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Detection of eukaryotic translation initiation factor 4E and its clinical significance in hepatocellular carcinoma 被引量:2
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作者 Xiao-Lin Wang Hong-Pei Cai +1 位作者 Jun-Hui Ge Xiao-Feng Su 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第20期2540-2544,共5页
AIM:To study the expression of eukaryotic translation initiation factor 4E(eIF4E),which is closely correlated with malignant tumors,and its relationship to prognosis in hepatocellular carcinoma. METHODS:Western blotti... AIM:To study the expression of eukaryotic translation initiation factor 4E(eIF4E),which is closely correlated with malignant tumors,and its relationship to prognosis in hepatocellular carcinoma. METHODS:Western blotting was performed to quantify the elF4E protein expression in the normal human liver cell line L02 and the hepatoma cell lines Hep3B, HepG2,and Huh7.Forty-six hepatocellular carcinoma samples with complete clinical data were obtained from Changzheng Hospital during the period of December 2008 to July 2009.The expression of eIF4E in the tumor samples and their adjacent tissues were detected by immunohistochemistry.The relationship between the test results and hepatocellular carcinoma(HCC) prognosis was statistically analysed by using a COX proportional hazard model. RESULTS:Western blotting analysis showed that there were distinct eIF4E protein bands in all three of the hepatoma cell lines.In particular,the HepG2 cell line had the highest level of eIF4E protein expression.The L02 cell group had a low eIF4E expression.Immunohistochemical assay showed that there were 32 cases in which the tumour tissue expression was higher than their adjacent tissues,accounting for 69.57%.There were also 14 cases in which the tumour tissue expression was lower or no significant difference was found, accounting for 30.43%.COX proportional hazards model analysis showed that HCC prognosis was related to the depth of invasion,the overexpression of eIF4E and p53, possibly as independent HCC prognostic predictors. CONCLUSION:In summary,eIF4E expression is associated with liver cancer,and patients with high eIF4E expression levels have a higher risk of recurrence. 展开更多
关键词 Hepatocellular carcinoma eukaryotic translation initiation factor 4E Western blotting IMMUNOHISTOCHEMISTRY PROGNOSIS
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Relationship between Eukaryotic Translation Initiation Factor 4E and Malignant Angiogenesis in Non-Hodgkin Lymphoma 被引量:1
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作者 赵艳霞 刘文励 +2 位作者 周晟 周剑锋 孙汉英 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2005年第6期636-638,654,共4页
The relationship between angiogenesis and eukaryotic translation initiation factor 4E (EIF4E) expression level in non Hodgkin lymphoma (NHL) was studied. Mean microvessel density (MVD) and EIF4E were detected in... The relationship between angiogenesis and eukaryotic translation initiation factor 4E (EIF4E) expression level in non Hodgkin lymphoma (NHL) was studied. Mean microvessel density (MVD) and EIF4E were detected in 52 lymph node samples paraffin sections of patients with newly diagnosed NHL by the way of immunohistochemistry. Antisense EIF4E cDNA was cloned into plasmid pcDNA3.1 (+) and transfected into Raji cells. A series of angiogenesis related factors,including vascular endothelial growth factor (VEGF), matrix metalloproteinases 9 (MMP-9) and tissue inhibitor of metalloproteinases-2 (TIMP-2) proteins were detected by Western blot. The results showed that: (1) The Expression of EIF4E and MVD was higher in aggressive lymphomas than in indolent lymphomas(P〈0.05)and the expression of EIF4E was positively correlated with MVD in lymph node of NHL(r=0. 695, P〈0.01). (2) Antisense EIF4E eukaryocytic expression vector (pcDNA3. 1-EIF4Eas) was constructed successfully. (3) EIF4E, VEGF and MMP-9 were expressed at high levels in Raji cells as compared to normal human peripheral blood monocular cells (NHPMC), and blockage of EIF4E expression brought down the expression of VEGF and MMP-9. However, TIMP-2 was undetectable in Rail cells, although a moderate level of TIMP-2 was detected in NHPMC. It was concluded that the increased EIF4E expression was associated with aggressive property of NHL. 展开更多
关键词 eukaryotic translation initiation factor 4E non-Hodgkin lymphoma matrix metalloproteinases 9 tissue inhibitor of metalloproteinases-2
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Cloning and Characterization of Eukaryotic Translation Initiation Factor 4E (eIF4E) Gene Family in Ipomoea batatas L. (Lam) for Understanding Hexaploid Sweetpotato-Virus Interactions
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作者 Adrianne P. A. Brown Marceline Egnin +6 位作者 Foaziatu Bukari Osagie Idehen Inocent Ritte Desmond Mortley Gregory Bernard Deloris Alexander Conrad Bonsi 《American Journal of Molecular Biology》 CAS 2022年第4期203-244,共42页
Characterization of genes related to sweetpotato viral disease resistance is critical for understanding plant-pathogen interactions, especially with feathery mottle virus infection. For example, genes encoding eukaryo... Characterization of genes related to sweetpotato viral disease resistance is critical for understanding plant-pathogen interactions, especially with feathery mottle virus infection. For example, genes encoding eukaryotic translation initiation factor (eIF)4E, its isoforms, eIF(iso)4E, and the cap-binding protein (CBP) in plants, have been implicated in viral infections aside from their importance in protein synthesis. Full-length cDNA encoding these putative eIF targets from susceptible/resistant and unknown hexaploid sweetpotato (Ipomoea batatas L. Lam) were amplified based on primers designed from the diploid wild-type relative Ipomoea trifida consensus sequences, and designated IbeIF4E, IbeIF(iso)4E and IbCBP. Comparative analyses following direct-sequencing of PCR-amplified cDNAs versus the cloned cDNA sequences identified multiple homeoalleles: one to four IbeIF4E, two to three IbeIF(iso)4E, and two IbCBP within all cultivars tested. Open reading frames were in the length of 696 bp IbeIF4E, 606 bp IbeIF(iso)4E, and 675 bp IbCBP. The encoded single polypeptide lengths were 232, 202, and 225 amino acids for IbeIF4E, IbeIF(iso)4E, and IbCBP, with a calculated protein molecular mass of 26 kDa, 22.8 kDa, and 25.8 kDa, while their theoretical isoelectric points were 5.1, 5.57, and 6.6, respectively. Although the homeoalleles had similar sequence lengths, single nucleotide polymorphisms and multi-allelic variations were detected within the coding sequences. The multi-sequence alignment performed revealed a 66.9% - 96.7% sequence similarity between the predicted amino acid sequences obtained from the homeoalleles and closely related species. Furthermore, phylogenetic analysis revealed ancestral relationships between the eIF4E homeoalleles and other species. The outcome herein on the eIF4E superfamily and its correlation in sequence variations suggest opportunities to decipher the role of eIF4E in hexaploid sweetpotato feathery mottle virus infection. 展开更多
关键词 Ipomoea batatas eukaryotic translation initiation factors EIF4E CBP eIF(iso)4E Sweetpotato Viral Diseases
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Eukaryotic Translation Initiation Factors Shape RNA Viruses Resistance in Plants 被引量:2
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作者 Jannat Shopan Xiaolong Lv +2 位作者 Zhongyuan Hu Mingfang Zhang Jinghua Yang 《Horticultural Plant Journal》 2020年第2期81-88,共8页
Viruses are representative of a global threat to agricultural production. Genetic resistance is the preferred strategy for the control of viral infection and against loss of crop yield. Viral protein synthesis require... Viruses are representative of a global threat to agricultural production. Genetic resistance is the preferred strategy for the control of viral infection and against loss of crop yield. Viral protein synthesis requires host cellular factors for translating their viral RNAs, and for regulating their replication and cell to cell systemic movement. Therefore, the viruses are dependent on cellular translation factors. Mutations in the gene encoding eIF4E and eIF4G or their isoforms, eIFiso4 E, eIFiso4 G and eIF2Bβ have been mapped as a source of plant potyvirus while other genus of plant virus recessive resistance genes in many species are originated from these loci. Some of other plant translation factors, such as eIF3,eIF4 A-like helicases, eEF1A and eEF1B, which are required in interacting with viral RNAs and regulating various aspects of the infection cycle,have also been identified. Here, we summarized the mechanisms utilized by RNA viruses of eukaryotic plants and the essential roles of e IFs in virus infection. Moreover, we discussed the potential of e IFs as a target gene in the development of genetic resistance to viruses for crop improvement. This review highlighted newly revealed examples of abnormal translational strategies and provided insights into natural host resistance mechanisms that have been linked to 3 cap-independent translational enhancer activity. 展开更多
关键词 eukaryotic translation initiation factor genome EDITING 3 cap-independent translationAL ENHANCER virus RESISTANCE
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Eukaryotic initiation factor 5A2 and human digestive system neoplasms 被引量:3
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作者 Qing-Bin Meng Jing-Jing Peng +3 位作者 Zi-Wei Qu Xiao-Min Zhu Zhang Wen Wei-Ming Kang 《World Journal of Gastrointestinal Oncology》 SCIE CAS 2019年第6期449-458,共10页
Eukaryotic initiation factor 5A2(eIF5A2),as one of the two isoforms in the family,is reported to be a novel oncogenic protein that is involved in multiple aspects of many types of human cancer.Overexpression or gene a... Eukaryotic initiation factor 5A2(eIF5A2),as one of the two isoforms in the family,is reported to be a novel oncogenic protein that is involved in multiple aspects of many types of human cancer.Overexpression or gene amplification of EIF5A2 has been demonstrated in many cancers.Accumulated evidence shows that eIF5A2 initiates tumor formation,enhances cancer cell growth,increases cancer cell metastasis,and promotes treatment resistance through multiple means,including inducing epithelial–mesenchymal transition,cytoskeletal rearrangement,angiogenesis,and metabolic reprogramming.Expression of eIF5A2 in cancer correlates with poor survival,advanced disease stage,as well as metastasis,suggesting that eIF5A2 function is crucial for tumor development and maintenance but not for normal tissue homeostasis.All these studies suggest that eIF5A2 is a useful biomarker in the prediction of cancer prognosis and serves as an anticancer molecular target.This review focuses on the expression,subcellular localization,post-translational modifications,and regulatory networks of eIF5A2,as well as its biochemical functions and evolving clinical applications in cancer,especially in human digestive system neoplasms. 展开更多
关键词 eukaryotic translation initiation factor 5A2 HYPUSINE MODIFICATION ACETYLATION MODIFICATION Drug resistance Cancer THERAPEUTICS
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Localization and function of a eukaryotic-initiation-factor-2-associated 67-kDa glycoprotein
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作者 Shiyong Wu,Edison Biotechnology Institute,Department of Chemistry and Biochemistry,Ohio University,Athens,OH 45701,United States 《World Journal of Biological Chemistry》 CAS 2010年第10期313-320,共8页
AIM: To study the localization and function of a eukaryotic initiation factor 2 (eIF2α)-associated 67-kDa glycoprotein (p67).METHODS: Immunofluorescence staining,35S-Met/Cys metabolic labeling,Western blotting analys... AIM: To study the localization and function of a eukaryotic initiation factor 2 (eIF2α)-associated 67-kDa glycoprotein (p67).METHODS: Immunofluorescence staining,35S-Met/Cys metabolic labeling,Western blotting analysis,sucrose gradient centrifugation and high speed centrifugation were used to determine the localization of proteins in transiently transfected COS-1 cells.Transient co-transfection followed by co-immunoprecipitation was used to study the interaction between p67 and double-stranded RNA (dsRNA)-dependent protein kinase (PKR).Wheat germ agglutinin agarose beads were used to absorb glycosylated proteins.In vivo 32P-labeling followed by immunoprecipitation and Western blotting were used to measure PKR autophosphorylation,eIF2α phosphorylation,and p67 expression in normal and breast cancer cells.RESULTS: The image from immunofluorescence staining showed that p67 was overexpressed in the cytosol but not in the nucleus.In a sucrose gradient,approxi-mately 30% of the overexpressed p67 was bound with ribosomes.p67 interacted with the kinase domain,butnot the dsRNA-binding domains of PKR.Only the glycosylated p67 was associated with the ribosome,and p67 did not compete with PKR for ribosome binding.In breast cancer cells,there was increased autophosphorylation of PKR but no phosphorylation of eIF2α,compared with normal breast cells.α The ratio of glycosylated/deglycosylated p67 was altered in breast cancer cells.CONCLUSION: Glycosylation of p67 is required for its ribosomal association and can potentially inhibit PKR via interaction with the kinase domain of PKR. 展开更多
关键词 eukaryotic translation initiation factor 2 p67 DOUBLE-STRANDED RNA dependent protein KINASE PHOSPHORYLATION Cancer
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肝细胞肝癌组织中WDR4和EIF2A的表达及临床预后价值
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作者 陶珊珊 王竞 黄桂春 《徐州医科大学学报》 CAS 2024年第2期112-118,共7页
目的探讨肝细胞肝癌(HCC)组织中WD重复结构域4(WDR4)、真核翻译起始因子2A(EIF2A)的表达情况及临床预后意义。方法收集2019年1月—2020年1月南京大学医学院附属金陵医院收治的90例HCC患者的临床资料。利用R语言(4.2.1版本)分析癌症基因... 目的探讨肝细胞肝癌(HCC)组织中WD重复结构域4(WDR4)、真核翻译起始因子2A(EIF2A)的表达情况及临床预后意义。方法收集2019年1月—2020年1月南京大学医学院附属金陵医院收治的90例HCC患者的临床资料。利用R语言(4.2.1版本)分析癌症基因组图谱(TCGA)数据库下载的327对HCC癌组织和癌旁组织中WDR4 mRNA、EIF2A mRNA表达的转录组测序数据。免疫组织化学检测HCC癌组织、癌旁组织中WDR4、EIF2A表达。分析HCC癌组织WDR4、EIF2A表达与临床病理特征的关系。Kaplan-Meier法分析WDR4、EIF2A表达对HCC患者预后的影响。Cox回归模型分析HCC预后的影响因素。结果HCC癌组织WDR4 mR-NA、EIF2A mRNA表达高于癌旁组织,差异有统计学意义(P均<0.05)。HCC癌组织中WDR4、EIF2A表达阳性率高于癌旁组织,差异有统计学意义(P均<0.05)。HCC癌组织WDR4 mRNA与EIF2A mRNA表达呈正相关(r=0.404,P<0.001)。HCC癌组织中WDR4蛋白与EIF2A蛋白表达呈正相关(r=0.667,P<0.05)。肿瘤最大径>5 cm、TNM分期Ⅲ期及浸润型HCC癌组织中WDR4、EIF2A阳性率分别高于肿瘤最大径≤5 cm、TNM分期Ⅰ-Ⅱ期及非浸润型癌组织,差异有统计学意义(P均<0.05)。WDR4阳性组3年累积生存率明显低于WDR4阴性组,差异有统计学意义(P=0.016)。EIF2A阳性组3年累积生存率明显低于EIF2A阴性组,差异有统计学意义(P=0.022)。肿瘤TNM分期Ⅲ期、肿瘤最大径>5 cm、WDR4阳性、EIF2A阳性是HCC患者不良预后的独立危险因素。结论HCC组织中WDR4、EIF2A表达升高,两者与HCC不良临床病理特征有关,是评估HCC预后的肿瘤标志物。 展开更多
关键词 肝细胞肝癌 WD重复结构域4 真核翻译起始因子2A 临床病理特征 预后
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糖尿病肾病患者血清真核细胞翻译启始子2α、活化转录因子4水平与肾组织损伤、肾功能的相关性分析
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作者 毛财凤 危娜敏 +3 位作者 汪太斌 乔雨珊 范瑞杰 李泽发 《实用临床医药杂志》 CAS 2024年第10期73-77,共5页
目的 探讨糖尿病肾病(DN)患者血清真核细胞翻译启始子2α(eIF2α)、活化转录因子4(ATF4)水平与肾组织损伤程度和肾功能的相关性。方法 选择102例DN患者(DN组)和102例单纯糖尿病患者(对照组)为研究对象,根据肾组织损伤严重程度将DN患者... 目的 探讨糖尿病肾病(DN)患者血清真核细胞翻译启始子2α(eIF2α)、活化转录因子4(ATF4)水平与肾组织损伤程度和肾功能的相关性。方法 选择102例DN患者(DN组)和102例单纯糖尿病患者(对照组)为研究对象,根据肾组织损伤严重程度将DN患者分为微量白蛋白尿期组(MG组,35例)、显性蛋白尿期组(PG组,41例)和肾功能不全期组(RIG组,26例)。检测血清eIF2α、ATF4、尿素氮(BUN)、血肌酐(Scr)、胱抑素C(CysC)、估算的肾小球滤过率(eGFR)水平。采用Pearson相关性分析探讨eIF2α、ATF4与BUN、Scr、CysC、eGFR的相关性,采用多因素Logistic回归分析探讨DN发病的危险因素,采用受试者工作特征(ROC)曲线分析eIF2α和ATF4诊断DN的价值。结果 DN组血清eIF2α、ATF4、BUN、Scr、CysC水平高于对照组,eGFR低于对照组,差异有统计学意义(P<0.05)。RIG组血清eIF2α和ATF4水平高于PG组和MG组,差异有统计学意义(P<0.05)。DN患者血清eIF2α、ATF4水平与BUN、Scr、CysC呈正相关,与eGFR呈负相关(P<0.05)。较长糖尿病病程、较高体质量指数、高水平eIF2α、高水平ATF4是DN的危险因素(P<0.05)。eIF2α、ATF4诊断DN的曲线下面积分别为0.770、0.799,联合诊断曲线下面积为0.879,大于单独诊断(P<0.05)。结论 DN患者血清eIF2α、ATF4水平增高,且与DN肾损伤程度加重以及肾功能减退有关,eIF2α联合ATF4在DN诊断中有较高价值。 展开更多
关键词 糖尿病肾病 肾功能 内质网应激 真核细胞翻译启始子2α 活化转录因子4
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瘢痕疙瘩miR-557和eIF2a的表达及靶向关系研究
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作者 贾红侠 兰东 +1 位作者 于思思 张杰 《实用皮肤病学杂志》 2024年第1期1-7,共7页
目的检测瘢痕疙瘩中微小RNA-557(miR-557)和真核细胞翻译起始因子2a(eIF2a)在病变组织和细胞株中的表达特征,明确两者的靶向关系。方法选择首都医科大学附属北京朝阳医院诊治患者术后的瘢痕疙瘩(n=98)、增生性瘢痕组织(n=49)和正常皮肤... 目的检测瘢痕疙瘩中微小RNA-557(miR-557)和真核细胞翻译起始因子2a(eIF2a)在病变组织和细胞株中的表达特征,明确两者的靶向关系。方法选择首都医科大学附属北京朝阳医院诊治患者术后的瘢痕疙瘩(n=98)、增生性瘢痕组织(n=49)和正常皮肤组织(n=49)。应用实时荧光定量聚合酶链反应(qRT-PCR)检测miR-557的表达,应用免疫组化检测eIF2a和Ki-67的表达。分离培养瘢痕疙瘩组织中的成纤维细胞,应用双荧光素酶报告基因实验观察miR-57与eIF2a的靶向关系。结果瘢痕疙瘩中miR-557的表达量明显低于增生性瘢痕组织和正常皮肤组织(P<0.05),瘢痕疙瘩中eIF2a表达的阳性率明显高于增生性瘢痕组织和正常皮肤组织(P<0.05),miR-557和eIF2a在不同病变最大径、不同增殖指数和有无伴随症状中的比较差异有统计学意义(P<0.05)。瘢痕疙瘩中miR-557与eIF2a呈负相关性(r=-0.69,P=0.016)。双荧光素酶报告基因实验显示miR-557与eIF2a具有靶向关系。结论miR-557在瘢痕疙瘩中的表达下降,eIF2a的表达升高,均与临床及组织病理特征有关,miR-557与eIF2a具有靶向负调控关系。 展开更多
关键词 瘢痕疙瘩 增生性瘢痕 微小RNA-557 真核翻译起始因子2a 组织病理 靶向关系
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真核翻译起始因子4γ2调控N-乙酰氨基半乳糖转移酶1 mRNA对胃癌细胞恶性表型的影响 被引量:1
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作者 李海洋 张淼 +7 位作者 陆峰 戴素华 李芳芳 鱼红亮 后博 张伟 张明雷 尹晓东 《实用临床医药杂志》 CAS 2023年第2期40-49,共10页
目的探讨真核翻译起始因子4γ2(EIF4G2)通过调控N-乙酰氨基半乳糖转移酶1(GALNT1)mRNA对胃癌进展的影响。方法通过生物信息数据库分析GALNT1、EIF4G2在胃癌细胞和胃癌组织中的表达及与胃癌患者预后的关系,并分析胃癌组织中EIF4G2、GALNT... 目的探讨真核翻译起始因子4γ2(EIF4G2)通过调控N-乙酰氨基半乳糖转移酶1(GALNT1)mRNA对胃癌进展的影响。方法通过生物信息数据库分析GALNT1、EIF4G2在胃癌细胞和胃癌组织中的表达及与胃癌患者预后的关系,并分析胃癌组织中EIF4G2、GALNT1表达的相关性。采用实时荧光定量聚合酶链反应(RT-qPCR)检测GALNT1 mRNA、EIF4G2 mRNA在人胃黏膜上皮细胞GES-1和人胃癌细胞(AGS细胞等)中的表达水平,并采用蛋白质印迹法(Western blot)检测GALNT1、EIF4G2蛋白表达水平。建立干扰GALNT1和过表达EIF4G2的AGS细胞株,采用CCK-8法和克隆形成实验检测细胞增殖能力,采用TUNEL实验检测细胞凋亡能力,采用划痕实验和Transwell实验分别检测细胞迁移和侵袭能力,采用Western blot检测凋亡和转移相关蛋白表达水平,采用RIP实验和RNA下拉实验检测GALNT1 mRNA与EIF4G2的结合关系。结果胃癌组织和胃癌细胞中的GALNT1、EIF4G2水平分别高于正常组织和人胃黏膜上皮细胞,差异有统计学意义(P<0.001),且与胃癌患者预后差相关;胃癌组织中,EIF4G2表达与GALNT1表达呈正相关。敲低GALNT1后,AGS细胞活力降低,克隆形成数、迁移和侵袭细胞数减少,凋亡细胞数增加,Bcl-2、MMP2、MMP9蛋白表达降低,Bax、cleaved-caspase3、cleaved-caspase9蛋白表达增加,差异有统计学意义(P<0.001)。EIF4G2可与GALNT1 mRNA结合,促进GALNT1 mRNA、GALNT1蛋白表达及GALNT1 mRNA稳定性,差异有统计学意义(P<0.001)。共转染sh-GALNT1-1与oe-EIF4G2可逆转sh-GALNT1-1对AGS细胞增殖、凋亡、迁移和侵袭的作用,差异有统计学意义(P<0.05或P<0.01或P<0.001)。结论EIF4G2可通过稳定GALNT1 mRNA促进胃癌细胞增殖、迁移、侵袭并抑制细胞凋亡,其或可成为胃癌临床诊疗的新靶点。 展开更多
关键词 胃癌 真核翻译起始因子2 N-乙酰氨基半乳糖转移酶1 迁移 侵袭 RNA结合蛋白
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真核翻译起始因子4G1与恶性肿瘤的研究进展
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作者 彭秀娟 张丹凤 《中国医药科学》 2024年第9期31-35,共5页
真核翻译起始因子4G1(eIF4G1)是一种大型支架蛋白,在真核生物mRNA翻译起始过程中,可作为蛋白质的对接位点,介导帽依赖性与非帽依赖性翻译启动。eIF4G1是翻译调控中的重要靶标,被认为参与多种肿瘤细胞的生长、迁移、增殖、侵袭和凋亡。... 真核翻译起始因子4G1(eIF4G1)是一种大型支架蛋白,在真核生物mRNA翻译起始过程中,可作为蛋白质的对接位点,介导帽依赖性与非帽依赖性翻译启动。eIF4G1是翻译调控中的重要靶标,被认为参与多种肿瘤细胞的生长、迁移、增殖、侵袭和凋亡。近年来,随着对eIF4G1研究的深入,临床对其作用和功能也有了更深的理解,本文总结相关文献,对eIF4G1的功能、研究现状及与肿瘤的关系做一简要综述。 展开更多
关键词 真核翻译起始因子4G1 帽依赖性翻译 真核翻译起始因子 肿瘤 MRNA
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EIF4A3 shRNA慢病毒载体的构建及其稳定转染细胞系的建立
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作者 何嘉文 李友 +1 位作者 廖科棋 李胜男 《吉林大学学报(医学版)》 CAS CSCD 北大核心 2024年第3期831-839,共9页
目的:构建真核细胞翻译起始因子4A3(EIF4A3)-短发夹RNA(shRNA)慢病毒载体,建立Neuro-2a-EIF4A3-shRNA稳定转染细胞系。方法:通过美国国家生物技术信息中心(NCBI)数据库检索EIF4A3基因序列,设计并合成PCR鉴定引物,并将其连接至经EcoRⅠ和... 目的:构建真核细胞翻译起始因子4A3(EIF4A3)-短发夹RNA(shRNA)慢病毒载体,建立Neuro-2a-EIF4A3-shRNA稳定转染细胞系。方法:通过美国国家生物技术信息中心(NCBI)数据库检索EIF4A3基因序列,设计并合成PCR鉴定引物,并将其连接至经EcoRⅠ和AgeⅠ酶切的慢病毒GV493载体,构建GV493-EIF4A3-shRNA慢病毒质粒,PCR筛选阳性克隆并测序鉴定。将GV493空载质粒和GV493-EIF4A3-shRNA重组质粒分别转染至HEK293T细胞中,分别为GV493对照慢病毒和GV493-EIF4A3-shRNA慢病毒,转染48 h后收集慢病毒进行包装并测定病毒滴度。将Neuro-2a细胞分为空白组、GV493对照组和GV493-EIF4A3 shRNA组,空白组不作处理,GV493对照组和GV493-EIF4A3 shRNA组分别采用相应慢病毒感染Neuro-2a细胞,慢病毒感染复数(MOI)为100,使用10 mg·L-1嘌呤霉素筛选成功感染慢病毒的Neuro-2a细胞,荧光显微镜观察各组Neuro-2a细胞的生长状态和绿色荧光表达情况;实时荧光定量PCR(RT-qPCR)法和Western blotting法检测各组Neuro-2a细胞中EIF4A3 mRNA及蛋白表达水平。结果:PCR测序结果显示GV493-EIF4A3-shRNA重组质粒基因序列与设计合成的EIF4A3-shRNA序列一致,成功构建GV493-EIF4A3慢病毒载体。荧光显微镜观察可见HEK293T细胞荧光表达强烈,生长状态良好,慢病毒包装成功。GV493-对照慢病毒和GV493-EIF4A3-shRNA慢病毒的滴度均为2×10~8 TU·mL^(-1),GV493对照组和GV493-EIF4A3 shRNA组Neuro-2a细胞生长状态良好且表达绿色荧光,表明慢病毒感染稳定细胞系构建成功。RT-qPCR法,与空白组和GV493对照组比较,GV493-EIF4A3shRNA组Neuro-2a细胞EIF4A3mRNA表达水平明显降低(P<0.01)。Western blotting法,各组在相对分子质量49000处出现特异性条带,提示Neuro-2a细胞中EIF4A3蛋白表达成功;与空白组和GV493对照组比较,GV493-EIF4A3 shRNA组Neuro-2a细胞中EIF4A3蛋白表达水平明显降低(P<0.01)。结论:成功构建GV493-EIF4A3-shRNA慢病毒载体,建立了Neuro-2a-EIF4A3-shRNA稳定转染细胞系,为EIF4A3在颅内动脉粥样硬化的作用机制研究提供了参考。 展开更多
关键词 真核细胞翻译起始因子4A3 短发夹RNA 慢病毒 稳定转染细胞系 Neuro-2a细胞
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声门上型喉鳞状细胞癌组织VEGF、MMP-2、eIF4E的表达及临床意义 被引量:4
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作者 孙树军 刘清明 +2 位作者 田军 周建明 张爱玲 《中国耳鼻咽喉颅底外科杂志》 CAS 2007年第5期332-336,共5页
目的研究声门上型喉鳞癌及癌旁组织中VEGF、MMP-2、eIF4E的表达及与临床病理参数的关系。方法采用免疫组化SP法检测28例声门上喉鳞癌组织及癌旁组织中VEGF、MMP-2、eIF4E的表达。结果在声门上型喉癌组织中VEGF、MMP-2、eIF4E阳性表达率... 目的研究声门上型喉鳞癌及癌旁组织中VEGF、MMP-2、eIF4E的表达及与临床病理参数的关系。方法采用免疫组化SP法检测28例声门上喉鳞癌组织及癌旁组织中VEGF、MMP-2、eIF4E的表达。结果在声门上型喉癌组织中VEGF、MMP-2、eIF4E阳性表达率分别为78.57%,75%,89.28%;在癌旁组织中阳性表达率分别为21.42%,17.85%,42.85%。三者在肿瘤组织及癌旁组织中的表达差异有统计学意义(P<0.05),其表达与肿瘤淋巴结转移密切相关(P<0.05),三者间存在正相关。结论VEGF、MMP-2、eIF4E是声门上喉鳞癌组织表达较敏感的标志物,可作为反应喉癌生物学行为的客观参考指标,有助于判断患者预后,及有利于肿瘤治疗方案的制定。 展开更多
关键词 喉肿瘤 鳞状细胞 血管内皮生长因子 基质金属蛋白酶-2 翻译起始因子-4E
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siRNA沉默eIF4E诱导人喉癌Hep-2细胞凋亡及其机制 被引量:1
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作者 王贺彬 汪雅芳 +3 位作者 沈妙言 李娜 赵丽晶 滕博 《吉林大学学报(医学版)》 CAS CSCD 北大核心 2014年第1期39-43,I0001,共6页
目的:观察真核细胞翻译起始因子4E(eIF4E)基因的靶向小干扰RNA(siRNA)对喉癌Hep-2细胞中eIF4E基因表达的影响,探讨其诱导喉癌细胞凋亡的作用机制。方法:采用脂质体LipofectamineTM2000将siRNA-eIF4E转染入人喉癌Hep-2细胞(siRNA-eIF4E... 目的:观察真核细胞翻译起始因子4E(eIF4E)基因的靶向小干扰RNA(siRNA)对喉癌Hep-2细胞中eIF4E基因表达的影响,探讨其诱导喉癌细胞凋亡的作用机制。方法:采用脂质体LipofectamineTM2000将siRNA-eIF4E转染入人喉癌Hep-2细胞(siRNA-eIF4E组),同时设空白对照组和空质粒组。MTT法检测siRNA对Hep-2细胞增殖的抑制作用,罗丹明染色检测转染后细胞内线粒体膜电位的变化,TUNEL染色法检测细胞凋亡,RT-PCR和Western blotting法检测凋亡相关基因转录和蛋白表达水平的变化。结果:与空白对照组及空质粒组比较,siRNA-eIF4E组Hep-2细胞中eIF4E基因转录和表达水平明显下调(P<0.01),Hep-2细胞生存率下降(P<0.05),细胞线粒体膜电位降低(P<0.05),细胞凋亡率增加(P<0.05),凋亡相关基因Bim、Bid及Caspase-3表达上调(P<0.05)。结论:siRNA-eIF4E在体外可抑制人喉癌Hep-2细胞增殖,其机制可能是通过激活线粒体凋亡途径诱导Hep-2细胞凋亡。 展开更多
关键词 小干扰RNA 真核细胞翻译起始因子4E 喉肿瘤 HEP-2细胞 细胞凋亡
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长链非编码RNA LINC00641通过微小RNA-181d-5p靶向真核细胞翻译起始因子4A2抑制宫颈癌细胞增殖的研究 被引量:1
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作者 张杨 王刚 +3 位作者 陈侠 张云志 秋彤 高飞 《中国性科学》 2022年第2期117-122,共6页
目的观察长链非编码RNA(LncRNA)LINC00641(LINC00641)在宫颈癌细胞中的表达特征,探讨LINC00641通过微小RNA-181 d-5p(miR-181 d-5p)/真核细胞翻译起始因子4A2(EIF4A2)对宫颈癌细胞增殖的调节作用。方法选择宫颈癌Hela细胞株,建立空白对... 目的观察长链非编码RNA(LncRNA)LINC00641(LINC00641)在宫颈癌细胞中的表达特征,探讨LINC00641通过微小RNA-181 d-5p(miR-181 d-5p)/真核细胞翻译起始因子4A2(EIF4A2)对宫颈癌细胞增殖的调节作用。方法选择宫颈癌Hela细胞株,建立空白对照组,构建转染pc-DNA3.1的无关序列组、转染pc-DNA3.1-LINC00641的pc-DNA-LINC00641组、转染pc-DNA3.1-LINC00641-siRNA的si-LINC00641组,转染miR-181 d-5p inhibitor的miR-181 d-5p inhibitor组、转染miR-181 d-5p mimic的miR-181 d-5p mimic组、转染siRNA-EIF4A2的si-EIF4A2组。采用CCK-8实验检测细胞增殖活性,采用双荧光素酶报告基因实验观察LINC00641和miR-181 d-5p、miR-181 d-5p、EIF4A2的靶向关系。选取2019年12月至2021年1月陕西中医药大学第二附属医院诊治的45例宫颈鳞癌且未行术前新辅助放、化疗的女性患者作为研究对象,留取其术后肿瘤组织(宫颈鳞癌组织)。另选取45例因子宫肌瘤行子宫全切术,且经病理确诊为慢性宫颈炎的患者,留取其宫颈组织(慢性宫颈炎组织)。采用实时荧光定量聚合酶链反应(qRT-PCR)法检测LINC00641和miR-181 d-5p的表达,采用免疫组化SP法检测EIF4A2和Ki67的表达,采用Pearson检验分析其相关性。结果生物信息分析显示,LINC00641与miR-181 d-5p、miR-181 d-5p、EIF4A2具有可能的结合位点。与空白对照组和无关序列组比较,pc-DNA-LINC00641组、miR-181 d-5p mimic组、si-EIF4A2组细胞增殖活性下降,si-LINC00641组、miR-181 d-5p inhibitor组细胞增殖活性升高。双荧光素酶报告基因实验显示,LINC00641与miR-181 d-5p、miR-181 d-5p、EIF4A2具有靶向关系。挽救实验显示,沉默EIF4A2可部分逆转沉默LINC00641和沉默miR-181 d-5p对细胞增殖的促进作用。与慢性宫颈炎组织比较,宫颈鳞癌组织中LINC00641、miR-181 d-5p低表达,EIF4A2高表达(P<0.05)。Pearson相关分析显示,LINC00641与miR-181 d-5p、EIF4A2、Ki67呈正相关性,miR-181 d-5p与EIF4A2呈负相关性。结论LINC00641通过miR-181 d-5p/EIF4A2抑制宫颈癌细胞的增殖,调控肿瘤的形成和进展。 展开更多
关键词 长链非编码RNA LINC00641 宫颈癌 增殖 微小RNA-181 d-5p 真核细胞翻译起始因子4A2 调控
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前列地尔对暴发性肝衰竭大鼠eIF2α/ATF4/CHOP通路及肝功能的影响 被引量:2
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作者 李盼盼 符健 +1 位作者 陈伟 陈丽 《中国比较医学杂志》 CAS 北大核心 2021年第8期55-62,共8页
目的探究前列地尔(PGE1)对暴发性肝衰竭(FHF)大鼠对肝功能的影响,并探讨其对真核翻译起始因子2α(eIF2α)/激活转录因子4(ATF4)/C/EBP同源蛋白(CHOP)通路的调控作用。方法SPF级SD雄性大鼠90只按随机数表法分为对照组、模型组、阳性对照... 目的探究前列地尔(PGE1)对暴发性肝衰竭(FHF)大鼠对肝功能的影响,并探讨其对真核翻译起始因子2α(eIF2α)/激活转录因子4(ATF4)/C/EBP同源蛋白(CHOP)通路的调控作用。方法SPF级SD雄性大鼠90只按随机数表法分为对照组、模型组、阳性对照组、低、中、高剂量PGE1组,除对照组外,其它组大鼠均采用腹腔注射D-氨基半乳糖(D-GalN)-大肠杆菌内毒素脂多糖(LPS)的方法建立FHF大鼠模型,对照组腹腔注射等量的生理盐水。造模6 h后,阳性对照组及低、中、高剂量PGE1组分别尾静脉注射促肝细胞生长素1.36 mg/kg,PGE112.5、25、37.5μg/kg,每天1次,连续给药3 d,对照组和模型组尾静脉注射等量的生理盐水。在造模72 h后处死大鼠,腹主动脉采血,检测血清丙氨酸氨基转氨酶(ALT)、天门冬氨酸氨基转移酶(AST)、总胆红素(TBIL)水平;解剖取肝组织用苏木精-伊红(HE)染色法观察各组大鼠肝组织病理学变化;采用实时荧光定量PCR(qRT-PCR)和蛋白免疫印迹(Western blot)法检测肝组织中eIF2α/ATF4/CHOP/半胱氨酸天冬氨酸蛋白酶-3(Caspase-3)mRNA和蛋白、磷酸化-eIF2α(p-eIF2α)蛋白水平。结果与对照组相比,模型组肝细胞广泛变性并有局灶性坏死,中央静脉受损,血清ALT、AST、TBIL,肝组织中eIF2α、ATF4、CHOP、Caspase-3 mRNA及p-eIF2α/eIF2α、ATF4、CHOP、Caspase-3蛋白水平均升高(P<0.05);与模型组相比,阳性对照组、低、中、高剂量PGE1组肝细胞损害有所降低,坏死细胞数量减少,血清ALT、AST、TBIL水平,肝组织中eIF2α、ATF4、CHOP、Caspase-3 mRNA及p-eIF2α/eIF2α、ATF4、CHOP、Caspase-3蛋白水平降低(P<0.05);且随着PGE1给药剂量的增加,低、中、高剂量PGE1组血清ALT、AST、TBIL水平,肝组织中eIF2α、ATF4、CHOP、Caspase-3 mRNA及p-eIF2α/eIF2α、ATF4、CHOP、Caspase-3蛋白水平依次降低(P<0.05),呈剂量依赖性;与阳性对照组相比,低、中剂量PGE1组血清ALT、AST、TBIL水平,肝组织中eIF2α、ATF4、CHOP、Caspase-3 mRNA及p-eIF2α/eIF2α、ATF4、CHOP、Caspase-3蛋白水平均升高(P<0.05),高剂量PGE1组血清ALT、AST、TBIL水平,肝组织中eIF2α、ATF4、CHOP、Caspase-3 mRNA及p-eIF2α/eIF2α、ATF4、CHOP、Caspase-3蛋白水平差异无统计学意义(P>0.05)。结论PGE1可能通过抑制eIF2α/ATF4/CHOP通路表达,减轻大鼠肝细胞凋亡,达到保护肝的作用,可能作为FHF潜在的治疗药物。 展开更多
关键词 前列地尔 暴发性肝功能衰竭 大鼠 真核翻译起始因子2α 激活转录因子4 C/EBP同源蛋白
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Structure and functions of the translation initiation factor eIF4E and its role in cancer development and treatment 被引量:5
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作者 Arianna Pisera Adele Campo Salvatore Campo 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2018年第1期13-24,共12页
In eukaryotic cells, protein synthesis is a complex and multi-step process that has several mechanisms to start the translation including cap-dependent and cap-independent initiation. The translation control of eukary... In eukaryotic cells, protein synthesis is a complex and multi-step process that has several mechanisms to start the translation including cap-dependent and cap-independent initiation. The translation control of eukaryotic gene expression occurs principally at the initiation step. In this context, it is critical that the eukaryotic translation initiation factor eIF4E bind to the 7-methylguanosine (m7G) cap present at the 5'- UTRs of most eukaryotic mRNAs. Combined with other initiation factors, elF4E mediates the mRNA recruitment on ribosomes to start the translation. Moreover, the eIF4E nuclear bodies are involved in the export of specific mRNAs from the nucleus to the cytoplasm. In this review, we focus on the elF4E structure and its physiological functions, and describe the role of eIF4E in cancer development and progression and the current therapeutic strategies to target eIF4E. 展开更多
关键词 elF4E factor translation initiation mRNA exportCancer
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Regulation of Eukaryotic Initiation Factor 4E and Its Isoform: Implications for Antiviral Strategy in Plants 被引量:3
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作者 Yu-Yang Zhang Han-Xia Li +1 位作者 Bo Ouyang Zhi-Biao Ye 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2006年第10期1129-1139,共11页
In recent years, biotechnology has permitted regulation of the expression of endogenous plant genes to improve agronomlcally important traits. Genetic modification of crops has benefited from emerging knowledge of new... In recent years, biotechnology has permitted regulation of the expression of endogenous plant genes to improve agronomlcally important traits. Genetic modification of crops has benefited from emerging knowledge of new genes, especially genes that exhibit novel functions, one of which is eukaryotlc initiation factor 4E (eIF4E). eIF4E Is one of the most important translation initiation factors Involved in eukaryotic initiation. Recent research has demonstrated that virus resistance mediated by eIF4E and Its isoform elf (Iso)4E occurs in several plant-virus interactions, thus indicating a potential new role for eIF4E/elF(Iso)4E In resistance strategies against plant viruses. In this review, we briefly describe eIF4E activity In plant translation, its potential role, and functions of the eIF4E subfamily In plant-virus interactions. Other initiation factors such as elF4G could also play a role In plant resistance against viruses. Finally, the potential for developing eIF4E-mediated resistance to plant viruses in the future Is discussed. Future research should focus on elucidation of the resistance mechanism and spectrum mediated by eIF4E. Knowledge of a particu- lar plant-virus interaction will help to deepen our understanding of eIF4E and other eukaryotic Initiation factors, and their involvement in virus disease control. 展开更多
关键词 EIF4E ANTIVIRUS eukaryotic initiation factors interaction plant
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CML细胞eIF4E和Trib2基因mRNA表达分析
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作者 黄莲芬 冯文莉 +1 位作者 万根平 罗红伟 《重庆医科大学学报》 CAS CSCD 北大核心 2010年第9期1358-1360,共3页
目的:为了探索慢性粒细胞白血病(Chronic myelogenous leukemia,CML)急变机理,寻求新的治疗靶标,我们对获得的9例CML病人骨髓标本以及CML急性红系变细胞株中K562细胞株中eIF4E基因和Trib2基因的表达水平进行初步检测,为进一步的研究奠... 目的:为了探索慢性粒细胞白血病(Chronic myelogenous leukemia,CML)急变机理,寻求新的治疗靶标,我们对获得的9例CML病人骨髓标本以及CML急性红系变细胞株中K562细胞株中eIF4E基因和Trib2基因的表达水平进行初步检测,为进一步的研究奠定基础。方法:分离骨髓单个核细胞,用Trizol裂解提取RNA,RT-PCR检测eIF4E基因和trib2基因mRNA的表达水平。结果:初步分析显示部分CML病人eIF4E基因mRNA表达水平很高,为CML疾病进展机制进一步研究奠定了基础。结论:部分CML病人骨髓标本中eIF4E和TRIB2基因mRNA表达水平较高,eIF4E和trib2有可能成为CML病人新的治疗靶点。 展开更多
关键词 慢性粒细胞白血病 真核细胞翻译起始因子4E Trib2
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鼠源eIF4A1基因克隆及其原核/真核表达鉴定 被引量:1
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作者 李梦茹 张文 +6 位作者 段辰星 马良 栗朵朵 彭璟 梁晶晶 罗廷荣 李晓宁 《南方农业学报》 CAS CSCD 北大核心 2023年第10期3073-3082,共10页
【目的】克隆昆明小鼠真核生物翻译起始因子4A1基因(eIF4A1)并构建其原核/真核表达载体,探究其结构和生物学特性,为在体内外鉴定eIF4A1互作蛋白网络打下基础。【方法】以昆明小鼠脑组织总RNA反转录合成的cDNA为模板,PCR扩增鼠源eIF4A1... 【目的】克隆昆明小鼠真核生物翻译起始因子4A1基因(eIF4A1)并构建其原核/真核表达载体,探究其结构和生物学特性,为在体内外鉴定eIF4A1互作蛋白网络打下基础。【方法】以昆明小鼠脑组织总RNA反转录合成的cDNA为模板,PCR扩增鼠源eIF4A1基因编码区(CDS)序列,然后克隆到pGEX-4T-1和pcDNA3.0载体上分别构建原核/真核表达载体;利用大肠杆菌BL21(DE3)感受态细胞对原核表达载体进行诱导表达、纯化及鉴定;同时以真核表达载体转染HEK-293T细胞,通过Western blotting和间接免疫荧光(IFA)检测eIF4A1蛋白在HEK-293T细胞内的表达及分布情况;并以ProtParam、ProtScale、TMHMM-2.0、SignalP-5.0、SOPMA和SWISS-MODEL等在线软件对鼠源eIF4A1蛋白进行生物学信息分析。【结果】鼠源eIF4A1基因CDS序列长1221 bp,克隆到pGEX-4T-1载体能成功构建原核表达载体pGEX-4T-eIF4A1-Flag,在25和30℃下经0.5 mmol/L IPTG诱导均能大量表达出融合蛋白eIF4A1-Flag,且主要以包涵体形式存在。将鼠源eIF4A1基因克隆至pcDNA3.0载体成功构建获得真核表达载体pcDNA3.0-eIF4A1-Flag,以其转染HEK-293T细胞后,eIF4A1蛋白在HEK-293T细胞中成功表达,且主要分布在细胞质中。生物信息学分析结果表明,eIF4A1蛋白相对分子量为46.15408 kD,理论等电点(pI)为5.267,含有407个氨基酸残基;属于不稳定的亲水性非分泌蛋白,无跨膜结构,也没有信号肽,其二级结构以α-螺旋和无规则卷曲为主。鼠源eIF4A1蛋白的主要互作蛋白有10个,除eIFs家族蛋白外,还包括Paip1和Pdcd4互作蛋白。【结论】eIF4A1主要是分布在细胞质,为不稳定的亲水性非分泌蛋白,无跨膜结构和信号肽,通过构建原核/真核表达载体表达获得的融合蛋白eIF4A1-Flag可用于筛选和鉴定eIF4A1互作蛋白,为深入探究eIFs的结构及生物学功能提供技术支持。 展开更多
关键词 鼠源 真核生物翻译起始因子(eIFs) eIF4A1基因 原核表达 真核表达 生物信息学分析
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