miR-96-5p靶向FOXO1调节脑缺血再灌注损伤机制

摘要 目的：探究miR-96-5p在脑缺血再灌注损伤（CIRI）中的作用及机制。方法：通过qRT-PCR检测36例确诊的缺血性脑卒中患者（IS患者组）和30例健康体检者（健康组）的血清miR-96-5p水平。将PC12细胞分为5组：对照组、NC-ag组、miR-96-5p-ag组、NC-an组、miR-96-5p-an组。采用Lipofectamine 2000对PC12细胞进行转染,通过qRT-PCR验证转染效率。将PC12细胞分为6组：对照组、氧糖剥夺/复氧复糖（OGD/R）组、OGD/R+NC-ag组、OGD/R+miR-ag组、OGD/R+NC-an组、OGD/R+miR-an组。根据分组对PC12细胞进行OGD/R处理和转染。通过MTT法检测PC12细胞活力,TUNEL法检测PC12细胞凋亡。采用改良Longa法建立大鼠CIRI模型,然后将大鼠分为假手术组、CIRI组、CIRI+NC-an组和CIRI+miR-an组。假手术组和CIRI组大鼠尾静脉注射生理盐水,CIRI+NC-an组和CIRI+miR-an组大鼠分别尾静脉注射NC-antagomir和miR-96-5p-antagomir。然后检测各组大鼠的神经功能评分、脑梗死体积和脑组织细胞凋亡情况。按照试剂盒说明书测定PC12细胞和大鼠脑组织中MDA、SOD和GSH-Px的含量。通过qRT-PCR检测PC12细胞和大鼠脑组织miR-96-5p和Forkhead box O1（FOXO1） mRNA水平,通过Western blot检测FOXO1、Ac-FOXO1、Bax和Bcl-2的蛋白表达水平。结果：与Health组比较,IS组患者的血清miR-96-5p水平显著升高（P<0.001）。与对照组和NC-ag组比较,miR-96-5p-ag组的miR-96-5p水平升高,FOXO1的mRNA和蛋白表达水平均降低,FOXO1的乙酰化水平升高（P<0.05）。与对照组和NC-an组比较,miR-96-5p-an组的miR-96-5p水平降低,FOXO1的mRNA和蛋白表达水平均升高,FOXO1的乙酰化水平降低（P<0.05）。与OGD/R组和OGD/R+NC-an组比较,OGD/R+miR-an组的相对细胞活力升高,TUNEL阳性率降低,Bax的蛋白相对表达量降低,Bcl-2的蛋白相对表达量升高,MDA水平降低,SOD和GSH-Px水平升高,miR-96-5p水平降低,FOXO1的mRNA和蛋白表达水平升高,FOXO1的乙酰化水平降低（P<0.05）。与CIRI组和CIRI+NC-an组比较,CIRI+miR-an组大鼠的神经功能评分和脑梗死体积降低,TUNEL阳性率降低,Bax的蛋白相对表达量降低,Bcl-2的蛋白相对表达量升高,MDA水平降低,SOD和GSH-Px水平升高,miR-96-5p水平降低,FOXO1的mRNA和蛋白表达水平升高,FOXO1的乙酰化水平降低（P<0.05）。结论：miR-96-5p在CIRI发生过程中表达上调,而下调miR-96-5p表达可能通过负调控FOXO1以减轻CIRI程度。     

Decoy Oligonucleotide Rescues IGF1R Expression from MicroRNA-223 Suppression

A mature miRNA generally suppresses hundreds of mRNA targets. To evaluate the selective effect of synthetic oligonucleotide decoys on hsa-miR-223 activity, reporters containing 3’ untranslated regions (UTR) of IGF1R, FOXO1, POLR3G, FOXO3, CDC27, FBXW7 and PAXIP1 mRNAs were constructed for the luciferase assay. The oligonucleotide decoys were designed and synthesized according to mature miR-223 sequence and its target mRNA sequence. Quantitative RT-PCR & western analysis were used to measure miR-223-targeted mRNA expression, Interestingly, apart from the antisense oligonucleotide, decoy nucleotides which were complementary to the 5’, central or 3’ region of mature miR-223 suppressed miR-223 targeting the 3’UTR of IGF1R, FOXO1, FOXO3, CDC27, POLR3G, and FBXW7 mRNAs and rescued the expression of these genes to varying degrees from miR-223 suppression at both mRNA and protein levels. All decoys had no effect on PAXIP1 which was not targeted by miR-223. The decoy 1 that was based on the sequence of IGF1R 3’UTR rescued the expression of IGF1R more significantly than other decoy nucleotides except the antisense decoy 4. Decoy 1 also rescued the expression of FOXO3 and POLR3G of which their 3’UTRs have similar binding sites for miR-223 with IGF1R 3’UTR. However decoy 1 failed to recover Sp1, CDC27 and FBXW7 expression. These data support that the sequence-specific decoy oligonucleotides might represent exogenous competing RNA which selectively inhibits microRNA targeting.     

miR-199a-3p负调控CBX7影响肺癌细胞NCI-H460的生物学行为研究

目的:探讨mi R-199a-3p负调控CBX7影响肺癌细胞NCI-H460的生物学行为。方法:qRT-PCR法检测并比较肺癌组织、癌旁正常组织、肺癌细胞、正常肺上皮细胞中的mi R-199a-3p m RNA相对表达量。比较远处转移肺癌组织、未转移肺癌组织中mi R-199a-3p m RNA相对表达量。qRT-PCR法、Western Blot法检测并比较肺癌组织、癌旁正常组织中的CBX7 m RNA及蛋白的表达水平。荧光素酶活性法检测mi R-199a-3p与靶基因CBX7的结合。比较mi R-199a-3p模拟物转染组与阴性对照组的肺癌细胞中的CBX7 m RNA相对表达量及CBX7蛋白表达水平。CCK8实验检测mi R-199a-3p对肺癌细胞增殖的促进作用。Tranwell实验检测mi R-199a-3p对肺癌细胞侵袭与迁移能力的影响。结果:肺癌组织中mi R-199a-3p明显高于癌旁正常组织,发生远处转移的肺癌组织中mi R-199a-3p m RNA的表达量明显高于未发生转移的肺癌组织,差异有统计学意义(P<0.001)。肺癌组织中CBX7m RNA、CBX7蛋白表达水平均明显低于癌旁正常组织,差异有统计学意义(P<0.001)。荧光素酶活性法证实mi R-199a-3p可与靶基因CBX7结合抑制CBX7的表达。肺癌细胞中mi R-199a-3p m RNA的相对表达量明显高于正常肺上皮细胞,CBX7 m RNA相对表达量明显低于正常肺上皮细胞(P<0.05)。对于肺癌细胞,mi R-199a-3p模拟物转染组的CBX7 m RNA相对表达量及CBX7蛋白表达水平均明显低于阴性对照组(P<0.001)。CCK8实验证实mi R-199a-3p能够促进肺癌细胞的增殖,Tranwell实验证实mi R-199a-3p对肺癌细胞侵袭与迁移具有积极的促进作用。结论:mi R-199a-3p在肺癌的发生发展过程中发挥重要作用,能够通过抑制CBX7基因的表达,促进肺癌细胞的增殖、侵袭和转移。     

RP4 通过miR-183-5p.1上调FOXO1抑制乳腺癌细胞增殖

近年来,越来越多的证据表明,长非编码RNAs在肿瘤发生发展中发挥重要作用。位于12号染色体的长非编码RNA RP4-816N1.7（简称RP4）在乳腺癌细胞中的作用未见报道。我们通过实时荧光定量PCR证实,RP4在乳腺癌细胞中的表达量普遍低于其在正常乳腺上皮细胞MCF-10A中的表达量。RP4在MCF-7和MDA-MB-231中表达量分别比其在MCF-10A中的表达量下调21.57%和91.33%。过表达RP4可明显抑制乳腺癌细胞增殖。敲低RP4可显著增加乳腺癌细胞的增殖能力。生物信息学预测,RP4可能与miR-183-5p.1结合,且叉头蛋白O1(FOXO1)可能是miR-183-5p.1的潜在靶标。实时荧光定量PCR结果提示,RP4可下调miR-183-5p.1,而miR-183-5p.1也可下调RP4和FOXO1的表达。双荧光素酶报告基因结果证实,miR-183-5p.1可与RP4结合,下调其表达,也能与FOXO1 3′UTR结合,抑制其mRNA和蛋白质水平的表达量。最后,本文通过BrdU实验证实,RP4通过FOXO1抑制乳腺癌细胞的增殖。总之,RP4通过内源性结合miR-183-5p.1,上调FOXO1表达,进而抑制乳腺癌细胞增殖。     

miR-182在前列腺癌组织中的表达及其对前列腺癌细胞增殖和凋亡的影响

目的:观察前列腺癌组织及不同前列腺癌细胞系中miR-182的表达,并探讨下调其表达对前列腺癌细胞增殖和凋亡的影响及机制。方法:采用实时荧光定量PCR(q RT-PCR)检测30例前列腺癌组织和30例相应的癌旁组织以及前列腺正常上皮RWPE-1细胞、前列腺癌PC-3、LNCa P和DU145细胞中miR-182的表达,进一步采用Lipfectamine 2000脂质体转染miRNA-182 inhibitor和阴性对照miRNA于PC-3细胞后,通过噻唑蓝(MTT)比色法检测细胞增殖情况,流式细胞术检测细胞凋亡率,免疫印迹(Western blot)法检测转录因子FOXO1、血管内皮生长因子(VEGF)和抑癌基因p53蛋白的表达。结果:miR-182在前列腺癌组织中的表达明显高于癌旁组织(P0.05);miR-182在前列腺癌细胞系PC-3、LNCa P和DU145中的表达均高于前列腺正常上皮细胞RWPE-1(P0.05),其中PC-3细胞中miR-182表达水平最高。转染miRNA-182 inhibitor至PC-3细胞成功下调miR-182表达后,细胞的增殖能力明显受到抑制,细胞凋亡能力明显增强,FOXO1表达水平显著升高,VEGF和p53的表达明显降低,差异均具有统计学意义(P0.05)。结论:miR-182在前列腺癌组织及细胞中呈高表达,下调miR-182的表达可能通过增加FOXO1的表达并减少VEGF和p53的表达,抑制前列腺癌细胞增殖并诱导细胞凋亡。     

MiR-223 inhibitor suppresses proliferation and induces apoptosis of thyroid cancer cells by down-regulating aquaporin-1

To investigate the effect of miR-223 on thyroid cancer cells, further to study its potential mechanisms. The difference in miR-223 expression between normal thyroid Nthy-ori3-l cells and thyroid cancer SW579 cells was detected by PCR. The miR-223 overexpression and silencing vector transfection were verified by qRT-PCR. To further investigate the role of miR-223 in AQP-1, the AQP-1 siRNA vector was transfected on the basis of transfection of miR-223 inhibitor vector. The cell proliferation was detected by plate cloning, MTT, and cellular immunofluorescence assays. Cell cycle and apoptosis were detected by flow cytometry. Western blot was used to detect the expression of AQP-1 protein. The expression of miR-223 in SW579 cells was higher than that in normal cells. After transfection with miR-223 mimic, miR-223 expression was increased in SW579 cells. MiR-223 inhibitor transfection can inhibit SW579 cells proliferation, promote apoptosis, and inhibit cell cycle G0/G1 arrest. The SW579 cells proliferation was decreased, and the apoptosis rate was increased after transfection of AQP-1 silencing vector. Compared with the AQP-1 siRNA group, the SW579 cells proliferation rate was further reduced, and the apoptosis rate was significantly increased after co-transfection of miR-223 silencing vector and AQP-1 silencing vector. AQP-1 protein was highly expressed in SW579 cells, and miR-223 inhibitor can down-regulate the expression of APQ-1 protein. The expression AQP-1 protein was significantly reduced after transfected with AQP-1 silencing vector. Inhibition of miR-223 expression could suppress proliferation and promote apoptosis of SW579, and its mechanism is related to down-regulation of APQ-1 protein expression.     

MicroRNA-217 Promotes Angiogenesis of Human Cytomegalovirus-Infected Endothelial Cells through Downregulation of SIRT1 and FOXO3A

Human cytomegalovirus(HCMV) infection has been shown to contribute to vascular disease through the induction of angiogenesis. However, the role of microRNA in angiogenesis induced by HCMV infection remains unclear. The present study was thus designed to explore the potential effect of miR-1217 on angiogenesis and to disclose the underlying mechanism in endothelial cells. We found that HCMV infection of endothelial cells(ECs) enhanced expression of miR-217 and reduced SIRT1 and FOXO3A protein level in 24 hours post infection(hpi). Transfection of miR-217 inhibitor not only depressed cellular migration and tube formation induced by HCMV infection, but also enhanced SIRT1 and FOXO3A protein expression. Additionally, luciferase assay confirmed that miR-217 directly targeted FOXO3A mRNA 3`UTR. Furthermore, pretreatment with resveratrol depressed motility and tube formation of HCMV-infected ECs, which could be reversed by SIRT1 siRNA. Similarly, delivery of FOXO3A overexpression lentivirus suppressed proliferative rate, migration and tube formation of HCMV-infected ECs, which reversed by transfection of FOXO3A siRNA. In summary, HCMV infection of endothelial cells induces angiogenesis by both of miR-217/SIRT1 and miR-217/FOXO3A axis.     

miR-29a通过调控PTEN表达对脂多糖诱导人肺微血管内皮细胞损伤的保护作用研究*

目的:探讨miR-29a在脂多糖(LPS)诱导人肺微血管内皮细胞(HPMVECs)损伤中的作用及机制。方法:构建LPS损伤HPMVECs模型。RT-qPCR检测miR-29a表达变化;试剂盒测乳酸脱氢酶(LDH)释放量;MTT和流式细胞术分别检测细胞存活率及凋亡率;Western blot测蛋白质表达水平;Microcosm、starBase、Pictar、TargetScan软件预测 miR-29a的可能靶基因,双萤光素酶实验验证miR-29a和PTEN的靶向关系。结果:使用LPS处理HPMVECs,显著降低细胞中miR-29a的表达和细胞存活率,诱导LDH释放量和HPMVECs凋亡率增加,上调细胞中PTEN、Bim蛋白表达,下调p-Akt/Akt、p-FOXO3a/FOXO3a表达 (P<0.05);过表达miR-29a逆转LPS对HPMVECs的损伤作用。萤光素酶报告基因实验证实miR-29a 靶向PTEN,转染miR-29a mimics显著下调PTEN蛋白表达,转染miR-29a inhibitors明显上调PTEN蛋白表达 (P<0.05),但PTEN mRNA表达水平差异均无统计学意义(P>0.05)。结论:过表达miR-29a可能通过抑制PTEN蛋白的表达水平、激活Akt/FOXO3a/Bim信号通路对LPS致HUVECs的损伤发挥保护作用。     

miR-582-5p Is Upregulated in Patients with Active Tuberculosis and Inhibits Apoptosis of Monocytes by Targeting FOXO1

Macrophage apoptosis is a host innate defense mechanism against tuberculosis (TB). In this study, we found that percentage of apoptotic cells in peripheral blood monocytes from patients with active TB was lower than that from healthy controls (p<0.001). To understand whether microRNAs can modulate apoptosis of monocytes, we investigated differentially expressed microRNAs in patients with active TB. miR-582-5p was mainly expressed in monocytes and was upregulated in patients with active TB. The apoptotic percentage of THP-1 cells transfected with miR-582-5p mimics was significantly lower than those transfected with negative control of microRNA mimics (p<0.001), suggesting that miR-582-5p could inhibit apoptosis of monocytes. To our knowledge, the role of miR-582-5p in regulating apoptosis of monocytes has not been reported so far. Systematic bioinformatics analysis indicated that FOXO1 might be a target gene for miR-582-5p and its 3′UTR contains potential binding sites for miR-582-5p. To determine whether miR-582-5p could influence FOXO1 expression, miR-582-5p mimics or negative control of microRNA mimics were transfected into THP-1 cells. RT-PCR and western blot analysis showed that the miR-582-5p could suppress both FOXO1 mRNA and protein expression. Co-transfection of miR-582-5p and FOXO1 3′UTR-luciferase reporter vector into cells demonstrated that significant decrease in luciferase activity was only found in reporter vector that contained a wild type sequence of FOXO1 3′UTR, suggesting that miR-582-5p could directly target FOXO1. In conclusion, miR-582-5p inhibited apoptosis of monocytes by down-regulating FOXO1 expression and might play an important role in regulating anti-M. tuberculosis directed immune responses.     

Mir-335-5p靶向G6PD对结肠癌细胞增殖、凋亡的影响

目的:探讨Mir-335-5p通过靶向G6PD对结肠癌细胞增殖、凋亡的影响.方法:设置正常结肠细胞组、空白对照组、NC组、miRNA-335-5p mimic组;体外培养结肠上皮细胞(IEC)和人源性结肠癌细胞SW480,并对NC组、miRNA-335-5p mimic组细胞进行转染;采用RT-qPCR检测各组细胞中m...     

MiRNA-1271-5p regulates osteogenic differentiation of human bone marrow-derived mesenchymal stem cells by targeting forkhead box O1 (FOXO1)

Forkhead box O1 (FOXO1) is a key regulator of osteogenesis. The aim of this study was to identify the mechanisms of microRNAs (miRNAs) targeting FOXO1 in osteogenic differentiation of human bone marrow mesenchymal stem cells (hMSCs). Three miRNA target prediction programs were used to search for potential miRNAs that target FOXO1. Quantitative real-time polymerase chain reaction was conducted to detect the expression of miR-1271-5p and FOXO1 during osteogenic differentiation. Target gene prediction and screening, luciferase reporter assay was used to verify the downstream target gene of miR-1271-5p. The expression levels of FOXO1 and Runx2 were detected by RT-qPCR and Western blot analysis. Alkaline phosphatase (ALP) activity and matrix mineralization were detected by biochemical methods. The expression levels of Runx2, ALP, and osteocalcin were detected by RT-qPCR. Our results showed that miR-1271-5p was downregulated during osteogenic induction. And the expression levels of miR-1271-5p were higher in osteoporotic tissues than that in adjacent nonosteoporotic tissues. The expression levels of FOXO1 were lower in osteoporotic tissues than that in adjacent nonosteoporotic tissues. And a negative correlation was found between miR-1271-5p and FOXO1 in osteoporotic tissues. Overexpression of miR-1271-5p downregulated FOXO1 and inhibited osteogenic differentiation in hMSCs. Overexpression of miR-1271-5p downregulated the expression of osteogenic markers and reduced ALP activity. In addition, ectopic expression of FOXO1 reversed the effect of miR-1271-5p on osteogenic differentiation. In conclusion, miR-1271-5p functioned as a therapeutic target of osteogenic differentiation in hMSCs by inhibiting FOXO1, which provides valuable insights into the use of miR-1271-5p as a target in the treatment of osteoporosis and other bone metabolic diseases.     

miR-223在结肠癌组织中的表达及促进结肠癌细胞迁移侵袭的机制研究

目的:探讨微小RNA-223 (mi R-223)在结肠癌组织中的表达及对结肠癌HT-29细胞侵袭、迁移能力的影响及机制。方法:检测mi R-223在结肠癌组织与癌旁组织中的表达。通过脂质体转染法将mi R-223模拟物(mi R-223 mimics,mi R-223 mimics组)及microRNA无关序列(mi R-223 NC,NC组)转染入结肠癌HT-29细胞。采用Real-time PCR检测转染后细胞中mi R-223和TWIST的表达,Western blot检测TWIST的蛋白表达,Tranwell检测细胞的迁移与侵袭能力。双荧光素酶报告基因检测mi R-223对TWIST基因启动子活性的影响。采用Transwell迁移与侵袭实验检测mi R-223 mimic及Twist si RNA共转染后人结肠癌细胞系HT-29迁移与侵袭能力的变化。结果:与癌旁结肠组织比较,mi R-223在结肠癌组织中呈现明显高表达(P0.05);与空白对照组和mi R-223 NC组比较,转染mi R-223 mimics后的HT-29细胞中的mi R-223表达显著增加(P0.05)。与阴性对照组和空载转染组相比较,mi R-223 mimics转染组穿透的细胞数目明显增加(P0.05),且mi R-223 mimics转染组的细胞侵袭能力显著增强(P0.05)。与mi R-223 NC组和空白对照组比较,转染mi R-223 mimics的HT-29细胞的TWIST基因m RNA和蛋白表达均显著增加(P0.05)。双荧光素酶检验结果显示TWIST为mi R-223的下游靶基因。共转染TWIST si RNA和mi R-223 mimics的结肠癌HT-29细胞的迁移与侵袭能力较单独转染mi R-223 mimics的HT-29细胞显著减弱(P0.05)。结论:mi R-223可能通过上调下游靶基因TWIST水平促进结肠癌HT-29细胞的迁移与侵袭。     

丙型肝炎病毒核心蛋白通过FOXO1/PGC-1α途径上调磷酸烯醇式丙酮酸羧基酶的转录

【目的】分析丙型肝炎病毒(HCV)核心蛋白(CORE)稳定表达对磷酸烯醇式丙酮酸羧基酶(PCK1)转录水平的影响,并分析HCV CORE调控PCK1转录的分子机制,为进一步阐明HCV感染致2型糖尿病机理的探讨提供新的思路。【方法】利用反转录病毒表达系统构建稳定表达HCV CORE的Huh7-lunet-core细胞系。采用Real-time PCR和萤光素酶报告基因技术检测Huh7-lunet-core细胞系中PCK1、FOXO1以及PGC-1α转录水平变化,并结合Western blot分析FOXO1的活性变化。【结果】HCV CORE的稳定表达显著增强PCK1的转录水平,HCV CORE不影响FOXO1的转录和表达水平,但降低FOXO1的磷酸化水平,激活了FOXO1的转录活性,并增强PGC-1α的mRNA表达水平。【结论】HCV CORE在Huh7-lunet细胞中的稳定表达激活FOXO1的转录活性,并与PGC-1α协同作用,上调PCK1的转录,从而导致肝糖异生过度发生,对HCV CORE调控PCK1转录的分子机制的揭示可能为HCV感染相关的糖尿病的治疗提供新的靶点。