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Wang ZX, Chen X, Han L, Liu HD, Guo JH, Zhao Y, Sun XL. Generation and application of a monoclonal antibody against the 18-kDa oncosphere antigen of Taenia pisiformis. Exp Parasitol 2021; 224:108096. [PMID: 33741338 DOI: 10.1016/j.exppara.2021.108096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/12/2021] [Accepted: 03/07/2021] [Indexed: 11/17/2022]
Abstract
Taenia pisiformis is a parasite that causes cysticercosis pisiformis, which has acquired economic relevance because of its effects on animal welfare and production. A useful assay for the detection of T. pisiformis is needed for the prevention of cysticercosis pisiformis and control of the parasite. The 18-kDa oncosphere antigen is expressed in the oncosphere of several cysticerci in species of the genus Taenia, including T. pisiformis. This protein plays an important role in tissue invasion and has extensive applications in diagnosis. In this study, the T. pisiformis 18-kDa oncosphere antigen (TPO18) was expressed in soluble form and successfully purified for use in the production of monoclonal antibodies (MAbs) against TPO18. Twenty hybridomas were obtained using ELISA, and the subcloning process identified three positive hybridoma cell lines, which were designated as 4E8, 5G5, and 7E8. MAb 7E8 exhibited the highest titer and had an IgG2b heavy chain and a kappa light chain. Western blot analysis demonstrated that MAb 7E8 reacted with GST-TPO18. Immunohistochemistry showed that TPO18 was widely distributed in the drape and wall of uteri in adults of T. pisiformis adults and in the fibrous layer of the sucker and cyst cavity of T. pisiformis cysticerci. This research will provide a foundation for the development of diagnostic tools and will contribute to a better understanding of the functions of TPO18.
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Affiliation(s)
- Ze-Xiang Wang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu Province, 730070, People's Republic of China
| | - Xi Chen
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu Province, 730070, People's Republic of China
| | - Liang Han
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu Province, 730070, People's Republic of China
| | - Huai-Dong Liu
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu Province, 730070, People's Republic of China
| | - Jun-Hui Guo
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu Province, 730070, People's Republic of China
| | - Yu Zhao
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu Province, 730070, People's Republic of China; College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu Province 730070, People's Republic of China
| | - Xiao-Lin Sun
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, Gansu Province, 730070, People's Republic of China.
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Zhang S, Cai X, Luo X, Wang S, Guo A, Hou J, Wu R. Molecular cloning and characterization of leucine aminopeptidase gene from Taenia pisiformis. Exp Parasitol 2018; 186:1-9. [PMID: 29329981 DOI: 10.1016/j.exppara.2018.01.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 01/08/2018] [Indexed: 02/02/2023]
Abstract
Leucine aminopeptidase (LAP, EC: 3.4.11.1) is an important metalloexopeptidase that catalyze the hydrolysis of amino-terminal leucine residues from polypeptides and proteins. In this study, a full length of cDNA encoding leucine aminopeptidase of Taenia pisiformis (TpLAP) was cloned by rapid amplification of cDNA-ends using the polymerase chain reaction (RACE-PCR) method. The full-length cDNA of the TpLAP gene is 1823 bp and contains a 1569 bp ORF encoding 533 amino acids with a putative mass of 56.4 kDa. TpLAP contains two characteristic motifs of the M17LAP family in the C-terminal sequence: the metal binding site 265-[VGKG]-271 and the catalytic domain motif 351-[NTDAEGRL]-357. The soluble GST-TpLAP protein was expressed in Escherichia coli Transetta (DE3) and four specific anti-TpLAP monoclonal antibodies (mAbs) were prepared. In enzymatic assays, the optimal activity was observed at pH 9.5 at 45 °C. GST-TpLAP displayed a hydrolyzing activity for the Leu-pNA substrate with a maximum activity of 46 U/ml. The enzymatic activity was significantly enhanced by Mn2+ and completely inhibited by 20 nM bestatin and 0.15 mM EDTA. The native TpLAP was detected specifically in ES components of adult T. pisiformis by western blotting using anti-TpLAP mAb as a probe. Quantitative real-time PCR revealed that the TpLAP gene was expressed at a high level in adult worm tissues, especially in the gravid proglottids (50.71-fold). Immunolocalization analysis showed that TpLAP was located primarily in the subtegumental parenchyma zone and the uterine wall of adult worms. Our results indicate that TpLAP is a new member of the M17LAP family and can be considered as a stage-differentially expressed protein. These findings might provide new insights into the study of the mechanisms of growth, development and survival of T. pisiformis in the final host and have potential value as an attractive target for drug therapy or vaccine intervention.
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Affiliation(s)
- Shaohua Zhang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, PR China; State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, PR China
| | - Xuepeng Cai
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, PR China
| | - Xuenong Luo
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, PR China
| | - Shuai Wang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, PR China
| | - Aijiang Guo
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, PR China
| | - Junling Hou
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, PR China
| | - Run Wu
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, PR China.
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