AAV-mediated expression of p65shRNA and bone morphogenetic protein 4 synergistically enhances chondrocyte regeneration

BACKGROUND:Adeno-associated virus(AAV)gene therapy has been proven to be reliable and safe for the treatment of osteoarthritis in recent years.However,given the complexity of osteoarthritis pathogenesis,single gene manipulation for the treatment of osteoarthritis may not produce satisfactory results.Previous studies have shown that nuclear factorκB could promote the inflammatory pathway in osteoarthritic chondrocytes,and bone morphogenetic protein 4(BMP4)could promote cartilage regeneration.OBJECTIVE:To test whether combined application of AAV-p65shRNA and AAV-BMP4 will yield the synergistic effect on chondrocytes regeneration and osteoarthritis treatment.METHODS:Viral particles containing AAV-p65-shRNA and AAV-BMP4 were prepared.Their efficacy in inhibiting inflammation in chondrocytes and promoting chondrogenesis was assessed in vitro and in vivo by transfecting AAV-p65-shRNA or AAV-BMP4 into cells.The experiments were divided into five groups:PBS group;osteoarthritis group;AAV-BMP4 group;AAV-p65shRNA group;and BMP4-p65shRNA 1:1 group.Samples were collected at 4,12,and 24 weeks postoperatively.Tissue staining,including safranin O and Alcian blue,was applied after collecting articular tissue.Then,the optimal ratio between the two types of transfected viral particles was further investigated to improve the chondrogenic potential of mixed cells in vivo.RESULTS AND CONCLUSION:The combined application of AAV-p65shRNA and AAV-BMP4 together showed a synergistic effect on cartilage regeneration and osteoarthritis treatment.Mixed cells transfected with AAV-p65shRNA and AAV-BMP4 at a 1:1 ratio produced the most extracellular matrix synthesis(P<0.05).In vivo results also revealed that the combination of the two viruses had the highest regenerative potential for osteoarthritic cartilage(P<0.05).In the present study,we also discovered that the combined therapy had the maximum effect when the two viruses were administered in equal proportions.Decreasing either p65shRNA or BMP4 transfected cells resulted in less collagen II synthesis.This implies that inhibiting inflammation by p65shRNA and promoting regeneration by BMP4 are equally important for osteoarthritis treatment.These findings provide a new strategy for the treatment of early osteoarthritis by simultaneously inhibiting cartilage inflammation and promoting cartilage repair.

Polypyrimidine Tract-Binding Protein Enhances Zika Virus Translation by Binding to the 5'UTR of Internal Ribosomal Entry Site

Objectives To identify the 5'untranslated region of Zika virus(ZIKV 5'UTR)RNA-binding proteins and to investigate the impact of the binding protein on the activity of internal ribosomal entry site(IRES)located in ZIKV 5'UTR and virus production.Methods Interacting proteins in U251 cells were captured using tRSA-tagged ZIKV 5'UTR RNA and tRSA-ZIKV 5'UTR RNA-binding proteins were visualized by SDS-PAGE silver staining,Subsequently,liquid chromatographytandem mass spectrometry(LC-MS/MS),bioinformatics analysis,and Western blot were used to identify the candidate proteins binding to ZIKV 5'UTR.Dicistronic expression assay and plaque forming assay were performed to analyze the effect of the binding protein on ZIKV IRES activity and ZIKV production,respecitvely.Results tRSA RNA pull-down assay,LC-MS/MS,and Western blot analysis showed that polypyrimidine tractbinding protein(PTB)bound to the ZIKV 5'UTR.Furthermore,dual luciferase reporter assay revealed that overexpression of PTB significantly enhanced the IRES activity of ZIKV(t=10.220,P<0.001),while PTB knockdown had the opposite effect(t=4.897,P<0.01).Additionally,virus plaque forming assay demonstrated that up-regulation of PTB expression significantly enhanced viral titer(t=6.400,P<0.01),whereas reducing PTB expression level weakened virus infectivity(t=5.055,P<0.01).Conclusion PTB positively interacts with the ZIKV 5'UTR and enhances IRES activity and virus production.

Statistical potentials for 3D structure evaluation:From proteins to RNAs

Structure evaluation is critical to in silico 3-dimensional structure predictions for biomacromolecules such as proteins and RNAs.For proteins,structure evaluation has been paid attention over three decades along with protein folding problem,and statistical potentials have been shown to be effective and efficient in protein structure prediction and evaluation.In recent two decades,RNA folding problem has attracted much attention and several statistical potentials have been developed for RNA structure evaluation,partially with the aid of the progress in protein structure prediction.In this review,we will firstly give a brief overview on the existing statistical potentials for protein structure evaluation.Afterwards,we will introduce the recently developed statistical potentials for RNA structure evaluation.Finally,we will emphasize the perspective on developing new statistical potentials for RNAs in the near future.

Potential regulatory mechanism and clinical significance of synaptotagmin binding cytoplasmic RNA interacting protein in colorectal cancer

BACKGROUND Colorectal cancer(CRC)causes many deaths worldwide.Synaptotagmin binding cytoplasmic RNA interacting protein(SYNCRIP)is an RNA-binding protein that plays an important role in multiple cancers by epigenetically targeting some genes.Our study will examine the expression,potential effect,biological function and clinical value of SYNCRIP in CRC.AIM To examine the expression,potential effect,biological function and clinical value METHODS The expression of SYNCRIP was examined by immunohistochemistry arrays and high-throughput data.The effect of SYNCRIP gene in CRC cell growth was evaluated by CRISPR-Cas9 technology.The target genes of SYNCRIP were calculated using various algorithms,and the molecular mechanism of SYNCRIP in CRC was explored by mutation analysis and pathway analysis.The clinical value of SYNCRIP in prognosis and radiotherapy was revealed via evidence-based medicine methods.RESULTS The protein and mRNA levels of SYNCRIP were both highly expressed in CRC samples compared to nontumorous tissue based on 330 immunohistochemistry arrays and 3640 CRC samples.Cells grew more slowly in eleven CRC cell lines after knocking out the SYNCRIP gene.SYNCRIP could epigenetically target genes to promote the occurrence and development of CRC by boosting the cell cycle and affecting the tumor microenvironment.In addition,CRC patients with high SYNCRIP expression are more sensitive to radiotherapy.CONCLUSION SYNCRIP is upregulated in CRC,and highly expressed SYNCRIP can accelerate CRC cell division by exerting its epigenetic regulatory effects.In addition,SYNCRIP is expected to become a potential biomarker to predict the effect of radiotherapy.

Characterization and Expression Analysis of Four Glycine-Rich RNA-Binding Proteins Involved in Osmotic Response in Tobacco (Nicotiana tabacum cv. Xanthi)

Plants have developed many signals and specific genes＇ regulations at both transcriptional and post-transcriptional levels in order to tolerate and adapt to various environmental stresses. RNA-binding proteins （RBPs） play crucial roles in the post- transcriptional regulation via mRNA splicing, polyadenylation, sequence editing, transport, mRNA stability, mRNA localization, and translation. In this paper, four cDNAs of glycine-rich RNA-binding proteins （GR-RBPs）, named NtRGP-la, -lb, -2, and -3, were isolated from Nicotiana tabacum by RT-PCR analysis, and special emphases were given to the sequences alignment, phylogenetic analysis and gene expression. Sequences alignment revealed minor difference of cDNA sequences, but no difference of deduced proteins between N. sylvestris and N. tabacum. Phylogenetic alignment revealed that four cDNAs in tobacco were clustered into two different groups. NtRGP-2 and -3 were evolutionarily closest to Arabidopsis GR-RBPs genes and related to animal GR-RBPs genes, while NtRGP-la and -lb were closest to Gramineae GR-RBPs genes. The expression analyses of these four NtRGPs in response to different abiotic stresses revealed the similar expression pattern. Moreover, the four NtRGPs, especially NtRGP-la and NtRGP-3, were strongly induced by stresses including water, wound, cold, and high temperature, weakly induced by PEG, drought and SA, while reduced by NaC1 and unaffected by ABA treatment. The fact that all of these abiotic stresses included in our experiments affected the water balance and resulted in osmotic stress on cellular level, suggests that NtRGPs in tobacco should be a family of crucial osmosis-related proteins, and may play a key role in signal transduction with ABA-independent pathway under abiotic stresses.

RNA-binding proteins related to stress response and differentiation in protozoa

RNA-binding proteins(RBPs) are key regulators of gene expression. There are several distinct families of RBPs and they are involved in the cellular response to environmental changes, cell differentiation and cell death. The RBPs can differentially combine with RNA molecules and form ribonucleoprotein(RNP) complexes, defining the function and fate of RNA molecules in the cell. RBPs display diverse domains that allow them to be categorized into distinct families. They play important roles in the cellular response to physiological stress, in cell differentiation, and, it is believed, in the cellular localization of certain mRNAs. In several protozoa, a physiological stress(nutritional, temperature or pH) triggers differentiation to a distinct developmental stage. Most of the RBPs characterized in protozoa arise from trypanosomatids. In these protozoa gene expression regulation is mostly post-transcriptional, which suggests that some RBPs might display regulatory functions distinct from those described for other eukaryotes. mRNA stability can be altered as a response to stress. Transcripts are sequestered to RNA granules that ultimately modulate their availability to the translation machinery, storage or degradation, depending on the associated proteins. These aggregates of mRNPs containing mRNAs that are not being translated colocalize in cytoplasmic foci, and their numbers and size vary according to cell conditions such as oxidative stress, nutritional status and treatment with drugs that inhibit translation.

Inhibition of Hepatitis C Virus Genotype 1a Non-Structural Proteins by Small Interference RNA in Human Hepatoma Cell Lines

Hepatitis C virus (HCV) infection and associated liver diseases are still challenging and represent a significant health care burden around the world. Although, the treatment strategies have been improved by the development of novel direct-acting antivirals, but such therapeutic options are still expensive and beyond the financial range of the most infected individuals in developing or even in resource replete countries. It demands an urgent need to search novel and improved alternate treatment strategies to treat the infection. The present study was aimed to develop an in vitro stable cell culture system, persistently expressing HCV genotype 1a non-structural genes and to characterize the inhibitory effects of synthetic siRNAs (short interference RNA) directed against the most conserved regions of nonstructural genes in an in vitro cell culture model. The continuous expression of nonstructural genes for more than 30 days post transfection was detected by reverse transcription polymerase chain reaction (RT-PCR) and Western blot analysis in stable human hepatoma cell line (Huh-7). The gene expression studies revealed significantly reduced gene expression of HCV nonstructural genes (i.e., NS2, NS4A and NS5A) both at mRNA and protein levels when treated against genome specific synthetic siRNAs in stable cell lines (51%, 47% and 54% respectively, p < 0.05). Similarly, a vivid decrease in HCV viral titer was exhibited by synthetic siRNAs in an in vitro viral replicate cell culture model (58%, 48% and 50%, respectively, p < 0.05) determined by quantitative Real-Time PCR (qPCR). Our data indicate that siRNA mediated gene silencing may be considered a promising alternate treatment strategy against HCV in combination with other effective therapeutic regimens in future.

KRT18与mRNA及长链非编码RNA互作调控椎间盘髓核细胞损伤的机制

背景:椎间盘中差异表达的RNA结合蛋白在椎间盘退变中发挥着关键作用,其中RNA结合蛋白KRT18水平的降低与椎间盘退行性病变相关,但其在椎间盘髓核细胞中的具体作用尚未完全确定。目的:探讨KRT18与mRNA及长链非编码RNA结合互作对椎间盘髓核细胞的影响及机制。方法:对因腰部骨折或椎间盘退行性病变而接受椎间融合术的患者进行人体髓核组织取样获得正常髓核细胞和退变髓核细胞,并进行iRIP-seq、功能富集分析以及DNA微阵列分析,随后根据分析结果在髓核细胞中敲低KRT18,通过蛋白免疫印迹及qRt-PCR在蛋白和RNA水平检测相关基因水平的表达。结果与结论:通过iRIP-seq分析发现GUAAUC和AGCCUC序列中存在大量的KRT18结合位点,表明KRT18可参与调控RNA的转录、翻译、稳定性或在细胞信号传导途径中发挥作用。其能够与成熟的mRNA稳定结合,其中表达较高的基因包括CRLF1及IGFBP4等,同时与其结合的长链非编码RNA的峰值基因包括SNHG25、SNHG12、NEAT1、USP32、EIF4A2和CDH4,这些基因多涉及细胞凋亡、炎症等多种生物过程,并且能介导细胞外基质代谢的相关通路,KRT18能够调控它们的稳定性、转运、翻译、剪接等多个方面的功能,进而影响基因的表达和细胞功能。实验结果验证了在髓核细胞中敲低KRT18,细胞外基质代谢水平被抑制出现失衡,导致体外椎间盘退变。该研究首次从KRT18与mRNA及长链非编码RNA结合的角度探讨其调控机制,并推测了KRT18在椎间盘退变发病机制中的潜在功能,为今后KRT18关键功能的研究奠定了基础。

Regulation of RNA binding proteins in trypanosomatid protozoan parasites

Posttranscriptional mechanisms have a critical role in the overall outcome of gene expression. These mechanisms are especially relevant in protozoa from the genus Trypanosoma, which is composed by death threatening parasites affecting people in Sub-saharan Africa or in the Americas. In these parasites the classic view of regulation of transcription initiation to modulate the products of a given gene cannot be applied. This is due to the presence of transcription start sites that give rise to long polycistronic units that need to be processed costranscriptionally by trans-splicing and polyadenylation to give mature monocistronic mRNAs. Posttranscriptional mechanisms such as mRNA degradation and translational repression are responsible for the final synthesis of the required protein products. In this context, RNA-binding proteins(RBPs) in trypanosomes have a relevant role as modulators of mRNA abundance and translational repression by associating to the 3' untranslated regions in mRNA. Many different RBPs have been proposed to modulate cohorts of mRNAs in trypanosomes. However, the current understanding of their functions lacks a dynamic view on the different steps at which these RBPs are regulated. Here, we discuss different evidences to propose regulatory events for different RBPs in these parasites. These events vary from regulated developmental expression, to biogenesis of cytoplasmic ribonucleoprotein complexes in the nucleus, and condensation of RBPs and mRNA into large cytoplasmic granules. Finally, we discuss how newly identified posttranslational modifications of RBPs and mRNA metabolism-related proteins could have an enormous impact on the modulation of m RNA abundance. To understand these modifications is especially relevant in these parasites due to the fact that the enzymes involved could be interesting targets for drug therapy.

Modified One Step Isolation of RNA,DNA and Protein from Plant Tissues

[Objective] The aim of this study was to extract RNA,DNA and protein from plants by using modified one step method.[Method]CTAB was used for the modifying of Biozol-based one step extraction method,which was then used for the isolation of RNA,DNA and protein from the roots of maize（Zea mays L.）,soybean（Glycine max L.）,alfalfa（Medicago sativa L.）and cucumber（Cucumis sativus L.）.And the heme oxygenase-1 gene（HO-1）and calcium-dependent protein kinase-1 gene（CDPK1）,as well as HO-1 protein were identified.[Result]The result of UV spectrophotometer determination and agarose gel electrophoresis analysis showed that the purity of obtained RNA and DNA sample was relatively high;HO-1 and CDPK1 gene exhibited the positive signals checked by RT-PCR;the extracted protein could be used for western blotting analysis;the whole isolation procedure cost 3 h.[Conclusion]This method can be used as a good reference for researcher and will offer a better value with a wide range of applications.

LncRNA ZEB1-AS1和LncRNA SOX2OT在糖尿病肾病患者中的表达及与肾功能的相关性研究

目的探究长链非编码RNA锌指E盒结合同源盒蛋白1反义链1(LncRNA ZEB1-AS1)和长链非编码RNA性别决定相关基因簇2重叠转录本(LncRNA SOX2OT)在糖尿病肾病(DN)患者中的表达及与肾功能的相关性。方法选取于2021年11月—2023年12月在武汉大学人民医院肾内科收治的DN患者106例为DN组,并根据24 h尿蛋白定量(24 h Upro)水平分为正常蛋白尿亚组43例(<30 mg)、微量蛋白尿亚组39例(30~<300 mg)、大量蛋白尿亚组24例(≥300 mg),另选取同期医院单纯糖尿病患者106例作对照组,检测患者血清LncRNA ZEB1-AS1、LncRNA SOX2OT水平;Pearson法分析LncRNA ZEB1-AS1和LncRNA SOX2OT与肾功能指标的相关性;Logistic分析影响DN患者肾功能损伤的因素。结果DN组血清LncRNA ZEB1-AS1、LncRNA SOX2OT水平低于对照组(t=11.471、10.257,P均<0.001)。血清LncRNA ZEB1-AS1、LncRNA SOX2OT比较,正常尿蛋白亚组>微量尿蛋白亚组>大量尿蛋白亚组(F=58.720、117.722,P均<0.001),BUN、SCr、UA水平比较,正常尿蛋白亚组<微量尿蛋白亚组<大量尿蛋白亚组,差异均有统计学意义(F=122.493、595.589、53.178,P均<0.001);LncRNA ZEB1-AS1、LncRNA SOX2OT分别与BUN、SCr、UA呈负相关(r=-0.487、-0.498、-0.521,-0.527、-0.515、-0.534,P均<0.001);Logistic回归分析显示,糖尿病病程长及高BUN、SCr、UA水平是影响DN患者肾功能损伤的危险因素[OR(95%CI)=1.672(1.128~2.479)、2.839(1.534~5.253)、2.754(1.512~5.017)、2.693(1.464~4.954)],高LncRNA ZEB1-AS1、LncRNA SOX2OT是保护因素[OR(95%CI)=0.875(0.798~0.959)、0.898(0.832~0.969)]。结论血清LncRNA ZEB1-AS1、LncRNA SOX2OT水平与DN患者肾功能有关,可能是评估DN患者肾功能的潜在指标。

RNA结合蛋白ELAVL1的功能及其调控病毒复制的研究进展

胚胎致死异常视觉蛋白1(embryonic lethal abnormal vision like 1, ELAVL1),又被称为人类抗原R(human antigen R, HuR),是一种典型的RNA结合蛋白(RNA binding protein, RBP),通过与3′非翻译区(3′untranslated element, 3′UTR)的AU富含元件(AU-rich element, ARE)结合,在mRNA转录和翻译过程中发挥重要作用。ELAVL1的作用十分广泛,可调控肿瘤的发生发展、凋亡、迁移与侵袭,是许多癌症治疗的关键靶点,还能参与调节编码器官发育和组织稳态的蛋白质和mRNA的水平,也有许多研究表明,ELAVL1通过转录后调控和翻译后修饰来调节病毒复制。本文主要综述了ELAVL1的生物学特点、功能、调控机制及其在病毒复制过程中的调控作用,旨在为进一步研究ELAVL1与畜禽病毒复制之间互作的机制提供理论参考。

抑制lncRNA TUG1下调核苷酸结合寡聚结构域样受体蛋白1炎症小体在延缓阿尔茨海默病进展的作用

目的探讨敲低长链非编码RNA(lncRNA)牛磺酸上调基因1(TUG1)抑制核苷酸结合寡聚结构域样受体蛋白1(NLRP1)炎症小体在缓解阿尔茨海默病进展中的作用。方法选取9~10周龄遗传背景为C57/BL6的野生型小鼠(WT组,10只)或淀粉样前体蛋白(APP)/早老素1(PS1)转基因小鼠(30只)。APP/PS1转基因小鼠随机分为模型(model)组,模型+敲低lncRNA TUG1组[model+lncRNA TUG1短发夹RNA(shRNA)组]和model+shRNA非靶标(NT)组,每组10只。分别采集12周龄第1天(3月龄)和32周龄第1天(8月龄)小鼠外周血和脑皮质组织,并分离皮质中的原代小胶质细胞和原代星形胶质细胞,每个时间点每组5只小鼠。Real-time PCR分别测定3月龄和8月龄上述4个分组小鼠脑皮质组织和原代小胶质细胞中lncRNA TUG1和巨噬细胞移动抑制因子(MIF)mRNA的水平,以及原代星形胶质细胞中补体蛋白C1r和C1s mRNA的水平。ELISA法测定其外周血浆中MIF含量。对3月龄和8月龄小鼠脑皮质原代小胶质细胞和原代星形胶质细胞共培养。CCK-8法测定上述2种细胞的增殖能力。Western blotting分别测定3月龄和8月龄上述4个分组小鼠脑皮质组织中MIF、白细胞介素1β前体(pro-IL-1β)、凋亡相关斑点样蛋白(ASC)、Caspase-1(p20)、Caspase-1(full)、NLRP1及NLRP3蛋白的表达水平。采用免疫荧光染色法测定8月龄各分组小鼠脑皮质组织中β淀粉样蛋白(Aβ)表达。结果3月龄和8月龄时,与WT组小鼠相比,model组小鼠脑皮质组织和原代小胶质细胞中lncRNA TUG1和MIF相对表达水平显著上调,原代小胶质细胞和原代星形胶质细胞增殖能力增强(P<0.05)。与model组相比,model+lncRNA TUG1 shRNA组小鼠脑皮质组织和原代小胶质细胞中lncRNA TUG1和MIF的相对表达水平显著降低,原代小胶质细胞和原代星形胶质细胞增殖能力降低(P<0.05)。与WT组相比,model组小鼠外周血浆中MIF含量显著升高;小鼠脑皮质组织中pro-IL-1β、ASC、Caspase-1(p20)、Caspase-1(full)、NLRP1以及NLRP3的蛋白表达水平显著升高;Aβ免疫荧光强度明显增强(P<0.05)。与model组相比,model+lncRNA TUG1 shRNA组小鼠外周血浆中MIF含量显著降低;小鼠脑皮质组织中pro-IL-1β、ASC、Caspase-1(p20)、Caspase-1(full)和NLRP1的蛋白表达水平显著降低,Aβ免疫荧光强度明显降低(P<0.05),而NLRP3蛋白质的表达水平无明显变化(P>0.05)。与model组相比,model+shRNA NT组小鼠上述所有检测指标差异均无显著性(P>0.05)。结论APP/PS1转基因小鼠脑皮质组织和原代小胶质细胞中lncRNA TUG1和MIF因子表达上调与脑皮质内NLRP1炎症小体激活成正相关,敲低lncRNA TUG1可缓解阿尔茨海默病的进展。

RNA结合蛋白RBM45在肝癌中的表达及其临床意义

目的探讨核糖核酸结合基序蛋白45(RNA-binding motif protein 45,RBM45)在肝癌中的表达及其临床应用价值。方法应用癌症基因组图谱(The Cancer Genome Atlas,TCGA)数据库分析RNA结合蛋白RBM45在肝癌中的表达,并关联临床资料及病理特征进行统计学分析。运用基因富集分析软件GSEA对肝癌组织中与RBM45相关的基因进行KEGG信号通路富集分析。结果与癌旁组织相比,肝癌组织中RBM45表达明显升高(P<0.001),且RBM45表达水平与患者临床分期、肿瘤分级及预后均显著相关(P<0.05),通过构建单变量和多变量COX风险回归模型分析RBM45表达与临床资料的相关性,结果表明RBM45可做为肝癌患者独立预后的危险因素(HR:2.75695%CI:1.785-4.255,P=4.813e-06);KEGG富集分析显示,RBM45可能与细胞周期、卵母细胞减数分裂、泛素介导的蛋白水解等信号通路密切相关。结论RBM45在肝癌组织中高表达,且其高表达的患者预后较差;RBM45表达可作为肝癌患者预后判断的独立标志物。

环状RNA同源性蛋白激酶3靶向微RNA-338促进胶质瘤细胞侵袭、迁移的实验研究

目的探讨人血清环状RNA同源性蛋白激酶3(CircHIPK3)靶向微RNA-338(miR-338)对胶质瘤细胞U251细胞侵袭、迁移的影响。方法2021年2-12月,在武汉大学人民医院科研中心将U251细胞分为空白(NG)组、CircHIPK3阴性对照(shcontrol)组、HIPK3敲减(sh-CircHIPK3)组,实时荧光定量PCR(qRT-PCR)检测U251细胞中CircHIPK3、miR-338表达水平;Transwell检测细胞迁移与侵袭;划痕法检测细胞迁移;流式细胞术检测细胞周期;通过Circular RNA Interactome、RegRNA2.0、CircBank Database网站预测CircHIPK3(ID:hsa_circ_0000284)的靶向miRNA并用双萤光素酶实验验证,蛋白质印迹法检测基质金属蛋白酶(MMP)-2、MMP-9蛋白表达。结果与NG组、sh-control组比较,sh-CircHIPK3组中CircHIPK3(1.00±0.00、1.06±0.26比0.56±0.06)表达水平显著降低(P<0.05),miR-338(1.00±0.00、1.12±0.19比1.89±0.28)表达、G1期细胞比例[(58.72±0.36)%、(58.45±0.27)%比(64.72±0.47)%]升高(P<0.05),U251细胞侵袭数目[(164.89±12.55)个、(165.77±12.16)个比(80.13±11.37)个]、划痕愈合率[(25.66±2.37)%、(26.38±2.53)%比(10.36±1.53)%]、迁移细胞数目[(196.72±18.75)个、(194.65±17.86)个比(95.58±8.66)个]、S期细胞比例[(26.45±0.39)%、(26.57±0.41)%比(20.72±0.18)%]明显降低(P<0.05);miR-338是CircHIPK3的靶基因。与NG组、sh-control组比较,sh-CircHIPK3组MMP-2(1.31±0.23、1.33±0.20比0.61±0.05)、MMP-9(1.16±0.22、1.15±0.21比0.85±0.19)蛋白表达水平均显著降低(P<0.05)。结论沉默CircHIPK3通过靶向上调miR-338表达能抑制胶质瘤细胞U251细胞迁移和侵袭。

LncRNA p21调控Hippo-YAP信号通路对小鼠腹主动脉瘤形成的影响及机制

目的 探究长链非编码RNA p21(long non-coding RNA,LncRNA p21)调控Hippo-Yes相关蛋白(Hippo-Yes-associated protein, Hippo-YAP)信号通路对小鼠腹主动脉瘤(abdominal aortic aneurysm, AAA)形成的影响。方法 C57BL/6 ApoE-/-通过皮下植入渗透性微泵构建血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)诱导小鼠AAA模型。将C57BL/6 ApoE-/-随机分为假手术组(sham)、模型组(model)、LncRNA p21阴性对照组(sh-NC)、LncRNA p21敲低组(sh-LncRNA p21)。HE和血管弹力纤维染色(VVG)观察血管形态变化;qRT-PCR检测LncRNA p21表达;Western blot检测MMP-2、MMP-9、TIMP-1表达;原位末端标记法(TUNEL)染色检测平滑肌细胞凋亡;Western blot检测caspase-3、cyclinD1及Hippo-YAP信号通路蛋白表达。结果 与sham组相比,model组小鼠血管弹力纤维断裂紊乱,出现明显损伤,且LncRNA p21、MMP-2、MMP-9、caspase-3表达和细胞凋亡率均增加(P<0.01),TIMP-1、cyclinD1和YAP、TAZ表达均降低(P<0.01)。与model组相比,sh-LncRNA p21组小鼠血管弹力纤维断裂及损伤程度减轻,LncRNA p21、MMP-2、MMP-9、caspase-3表达和细胞凋亡率均降低(P<0.01),TIMP-1、cyclinD1和YAP、TAZ表达均增加(P<0.01)。结论 LncRNA p21能够促进小鼠AAA形成,其机制与调控Hippo-YAP信号、促进细胞凋亡、抑制细胞增殖相关。

血清长链非编码RNA肌动蛋白纤维相关蛋白1-反义RNA1水平与钙化性主动脉瓣狭窄病人左心室功能的相关性研究

目的 分析血清长链非编码RNA(lncRNA)肌动蛋白纤维相关蛋白1-反义RNA1(AFAP1-AS1)表达水平与钙化性主动脉瓣狭窄(CAS)病人左心室收缩及舒张功能的相关性。方法 于2020年1月至2021年12月,选取中国中医科学院广安门医院就诊的CAS病人129例作为CAS组[左心室射血分数(LVEF)≥50%],同期该院健康志愿者130例作为对照组。收集病人人口学资料、超声及实验室生化指标,检测血清lncRNA AFAP1-AS1表达。受试者操作特征曲线(ROC曲线)分析血清lncRNA AFAP1-AS1诊断CAS效能。结果 对照组血清lncRNA AFAP1-AS1表达水平(1.15±0.18)低于CAS组(1.58±0.30)(P<0.001)。轻度狭窄者血清lncRNA AFAP1-AS1表达水平(1.37±0.26)低于中、重度狭窄者,而中度狭窄者lncRNA AFAP1-AS1表达水平(1.59±0.30)低于重度狭窄者(1.79±0.34)(P<0.001)。ROC结果显示,血清lncRNA AFAP1-AS1诊断CAS、重度狭窄的曲线下面积分别为0.86[95%CI:(0.82,0.91)]、0.88[95%CI:(0.82,0.94)]。CAS组AVA水平低于对照组(P<0.001),左室舒张末期内径(LVEDD)、左室舒张末期容积(LVEDV)、室间隔厚度(IVST)、左室后壁厚度(LVPWT)、左房前后径(LAD)、主动脉瓣平均压差(PGmean)、主动脉瓣峰值流速(Vmax)水平高于对照组(均P<0.001)。相关性分析显示,血清lncRNA AFAP1-AS1与LVEDD、Vmax、二尖瓣口舒张早期血流速度峰值(E峰)、二尖瓣口舒张晚期血流速度峰值(A峰)、LVEDV、PGmean、LVESD呈正相关(r=0.60、0.66、0.72、0.68、0.56、0.57、0.50,均P<0.001),与LVEF、AVA呈负相关(r=-0.78、-0.62,均P<0.001)。结论 CAS病人血清lncRNA AFAP1-AS1表达水平升高,与CAS病情严重程度以及左心室舒张、收缩功能有关,并可作为无创血清标志物辅助临床诊断CAS。

长链非编码RNA LINC00996通过抑制CDKN2A促进胃癌进展

背景长链非编码RNA长基因间非蛋白编码RNA 996(long intergenic non-protein coding RNA 996,LINC00996)在多种肿瘤中发挥促癌或抑癌作用,而其在胃癌中的表达和作用尚不清楚.目的探索LINC00996在胃癌组织和细胞系中的表达,并探讨其对胃癌细胞生物学行为的作用及机制.方法用生物信息学法分析胃癌中LINC00996的表达,及其对胃癌患者总生存期的影响.用RT-qPCR检测胃癌及癌旁组织、胃癌及正常胃上皮细胞系中LINC00996表达.胃癌细胞(SGC7901、NCI-N87)转染针对LINC00996的小干扰RNA(si-LINC00996)和细胞周期蛋白依赖性激酶抑制蛋白2A(cyclin-dependent kinase inhibitor 2A,CDKN2A)的小干扰RNA(si-CDKN2A)后,用细胞计数试剂盒-8法、EDU染色法、流式细胞术法、划痕法和Transwell法分别检测细胞增殖、细胞周期、凋亡、迁移与侵袭;Western blot法检测细胞中CDKN2A、周期蛋白D1、B淋巴细胞瘤-2(B-cell lymphoma-2,Bcl-2)、Bcl-2相关X蛋白(Bcl-2 associated X protein,Bax)和劈开的半胱胺酸蛋白酶-3(Cleaved cysteinyl aspartate-specific proteinase-3,Cleaved caspase-3)表达.结果LINC00996在胃癌组织和细胞中表达较癌旁组织和胃正常细胞系显著升高(P<0.05),Kaplan Meier Plotter数据库显示LINC00996高表达组的胃癌患者的总生存期较低表达组显著缩短(P<0.05).敲降LINC00996能抑制胃癌细胞增殖、细胞周期运行、迁移、侵袭(P<0.05),促进细胞凋亡(P<0.05);降低cyclin D1和Bcl-2表达(P<0.05);升高CDKN2A、Bax和Cleaved caspase-3表达(P<0.05).敲降CDKN2A能部分逆转敲降LINC00996对胃癌细胞的作用(P<0.05).结论敲降LINC00996能通过上调CDKN2A诱导胃癌细胞凋亡,抑制其增殖、迁移与侵袭.

环状RNA UBAP2在结直肠癌中的表达及临床意义分析

目的:分析环状RNA泛素关联蛋白2(UBAP2)在结直肠癌中的表达及临床意义。方法:选取2021年1月—2023年1月江阴市中医院收治的疑似结肠直肠癌患者30例作为疑似组,选取同期健康体检者30例作为健康组。比较两组环状RNA UBAP2表水平,以病理检查结果为“金标准”,计算环状RNA UBAP2对结直肠癌的诊断效能。结果:疑似组环状RNA UBAP2水平高于健康组,差异有统计学意义(P<0.001)。环状RNA UBAP2诊断结直肠癌的灵敏度为95.65%(22/23)、特异度为14.29%(1/7)、准确度为82.14%(23/28)、阳性预测值为78.57%(22/28)、阴性预测值为50.00%(1/2)。结论:环状RNA UBAP2在结直肠癌患者中的表达水平较高,诊断结直肠癌的灵敏度、准确度较高,可为临床诊断提供参考依据。

lncRNA CYTOR靶向miR-139-5p对三阴性乳腺癌细胞增殖的影响及其机制

目的探讨长链非编码RNA(lncRNA)细胞骨架调节因子RNA(CYTOR)靶向微小RNA-139-5p(miR-139-5p)对三阴性乳腺癌细胞增殖的影响及其机制。方法体外传代培养三阴性乳腺癌细胞株HCC1806,取传3代、对数生长期、生长状态良好的细胞进行后续实验。通过starBase数据库预测lncRNA CYTOR与miR-139-5p的结合位点,通过双荧光素酶报告基因实验验证lncRNA CYTOR与miR-139-5p的靶向关系。取HCC1806细胞,随机分为空白对照组、阴性对照组、lncRNA CYTOR沉默组、miR-139-5p过表达组、lncRNA CYTOR沉默+miR-139-5p过表达组。阴性对照组、lncRNA CYTOR沉默组、miR-139-5p过表达组、lncRNA CYTOR沉默+miR-139-5p过表达组分别转染NC mimics、lncRNA CYTOR siRNA、miR-139-5p mimics、lncRNA CYTOR siRNA+miR-139-5p mimics,转染48 h更换新鲜培养基,继续培养24 h。空白对照组常规培养,不予转染。收集各组上述细胞,采用RT-qPCR法检测miR-139-5p、性别决定区Y框蛋白8(SOX8)mRNA表达,采用EdU法检测细胞增殖能力,采用Western blotting法检测ATP结合盒转运蛋白G2(ABCG2)、SOX8表达。结果经starBase数据库预测,lncRNA CYTOR与miR-139-5p存在结合位点;经双荧光素酶报告基因实验验证,lncRNA CYTOR与miR-139-5p存在靶向调控关系。lncRNA CYTOR沉默组、miR-139-5p过表达组、lncRNA CYTOR沉默+miR-139-5p过表达组miR-139-5p相对表达量均高于空白对照组和阴性对照组,SOX8 mRNA相对表达量、EdU阳性细胞比例以及ABCG2、SOX8蛋白相对表达量均低于空白对照组和阴性对照组(P均<0.05);lncRNA CYTOR沉默+miR-139-5p过表达组miR-139-5p相对表达量高于lncRNA CYTOR沉默组和miR-139-5p过表达组,SOX8 mRNA相对表达量、EdU阳性细胞比例以及ABCG2、SOX8蛋白相对表达量均低于lncRNA CYTOR沉默组和miR-139-5p过表达组(P均<0.05);而空白对照组与阴性对照组、lncRNA CYTOR沉默组与miR-139-5p过表达组miR-139-5p、SOX8 mRNA相对表达量以及EdU阳性细胞比例和ABCG2、SOX8蛋白相对表达量比较差异均无统计学意义(P均>0.05)。结论lncRNA CYTOR可通过靶向miR-139-5p调控ABCG2和SOX8表达,从而促进三阴性乳腺癌细胞增殖。