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Li T, Xia J, Yun H, Sun G, Shen Y, Wang P, Shi J, Wang K, Yang H, Ye H. A novel autoantibody signatures for enhanced clinical diagnosis of pancreatic ductal adenocarcinoma. Cancer Cell Int 2023; 23:273. [PMID: 37974212 PMCID: PMC10655307 DOI: 10.1186/s12935-023-03107-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Accepted: 10/25/2023] [Indexed: 11/19/2023] Open
Abstract
BACKGROUND Pancreatic ductal adenocarcinoma (PDAC) is a devastating disease that requires precise diagnosis for effective treatment. However, the diagnostic value of carbohydrate antigen 19 - 9 (CA19-9) is limited. Therefore, this study aims to identify novel tumor-associated autoantibodies (TAAbs) for PDAC diagnosis. METHODS A three-phase strategy comprising discovery, test, and validation was implemented. HuProt™ Human Proteome Microarray v3.1 was used to screen potential TAAbs in 49 samples. Subsequently, the levels of potential TAAbs were evaluated in 477 samples via enzyme-linked immunosorbent assay (ELISA) in PDAC, benign pancreatic diseases (BPD), and normal control (NC), followed by the construction of a diagnostic model. RESULTS In the discovery phase, protein microarrays identified 167 candidate TAAbs. Based on bioinformatics analysis, fifteen tumor-associated antigens (TAAs) were selected for further validation using ELISA. Ten TAAbs exhibited differentially expressed in PDAC patients in the test phase (P < 0.05), with an area under the curve (AUC) ranging from 0.61 to 0.76. An immunodiagnostic model including three TAAbs (anti-HEXB, anti-TXLNA, anti-SLAMF6) was then developed, demonstrating AUCs of 0.81 (58.0% sensitivity, 86.0% specificity) and 0.78 (55.71% sensitivity, 87.14% specificity) for distinguishing PDAC from NC. Additionally, the model yielded AUCs of 0.80 (58.0% sensitivity, 86.25% specificity) and 0.83 (55.71% sensitivity, 100% specificity) for distinguishing PDAC from BPD in the test and validation phases, respectively. Notably, the combination of the immunodiagnostic model with CA19-9 resulted in an increased positive rate of PDAC to 92.91%. CONCLUSION The immunodiagnostic model may offer a novel serological detection method for PDAC diagnosis, providing valuable insights into the development of effective diagnostic biomarkers.
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Affiliation(s)
- Tiandong Li
- College of Public Health, Zhengzhou University, 450001, Zhengzhou, Henan Province, China
- Henan Key Laboratory of Tumor Epidemiology and State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Junfen Xia
- Office of Health Care, The Third Affiliated Hospital of Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Huan Yun
- Zhengzhou University, 450001, Zhengzhou, Henan Province, China
| | - Guiying Sun
- College of Public Health, Zhengzhou University, 450001, Zhengzhou, Henan Province, China
- Henan Key Laboratory of Tumor Epidemiology and State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Yajing Shen
- College of Public Health, Zhengzhou University, 450001, Zhengzhou, Henan Province, China
- Henan Key Laboratory of Tumor Epidemiology and State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Peng Wang
- College of Public Health, Zhengzhou University, 450001, Zhengzhou, Henan Province, China
- Henan Key Laboratory of Tumor Epidemiology and State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Jianxiang Shi
- Henan Key Laboratory of Tumor Epidemiology and State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
- Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Keyan Wang
- Henan Key Laboratory of Tumor Epidemiology and State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
- Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Hongwei Yang
- Department of Gastrointestinal Surgery, The First Affiliated Hospital of Zhengzhou University, 450052, Zhengzhou, Henan Province, China
| | - Hua Ye
- College of Public Health, Zhengzhou University, 450001, Zhengzhou, Henan Province, China.
- Henan Key Laboratory of Tumor Epidemiology and State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, 450052, Zhengzhou, Henan Province, China.
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Dos Santos M, Teixeira de Faria M, Oliveira da Silva J, Braga Gandra I, Julia Ribeiro A, Alves Silva K, Moreira Nogueira L, Martins Machado J, Maria da Silveira Mariano R, Maia Gonçalves AA, Ludolf F, Antonio Candia-Puma M, Chávez-Fumagalli MA, Campos-da-Paz M, Cordeiro Giunchetti R, Sobreira Galdino A. A mini-review on ELISA-Based Diagnosis of Schistosomiasis. Curr Mol Med 2023:CMM-EPUB-131492. [PMID: 37143281 DOI: 10.2174/1566524023666230504140828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 03/06/2023] [Accepted: 03/08/2023] [Indexed: 05/06/2023]
Abstract
BACKGROUND schistosomiasis is a neglected tropical parasitic disease caused by trematode worms of the genus schistosoma, which affects approximately 240 million people worldwide. the diagnosis of the disease can be performed by parasitological, molecular, and/or immunological methods, however, the development of new diagnostic methods still essential to guide policy decisions, monitor disease trends and assess the effectiveness of interventions. OBJECTIVE in this sense, the current work summarizes the findings of a systematic review regarding antigens applied in the enzyme-linked immunosorbent assay test, which were patented and published over the last ten years. METHODS the literature search strategy used medical subject heading (mesh) terms to define as descriptors. "schistosoma mansoni" was used in arrangement with the descriptors "immunoassay", "enzyme-linked immunosorbent assay", "elisa", and "antigens", using the "and" connector. the patent search was done using keywords, including diagnosis and schistosoma or schistosomiasis or schistosome. several databases were employed for the patent search, such as intellectual property national institute; european patent office; the united states patent and trademark office; patent scope, and google patents. RESULTS forty-one articles were retrieved, of which only five met the eligibility criteria. seventeen patents were taken from the databases, and a brief description of the most relevant inventions is given here. CONCLUSION schistosomiasis is considered the most important helminthic disease in worldwide. therefore, it is important to of searching for and develops diagnostic methods based on serology to reduce morbidity and mortality caused by the disease.
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Affiliation(s)
- Michelli Dos Santos
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Mariana Teixeira de Faria
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Jonatas Oliveira da Silva
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Isadora Braga Gandra
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Anna Julia Ribeiro
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Kamila Alves Silva
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Lais Moreira Nogueira
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Juliana Martins Machado
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Reysla Maria da Silveira Mariano
- Laboratório de Biologia das Interações Celulares, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil
| | - Ana Alice Maia Gonçalves
- Laboratório de Biologia das Interações Celulares, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil
| | - Fernanda Ludolf
- Programa de Pós-graduação em Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, 30130-100, Minas Gerais, Brazil
| | - Mayron Antonio Candia-Puma
- Computational Biology and Chemistry Research Group, Vicerrectorado de Investigación, Universidad Católica de Santa María, Urb. San José S/N, Umacollo, Arequipa 04000, Peru
| | - Miguel Angel Chávez-Fumagalli
- Computational Biology and Chemistry Research Group, Vicerrectorado de Investigación, Universidad Católica de Santa María, Urb. San José S/N, Umacollo, Arequipa 04000, Peru
| | - Mariana Campos-da-Paz
- Laboratório de Bioativos & NanoBiotecnologia, Universidade Federal de São João Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
| | - Rodolfo Cordeiro Giunchetti
- Laboratório de Biologia das Interações Celulares, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil
| | - Alexsandro Sobreira Galdino
- Laboratório de Biotecnologia de Microrganismos, Universidade Federal de São Joao Del-Rei, Sebastião Gonçalves Coelho, 400, 35501-296, Divinópolis, MG, Brazil
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Siqueira WF, Cardoso MS, Clímaco MDC, Silva ALT, Heidt B, Eersels K, van Grinsven B, Bartholomeu DC, Bueno LL, Cleij T, Fujiwara RT. Serodiagnosis of leishmaniasis in asymptomatic and symptomatic dogs by use of the recombinant dynamin-1-like protein from Leishmania infantum: A preliminary study. Acta Trop 2023; 239:106827. [PMID: 36610530 DOI: 10.1016/j.actatropica.2023.106827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/23/2022] [Accepted: 01/03/2023] [Indexed: 01/06/2023]
Abstract
Visceral leishmaniasis (VL) is a fatal manifestation of an infection caused by intracellular protozoa of the Leishmania genus. In New World countries, VL is classified as a zoonotic disease with domestic dogs acting as its main reservoir. Asymptomatic dogs are as competent to transmit Leishmania to the vectors as symptomatic dogs, however current diagnostic tests are limited and present low sensitivity for this important group. The development of accurate tests is fundamental to the early diagnosis, treatment, and control of canine leishmaniasis. In this study, we investigated the use of a recombinant protein (dynamin-1-like protein, Dyn-1) from L. infantum, as a potential target antigen for leishmaniasis serodiagnosis in both symptomatic and asymptomatic dogs. The antigenic performance of the protein was evaluated by means of ELISA assays using sera from symptomatic (n = 25), asymptomatic (n = 34) and non-infected dogs (n = 36) using ELISA. In addition, sera from dogs experimentally infected with Trypanosoma cruzi (n = 49) and naturally infected with Babesia sp. (n = 8) were tested to evaluate possible cross-reactivity. A crude soluble antigen (CSA) of Leishmania was used as an antigen control and K39 and K26 were used as reference antigens because they are already widely used in commercial tests. rDyn-1-based assay showed the highest sensitivity (97%) compared to the antigens K39 (88%), K26 (86%) and crude extract (95%). The highest specificity among the tests was also obtained with the protein rDyn-1 (94%), compared with the other antigens K39 (81%), K26 (87%), and crude extract (77%). This study showed that the rDyn-1 ELISA assay was able to identify 100% of asymptomatic dogs, establishing its potential as a target for the diagnosis of canine leishmaniasis.
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Affiliation(s)
- Williane Fernanda Siqueira
- Programa de Pós-graduação em Ciências da Saúde: Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil; Sensor Engineering Department, Faculty of Science and Engineering, Maastricht University, Maastricht, Limburg, Netherlands
| | - Mariana Santos Cardoso
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil
| | - Marianna de Carvalho Clímaco
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil
| | | | - Benjamin Heidt
- Sensor Engineering Department, Faculty of Science and Engineering, Maastricht University, Maastricht, Limburg, Netherlands
| | - Kasper Eersels
- Sensor Engineering Department, Faculty of Science and Engineering, Maastricht University, Maastricht, Limburg, Netherlands
| | - Bart van Grinsven
- Sensor Engineering Department, Faculty of Science and Engineering, Maastricht University, Maastricht, Limburg, Netherlands
| | - Daniella Castanheira Bartholomeu
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil
| | - Lilian Lacerda Bueno
- Programa de Pós-graduação em Ciências da Saúde: Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil; Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil
| | - Thomas Cleij
- Sensor Engineering Department, Faculty of Science and Engineering, Maastricht University, Maastricht, Limburg, Netherlands
| | - Ricardo Toshio Fujiwara
- Programa de Pós-graduação em Ciências da Saúde: Infectologia e Medicina Tropical, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil; Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil.
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Mesa-Arango JA, Olave-Velandia AM, García-Montoya GM, Isaza-Agudelo JP, Jiménez-Ruiz A, Alzate JF. Evaluation of new Toxocara canis chimeric antigens as an alternative to conventional TES-Ag for anti- Toxocara antibodies detection. Heliyon 2022; 8:e11144. [PMID: 36299519 PMCID: PMC9589186 DOI: 10.1016/j.heliyon.2022.e11144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 07/01/2022] [Accepted: 10/13/2022] [Indexed: 11/06/2022] Open
Abstract
Human toxocariasis is one of the neglected helminthiases and it is caused by the zoonotic roundworm species Toxocara canis and Toxocara cati. Diagnosis of human toxocariasis is based on the combination of clinical, parasitological, and epidemiological criteria, as well as serology tests that detect anti-Toxocara antibodies. Notwithstanding, due to the absence of pathognomonic symptoms and signs of the disease, serology is the key evidence to support a conclusive diagnosis. TES-ELISA is the most widely used serological test for diagnosis. However, cross-reaction of TES antigens with antibodies produced to other helminth antigens is a major drawback for its application in countries with high parasitic prevalence. T. canis recombinant antigens have been described as an alternative to native TES for diagnosis. Nevertheless, the selection of antigenic proteins is a complex process that requires validation. In this paper, we developed an eGFP carrier-based system to express and purify blocks of recombinant polypeptides of T. canis antigenic proteins. Intense cross-reaction polypeptides were detected by Immunoblot and avoided to finally produce a chimeric prototype protein. Additionally, a control chimeric protein that harbors the complete tested proteins was produced. Purified chimeric antigens were tested in ELISA and Immunoblot assays with 310 sera samples of negative and positive control individuals. Our results showed that chimeric rCHITC0 and rCHITC1 antigens (with sensitivities of 62% 58%, 38% and 16% in IB-rCHITC0, ELISA-rCHITC0, ELISA-rCHITC1 and IB-rCHITC1 respectively for OLMS) can perform better in terms of specificity (being 91%, 89%, 87% and 76% for ELISA-rCHITC1, IB-rCHITC1, ELISA-rCHITC0 and IB-rCHITC0 respectively for OLMS) than T. canis TES-ELISA (with 61% specificity), giving a higher signal with serum samples of infected individuals as well the possibility to discriminate false positive cases with other parasitic infections. Our data suggest that T. canis chimeric proteins, represent candidate antigens for phase II studies.
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Affiliation(s)
- Jairo A. Mesa-Arango
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Ana M. Olave-Velandia
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Gisela M. García-Montoya
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Juan P. Isaza-Agudelo
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Antonio Jiménez-Ruiz
- Departamento de Biología de Sistemas, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
| | - Juan F. Alzate
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Corresponding author.
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da Silva MB, Fernandes AMS, da Silva ES, Urrego JR, Santiago LF, Garcés LFS, Portela RD, Pacheco LGC, Briza P, Ferreira F, Pinheiro CS, Alcantara-Neves NM. Proteomics and immunoblotting analyses reveal antigens that optimize the immunodiagnosis of the infection by Toxocara spp. Transbound Emerg Dis 2022; 69:e2994-e3006. [PMID: 35801561 DOI: 10.1111/tbed.14650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 06/11/2022] [Accepted: 06/21/2022] [Indexed: 12/01/2022]
Abstract
BACKGROUND Toxocariasis is an infection caused by the round worms Toxocara canis and Toxocara cati. It occurs worldwide though it is more prevalent in developing countries. For the diagnosis of toxocariasis, the most used method is the indirect enzyme-linked immunosorbent assay (indirect ELISA), based on the detection of specific antibodies using the excreted/secreted products from T. canis larvae (TES) as antigens, but it cross-reacts with several helminth infections. For this reason, there is a need to investigate species-specific immunoreactive proteins, which can be used for the development of a more sensitive and specific diagnosis. OBJECTIVE To investigate immunoreactive protein candidates to be used for the development of a more sensitive and specific diagnosis of Toxocara spp. infection in humans. METHODS We have used immunoblotting and mass spectrometry to select four Toxocara canis immunoreactive proteins that were recombinantly expressed in bacteria and evaluated as potential new diagnostic antigens (rMUC3, rTES 26, rTES32 and rCTL4). The recognition of these recombinant proteins by total serum IgG and IgG4 was assayed using the purified proteins in an isolated manner or in combination. RESULTS The IgG ELISAs performed with individual recombinant antigens reached values of sensitivity and specificity that ranged from 91.7% to 97.3% and 94.0% to 97.9%, respectively. Among the analyses, the IgG4 immunoassay was proven to be more effective, revealing a sensitivity that ranged from 88.8% to 98.3% and a specificity of 97.8% to 97.9%. The IgG4 ELISA was shown to be more effective and presented no cross-reactivity when using combinations of the rTES 26 and rCTL4 recombinant proteins. The combination of these two molecules achieved 100% sensitivity and specificity. CONCLUSIONS The use of only two recombinant proteins can contribute to improve the current panorama of toxocariasis immunodiagnosis for, with a better optimization and reduced cost. This article is protected by copyright. All rights reserved.
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Affiliation(s)
| | | | | | - Juan Ricardo Urrego
- Department of Pharmaceutical Sciences, University of Cartagena, Cartagena, Colombia
| | | | | | - Ricardo Dias Portela
- Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador, Bahia, Brazil
| | - Luis G C Pacheco
- Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador, Bahia, Brazil
| | - Peter Briza
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Fátima Ferreira
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Carina Silva Pinheiro
- Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador, Bahia, Brazil
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Chong HY, Leow CY, Leow CH. Generation of soluble, disulfide-rich JEV NS1 protein recognizable by anti-NS1 antibodies through a simplified, in vitro refolding approach. Int J Biol Macromol 2021; 185:485-493. [PMID: 34174313 DOI: 10.1016/j.ijbiomac.2021.06.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/20/2021] [Accepted: 06/21/2021] [Indexed: 12/01/2022]
Abstract
Co-existence of Japanese Encephalitis virus (JEV) with highly homologous antigenic epitopes results in antibody-based serodiagnosis being inaccurate at detecting and distinguishing JEV from other flaviviruses. This often causes misdiagnosis and inefficient treatments of flavivirus infection. Generation of JEV NS1 protein remains a challenge as it is notably expressed in the form of inactive aggregates known as inclusion bodies using bacterial expression systems. This study evaluated two trxB and gor E. coli strains in producing soluble JEV NS1 via a cold-shock expression system. High yield of JEV NS1 inclusion bodies was produced using cold-shocked expression system. Subsequently, a simplified yet successful approach in generating soluble, active JEV NS1 protein through solubilization, purification and in vitro refolding of JEV NS1 protein from inclusion bodies was developed. A step-wise dialysis refolding approach was used to facilitate JEV NS1 refolding. The authenticity of the refolded JEV NS1 was confirmed by specific antibody binding on indirect ELISA commercial anti-NS1 antibodies which showed that the refolded JEV NS1 was highly immunoreactive. This presented approach is cost-effective, and negates the need for mammalian or insect cell expression systems in order to synthesize this JEV NS1 protein of important diagnostic and therapeutic relevance in Japanese Encephalitis disease.
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Affiliation(s)
- Hui Ying Chong
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Glugor, Penang, Malaysia
| | - Chiuan Yee Leow
- School of Pharmaceutical Science, Universiti Sains Malaysia, Glugor, Penang, Malaysia
| | - Chiuan Herng Leow
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Glugor, Penang, Malaysia.
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Cascardo P, Pucu E, Leles D. REVIEW OF PARASITES FOUND IN EXTINCT ANIMALS: WHAT CAN BE REVEALED. J Parasitol 2021; 107:275-283. [PMID: 33844838 DOI: 10.1645/20-30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Parasitism is inherent to life and observed in all species. Extinct animals have been studied to understand what they looked like, where and how they lived, what they fed on, and the reasons they became extinct. Paleoparasitology helps to clarify these questions based on the study of the parasites and microorganisms that infected those animals, using as a source material coprolites, fossils in rock, tissue, bone, mummy, and amber, analyses of ancient DNA, immunodiagnosis, and microscopy.
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Affiliation(s)
- Paula Cascardo
- Laboratório de Biologia Molecular de Parasitos, Departamento de Microbiologia e Parasitologia, Instituto Biomédico, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 21041-210, Brazil
| | - Elisa Pucu
- Laboratório de Biologia Molecular de Parasitos, Departamento de Microbiologia e Parasitologia, Instituto Biomédico, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 21041-210, Brazil
| | - Daniela Leles
- Laboratório de Biologia Molecular de Parasitos, Departamento de Microbiologia e Parasitologia, Instituto Biomédico, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 21041-210, Brazil
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Dastan K, Assmar M, Amirmozafari N, Ghanaei FM, Mirpour M. Design, Expression and Purification of Strongyloides stercoralis IgG4 Immunoreactive Protein (NIE) in Escherichia coli. Iran J Parasitol 2020; 15:341-348. [PMID: 33082798 PMCID: PMC7548455 DOI: 10.18502/ijpa.v15i3.4198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Background Strongyloidiasis is a public health concern in northern regions of Iran, caused by Strongyloides stercoralis. Auto-infection cycle can be resulted in high parasitic load, especially in immunocompromised hosts. Because of low sensitivity of stool culture and stool-based microscopy techniques, detection of antibodies in patient's sera can be an alternative diagnostic technique for detection of the nematode. In the present study, as the first step of the development of an ELISA kit for the detection of antibodies against the nematode, IgG4 immunoreactive protein (NIE) was expressed in Escherichia coli expression system, purified and verified. Methods The NIE gene sequence was retrieved from the GenBank. This sequence was codon-optimized for the expression in E. coli BL21 (DE3). The sequence was inserted into the expression vector pET-30b (+). The recombinant vector was then transferred into competent E. coli BL21 (DE3). Transformed colonies were selected and verified by colony PCR. NIE gene expression was induced with IPTG induction. The protein production was evaluated by SDS-PAGE and verified using Western blotting. Results The codon-optimized NIE gene had required parameters for expression in E. coli. NIE protein was proved and verified by SDS-PAGE and Western blotting. Conclusion NIE recombinant protein was successfully expressed in E. coli expression system in appropriate amounts. The recombinant protein can be used for developing ELISA kit in diagnosis of S. stercoralis.
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Affiliation(s)
- Katayoun Dastan
- Department of Microbiology, Faculty of Basic Sciences, Lahijan Branch, Islamic Azad University, Lahijan, Iran
| | - Mehdi Assmar
- Department of Microbiology, Faculty of Basic Sciences, Lahijan Branch, Islamic Azad University, Lahijan, Iran.,Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Nour Amirmozafari
- Department of Microbiology, Faculty of Basic Sciences, Lahijan Branch, Islamic Azad University, Lahijan, Iran.,Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Fariborz Mansour Ghanaei
- Division of Gastroenterology, Faculty of Medicine, Gilan University of Medical Sciences, Gilan, Iran.,Gastrointestinal and Liver Disease Research Center, Razi Hospital, Rasht, Iran
| | - Mirsasan Mirpour
- Department of Microbiology, Faculty of Basic Sciences, Lahijan Branch, Islamic Azad University, Lahijan, Iran
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9
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Cognato BB, Handali S, de Mattos Pereira L, Barradas JR, Januário da Silva A, Graeff-Teixeira C, Morassutti AL. Identification of cross-reactive markers to strengthen the development of immunodiagnostic methods for angiostrongyliasis and other parasitic infections. Exp Parasitol 2020; 218:107999. [PMID: 32956649 DOI: 10.1016/j.exppara.2020.107999] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 08/30/2020] [Accepted: 09/13/2020] [Indexed: 10/23/2022]
Abstract
Angiostrongylus cantonensis is the main causative agent of eosinophilic meningoencephalitis (EoM) in humans. Molecular diagnostic methods are essential since the identification of larvae in cerebrospinal fluid (CSF) is extremely rare. To date, the detection of a 31 kDa antigen by Western blotting has been the primary immunodiagnostic method for EoM caused by A. cantonensis. However, cross-reactivity with other parasites has been observed. Therefore, we conducted a comparative analysis using sera from individuals with angiostrongyliasis. We also characterized proteins isolated from different cellular sources of A. cantonensis, Toxocara canis, Schistosoma mansoni, and Strongyloides stercoralis with mass spectrometry. A total of 115 cross-reactive proteins were identified. Three of these proteins, heat shock protein, an intermediate filament protein, and galectin 1, represent potential markers for cross-reactivity. In addition, synthetic peptides were generated from previously identified diagnostic targets and tested against sera from individuals infected with several other parasites. As a result, two other markers of cross-reactivity were identified: peptide #4 derived from the 14-3-3 protein and peptide #12 derived from the Lec-5 protein. In contrast, 34 proteins were exclusively present in the Angiostrongylus extracts and represent promising diagnostic molecules for specific identification of A. cantonensis infection. In particular, cytochrome oxidase subunit I is of great interest as a possible immunodiagnostic target for angiostrongyliasis.
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Affiliation(s)
- Bianca B Cognato
- Laboratório de Parasitologia Molecular, Instituto de Pesquisas Biomédicas and Laboratório de Biologia Parasitaria, Faculdade de Biociências da Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, 90690-900, Porto Alegre, RS, Brazil
| | - Sukwan Handali
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, 1600 Clifton Road, MS D-64, Bldg 23, Room 9-440, Atlanta, GA, 30329, USA
| | - Leandro de Mattos Pereira
- Laboratório de Parasitologia Molecular, Instituto de Pesquisas Biomédicas and Laboratório de Biologia Parasitaria, Faculdade de Biociências da Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, 90690-900, Porto Alegre, RS, Brazil; FATEC, Faculdade de Teologia e Ciências, Rua José Sanches Peres, 3040, 15501-210, Votuporanga, SP, Brazil
| | - José Ricardo Barradas
- Laboratório de Parasitologia Molecular, Instituto de Pesquisas Biomédicas and Laboratório de Biologia Parasitaria, Faculdade de Biociências da Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, 90690-900, Porto Alegre, RS, Brazil
| | - Alexandre Januário da Silva
- U.S. Food and Drug Administration, Center for Foods Safety and Applied Nutrition, Office of Applied Research and Safety Assessment, Division of Food and Environmental Microbiology, USA
| | - Carlos Graeff-Teixeira
- Laboratório de Parasitologia Molecular, Instituto de Pesquisas Biomédicas and Laboratório de Biologia Parasitaria, Faculdade de Biociências da Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, 90690-900, Porto Alegre, RS, Brazil
| | - Alessandra L Morassutti
- Laboratório de Parasitologia Molecular, Instituto de Pesquisas Biomédicas and Laboratório de Biologia Parasitaria, Faculdade de Biociências da Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, 90690-900, Porto Alegre, RS, Brazil.
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10
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Cheong WS, Leow CY, Abdul Majeed AB, Leow CH. Diagnostic and therapeutic potential of shark variable new antigen receptor (VNAR) single domain antibody. Int J Biol Macromol 2020; 147:369-375. [PMID: 31926922 PMCID: PMC7112388 DOI: 10.1016/j.ijbiomac.2020.01.039] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 01/05/2020] [Accepted: 01/05/2020] [Indexed: 12/29/2022]
Abstract
Conventional monoclonal antibodies (mAbs) have been widely used in research and diagnostic applications due to their high affinity and specificity. However, multiple limitations, such as large size, complex structure and sensitivity to extreme ambient temperature potentially weaken the performance of mAbs in certain applications. To address this problem, the exploration of new antigen binders is extensively required in relation to improve the quality of current diagnostic platforms. In recent years, a new immunoglobulin-based protein, namely variable domain of new antigen receptor (VNAR) was discovered in sharks. Unlike conventional mAbs, several advantages of VNARs, include small size, better thermostability and peculiar paratope structure have attracted interest of researchers to further explore on it. This article aims to first present an overview of the shark VNARs and outline the characteristics as an outstanding new reagent for diagnostic and therapeutic applications.
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Affiliation(s)
- Wei Shien Cheong
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Gelugor, Penang, Malaysia
| | - Chiuan Yee Leow
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
| | | | - Chiuan Herng Leow
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Gelugor, Penang, Malaysia.
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11
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Silva-Junior LC, Fontes KFLP, Nascimento SA, Rodriguez MC, Camargos MF, Freitas AC, Castro RS, Jesus ALS. Development of a DIVA ELISA for diagnosis of Aujeszky's disease using recombinant gE fused to thioredoxin as antigen. Vet J 2020; 257:105448. [PMID: 32546352 DOI: 10.1016/j.tvjl.2020.105448] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 01/26/2020] [Accepted: 03/04/2020] [Indexed: 11/26/2022]
Abstract
The major control methods for Aujeszky's Disease (AD) involve SHV1 gE gene-deleted vaccines and ELISA for detection of specific gE antibodies in infected animals, distinguishing infected animals from vaccinated animals (DIVA). This work aimed to develop a DIVA ELISA recombinant gE (gErec) for AD diagnosis using recombinant gE fused to thioredoxin protein. The analytical sensitivity and specificity were assessed with World Organisation for Animal Health (OIE) AD serum and sera from specific pathogen free (SPF), vaccinated SPF and AD-vaccinated SPF animals. The OIE serum reacted up to the recommended limit of detection and the other sera presented negative results. The cut-off point, diagnostic sensitivity and diagnostic specificity were determined by receiver operating curve analysis. This cut-off value corresponded to a diagnostic sensitivity of 97.60% and diagnostic specificity of 96.42%. Furthermore, two other cut-off points were chosen to discuss the ELISAgErec as a screening test in AD-endemic and free areas.
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Affiliation(s)
- Luiz C Silva-Junior
- Departamento de Medicina Veterinaria, Universidade Federal Rural de Pernambuco, Recife, PE, 52171-900, Brazil
| | - Karin F L P Fontes
- Departamento de Medicina Veterinaria, Universidade Federal Rural de Pernambuco, Recife, PE, 52171-900, Brazil
| | - Sérgio A Nascimento
- Departamento de Medicina Veterinaria, Universidade Federal Rural de Pernambuco, Recife, PE, 52171-900, Brazil
| | - Maria C Rodriguez
- Laboratorio de Virologia Animal, Centro de Diagnostico 'Marcos Enrietti' (CDME), Curitiba, PR, 80.040-340, Brazil
| | - Marcelo F Camargos
- Laboratorio de Diagnostico de Doenças Virais, Laboratorio Federal de Defesa Agropecuaria, Pedro Leopoldo, MG, 33600-000, Brazil
| | - Antonio C Freitas
- Departamento de Genetica, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil
| | - Roberto S Castro
- Departamento de Medicina Veterinaria, Universidade Federal Rural de Pernambuco, Recife, PE, 52171-900, Brazil.
| | - André L S Jesus
- Departamento de Medicina Veterinaria, Universidade Federal Rural de Pernambuco, Recife, PE, 52171-900, Brazil; Departamento de Genetica, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil.
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12
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Bosqui LR, Corral MA, Levy D, Bydlowski SP, Gryschek RCB, Custodio LA, Pavanelli WR, Conchon-Costa I, Costa-Cruz JM, de Paula FM, Costa IN. Evaluation of the Dot-ELISA as a diagnostic test for human strongyloidiasis based on the detection of IgA in saliva. Acta Trop 2020; 203:105305. [PMID: 31862463 DOI: 10.1016/j.actatropica.2019.105305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 12/03/2019] [Accepted: 12/16/2019] [Indexed: 11/21/2022]
Abstract
This study aimed to evaluate the use of saliva samples in the Dot-ELISA test for immunodiagnosis of human strongyloidiasis. The Dot-ELISA presented similar results to the ELISA test, with 70% and 60% sensitivity and 85% and 90% specificity, respectively, for IgA in the saliva. The Dot-ELISA with alternative saliva samples may be a suitable tool for diagnosing human strongyloidiasis, especially in populations with high levels of exposure to helminth.
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13
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Nhancupe N, Noormahomed EV, Afonso S, Svard S, Lindh J. Further evaluation of recombinant Tsol-p27 by enzyme-linked immunoelectrotransfer blot for the serodiagnosis of cysticercosis in pigs from Mozambique. Parasit Vectors 2019; 12:564. [PMID: 31775845 PMCID: PMC6880384 DOI: 10.1186/s13071-019-3816-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Accepted: 11/20/2019] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Porcine cysticercosis has a negative impact on human health and the meat industry, as it makes infected meat unaproprieted for consuption and it is the main etiology of epileptic seizures in developing countries. There are multiple serological assays that use crude antigens with high sensitivity and specificity for the diagnosis of both porcine and human cysticercosis. Nonetheless, antigen preparation is time-consuming, needs a well-equipped laboratory and trained personnel and places those manipulating the meat at great risk for infection. New serodiagnostic approaches to the diagnosis of porcine and human cysticercosis have been directed towards the development of recombinant deoxyribonucleic acid technology for the generation of synthetic proteins that can serve as simplified, low-cost and harmless substitutes for native antigens. The aim of the present study was to further evaluate the recombinant Tsol-p27 protein as a target molecule in immunoassays for the serodiagnosis of porcine cysticercosis. From these data, we hoped to develop recommendations regarding its use in the serodiagnosis of porcine cysticercosis. RESULTS We studied a panel of 83 naturally infected pig sera from Angónia District, Mozambique, an endemic area for porcine and human cysticercosis. These sera were previously tested by antigen enzyme-linked immunosorbent assay (Ag-ELISA) to detect antigens of T. solium. The serum panel was processed by enzyme-linked immunoelectrotransfer blot (EITB) assay against the recombinant Tsol-p27 protein and the Ag-ELISA assay results were used to compare and evaluate the performance of Tsol-p27 for the diagnosis of cysticercosis. Out of 83 sera, 24 (29.0%) were positive for Tsol-p27 and 59 (71%) were negative in the same assay. From the 37 sera that tested positive to Ag-ELISA, 11 (13.3%) were positive to Tsol-p27, while from 46 sera that tested negative to Ag-ELISA, 33 (39.7%) also tested negative to Tsol-p27. The sensitivity and specificity of Tsol-p27 was 29.7% and 71.7%, respectively, while the positive predictive value and negative predictive value were 45.8% and 55.9%, respectively, as calculated using Medcalc® version 15.0 software (MedCalc Software, Ostend, Belgium). CONCLUSION While Tsol-p27 recombinant protein might be suitable for testing human sera, its performance in pigs is not acceptable, so other recombinant proteins should be evaluated alone or multiplexed.
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Affiliation(s)
- Noemia Nhancupe
- grid.8295.6Department of Microbiology, Faculty of Medicine, Eduardo Mondlane University, Maputo, Mozambique ,0000 0004 1936 9457grid.8993.bDepartment of Cell and Molecular Biology, BMC, Uppsala University, Uppsala, Sweden
| | - Emilia V. Noormahomed
- grid.8295.6Department of Microbiology, Faculty of Medicine, Eduardo Mondlane University, Maputo, Mozambique ,0000 0001 2107 4242grid.266100.3Department of Medicine, Infectious Disease Division, University of California, San Diego, USA ,Mozambique Institute for Health Education and Research (MIHER), Maputo, Mozambique
| | - Sonia Afonso
- grid.8295.6Department of Clinics, Veterinary Faculty, Eduardo Mondlane University, Maputo, Mozambique
| | - Staffan Svard
- 0000 0004 1936 9457grid.8993.bDepartment of Cell and Molecular Biology, BMC, Uppsala University, Uppsala, Sweden
| | - Johan Lindh
- 0000 0004 1936 9457grid.8993.bDepartment of Cell and Molecular Biology, BMC, Uppsala University, Uppsala, Sweden
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14
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de Faria LS, de Souza DLN, Ribeiro RP, de Sousa JEN, Borges IP, Ávila VMR, Ferreira-Júnior Á, Goulart LR, Costa-Cruz JM. Highly specific and sensitive anti-Strongyloides venezuelensis IgY antibodies applied to the human strongyloidiasis immunodiagnosis. Parasitol Int 2019; 72:101933. [PMID: 31128257 DOI: 10.1016/j.parint.2019.101933] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 04/12/2019] [Accepted: 05/21/2019] [Indexed: 12/20/2022]
Abstract
Due to the epidemiological problem of the neglected condition of human strongyloidiasis, rapid and effective diagnosis is extremely important, with the development of new diagnostic tools being essential to reduce infections and chronic cases. Avian immunoglobulin Y (IgY) technology is an alternative for antibody production that has high specificity and profitability. This study aimed to produce and fractionate IgY antibodies from the egg yolks of hens that were immunized with the total antigenic extracts of Strongyloides venezuelensis infectious filariform larvae (iL3) and parthenogenetic females (pF). IgY antibodies were then evaluated by their recognition of antigenic proteins, evolutive helminth forms, and serological diagnosis of human strongyloidiasis by the detection of immune complexes in serum samples. Egg yolks were fractionated to obtain IgY antibodies by thiophilic interaction chromatography. Immune complex detection in serum samples showed diagnostic values for anti-iL3 IgY and anti-pF IgY antibodies at 95.56% and 88.89% sensitivity and 95.56% and 91.11% specificity, respectively. Therefore, IgY technology is a promising tool for the detection of blood circulating Strongyloides antigens, with possible application as a serological diagnostic method.
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Affiliation(s)
- Lucas S de Faria
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará 1720, Uberlândia, Minas Gerais 38400-902, Brazil
| | - Dayane L N de Souza
- Laboratório de Bioquímica e Toxinas Animais, Instituto de Genética e Bioquímica, Universidade Federal de Uberlândia, Av. Pará 1720, Uberlândia, Minas Gerais 38400-902, Brazil
| | - Raphaella P Ribeiro
- Programa de Pós-Graduação em Sanidade e Produção Animal nos Trópicos, Universidade de Uberaba, Campus Aeroporto. Av. Nenê Sabino, sala 2D05,Uberaba, Minas Gerais 38055-500, Brazil
| | - José Eduardo N de Sousa
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará 1720, Uberlândia, Minas Gerais 38400-902, Brazil
| | - Isabela P Borges
- Laboratório de Bioquímica e Toxinas Animais, Instituto de Genética e Bioquímica, Universidade Federal de Uberlândia, Av. Pará 1720, Uberlândia, Minas Gerais 38400-902, Brazil
| | - Veridiana M R Ávila
- Laboratório de Bioquímica e Toxinas Animais, Instituto de Genética e Bioquímica, Universidade Federal de Uberlândia, Av. Pará 1720, Uberlândia, Minas Gerais 38400-902, Brazil
| | - Álvaro Ferreira-Júnior
- Programa de Pós-Graduação em Sanidade e Produção Animal nos Trópicos, Universidade de Uberaba, Campus Aeroporto. Av. Nenê Sabino, sala 2D05,Uberaba, Minas Gerais 38055-500, Brazil
| | - Luiz Ricardo Goulart
- Laboratório de Nanobiotecnologia, Instituto de Genética e Bioquímica, Universidade Federal de Uberlândi, Av Pará 1720, Uberlândia, Minas Gerais 38400-902, Brazil
| | - Julia M Costa-Cruz
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará 1720, Uberlândia, Minas Gerais 38400-902, Brazil.
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15
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Felicetti CPD, Sinnott F, Monte LG, Leal K, Conceição FR, Berne MEA, Borsuk S. Diagnostic Potential of Anti-RTE30 Polyclonal Antibodies In A Blocking Elisa For Toxocara canis Detection. J Parasitol 2019; 105:64-68. [PMID: 30807721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023] Open
Abstract
The main etiologic agent of human toxocariasis, a zoonotic disease, is the helminth Toxocara canis. Among the diagnostics used for human toxocariasis, ELISA using T. canis excretion and secretion antigen (TES) is considered as a standard technique. TES antigen requires the cultivation of T. canis larvae, which makes its production difficult. Besides this, the use of TES antigen does not eliminate the cross-reactions with other similar proteins that are produced by other intestinal worms. In this context, recombinant antigens are being tested to improve the diagnosis of human toxocariasis. Herein, we describe the production of polyclonal antibodies against recombinant protein TES30 (pAb-rTES30) and evaluate its use in a blocking ELISA (b-ELISA) using human sera. The b-ELISA showed 95.6% sensitivity and 94.4% specificity. Thus, the b-ELISA using pAb-rTES30 offers a viable option for toxocariasis diagnosis owing to its configuration, which prevents cross-reactivity with non-species-specific antibodies.
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Affiliation(s)
- Cristiane Pires Dias Felicetti
- 1 Laboratório de Biotecnologia Infecto-Parasitária, Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas, CEP 96010-900, Pelotas, Rio Grande do Sul, Brazil
| | - Francine Sinnott
- 1 Laboratório de Biotecnologia Infecto-Parasitária, Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas, CEP 96010-900, Pelotas, Rio Grande do Sul, Brazil
| | - Leonardo Garcia Monte
- 2 Laboratório de Imunodiagnóstico, Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas, CEP 96010-900, Pelotas, Rio Grande do Sul, Brazil
| | - Karen Leal
- 1 Laboratório de Biotecnologia Infecto-Parasitária, Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas, CEP 96010-900, Pelotas, Rio Grande do Sul, Brazil
| | - Fabrício Rochedo Conceição
- 3 Laboratório de Imunologia Aplicada, Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas, CEP 96010-900, Pelotas, Rio Grande do Sul, Brazil
| | - Maria Elizabeth Aires Berne
- 4 Laboratório de Parasitologia, Instituto de Biologia, Universidade Federal de Pelotas, CEP 96010-900, Pelotas, Rio Grande do Sul, Brazil
| | - Sibele Borsuk
- 1 Laboratório de Biotecnologia Infecto-Parasitária, Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas, CEP 96010-900, Pelotas, Rio Grande do Sul, Brazil
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16
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Marohnic CC, Birkenmeyer LG, Bogdan MF, Frias EC, Otis KS, Palafox MAP, McSherry TD, Gregory SD, Zhao C, Gutierrez RA, Prostko JC, Muerhoff AS. Engineering of the hepatitis C virus helicase for enhanced seroreactivity. J Virol Methods 2018; 264:11-17. [PMID: 30381240 DOI: 10.1016/j.jviromet.2018.10.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 10/24/2018] [Accepted: 10/25/2018] [Indexed: 10/28/2022]
Abstract
Hepatitis C Virus c33, a recombinant protein comprising residues 1192-1457 of NS3 helicase, has been a mainstay of HCV serology for decades. With seven unpaired cysteines, seroreactivity of E. coli expressed c33 is dependant on reductants. While engineering a c33 replacement for new anti-HCV serological tests, we sought to reduce oxidation sensitivity, a liability for immunodiagnostic reagent stability. A series of cysteine-to-serine substituted variants of a c33-like antigen was constructed and evaluated for reactivity against a panel of HCV-positive sera. Several variants were essentially nonreactive while others exhibited reactivity similar to or better than the wild-type construct. One demonstrated equivalent potency to wild-type but also diminished DTT dependence. To explore enhanced anti-NS3 reactivity, we constructed and examined an expanded series of antigens comprising individual helicase domains, the full-length helicase, additional cysteine-to-serine variants, and variants at positions critical to catalytic activity. Immunoassays using these latter NS3 helicase recombinants demonstrated that domain 1 possessed significantly more seroreactivity than previously believed, that the use of soluble full-length helicase protein enhanced sensitivity by several-fold over c33, and that anti-NS3 helicase seroreactivity was further enhanced by the introduction of point mutations which altered the catalytic activity or oxidation sensitivity of the antigen.
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Affiliation(s)
- Christopher C Marohnic
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA.
| | - Larry G Birkenmeyer
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - M Felicia Bogdan
- Abbott Laboratories, Diagnostics Division, Research and Development Process Design, Abbott Park, IL, USA
| | - Edwin C Frias
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - Kathy S Otis
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - Mary Ann P Palafox
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - Troy D McSherry
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - Svetoslava D Gregory
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - Cheng Zhao
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - Robin A Gutierrez
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - John C Prostko
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
| | - A Scott Muerhoff
- Abbott Laboratories, Diagnostics Division, Applied Research and Technology, Abbott Park, IL, USA
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17
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da Silva MC, Schaefer R, Gava D, Souza CK, da Silva Vaz I Jr, Bastos AP, Venancio EJ. Production and application of anti-nucleoprotein IgY antibodies for influenza A virus detection in swine. J Immunol Methods. 2018;461:100-105. [PMID: 30158073 DOI: 10.1016/j.jim.2018.06.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/16/2018] [Accepted: 06/29/2018] [Indexed: 02/06/2023]
Abstract
Influenza A virus (IAV) causes an important respiratory disease in mammals and birds leading to concerns in animal production industry and public health. Usually, antibodies produced in mammals are employed in diagnostic tests. However, due to animal welfare concerns, technical advantages and the high cost of production, alternatives to the production of antibodies in mammals have been investigated. The aim of this study was to produce egg yolk immunoglobulin (IgY) in laying hens against a highly conserved protein (nucleoprotein- NP) of IAV and to evaluate the application of anti-NP IgY antibodies in virus detection by immunocytochemistry (ICC) and immunohistochemistry (IHC). Three laying hens of the White Leghorn line were inoculated seven times with a recombinant NP protein and their eggs collected seven days after the 3rd, 5th and 7th inoculations. Immunoglobulin Y antibodies were purified from egg yolk through precipitation with ammonium sulfate. The titers and specificity of the purified antibodies were determined by ELISA, western blotting, ICC and IHC. High levels of specific anti-NP antibodies were detected by ELISA after the 5th inoculation, reaching a peak after the 7th inoculation. The mean yield of total protein in yolk after the 7th inoculation was 13.5 mg/mL. The use of western blotting and ICC demonstrated that anti-NP IgY binds specifically to NP protein. Moreover, the use of anti-NP IgY antibody in ICC test revealed positive staining of MDCK cells infected with IAV of the three subtypes circulating in swine (H1N1, H1N2, and H3N2). However, no staining was observed in lung tissues through the IHC test. The data obtained showed that anti-NP IgY antibodies bound specifically to influenza virus NP protein, detecting the main virus subtypes circulating in swine, reinforcing their usefulness in the influenza diagnosis.
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18
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Kearney BJ, Voorhees MA, Williams PL, Olschner SP, Rossi CA, Schoepp RJ. Corning HYPERFlask ® for viral amplification and production of diagnostic reagents. J Virol Methods 2016; 242:9-13. [PMID: 28012899 DOI: 10.1016/j.jviromet.2016.12.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/16/2016] [Accepted: 12/19/2016] [Indexed: 11/27/2022]
Abstract
Viral preparations are essential components in diagnostic research and development. The production of large quantities of virus traditionally is done by infecting numerous tissue culture flasks or roller bottles, which require large incubators and/or roller bottle racks. The Corning HYPERFlask® is a multilayer flask that uses a gas permeable film to provide gas exchange between the cells and culture medium and the atmospheric environment. This study evaluated the suitability of the HYPERFlask for production of Lassa, Ebola, Bundibugyo, Reston, and Marburg viruses and compared it to more traditional methods using tissue culture flasks and roller bottles. The HYPERFlask produced cultures were equivalent in virus titer and indistinguishable in immunodiagnostic assays. The use of the Corning HYPERFlask for viral production is a viable alternative to traditional tissue culture flasks and roller bottles. HYPERFlasks allow for large volumes of virus to be produced in a small space without specialized equipment.
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Affiliation(s)
- Brian J Kearney
- Diagnostic Systems Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, MD, 21702, United States
| | - Matthew A Voorhees
- Diagnostic Systems Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, MD, 21702, United States
| | - Priscilla L Williams
- Ke'aki Technologies, LLC, 1425 Porter Street, Fort Detrick, MD, 21702, United States
| | - Scott P Olschner
- Diagnostic Systems Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, MD, 21702, United States
| | - Cynthia A Rossi
- Diagnostic Systems Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, MD, 21702, United States
| | - Randal J Schoepp
- Diagnostic Systems Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, MD, 21702, United States.
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19
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Cope FO, Abbruzzese B, Sanders J, Metz W, Sturms K, Ralph D, Blue M, Zhang J, Bracci P, Bshara W, Behr S, Maurer T, Williams K, Walker J, Beverly A, Blay B, Damughatla A, Larsen M, Mountain C, Neylon E, Parcel K, Raghuraman K, Ricks K, Rose L, Sivakumar A, Streck N, Wang B, Wasco C, Schlesinger LS, Azad A, Rajaram MVS, Jarjour W, Young N, Rosol T, Williams A, McGrath M. The inextricable axis of targeted diagnostic imaging and therapy: An immunological natural history approach. Nucl Med Biol 2016; 43:215-25. [PMID: 26924502 PMCID: PMC4794336 DOI: 10.1016/j.nucmedbio.2015.11.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 11/13/2015] [Accepted: 11/16/2015] [Indexed: 12/30/2022]
Abstract
In considering the challenges of approaches to clinical imaging, we are faced with choices that sometimes are impacted by rather dogmatic notions about what is a better or worse technology to achieve the most useful diagnostic image for the patient. For example, is PET or SPECT most useful in imaging any particular disease dissemination? The dictatorial approach would be to choose PET, all other matters being equal. But is such a totalitarian attitude toward imaging selection still valid? In the face of new receptor targeted SPECT agents one must consider the remarkable specificity and sensitivity of these agents. (99m)Tc-Tilmanocept is one of the newest of these agents, now approved for guiding sentinel node biopsy (SLNB) in several solid tumors. Tilmanocept has a Kd of 3×10(-11)M, and it specificity for the CD206 receptor is unlike any other agent to date. This coupled with a number of facts, that specific disease-associated macrophages express this receptor (100 to 150 thousand receptors), that the receptor has multiple binding sites for tilmanocept (>2 sites per receptor) and that these receptors are recycled every 15 min to bind more tilmanocept (acting as intracellular "drug compilers" of tilmanocept into non-degraded vesicles), gives serious pause as to how we select our approaches to diagnostic imaging. Clinically, the size of SLNs varies greatly, some, anatomically, below the machine resolution of SPECT. Yet, with tilmanocept targeting, the SLNs are highly visible with macrophages stably accruing adequate (99m)Tc-tilmanocept counting statistics, as high target-to-background ratios can compensate for spatial resolution blurring. Importantly, it may be targeted imaging agents per se, again such as tilmanocept, which may significantly shrink any perceived chasm between the imaging technologies and anchor the diagnostic considerations in the targeting and specificity of the agent rather than any lingering dogma about the hardware as the basis for imaging approaches. Beyond the elements of imaging applications of these agents is their evolution to therapeutic agents as well, and even in the neo-logical realm of theranostics. Characteristics of agents such as tilmanocept that exploit the natural history of diseases with remarkably high specificity are the expectations for the future of patient- and disease-centered diagnosis and therapy.
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Affiliation(s)
- Frederick O Cope
- Navidea Biopharmaceuticals, Drug Development, 5600 Blazer Parkway, Dublin, OH 43017.
| | - Bonnie Abbruzzese
- Navidea Biopharmaceuticals, Drug Development, 5600 Blazer Parkway, Dublin, OH 43017
| | - James Sanders
- Navidea Biopharmaceuticals, Drug Development, 5600 Blazer Parkway, Dublin, OH 43017
| | - Wendy Metz
- Navidea Biopharmaceuticals, Drug Development, 5600 Blazer Parkway, Dublin, OH 43017
| | - Kristyn Sturms
- Navidea Biopharmaceuticals, Drug Development, 5600 Blazer Parkway, Dublin, OH 43017
| | - David Ralph
- Navidea Biopharmaceuticals, Drug Development, 5600 Blazer Parkway, Dublin, OH 43017
| | - Michael Blue
- Navidea Biopharmaceuticals, Drug Development, 5600 Blazer Parkway, Dublin, OH 43017
| | - Jane Zhang
- The University of California San Francisco and the San Francisco General Hospital, AIDS and Cancer Specimen Resource Center, The Department of Pathology, 1001 Potrero Ave, Bldg. 3, Rm 207 San Francisco, CA 94110
| | - Paige Bracci
- The University of California San Francisco and the San Francisco General Hospital, AIDS and Cancer Specimen Resource Center, The Department of Pathology, 1001 Potrero Ave, Bldg. 3, Rm 207 San Francisco, CA 94110
| | - Wiam Bshara
- Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263
| | - Spencer Behr
- Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263
| | - Toby Maurer
- Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263
| | - Kenneth Williams
- Boston College, Department of Biology, 14 Commonwealth Ave, Chestnut Hill, Massachusetts 02467
| | - Joshua Walker
- Boston College, Department of Biology, 14 Commonwealth Ave, Chestnut Hill, Massachusetts 02467
| | - Allison Beverly
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Brooke Blay
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Anirudh Damughatla
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Mark Larsen
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Courtney Mountain
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Erin Neylon
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Kaeli Parcel
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Kapil Raghuraman
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Kevin Ricks
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Lucas Rose
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Akhilesh Sivakumar
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Nicholas Streck
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Bryan Wang
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Christopher Wasco
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | | | | | | | | | | | | | - Amifred Williams
- Navidea Biopharmaceuticals Drug Development Internship Program, 5600 Blazer Parkway, Dublin, OH 43017
| | - Michael McGrath
- The University of California San Francisco and the San Francisco General Hospital, AIDS and Cancer Specimen Resource Center, The Department of Pathology, 1001 Potrero Ave, Bldg. 3, Rm 207 San Francisco, CA 94110
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Bosqui LR, Gonçalves ALR, Gonçalves-Pires MDRF, Custodio LA, de Menezes MCND, Murad VA, de Paula FM, Pavanelli WR, Conchon-Costa I, Costa-Cruz JM, Costa IN. Detection of parasite-specific IgG and IgA in paired serum and saliva samples for diagnosis of human strongyloidiasis in northern Paraná state, Brazil. Acta Trop 2015; 150:190-5. [PMID: 26238982 DOI: 10.1016/j.actatropica.2015.07.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 07/28/2015] [Accepted: 07/29/2015] [Indexed: 01/04/2023]
Abstract
Human strongyloidiasis is an infection caused by the helminth Strongyloides stercoralis that can be fatal, especially in immunosuppressed patients. The aim of this study is to evaluate parasite-specific IgG and IgA levels using S. venezuelensis third-stage (L3) infective larvae alkaline extract as a heterologous antigen by ELISA in paired serum and saliva samples with improved sensitivity and specificity. Individuals from northern Paraná state, Brazil were divided into three groups: 30 patients copropositive for S. stercoralis (Group I); 30 clinically healthy individuals (Group II); and 30 patients copropositive for other parasites (Group III). The area under ROC curve (AUC), an overall index of diagnostic accuracy, and Kappa index were calculated. Data were analyzed using analysis of variance (ANOVA) followed by a Kruskal-Wallis test. Probability (p) values of <0.05 were regarded as significant. In Group I, IgG was detected in 96.7% serum and in 6.7% saliva samples. IgG was not detected in Group II. In Group III, cross-reactivity was observed for serum IgG in 26.7% and in 6.7% for saliva samples. In Group I, IgA was detected in 76.7% serum and 56.7% saliva samples. In Group II, 3.3% were positive for IgA in serum, whereas IgA was not detected in any saliva samples. Group III showed 6.7% serum and 26.7% saliva-positive samples. The sensitivity values for detection of IgG and IgA in serum samples were 96.7% and 76.7%, respectively. In saliva samples, the sensitivity values for detection of IgG and IgA were 6.7% and 56.7%, respectively. The specificity value was 100% for the detection of IgG in serum and for detection of IgG and IgA in saliva, and 96.7% for detection of IgA in serum samples. The proper choice of immunological diagnosis to supplement parasitological methods is essential to estimate the true prevalence of the parasite, and will permit analysis of population immune response profiles, particularly in northern Paraná state, where there are no previous reports.
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Affiliation(s)
- Larissa R Bosqui
- Departamento de Ciências Patológicas, Laboratório de Parasitologia, Universidade Estadual de Londrina, PR, Brazil
| | - Ana Lúcia R Gonçalves
- Departamento de Imunologia, Microbiologia e Parasitologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, MG, Brazil
| | - Maria do Rosário F Gonçalves-Pires
- Departamento de Imunologia, Microbiologia e Parasitologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, MG, Brazil
| | | | - Maria Cláudia N D de Menezes
- Departamento de Ciências Patológicas, Laboratório de Parasitologia, Universidade Estadual de Londrina, PR, Brazil
| | - Valter A Murad
- Ambulatório de Especialidades do Hospital Universitário de Londrina, PR, Brazil
| | - Fabiana M de Paula
- Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, SP, Brazil
| | - Wander R Pavanelli
- Departamento de Ciências Patológicas, Laboratório de Parasitologia, Universidade Estadual de Londrina, PR, Brazil
| | - Ivete Conchon-Costa
- Departamento de Ciências Patológicas, Laboratório de Parasitologia, Universidade Estadual de Londrina, PR, Brazil
| | - Julia Maria Costa-Cruz
- Departamento de Imunologia, Microbiologia e Parasitologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, MG, Brazil
| | - Idessania N Costa
- Departamento de Ciências Patológicas, Laboratório de Parasitologia, Universidade Estadual de Londrina, PR, Brazil.
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21
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de Oliveira ES, Silva KR, Fernando FS, Gonçalves MCM, Fernandes CC, Borzi MM, dos Santos RM, Tamanini MDLF, Montassier MDFDS, Montassier HJ. A liquid-phase-blocking concanavalin A enzyme-linked immunosorbent assay for the detection of antibodies against Newcastle disease virus in serum of free-ranging pigeons. J Vet Diagn Invest 2013; 25:720-6. [PMID: 24100439 DOI: 10.1177/1040638713503656] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A competitive liquid-phase-blocking concanavalin A enzyme-linked immunosorbent assay (LPB-ConA-ELISA) was developed in the current study. The assay used ConA as a capture reagent, and the sera of specific pathogen-free chickens immunized with nonpurified Newcastle disease virus (NDV) suspension as detector antibodies, to detect and quantify specific antiviral antibodies in serum samples from free-ranging pigeons. The comparison between the LPB-ConA-ELISA and the hemagglutination inhibition (HI) test for the detection of antibodies in serum samples from 107 pigeons showed significant correlation between the assays (r = 0.875), a high sensitivity (100%), specificity (95.8%), accuracy (96.3%) for the ELISA, and good agreement (κ = 0.83) between the 2 assays. The results of this study suggest that the LPB-ConA-ELISA could be a useful alternative to HI test in the serodiagnosis of NDV in pigeons, or other species of birds.
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Affiliation(s)
- Elisabete Schirato de Oliveira
- 1Elisabete Schirato de Oliveira, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Via de Acesso Paulo Donato Castellane, s/n, 14884-900 Jaboticabal, São Paulo, Brazil.
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