Understanding the interaction of hepatitis C virus with host DEAD-box RNA helicases

The current therapeutic regimen to combat chronic hepatitis C is not optimal due to substantial side effects and the failure of a significant proportion of patients to achieve a sustained virological response. Recently developed direct-acting antivirals targeting hepatitis C virus (HCV) enzymes reportedly increase the virologic response to therapy but may lead to a selection of drug-resistant variants. Besides direct-acting antivirals, another promising class of HCV drugs in development include host targeting agents that are responsible for interfering with the host factors crucial for the viral life cycle. A family of host proteins known as DEAD-box RNA helicases, characterized by nine conserved motifs, is known to play an important role in RNA metabolism. Several members of this family such as DDX3, DDX5 and DDX6 have been shown to play a role in HCV replication and this review will summarize our current knowledge on their interaction with HCV. As chronic hepatitis C is one of the leading causes of hepatocellular carcinoma, the involvement of DEAD-box RNA helicases in the development of HCC will also be highlighted. Continuing research on the interaction of host DEAD-box proteins with HCV and the contribution to viral replication and pathogenesis could be the panacea for the development of novel therapeutics against HCV.

Identification of the DEAD-box RNA helicase family members in grapevine reveals that VviDEADRH25a confers tolerance to drought stress

Grapevine growing areas are increasingly affected by drought,which has greatly limited global wine production and quality.DEAD-box is one of the largest subfamilies of the RNA helicase family,and its members play key roles in the growth and development of plants and their stress responses.Previous studies have shown the potential of DEAD-box genes in the drought stress responses of Arabidopsis and tomato,rice,and other crop species.However,information about DEAD-box genes in grapevine remains limited.In this report,a total of 40 DEAD-box genes were identified in grapevine and their protein sequence characteristics and gene structures were analyzed.By comparing the expression profiles of VviDEADRHs in response to drought stress in different grapevine varieties,nine candidate genes(VviDEADRH10c,-13,-22,-25a,-25b,-33,-34,-36,and-39)were screened based on expression profiling data.Combined with qRTPCR results,Vvi DEADRH25a was selected for functional verification.Heterologous overexpression of Vvi DEADRH25a in Arabidopsis showed the transgenic plants were more sensitive to drought stress than the control.Both electrolyte permeability and malondialdehyde content were significantly increased in transgenic plants,whereas the chlorophyll content and superoxide dismutase(SOD),peroxidase(POD),catalase(CAT),and ascorbate peroxidase(APX)enzyme activities were significantly decreased.Furthermore,VviDEADRH25a-overexpressing plants showed down-regulated expression levels of several drought stress-related marker genes,namely At COR15a,At RD29A,At ERD15,and At P5CS1,which indicated that they participated in the drought stress response.In summary,this study provides new insights into the structure,evolution,and participation of DEAD-box RNA helicase genes in the response to drought stress in grapevines.

CHD1L在恶性肿瘤中的作用与机制研究进展

恶性肿瘤的发生发展与细胞增殖、凋亡或其他生物学过程中关键的癌症相关基因密切相关。染色质结构域解旋酶/ATP酶DNA结合蛋白1样基因(CHD1L)是一种新发现位于Chr1q21的致癌基因。CHD1L在许多人类正常组织中均有表达,且在肝癌、结直肠癌、胃癌、卵巢癌和神经胶质瘤等多种人类恶性肿瘤组织中高表达。CHD1L作为恶性肿瘤发生发展的促进因子,影响肿瘤细胞的增殖、迁移、侵袭、凋亡和自噬等生物学过程,且其高表达与恶性肿瘤的不良预后密切相关。CHD1L在转录调控、维持染色体完整性和DNA修复中也发挥着重要作用。本文就CHD1L在恶性肿瘤中的作用及其机制研究进展进行综述,以期为CHD1L成为恶性肿瘤潜在标志物和临床治疗的新靶点提供参考。

番茄DEAD-box RNA解旋酶基因SlDEAH1的克隆及表达分析

DEAD-box RNA解旋酶是一种特殊的RNA分子伴侣,参与了RNA代谢,包括前体RNA剪接、核糖体合成、RNA降解以及基因表达,并对植物的发育和抗性等也具有重要作用。根据已报道的拟南芥DEAD-box蛋白,通过同源比对,在NCBI据库中筛选得到一个DEAD-box RNA解旋酶同源蛋白,命名为SlDEAH1,并根据其基因序列设计特异引物,应用RT-PCR方法从野生型番茄(Solanum lycopersicum)AC++中克隆得到了该基因的全长编码区序列。利用生物学网站、软件及实时荧光定量PCR方法,对其进行生物信息学、表达模式、胁迫及激素处理分析。结果表明:SlDEAH1包括2 073 bp的开放阅读框,编码690个氨基酸残基,其编码蛋白有9个保守结构基序,其所涉及到的ATP结合、ATP水解及RNA结合等功能对于解旋酶活性是至关重要的;表达模式分析表明SlDEAH1基因可能在野生型番茄萼片、叶片发育及果实成熟方面起到重要作用;高温、低温、脱水、伤害、盐胁迫不同程度的诱导了SlDEAH1的表达,但在根中该基因的表达受盐胁迫抑制;ABA、ACC、IAA、GA3、MeJA和ZT均不同程度诱导了SlDEAH1的表达,其中ABA诱导效应最为明显。这些结果为进一步研究SlDEAH1在番茄发育和胁迫响应中的功能奠定了基础。

DEAD-box RNA解旋酶5和转录因子12与肌萎缩侧索硬化症的关系

目的通过检测DEAD-box RNA解旋酶5(DDX5)和转录因子12(TCF12)在SOD1-G93A突变型肌萎缩侧索硬化症(ALS)转基因小鼠海马中表达情况及其相互作用关系,揭示DDX5和TCF12表达改变与ALS海马病变的关系。方法将42对SOD1-G93A突变型ALS转基因小鼠和野生型小鼠,按照95 d龄(发病早期)、108 d龄(发病中期)和122 d龄(发病晚期)分为3组,通过RT-PCR、Western blotting和免疫荧光双标记技术,检测DDX5和TCF12在海马中的表达情况,通过免疫共沉淀技术检测DDX5和TCF12蛋白之间是否具有相互作用。结果与同龄野生型小鼠相比,在SOD1-G93A突变型ALS转基因小鼠海马中DDX5和TCF12 m RNA无明显变化,而蛋白在95 d、108 d和122 d表达均上调,差异均有统计学意义。海马齿状回和海马本部均可见DDX5和TCF12阳性细胞,且DDX5和TCF12在海马神经元中表达。SOD1-G93A突变型ALS转基因小鼠海马中DDX5和TCF12免疫阳性反应均较同龄野生型小鼠增强。免疫共沉淀实验检测发现,DDX5和TCF12蛋白质之间存在相互作用。结论DDX5和TCF12蛋白在SOD1-G93A突变型ALS转基因小鼠海马组织中表达上调,DDX5和TCF12表达异常与ALS海马组织病变有关。

Post-transcriptional regulation of DEAD-box RNA helicases in hematopoietic malignancies

Hematopoiesis represents a meticulously regulated and dynamic biological process.Genetic aberrations affecting blood cells,induced by various factors,frequently give rise to hematological tumors.These instances are often accompanied by a multitude of abnormal post-transcriptional regulatory events,including RNA alternative splicing,RNA localization,RNA degradation,and storage.Notably,post-transcriptional regulation plays a pivotal role in preserving hematopoietic homeostasis.The DEAD-Box RNA helicase genes emerge as crucial post-transcriptional regulatory factors,intricately involved in sustaining normal hematopoiesis through diverse mechanisms such as RNA alternative splicing,RNA modification,and ribosome assembly.This review consolidates the existing knowledge on the role of DEAD-box RNA helicases in regulating normal hematopoiesis and underscores the pathogenicity of mutant DEADBox RNA helicases in malignant hematopoiesis.Emphasis is placed on elucidating both the positive and negative contributions of DEAD-box RNA helicases within the hematopoietic system.

Long non-coding RNA DPP10-AS1 represses the proliferation and invasiveness of glioblastoma by regulating miR-24-3p/CHD5 signaling pathway

This investigation aimed to unveil new prospective diagnosis-related biomarkers together with treatment targets against glioblastoma.Methods:The expression levels of long non-coding RNA(lncRNA)DPP10-AS1 were assessed using real-time quantitative polymerase chain reaction(RT-qPCR)within both the patient tissue specimens and glioblastoma cell lines.The relationship between lncRNA DPP10-AS1 expression in glioblastoma and patient prognosis was investigated.Cell Counting Kit-8(CCK-8),transwell,and clonogenic experiments were utilized to assess tumor cells’proliferation,invasiveness,and migratory potentials after lncRNA DPP10-AS1 expression was up or down-regulated.Using an online bioinformatics prediction tool,the intracellular localization of lncRNA DPP10-AS1 and its target miRNA were predicted,and RNA-FISH verified results.A dual-luciferase reporter experiment validated the relationship across miR-24-3p together with lncRNA DPP10-AS1.MiR-24-3p expression within glioblastoma was identified through RT-qPCR,and potential link across miR-24-3p and lncRNA DPP10-AS1 was assessed using Pearson correlation analysis.Moreover,influence from lncRNA DPP10-AS1/miR-24-3p axis upon glioblastoma cell progression was assessed in vivo via a subcutaneous xenograft tumor model.Results:The expression of lncRNA DPP10-AS1 was notably reduced in both surgical specimens of glioblastoma and the equivalent cell lines.Low level of lncRNA DPP10-AS1 in glioblastoma is following poor prognosis.The downregulation of lncRNA DPP10-AS1 in glioblastoma cells resulted in enhanced cellular proliferation,migration,and invasion capabilities,accompanied by downregulated E-cadherin and upregulated vimentin and N-cadherin.Additionally,the observed upregulation of lncRNA DPP10-AS1 demonstrated a substantial inhibitory function upon proliferation,invasion,and migratory capabilities of LN229 cells.Subcellular localization disclosed that lncRNA DPP10-AS1 had a binding site that interacted with miR-24-3p.Upregulated miR-24-3p was detected in glioblastomas,displaying an inverse correlation with lncRNA DPP10-AS1 expression.MiR-24-3p downstream target has been determined as chromodomain helicase DNA binding protein 5(CHD5).LncRNA DPP10-AS1 affected the invasion and proliferation of glioblastoma by controlling the miR-24-3p/CHD5 axis.Conclusion:The present study demonstrated that lncRNA DPP10-AS1 can inhibit the invasive,migratory,and proliferative properties of glioblastoma by regulating the miR-24-3p/CHD5 signaling pathway.Consequently,lncRNA DPP10-AS1 has potential as a tumor suppressor and might be utilized for accurate diagnosis and targeted treatments of glioblastomas.

基于HDA的超级细菌耐药基因NDM-1检测方法的建立

本研究以建立解旋酶DNA恒温扩增(HDA)检测方法为目的,选择三种超级细菌NDM-1基因(metallo-beta-lactamase 1 gene)为目的基因,设计并合成特异性引物,建立和优化了可快速检测该种基因的HDA检测方法。特异性和灵敏度检测结果表明:该方法对NDM-1基因检测具有特异性,最低检测限可达10fg/μL,灵敏度高于普通PCR。提示HDA是一种针对NDM-1的快速、灵敏、便捷的非PCR核酸扩增技术。

嗜热菌PIF1解旋酶的生化活性研究

小整合频率1(petite integration frequency 1,PIF1)解旋酶广泛存在于生物体内,在核酸的代谢过程中发挥着重要作用。近年来,人们已经报道了多种PIF1解旋酶的生化活性及三维结构,但对极端环境下细菌的PIF1解旋酶的报道仍较少。本文利用多种生物化学与生物物理学技术,对黄石热脱硫弧菌PIF1(Ty.PIF1)解旋酶进行了多方面研究。通过原核表达纯化系统,获得了纯度90%以上,均一性好的Ty.PIF1蛋白。Ty.PIF1在溶液中为单体,分子量约为60 kD。Ty.PIF1具有很高的热稳定性,在65℃以下时,二级结构保持稳定,大于70℃时,二级结构才会发生改变。Ty.PIF1在体外最适解旋温度为45℃,并非黄石热脱硫弧菌生存的最适温度,预示着Ty.PIF1在体内发挥活性时,可能需要其他辅助因子的参与。Ty.PIF1的酶活力温度范围较宽,在20~55℃均具有解旋活性,在55℃能解旋预示了Ty.PIF1具有耐热特性。Ty.PIF1偏向于同含有单链的底物结合,但对单链长度有一定要求,其长度至少大于4 nt;Ty.PIF1也会较好地结合无单链尾链的G4结构,说明Ty.PIF1可能有专门结合G4结构的区域。Ty.PIF1能解开一系列带有5′-单链尾链的类似于复制中间体的底物,且对底物结构有一定的偏好性;Ty.PIF1也可以解开含有G4结构的底物,DNA-RNA杂交链、RNA-loop结构,预示着Ty.PIF1在生物体内有着多种生物学功能。Ty.PIF1解旋带有不同长度5′-单链尾链的双链底物时,尾链长度越长,解旋速率越快,预示着Ty.PIF1可能与Sc.PIF1一样有着较低的解旋持续性。本文将Ty.PIF1的生化活性与其它物种的PIF1解旋酶进行了比较,找出了其中的共性与差异,加深了人们对嗜热菌PIF1解旋酶的认识,为今后研究其它极端环境微生物的PIF1解旋酶提供了一些思路。

沉默CHD1L对前列腺癌PC3细胞恶性生物学行为的影响及其可能机制

目的:探讨染色质解旋酶DNA结合蛋白1样基因(chromodomain helicase/ATPase DNA binding protein 1-like gene,CHD1L)对前列腺癌细胞侵袭、迁移能力的影响及其可能的作用机制。方法:采用实时荧光定量PCR技术检测前列腺癌细胞株LNCAP、PC3、DU145以及前列腺上皮细胞株RWPE-1中CHD1L mRNA表达水平;转染siRNA干扰前列腺癌PC3细胞CHD1L的表达,并用Transwell侵袭实验和划痕实验分析沉默CHD1L对前列腺癌细胞侵袭和迁移能力的影响;Western blotting检测PC3细胞MMP-9、N-钙黏蛋白和E-钙黏蛋白的表达水平。结果:CHD1L mRNA在前列腺癌细胞中的表达水平明显高于前列腺上皮细胞(P<0.01),其中以前列腺癌PC3细胞的表达水平最高。侵袭实验中,干扰组的穿膜细胞数明显低于阴性对照组和空白对照组[(49.67±6.67)vs(113.67±5.69)和(112.00±12.49)个,P<0.05)。划痕实验中,干扰组48 h伤口愈合率也低于阴性对照组和空白对照组[(21.27±3.27)%vs(48.47±5.72)%和(49.93±3.35)%,P<0.05]。干扰组细胞MMP-9和N-钙黏蛋白表达下调,E-钙黏蛋白表达上调。结论:沉默CHD1L可降低前列腺癌PC3细胞的侵袭迁移能力,该作用可能是通过调控MMP-9和EMT相关蛋白表达实现的。

DEAD-box RNA helicases with special reference to p68:Unwinding their biology,versatility,and therapeutic opportunity in cancer

In the era of advancement,the entire world continues to remain baffled by the increased rate of progression of cancer.There has been an unending search for novel thera-peutic targets and prognostic markers to curb the oncogenic scenario.The DEAD-box RNA he-licases are a large family of proteins characterized by their evolutionary conserved D-E-A-D(Asp-Glu-Ala-Asp)domain and merit consideration in the oncogenic platform.They perform multidimensional functions in RNA metabolism and also in the pathology of cancers.Their bio-logical role ranges from ribosome biogenesis,RNA unwinding,splicing,modification of second-ary and tertiary RNA structures to acting as transcriptional coactivators/repressors of various important oncogenic genes.They also play a crucial role in accelerating oncogenesis by pro-moting cell proliferation and metastasis.DDX5(p68)is one of the archetypal members of this family of proteins and has gained a lot of attention due to its oncogenic attribute.It is found to be overexpressed in major cancer types such as colon,brain,breast,and prostate cancer.It exhibits its multifaceted nature by not only coactivating genes implicated in cancers but also mediating crosstalk across major signaling pathways in cancer.Therefore,in this review,we aim to illustrate a comprehensive overview of DEAD-box RNA helicases especially p68 by focusing on their multifaceted roles in different cancers and the various signaling pathways affected by them.Further,we have also briefly discoursed the therapeutic interventional approaches with the DEAD-box RNA helicases as the pharmacological targets for designing in-hibitors to pave way for cancer therapy.

DDX10对肿瘤增殖凋亡影响的研究进展

DDX10(DEAD-box helicase10)是编码RNA解旋酶的DDX蛋白家族成员之一。该家族成员最早被发现能够参与胚胎形成、精子发生以及细胞分裂和生长,且其家族许多成员与肿瘤发生发展密切相关。DDX10能够通过激活多种转录因子的产生,在核糖体合成、细胞增殖和凋亡等多种生物学过程中发挥着重要作用。多项研究发现,DDX10在卵巢细胞癌、肝细胞癌、急性髓系白血病、骨肉瘤等多种肿瘤组织中表达异常。

染色质解旋酶/ATP酶的DNA结合蛋白1样基因致瘤机制研究进展

染色质解旋酶/ATP酶的DNA结合蛋白1样基因(CHD1L)是一种新近被证实与在许多实体瘤中表达增多的致癌基因,它定位于第1号染色体q21区。CHD1L在肝细胞癌和其他肿瘤中的功能性研究提示,该基因在肿瘤形成过程中可以引起细胞增殖、调节G1/S过渡期并且可以抑制细胞凋亡。CHD1L活化的潜在机制可能是通过结合凋亡蛋白Nur77,或通过上调CHD1L调控的靶基因(如ARHGEF9、SPOCK1或TCTP)受体以激活蛋白激酶B通路,从而干扰细胞死亡程序。CHD1L目前已经被认为是一种新的可独立评价一些实体性肿瘤进展、预后以及生存率的生物标志物。现有的对CHD1L的认识在将来也许可以激励大家进行对一些特定肿瘤的靶向治疗研究。

The DEAD-Box RNA Helicase DDX1 Interacts with the Viral Protein 3D and Inhibits Foot-and-Mouth Disease Virus Replication

Foot-and-mouth disease virus(FMDV)can infect domestic and wild cloven-hoofed animals.The non-structural protein 3D plays an important role in FMDV replication and pathogenesis.However,the interaction partners of 3D,and the effects of those interactions on FMDV replication,remain incompletely elucidated.In the present study,using the yeast two-hybrid system,we identified a porcine cell protein,DEAD-box RNA helicase 1(DDX1),which interacted with FMDV 3D.The DDX1-3D interaction was further confirmed by co-immunoprecipitation experiments and an indirect immunofluorescence assay(IFA)in porcine kidney 15(PK-15)cells.DDX1 was reported to either inhibit or facilitate viral replication and regulate host innate immune responses.However,the roles of DDX1 during FMDV infection remain unclear.Our results revealed that DDX1 inhibited FMDV replication in an ATPase/helicase activity-dependent manner.In addition,DDX1 stimulated IFN-p activation in FMDV-infected cells.Together,our results expand the body of knowledge regarding the role of DDX1 in FMDV infection.

人源RNA解旋酶DDX1的表达、纯化及结构性质研究

RNA解旋酶DEAD-box(DDX)蛋白家族是目前已知的最大解旋酶家族,可以解旋RNA或者解离蛋白RNA复合物;其中DDX1蛋白参与多种细胞功能,在mRNA/rRNA加工及衰减、病毒复制及转录、激素代谢以及肿瘤发生发展等各方面发挥着重要作用.但目前有关DDX1如何识别、结合和解旋RNA,如何在各种生理病理过程中发挥功能的分子基础仍然不清楚,其核心功能区的结构尚未解析.本研究成功地在大肠杆菌中重组表达和纯化了人源DDX1蛋白,获得了全长DDX1及多个不同长度截短体(或结构域)蛋白.结合动态光散射(DLS)分析发现DDX1的N端解旋酶ATP结合区结构稳定,状态均一;C末端结构域可能介导与其他蛋白相互作用,具动态变化并容易聚集.X光小角散射实验表明,溶液中DDX1全长蛋白为单体且构象均一.二级结构预测和三维结构模型构建表明DDX1具有经典的DEAD解旋酶家族特征.

可诱导型敲低PICH的MDA-MB-231细胞系的构建及鉴定

目的:构建稳定表达可诱导型polo样激酶1相关检查点解旋酶(PICH)短发夹RNA(shRNA)的三阴乳腺癌细胞系MDA-MB-231,并通过检测加入诱导剂后细胞的增殖评价敲低效果。方法:设计并合成2条特异靶向PICH的shRNA序列,用分子克隆技术构建pLKO.1-tet-on-shPICH-Puromycin质粒,经菌落PCR及基因测序验证;慢病毒包装并感染细胞,通过抗性筛选获得嘌呤霉素抗性的细胞;经强力霉素(DOX)诱导表达后,Western印迹检测PICH的敲低效果,并通过MTT法对细胞增殖进行检测。结果:菌落PCR凝胶电泳及DNA测序结果显示pLKO.1-tet-on-shPICHPuromycin质粒构建成功;Western印迹结果表明,在DOX诱导下,MDA-MB-231细胞中的PICH蛋白质表达下降,表明可诱导型PICH稳定敲低细胞系构建成功;进一步实验结果显示,MDA-MB-231细胞的增殖随PICH的表达下调而受到显著抑制。结论:构建了可诱导稳定敲低PICH的三阴乳腺癌细胞系MDA-MB-231,为进一步研究PICH在三阴乳腺癌中的作用以及具体的分子机制奠定了实验基础。

BRIP1在胶质瘤中的表达及临床意义

目的探讨乳腺癌易感基因相互作用蛋白1(BRIP1)在胶质瘤中的表达及其与病人预后的相关性。方法从GEO数据库GPL570平台选取三个BRIP1基因表达谱芯片(GSE4290、GSE50161和GSE74195)分析胶质瘤BRIP1的表达情况。使用TC⁃GA下载有关胶质瘤BRIP1表达、生存率和临床特征的数据,多因素Cox比例回归风险模型分析胶质瘤生存预后的影响因素;利用受试者工作特征(ROC)曲线评估BRIP1表达水平与胶质瘤生存预后的关系;通过基因富集分析胶质瘤BRIP1相关的细胞信号通路。结果胶质瘤BRIP1表达水平相比于正常样本明显升高(P<0.05)。多因素Cox回归分析结果表明,BRIP1高表达(HR=1.250;95%CI:1.056~1.480;P<0.001)是胶质瘤不良预后的独立危险因素。生存曲线分析显示,相较于BRIP1低表达组,BRIP1高表达组胶质瘤生存期明显缩短(P<0.001)。ROC曲线分析显示BRIP1表达水平预测胶质瘤1年不良预后的曲线下面积(AUC)为0.744,最佳截断值为0.302,敏感性为0.832,特异性为0.528;预测3年不良预后的AUC为0.801,最佳截断值为0.420,敏感性为0.696,特异性为0.809;预测5年不良预后的AUC为0.767,最佳截断值为0.420时,敏感性为0.593,特异性为0.842。基因富集分析显示BRIP1基因主要富集于DNA复制、同源重组、错配修复和细胞周期等信号转导通路。结论BRIP1在人脑胶质瘤表达上调,与胶质瘤不良预后密切相关。

siRNA沉默染色质解旋酶DNA结合蛋白1对卵巢癌HO-8910PM细胞增殖、侵袭、迁移的影响

目的:探究siRNA沉默染色质解旋酶DNA结合蛋白1(CHD1L)对卵巢癌HO-8910PM细胞增殖、侵袭、迁移及相关分子如核因子κB(NF-κB)、基质金属蛋白酶(MMP)的影响。方法:将si-CHD1L、si-NC质粒转染至卵巢癌HO-8910PM细胞,命名为si-CHD1L组、si-NC组,以未经转染细胞作为对照组,实时荧光定量PCR(qRT-PCR)检测细胞CHD1L mRNA表达; CCK-8法检测细胞增殖抑制情况;划痕实验检测细胞迁移能力;Transwell小室系统检测细胞迁移、侵袭能力;蛋白免疫印迹(WB)检测NF-κB、MMP-2、MMP-9蛋白表达。结果:与对照组、si-NC组比较,si-CHD1L组细胞CHD1L mRNA表达降低(P<0.05),细胞增殖抑制率升高,细胞迁移能力降低,迁移、侵袭数量降低(P<0.05)。与对照组、si-NC组相比,si-CHD1L组NF-κB、MMP-2、MMP-9蛋白表达降低(P<0.05)。结论:siRNA沉默CHD1L能够抑制卵巢癌HO-8910PM细胞增殖、侵袭、迁移,并能抑制NF-κB、MMP蛋白的表达,为卵巢癌的靶向治疗提供一定的理论依据。

RTEL1基因多态性与COPD易感性的相关性研究

目的研究端粒延长解旋酶1(RTEL1)基因rs4809324、rs6010620位点单核苷酸多态性(SNPs)与慢性阻塞性肺疾病(COPD)易感性之间的相关性。方法选择315例COPD患者作为研究对象,同期招募240例健康体检者作为对照组。采用Sanger测序法检测所有受试者的RTEL1基因rs4809324、rs6010620位点基因型,并分析其与COPD易感性和严重程度的相关性。结果研究组rs4809324位点突变纯合型CC基因频率明显高于对照组,差异有统计学意义(χ2=7.12,P<0.05),该位点突变型等位基因C基因频率亦明显高于对照组(校正后OR=1.19,95%CI 1.06~1.32)。研究组rs6010620位点各基因型频率和等位基因频率与对照组比较,差异均无统计学意义(χ2分别=2.67、0.86,P均>0.05)。RTEL1基因rs4809324位点突变型等位基因C携带者COPD的严重程度明显高于野生型等位基因携带者,差异有统计学意义(χ2=9.29,P<0.05),校正后OR为1.23,95%CI 1.07~1.39。rs6010620位点SNP与COPD严重程度比较,差异均无统计学意义(χ2分别=2.67、0.08,P均>0.05)。结论 RTEL1基因rs4809324位点单核苷酸多态性与COPD易感性有关,突变型C等位基因携带者具有较高的COPD患病风险,且更易发展为重症的COPD。

RNA传感器IFIH1对HPV阳性的宫颈癌细胞增殖、迁移和侵袭的影响

目的探讨RNA传感器干扰素诱导的解旋酶C结构域蛋白1(interferon-induced helicase C domain protein 1,IFIH1)对人乳头瘤病毒18型(human papillomavirus 18,HPV18)阳性的人宫颈癌细胞HeLa增殖、迁移和侵袭的影响。方法利用GEPIA数据库分析IFIH1在正常宫颈组织和宫颈癌组织中的表达。Western blot检测IFIH1在C33A和HeLa细胞中的表达。将HPV18基因组转染到正常上皮细胞HaCaT中,并利用Western blot和实时定量PCR检测IFIH1的表达水平。利用实时无标记动态细胞分析技术和CCK8法检测细胞的增殖能力。划痕愈合实验、Transwell迁移实验和侵袭实验分别检测细胞的迁移能力和侵袭能力。Western blot和免疫荧光实验检测STAT3和磷酸化STAT3的蛋白表达和定位。结果GEPIA数据库分析显示IFIH1在宫颈癌组织中的表达量明显高于正常宫颈组织(P<0.05);相比于C33A细胞,HeLa细胞中IFIH1的表达水平明显增加(P<0.01);与正常HaCaT细胞相比,转染HPV18的HaCaT细胞中IFIH1的表达增加(P<0.01);与阴性对照相比,敲低IFIH1明显抑制HeLa细胞的增殖、迁移和侵袭能力,而过表达IFIH1则促进C33A细胞的增殖、迁移和侵袭(P<0.01);敲低IFIH1后,磷酸化STAT3蛋白的表达减少(P<0.01)。结论IFIHI在被HPV感染的宫颈癌细胞中表达增加,这将促进细胞的增殖、迁移和侵袭能力,可能与激活STAT3有关。