化发现TIMP3表达上调,MMP2和MMP9表达下调.结论 在胶质瘤细胞中,侵袭相关蛋白TIMP3是miR-221和miR-222的一个新靶基因.

Abstract：

Objective To investigate the role and mechanism of miR -221 and miR -222 in glioma cell invasion. Method After reduction of miR -221 and miR -222 by antisense oligonucleotides, cell invasion,invasion related - gene expression and target identification were determined by Transwell assay, Western blot analysis and luciferase reporter assay,respectively. Moreover,the effects of miR -221 and miR -222 on xenograft tumors in nude mice were also observed. Results Down - regulation of miR - 221 and miR - 222 decreased glioma cell invasion in vitro, and inhibited glioma growth in a subcutaneous mouse model. Furthermore,down -regulation of miR -221 and miR - 222 resulted in obvious inactivation of MMP2 and MMP9. Western blot analysis and luciferase reporter assay showed that the reduction of miR - 221 and miR -222 repressed TIMP3 protein expression and TIMP3 mRNA 3'UTR existed the biding sites of miR -221 and 222. Conclusions TIMP3 is a novel target of miR -221 and miR -222 in glioma cell invasion.     

MicroRNA-424在肿瘤发生中的作用和机制研究进展

MiR-424是miR-16家族成员。近年研究表明miR-424与肿瘤的发生、发展及治疗预后密切相关。本文对miR-424在乳腺癌、宫颈癌、肺癌、肝癌及结直肠癌等多种肿瘤及白血病中的表达变化、作用及机制进行综述。研究发现miR-424的表达受多种因素的影响,miR-424可作为肿瘤诊断、分期、预后的生物标记物,可用于明确肿瘤范围,也可作为肿瘤的治疗靶物。     

环状RNA 丝氨酸/苏氨酸蛋白扰动样激酶1 和微小RNA-214在缺血性脑卒中病人中的表达及意义

目的 探究环状RNA丝氨酸/苏氨酸蛋白扰动样激酶1(Circ TLK1)和微小RNA(miR)-214在缺血性脑卒中(IS)病人中的表达及意义。方法 选取2019年4月至2021年4月在广元市中心医院治疗的97例IS病人为观察组,根据美国国立卫生研究院卒中量表(NIHSS)评分将IS病人分为轻度组33例、中度组45例、重度组19例,另选取85例健康体检者为健康组。采用实时荧光定量逆转录聚合酶链反应(qRT-PCR)检测所有病人血清Circ TLK1和miR-214水平。对IS病人进行90 d的预后随访,按照改良Rankin量表(mRS)分为预后良好组和预后不良组,分析并比较不同预后病人的临床指标。多因素logistic回归分析IS病人预后不良的影响因素。受试者操作特征曲线(ROC曲线)分析Circ TLK1和miR-214对IS病人预后的预测价值。结果与健康组相比,观察组血清Circ TLK1［(1.83±0.22)比(1.03±0.12)］和miR-214［(2.64±0.49)比(1.07±0.13)］均显著性上调(P<0.05)。与轻度组相比,中度组和重度组病人血清Circ TLK1和miR-214均显著性上调,与中度组相比,重度组病人血清CircTLK1和miR-214水平显著上升(P<0.05)。观察组病人90 d预后随访结果显示,预后良好组病人63例,预后不良组病人34例。两组病人同型半胱氨酸(Hcy)、三酰甘油、梗死体积、发病到住院的时间、入院时NIHSS评分、Circ TLK1、miR-214水平之间差异有统计学意义(P<0.05)。多因素logistic回归分析显示,入院时NIHSS评分高、发病到住院的时间长、Circ TLK1、miR-214高水平是IS病人预后不良的独立危险因素(P<0.05)。ROC曲线分析结果显示,Circ TLK1和miR-214对IS病人预后评估价值的曲线下面积(AUC)分别为0.86、0.83,灵敏度分别为91.20%、67.60%,特异度分别为74.60%、90.50%。结论 Circ TLK1和miR-214在IS病人血清中呈高表达,二者是IS病人预后不良的独立危险因素,对病人的预后具有一定的评估价值。     

微小 RNA-199a-5p调控 Klotho表达对体外脑缺血再灌注大鼠氧 -葡萄糖剥夺 /再灌注诱导的肾上腺嗜铬瘤细胞损伤的保护作用

目的 探究抑制微小RNA-199a-5p(miR-199a-5p)表达对体外脑缺血再灌注(I/R)损伤大鼠模型氧-葡萄糖剥夺/再灌注(OGD/R)诱导的肾上腺嗜铬瘤细胞(PC12)损伤的保护作用,并进一步探讨Klotho在该过程中的作用。方法 将PC12细胞分为Control组、OGD/R组、miR-NC inhibitor组、miR-199a-5p inhibitor组、miR-199a-5p inhibitor+shRNA-pLKO.1组和miR-199a-5p inhibitor+shRNA-Klotho组。RT-qPCR或蛋白质印迹法(Western blotting)确定各组PC12细胞转染效率;胆囊收缩素/缩胆囊素八肽(CCK-8)和流式细胞术确定各组PC12细胞活力和凋亡率;试剂盒测量各组PC12细胞中活性氧(ROS)释放量、丙二醛(MDA)含量以及超氧化物歧化酶(SOD)和谷胱甘肽过氧化物酶(GSH-Px)活性;酶联免疫吸附试验(ELISA)法检测各组PC12细胞中肿瘤坏死因子-α(TNF-α)、白细胞介素-1β(IL-1β)、单核细胞趋化蛋白-1(MCP-1)和白细胞...     

miR-142-3p靶向调控mll-af4融合基因的实验研究

本研究探讨mll-af4融合基因的表观遗传学调控机制,以筛选靶向调控mll-af4融合基因的microRNA。利用Targetscan在线分析软件预测特异性靶向mllaf4基因3′端非翻译区域（3′-untranslated region,3′UTR）的microRNA,采用PCR方法从1例健康供者DNA中扩增mll-af4基因3′UTR序列,插入经EcoRI和PstI双酶切的荧光素酶报告载体pGL3-M,采用脂质体SuperFect包裹荧光素酶重组质粒及microRNA表达质粒转染293T细胞,应用双荧光素酶检测试剂盒测定荧光素酶活性。miR-142-3p mimics以脂质体Hiperfect转染至RS4;11细胞,选用实时定量PCR及Western blot检测mll-af4 mRNA及蛋白的表达。结果表明,成功构建了含有1935bp、2104bp和1371bp的mll-af4基因3′UTR序列的荧光素酶报告重组质粒pGL3-AF4-3′UTR,并通过酶切及基因测序方法鉴定得到证实。荧光素酶报告实验提示,miR-142组荧光素酶活性明显低于对照组。RS4;11细胞中过表达miR-142-3p可以明显下调MLL-AF4融合蛋白及mRNA表达。结论：miR-142-3p通过靶向结合mll-af4基因3′UTR的结合位点特异调控mll-af4基因表达。     

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.