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Sengupta PP, Rudramurthy GR, Ligi M, Jacob SS, Rahman H, Roy P. Development of an antigen ELISA using monoclonal antibodies against recombinant VSG for the detection of active infections of Trypanosoma evansi in animals. Vet Parasitol 2019; 266:63-66. [PMID: 30736948 DOI: 10.1016/j.vetpar.2018.12.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 12/06/2018] [Accepted: 12/10/2018] [Indexed: 11/27/2022]
Abstract
Trypanosoma evansi, a haemo-flagellated protozoan parasite causes chronic wasting disease in a wide range of animals. For its diagnosis, blood smear examination is useful in clinical cases for direct identification of the parasite but in latent infection the carrier animals are difficult to screen out by conventional blood smear test. Harboring low level of parasites and showing no symptom, the carrier animals for surra can act as a source of infection. The level of parasitaemia fluctuates, especially during latent infection; moreover the antibodies which are not found early in the infection may persist even after recovery or chemotherapy. In the present study a double antibody sandwich ELISA exploring, monoclonal antibodies and hyperimmune serum, raised against recombinant variable surface glycoprotein has been developed to detect circulating trypanosome antigens. The developed antigen detection ELISA (Ag-ELISA) was evaluated using 652 blood samples collected from cattle, buffalo, equine and camel. The statistical analysis of the data showed diagnostic sensitivity and specificity at 97.4% and 96.4% respectively, with a positive-negative cut-off OD value >0.28. Furthermore, the detection limit of the assay was found to 7.15 trypanosomes per mL. The present finding revealed that the developed assay can be exploited as a potential diagnostic test in the detection of circulating trypanosome antigens and also can be used as a population screening test for multiple animal species for detection of active infection for further treatment and control of the disease.
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Affiliation(s)
- P P Sengupta
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, Yelahanka, Bengaluru, 560064, Karnataka, India.
| | - G R Rudramurthy
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, Yelahanka, Bengaluru, 560064, Karnataka, India
| | - M Ligi
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, Yelahanka, Bengaluru, 560064, Karnataka, India
| | - S S Jacob
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, Yelahanka, Bengaluru, 560064, Karnataka, India
| | - H Rahman
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, Yelahanka, Bengaluru, 560064, Karnataka, India
| | - P Roy
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, Yelahanka, Bengaluru, 560064, Karnataka, India
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Antigen detection ELISA: A sensitive and reliable tool for the detection of active infection of surra. Acta Trop 2018; 187:23-27. [PMID: 30053383 DOI: 10.1016/j.actatropica.2018.07.018] [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: 02/17/2018] [Revised: 06/06/2018] [Accepted: 07/23/2018] [Indexed: 11/23/2022]
Abstract
Trypanosomosis, an endemic disease in Asia, America (central and south) and Africa causes havoc economical loss in livestock industry. The carrier animals which are symptomless and harbours low level of parasites can act as a source of infection. The level of parasitaemia fluctuates, especially during the latent infection; moreover the antibodies which are not found early in the infection may persit even after recovery or chemotherapy. The parasitological and/or serological tests always can not detect current infection or carrier animals. Hence, in the present study double antibody sandwitch antigen detection ELISA (Ag-ELISA) is developed to detect circulating trypanosomes. The new assay has been evaluated using 554 field samples comprising bovine and camel. The diagnostic sensitivity and specificity of the new assay was found to be 97.4% and 99.0% respectively, with a Cohen's kappa value of 0.96. The developed assay could detect 11.5 Trypanosoma evansi per mL from the experimentally infected blood, buffy coat and purified T. evansi samples. The findings revealed that the developed assay can be exploited as a potential diagnostic tool in the detection of active trypanosomal infection.
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Development and evaluation of recombinant antigen and monoclonal antibody based competition ELISA for the sero- surveillance of surra in animals. J Immunol Methods 2018; 460:87-92. [DOI: 10.1016/j.jim.2018.06.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 06/05/2018] [Accepted: 06/21/2018] [Indexed: 12/30/2022]
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Rudramurthy GR, Sengupta PP, Ligi M, Rahman H. An inhibition enzyme immuno assay exploring recombinant invariant surface glycoprotein and monoclonal antibodies for surveillance of surra in animals. Biologicals 2017; 46:148-152. [PMID: 28233669 DOI: 10.1016/j.biologicals.2017.02.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 01/17/2017] [Accepted: 02/06/2017] [Indexed: 10/20/2022] Open
Abstract
The present study is aimed at the development of inhibition ELISA (I-ELISA) exploring monoclonal antibodies (MAbs) and recombinant invariant surface glycoprotein. The extracellular domain (ED) of invariant surface glycoprotein (ISG-75) from Trypanosoma evasni has been heterologously expressed in Pichia pastoris (X-33). The recombinant ISG-75 (rISG-75ED) was characterized by immunoblot and ELISA, followed by the production of MAbs against rISG-75ED. The MAbs were characterized by immunoblot and then explored in the development of I-ELISA for the detection of surra. The diagnostic potential of the developed test has been evaluated using 1192 field sera sample including cattle, buffalo, donkey, horse and camel. The statistical analysis of the data showed optimum combination of diagnostic sensitivity and specificity at 98.8% and 99.2% respectively, with cut-off percentage inhibition (PI) value of >45. The Cohen's kappa coefficient of agreement was found to be 0.98. Hence, the diagnostic test developed in the present study can be exploited as a potential and reliable tool in the serodiagnosis and surveillance of surra in animals.
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Affiliation(s)
- G R Rudramurthy
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, P.B.No. 6450, Yelahanka, Bengaluru 560064, Karnataka, India
| | - P P Sengupta
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, P.B.No. 6450, Yelahanka, Bengaluru 560064, Karnataka, India.
| | - M Ligi
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, P.B.No. 6450, Yelahanka, Bengaluru 560064, Karnataka, India
| | - H Rahman
- National Institute of Veterinary Epidemiology and Disease Informatics (NIVEDI), Ramagondanahalli, P.B.No. 6450, Yelahanka, Bengaluru 560064, Karnataka, India
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Bosompem KM, Arishima T, Yamashita T, Ayi I, Anyan WK, Kojima S. Extraction of Schistosoma haematobium antigens from infected human urine and generation of potential diagnostic monoclonal antibodies to urinary antigens. Acta Trop 1996; 62:91-103. [PMID: 8988310 DOI: 10.1016/s0001-706x(96)00040-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Proteins in Schistosoma haematobium infected human urine were concentrated by precipitation with saturated ammonium sulphate 50% (v/v) and various fractions obtained at different stages of precipitation tested for presence of schistosome antigens (ShAgs) by dot-ELISA. The protein fraction (UP2S) obtained following two-times precipitation was found to contain high concentrations of ShAg. Fraction UP2S was dialysed against phosphate-buffered saline (pH 7.4) and further purified by Sephadex G-200 column chromatography. Two protein peaks were eluted of which the first peak UP2S(pkI) was found to contain high concentrations of ShAgs as determined by microplate-ELISA. The second peak UP2S(pkII) consisted of human urine proteins. Further analysis of UP2S(pkI) revealed that ShAgs were mainly in the form of immune complexes with human IgG, IgM, IgA, IgE and complement C3. The ShAgs in both UP2S and UP2S(pkI) were found to be active as they induced immune responses in mice which produced antibodies reactive with S. haematobium worm as well as soluble egg antigens (SEA). Pure ShAgs were obtained from UP2S following dissociation of immune complexes with a carbonate buffer (pH 11.42) and further purification on Sephadex G-200. Immunizations with UP2S led to the generation of MoAbs which could bind both SEA and UP2S.
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Affiliation(s)
- K M Bosompem
- Parasitology Unit, Noguchi Memorial Institute for Medical Research, Accra, Ghana
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