A sensitive reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay for human enterovirus 71 (EV71) and Coxsackievirus A16 (CVA16) infection was further evaluated. The one step reaction was perfor...A sensitive reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay for human enterovirus 71 (EV71) and Coxsackievirus A16 (CVA16) infection was further evaluated. The one step reaction was performed in a single tube at 65?C for 45 min for EV71 and 35 min for CVA16. The detection limits of RT-LAMP assays for both EV71 and CVA16 were 0.1 of a 50% tissue culture infective dose (TCID50) per reaction, based on 10—Fold dilutions of a titrated EV71 or CVA16 strain. The specific assay showed there were no cross-reactions with Coxsackievirus A (CVA) viruses (CVA 2, 4, 5, 7, 9, 10, 14, and 25), Coxsackievirus B (CVB) viruses (CVB 1, 2, 3, 4, and 5) or ECHO viruses (ECHO 3, 6, 11, and 19). In parallel with commercial quantitative real-time polymerase chain reaction (qRT-PCR) diagnostic kits for EV71 and CVA16, the RT-LAMP assay was evaluated with 515 clinical specimens, the results showed the RT-LAMP assay and the qRT-PCR assay were in complete agreement for 513/515 (99.6%) of the specimens. Two samples with discrepant results from two methods were further verified by nested reverse transcription polymerase chain reaction (nRT-PCR) assay and sequencing to be true positives for CVA16. In conclusion, RT-LAMP assay is demonstrated to be a sensitive and specific assay and have a great potential for the rapid and visual screening of EV71 and CVA16 in China, especially in those resource-limited hospitals and rural clinics of provincial and municipal regions.展开更多
Coxsackievirus A16(CVA16),together with enterovirus type 71(EV71),is responsible for most cases of hand,foot and mouth disease(HFMD) worldwide.Recent findings suggest that the recombination between CVA16 and EV71,and ...Coxsackievirus A16(CVA16),together with enterovirus type 71(EV71),is responsible for most cases of hand,foot and mouth disease(HFMD) worldwide.Recent findings suggest that the recombination between CVA16 and EV71,and the co-circulation of these two viruses may have contributed to the increase of HFMD cases in China over the past few years.It is therefore important to further understand the virology,epidemiology,virus-host interactions and host pathogenesis of CVA16.In this study,we describe the viral kinetics of CVA16 in human rhabdomyosarcoma(RD) cells by analyzing the cytopathic effect(CPE),viral RNA replication,viral protein expression,viral RNA package and viral particle secretion in RD cells.We show that CVA16 appears to first attach,uncoat and enter into the host cell after adsorption for 1 h.Later on,CVA16 undergoes rapid replication from 3 to 6 h at MOI 1 and until 9 h at MOI 0.1.At MOI 0.1,CVA16 initiates a secondary infection as the virions were secreted before 9 h p.i.CPE was observed after 12 h p.i.,and viral antigen was first detected at 6 h p.i.at MOI 1 and at 9 h p.i.at MOI 0.1.Thus,our study provides important information for further investigation of CVA16 in order to better understand and ultimately control infections with this virus.展开更多
本研究旨在探讨表没食子儿茶素没食子酯酸(epigallocatechin-3-gallate,EGCG)诱导人恶性淋巴瘤CA46细胞系p16基因去甲基化及转录激活的可能机制。以生长曲线、MTT法检测EGCG对CA46细胞生长和增殖的抑制作用;利用流式细胞仪DNA含量分析...本研究旨在探讨表没食子儿茶素没食子酯酸(epigallocatechin-3-gallate,EGCG)诱导人恶性淋巴瘤CA46细胞系p16基因去甲基化及转录激活的可能机制。以生长曲线、MTT法检测EGCG对CA46细胞生长和增殖的抑制作用;利用流式细胞仪DNA含量分析法探讨EGCG对CA46细胞周期的影响;采用巢式甲基特异性PCR法(nested-methylation specific PCR,n-MSP)及DNA克隆测序分析法检测EGCG作用前后CA46细胞p16基因甲基化状态;应用RT-PCR检测p16、DNA甲基转移酶(DNMT3A、DNMT3B)基因mRNA的表达。结果表明:与对照组相比,3组不同浓度EGCG均能明显抑制CA46细胞生长,G0/G1期细胞增加;不同浓度EGCG作用48小时后p16基因甲基化程度减弱;未处理组细胞p16基因呈微弱表达,未用药组、不同浓度EGCG(6、12、24)μg/ml处理组条带灰度值与β-actin1比值分别为(0.05±0.01)、(0.19±0.03)、(0.39±0.10)、(0.85±0.09),各处理组p16基因mRNA表达明显高于未用药组,其差异有显著意义(p<0.05);与对照组相比,EGCG作用48小时后CA46细胞甲基转移酶DNMT3A、DNMT3B mRNA的表达均下降。结论:EGCG可能通过抑制甲基转移酶DNMT3A、DNMT3B和(或)直接对p16基因去甲基化,使p16基因mRNA表达上调,恢复其活性,从而实现其对细胞周期的调控功能,将细胞阻滞于G0/G1期,抑制CA46细胞的增殖。展开更多
目的:检测子宫内膜异位症(Endometriosis,EMT)患者血IL-16、CA199水平,评估其在诊断、病情程度中的价值研究。方法:选择我院2019年6月至2020年3月收治并行腹腔镜治疗的75例EMT患者为EMT组,根据美国生育协会分期标准分为轻度组(I~II期,40...目的:检测子宫内膜异位症(Endometriosis,EMT)患者血IL-16、CA199水平,评估其在诊断、病情程度中的价值研究。方法:选择我院2019年6月至2020年3月收治并行腹腔镜治疗的75例EMT患者为EMT组,根据美国生育协会分期标准分为轻度组(I~II期,40例)和重度组(III~IV期,35例);另选择同期行健康体检的75例为对照组,分别采用酶联免疫法和电化学发光免疫检测腹腔镜手术当日空腹静脉血IL-16和CA199水平,比较不同患者的表达差异;同时分析单独及联合检测在EMT中的诊断价值。结果:EMT组患者的血IL-16、CA199水平均明显高于对照组(P<0.05);EMT轻度组患者血IL-16、CA199水平均明显低于EMT重度组(P<0.05);血IL-16联合CA199检测诊断EMT的灵敏度为87.5%,特异度为79.3%,曲线下面积(Area under the curve,AUC)为0.898(95%CI:0.805~0.956)。结论:血IL-16、CA199联合检测能够提高EMT的诊断效能,且表达水平随病情严重程度增高。展开更多
文摘A sensitive reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay for human enterovirus 71 (EV71) and Coxsackievirus A16 (CVA16) infection was further evaluated. The one step reaction was performed in a single tube at 65?C for 45 min for EV71 and 35 min for CVA16. The detection limits of RT-LAMP assays for both EV71 and CVA16 were 0.1 of a 50% tissue culture infective dose (TCID50) per reaction, based on 10—Fold dilutions of a titrated EV71 or CVA16 strain. The specific assay showed there were no cross-reactions with Coxsackievirus A (CVA) viruses (CVA 2, 4, 5, 7, 9, 10, 14, and 25), Coxsackievirus B (CVB) viruses (CVB 1, 2, 3, 4, and 5) or ECHO viruses (ECHO 3, 6, 11, and 19). In parallel with commercial quantitative real-time polymerase chain reaction (qRT-PCR) diagnostic kits for EV71 and CVA16, the RT-LAMP assay was evaluated with 515 clinical specimens, the results showed the RT-LAMP assay and the qRT-PCR assay were in complete agreement for 513/515 (99.6%) of the specimens. Two samples with discrepant results from two methods were further verified by nested reverse transcription polymerase chain reaction (nRT-PCR) assay and sequencing to be true positives for CVA16. In conclusion, RT-LAMP assay is demonstrated to be a sensitive and specific assay and have a great potential for the rapid and visual screening of EV71 and CVA16 in China, especially in those resource-limited hospitals and rural clinics of provincial and municipal regions.
基金Partly supported by the National Natural Science Foundation of China (No. 20872048)
文摘Coxsackievirus A16(CVA16),together with enterovirus type 71(EV71),is responsible for most cases of hand,foot and mouth disease(HFMD) worldwide.Recent findings suggest that the recombination between CVA16 and EV71,and the co-circulation of these two viruses may have contributed to the increase of HFMD cases in China over the past few years.It is therefore important to further understand the virology,epidemiology,virus-host interactions and host pathogenesis of CVA16.In this study,we describe the viral kinetics of CVA16 in human rhabdomyosarcoma(RD) cells by analyzing the cytopathic effect(CPE),viral RNA replication,viral protein expression,viral RNA package and viral particle secretion in RD cells.We show that CVA16 appears to first attach,uncoat and enter into the host cell after adsorption for 1 h.Later on,CVA16 undergoes rapid replication from 3 to 6 h at MOI 1 and until 9 h at MOI 0.1.At MOI 0.1,CVA16 initiates a secondary infection as the virions were secreted before 9 h p.i.CPE was observed after 12 h p.i.,and viral antigen was first detected at 6 h p.i.at MOI 1 and at 9 h p.i.at MOI 0.1.Thus,our study provides important information for further investigation of CVA16 in order to better understand and ultimately control infections with this virus.
文摘本研究旨在探讨表没食子儿茶素没食子酯酸(epigallocatechin-3-gallate,EGCG)诱导人恶性淋巴瘤CA46细胞系p16基因去甲基化及转录激活的可能机制。以生长曲线、MTT法检测EGCG对CA46细胞生长和增殖的抑制作用;利用流式细胞仪DNA含量分析法探讨EGCG对CA46细胞周期的影响;采用巢式甲基特异性PCR法(nested-methylation specific PCR,n-MSP)及DNA克隆测序分析法检测EGCG作用前后CA46细胞p16基因甲基化状态;应用RT-PCR检测p16、DNA甲基转移酶(DNMT3A、DNMT3B)基因mRNA的表达。结果表明:与对照组相比,3组不同浓度EGCG均能明显抑制CA46细胞生长,G0/G1期细胞增加;不同浓度EGCG作用48小时后p16基因甲基化程度减弱;未处理组细胞p16基因呈微弱表达,未用药组、不同浓度EGCG(6、12、24)μg/ml处理组条带灰度值与β-actin1比值分别为(0.05±0.01)、(0.19±0.03)、(0.39±0.10)、(0.85±0.09),各处理组p16基因mRNA表达明显高于未用药组,其差异有显著意义(p<0.05);与对照组相比,EGCG作用48小时后CA46细胞甲基转移酶DNMT3A、DNMT3B mRNA的表达均下降。结论:EGCG可能通过抑制甲基转移酶DNMT3A、DNMT3B和(或)直接对p16基因去甲基化,使p16基因mRNA表达上调,恢复其活性,从而实现其对细胞周期的调控功能,将细胞阻滞于G0/G1期,抑制CA46细胞的增殖。
文摘目的:检测子宫内膜异位症(Endometriosis,EMT)患者血IL-16、CA199水平,评估其在诊断、病情程度中的价值研究。方法:选择我院2019年6月至2020年3月收治并行腹腔镜治疗的75例EMT患者为EMT组,根据美国生育协会分期标准分为轻度组(I~II期,40例)和重度组(III~IV期,35例);另选择同期行健康体检的75例为对照组,分别采用酶联免疫法和电化学发光免疫检测腹腔镜手术当日空腹静脉血IL-16和CA199水平,比较不同患者的表达差异;同时分析单独及联合检测在EMT中的诊断价值。结果:EMT组患者的血IL-16、CA199水平均明显高于对照组(P<0.05);EMT轻度组患者血IL-16、CA199水平均明显低于EMT重度组(P<0.05);血IL-16联合CA199检测诊断EMT的灵敏度为87.5%,特异度为79.3%,曲线下面积(Area under the curve,AUC)为0.898(95%CI:0.805~0.956)。结论:血IL-16、CA199联合检测能够提高EMT的诊断效能,且表达水平随病情严重程度增高。
