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Zhang L, Du X, Wei Q, Han Q, Chen Q, Zhang M, Xia X, Song Y, Zhang J. Development and Application of an Immunocapture PCR Diagnostic Assay Based on the Monoclonal Antibody for the Detection of Shigella. IRANIAN JOURNAL OF BIOTECHNOLOGY 2020; 18:e2244. [PMID: 32884951 PMCID: PMC7461712 DOI: 10.30498/ijb.2020.127412.2244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Background: Shigella is among the most important human pathogenic microorganisms, infecting both humans and nonhuman and causing clinically severe diarrhea. Shigella must be enriched before detection, which is time-consuming. Objectives: To develop a sensitive, rapid, and specific method for Shigella detection. Materials and Methods: Shigella was used as an antigen to generate monoclonal antibodies (mAbs). mAbs were screened via indirect enzyme-linked immunosorbent assay
(ELISA) and western blot, and two mAbs were selected. The mAb A3 showed high affinity and specificity and was used to develop immune magnetic beads (IMBs) for
Shigella enrichment. An immunocapture (IC)-PCR primer was designed from the ipaH gene, and IC-PCR was developed based on the IMBs and PCR. Results: This system shortened the Shigella detection time to 70 min. The sensitivity of the IC-PCR was 9 colony-forming units.mL-1 in artificial milk. The accuracy of the IC-PCR was confirmed using 46 clinical samples collected from monkeys. The IC-PCR results were consistent with the serological and biochemical assays. Conclusion: The IC-PCR described herein accurately detected Shigella from milk samples, monkeys and can thus be used to complement classical detection methods.
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Affiliation(s)
- Liding Zhang
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Xuewei Du
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Qiujiang Wei
- Kunming Biomed International, Kunming 650500, China
| | - Qinqin Han
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Qiang Chen
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Mi Zhang
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Xueshan Xia
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Yuzhu Song
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Jinyang Zhang
- Research Center of Molecular Medicine of Yunnan Province, Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China
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Huang L, Wei Y, Xia D, Liu D, Zhu H, Wu H, Feng L, Liu C. A broad spectrum monoclonal antibody against porcine circovirus type 2 for antigen and antibody detection. Appl Microbiol Biotechnol 2019; 103:3453-3464. [PMID: 30863876 DOI: 10.1007/s00253-019-09715-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 02/20/2019] [Accepted: 02/23/2019] [Indexed: 10/27/2022]
Abstract
This study described the production, characterization, and application of monoclonal antibodies (mAbs) against porcine circovirus type 2 (PCV2). Twelve stable hybridomas were produced by immunization with purified PCV2a/LG strain and characterized by immunoperoxidase monolayer assay (IPMA), Western blotting, and neutralization assays. All mAbs could react with the PCV2 Cap protein and neutralize PCV2a/LG strain. One of them, mAb 3A5, reacted to all PCV2 strains from PCV2a, PCV2b, and PCV2d and it could be applied to detect PCV2 antigen and antibodies. It was shown that the mAb 3A5 could be used to locate PCV2 antigen in PK15 cells and the inguinal lymph nodes of PCV2b/YJ stain-infected piglets. Furthermore, this mAb could immunoprecipitate the Cap protein in PCV2-infected PK15 cells. Meanwhile, a capture ELISA based on mAb 3A5 was developed and used to specifically test PCV2 antigen from cultures; a linear relationship was observed between the optical density at 405 nm of the ELISA and viral titers (200-12,800 TCID50/mL), with a correlation coefficient of 0.9999. Finally, a competitive ELISA based on mAb 3A5 was developed to specifically detect antibodies in PCV2-infected and immunized pigs, and its sensitivity was higher than that of the blocking ELISA. This study suggested that the mAb 3A5 could be used in several convenient and efficient methods for PCV2 clinical and pathological studies, as well as surveillance in pigs and seroconversion monitoring in the vaccinated pigs.
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Affiliation(s)
- Liping Huang
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China
| | - Yanwu Wei
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China
| | - Deli Xia
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China
| | - Dan Liu
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China
| | - Hongzhen Zhu
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China
| | - Hongli Wu
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China
| | - Li Feng
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China
| | - Changming Liu
- Swine Digestive System Infectious Diseases Research Team, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China.
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Wang YP, Huang LP, Du WJ, Wei YW, Wu HL, Feng L, Liu CM. Targeting the pseudorabies virus DNA polymerase processivity factor UL42 by RNA interference efficiently inhibits viral replication. Antiviral Res 2016; 132:219-24. [PMID: 27387827 DOI: 10.1016/j.antiviral.2016.06.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 05/31/2016] [Accepted: 06/27/2016] [Indexed: 11/15/2022]
Abstract
RNA interference (RNAi) is a conserved gene-silencing mechanism in which small interfering RNAs (siRNAs) induce the sequence-specific degradation of homologous RNAs. It has been shown to be a novel and effective antiviral therapy against a wide range of viruses. The pseudorabies virus (PRV) processivity factor UL42 can enhance the catalytic activity of the DNA polymerase and is essential for viral replication, thus it may represent a potential drug target of antiviral therapy against PRV infection. Here, we synthesized three siRNAs (siR-386, siR-517, and siR-849) directed against UL42 and determined their antiviral activities in cell culture. We first examined the kinetics of UL42 expression and found it was expressed with early kinetics during PRV replication. We verified that siR-386, siR-517, and siR-849 efficiently inhibited UL42 expression in an in vitro transfection system, thereby validating their inhibitory effects. Furthermore, we confirmed that these three siRNAs induced potent inhibitory effects on UL42 expression after PRV infection, comparable to the positive control siRNA, siR-1046, directed against the PRV DNA polymerase, the UL30 gene product, which is essential for virus replication. In addition, PRV replication was markedly reduced upon downregulation of UL42 expression. These results indicate that UL42-targeted RNAi efficiently inhibits target gene expression and impairs viral replication. This study provides a new clue for the design of an intervention strategy against herpesviruses by targeting their processivity factors.
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Affiliation(s)
- Yi-Ping Wang
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin 150001, China
| | - Li-Ping Huang
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin 150001, China
| | - Wen-Juan Du
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin 150001, China
| | - Yan-Wu Wei
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin 150001, China
| | - Hong-Li Wu
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin 150001, China
| | - Li Feng
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin 150001, China
| | - Chang-Ming Liu
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin 150001, China.
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Wang YP, Huang LP, Du WJ, Wei YW, Xia DL, Wu HL, Feng L, Liu CM. The pseudorabies virus DNA polymerase processivity factor UL42 exists as a monomer in vitro and in vivo. Arch Virol 2016; 161:1027-31. [PMID: 26733297 DOI: 10.1007/s00705-015-2735-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 12/20/2015] [Indexed: 10/22/2022]
Abstract
The processivity factors (PFs) of herpesviruses confer processivity to the DNA polymerase. Understanding whether the herpesvirus PFs function as monomers or multimers is important for clarifying the mechanism by which they provide the DNA polymerase with processivity. Herpes simplex virus type 1 UL42 is a monomer, whereas human cytomegalovirus UL44, Epstein-Barr virus BMRF1, and Kaposi's sarcoma-associated herpesvirus PF-8 exist as dimers. However, the oligomeric status of the pseudorabies virus (PRV) DNA polymerase PF UL42 has not been determined. Using fluorescence confocal microscopy and chemical crosslinking, we confirmed that UL42 is a monomer when expressed in vitro. Crosslinking of nuclear extracts from PRV-infected or uninfected PK-15 cells verified that UL42 exists as a monomer in vivo. Our demonstration that UL42 exists as a monomer in vitro and in vivo contributes to the further investigation of the mechanism used by UL42 to achieve processivity.
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Affiliation(s)
- Yi-Ping Wang
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China
| | - Li-Ping Huang
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China
| | - Wen-Juan Du
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China
| | - Yan-Wu Wei
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China
| | - De-Li Xia
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China
| | - Hong-Li Wu
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China
| | - Li Feng
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China
| | - Chang-Ming Liu
- Division of Swine Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001, People's Republic of China.
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