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Rapid Detection of Avian Influenza Virus by Fluorescent Diagnostic Assay using an Epitope-Derived Peptide
Theranostics ( IF 12.4 ) Pub Date : 2017-04-10 , DOI: 10.7150/thno.18857
Duong Tuan Bao , Do Thi Hoang Kim , Hyun Park , Bui Thi Cuc , Nguyen Minh Ngoc , Nguyen Thi Phuong Linh , Nguyen Chien Huu , Trinh Thi Thuy Tien , Nguyen Thi Viet Anh , Tung Dao Duy , Chom-Kyu Chong , Seung-Taek Yu , Do-Young Choi , Seon-Ju Yeo

Currently, the point of care testing (POCT) is not fully developed for subtype-specific avian influenza virus detection. In this study, an H5N1 hemaglutinin 1 (HA1) epitope (P0: KPNDAINF) and three modified peptides (P1: KPNTAINF, P2: KPNGAINF, P3: KPNDAINDAINF) were evaluated as POCT elements for rapid detection of avian influenza virus. Based on modeling predictions by Autodock Vina, binding affinity varied depending on alteration of one amino acid in these peptides. The binding energy of P2 indicated its potential for a strong interaction with HA. Fluorescence-linked immunosorbent assay experimentally demonstrated the interaction between these peptides and virus. The four peptides interacted with HA1 of H5N3 with different binding affinities with P2 showing the strongest binding affinity. When P0 and P2 peptides were used in rapid fluorescent immunochromatographic test (FICT) as detection elements, the inter-assay coefficients of variation (CV) indicated that P2-linked FICT was more acceptable than the P0-linked FICT in the presence of human specimens. Antibody pair-linked FICT was influenced by clinical samples more than the P2-linked FICT assay, which showed a 4-fold improvement in the detection limit of H5N3 and maintained H5 subtype-specificity. Compared to the rapid diagnostic test (RDT) which is not specific for influenza subtypes, P2-linked FICT could increase virus detection. In conclusion, results of this study suggest that HA epitope-derived peptides can be used as alternatives to antibodies for a rapid fluorescent diagnostic assay to detect avian influenza virus.

中文翻译:

使用表位衍生肽的荧光诊断分析快速检测禽流感病毒

当前,针对亚型特异性禽流感病毒检测的即时检验(POCT)尚未完全开发。在这项研究中,H5N1血凝素1(HA1)表位(P0:KPNDAINF)和三个修饰的肽(P1:KPNTAINF,P2:KPNGAINF,P3:KPNDAINDAINF)被评估为POCT元素,可快速检测禽流感病毒。基于Autodock Vina的建模预测,结合亲和力随这些肽中一个氨基酸的变化而变化。P2的结合能表明其与HA发生强相互作用的潜力。荧光连接的免疫吸附试验通过实验证明了这些肽与病毒之间的相互作用。这四个肽以不同的结合亲和力与H5N3的HA1相互作用,P2显示出最强的结合亲和力。当将P0和P2肽用于快速荧光免疫色谱测试(FICT)作为检测元素时,批间变异系数(CV)表明,在存在人类标本的情况下,P2连接的FICT比P0连接的FICT更可接受。抗体对连接的FICT受临床样品的影响要大于P2连接的FICT检测,这表明H5N3的检出限提高了4倍,并保持了H5亚型特异性。与不是专门针对流感亚型的快速诊断测试(RDT)相比,与P2相关联的FICT可以提高病毒检测率。总之,这项研究的结果表明,HA表位衍生的肽可以用作抗体的替代品,用于快速荧光诊断检测禽流感病毒。批间变异系数(CV)表明,在存在人类标本的情况下,P2联结的FICT比P0联结的FICT更容易接受。抗体对连接的FICT受临床样品的影响要大于P2连接的FICT检测,这表明H5N3的检出限提高了4倍,并保持了H5亚型特异性。与不是专门针对流感亚型的快速诊断测试(RDT)相比,与P2相关联的FICT可以提高病毒检测率。总之,这项研究的结果表明,HA表位衍生的肽可以用作抗体的替代品,用于快速荧光诊断检测禽流感病毒。批间变异系数(CV)表明,在存在人类样品的情况下,P2联结的FICT比P0联结的FICT更容易接受。抗体对连接的FICT受临床样品的影响要大于P2连接的FICT检测,这表明H5N3的检出限提高了4倍,并保持了H5亚型特异性。与不是专门针对流感亚型的快速诊断测试(RDT)相比,与P2相关联的FICT可以提高病毒检测率。总之,这项研究的结果表明,HA表位衍生的肽可以用作抗体的替代品,用于快速荧光诊断检测禽流感病毒。抗体对连接的FICT受临床样品的影响要大于P2连接的FICT检测,这表明H5N3的检出限提高了4倍,并保持了H5亚型特异性。与不是专门针对流感亚型的快速诊断测试(RDT)相比,与P2相关联的FICT可以提高病毒检测率。总之,这项研究的结果表明,HA表位衍生的肽可以用作抗体的替代品,用于快速荧光诊断检测禽流感病毒。抗体对连接的FICT受临床样品的影响要大于P2连接的FICT检测,这表明H5N3的检出限提高了4倍,并保持了H5亚型特异性。与不是专门针对流感亚型的快速诊断测试(RDT)相比,与P2相关联的FICT可以提高病毒检测率。总之,这项研究的结果表明,HA表位衍生的肽可以用作抗体的替代品,用于快速荧光诊断检测禽流感病毒。
更新日期:2017-07-01
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