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Araújo Pereira MO, Júnior ÁF, Batista Rodrigues ES, Mulser H, Nascimento de Mello E Silva G, Pio Dos Santos WT, de Souza Gil E. An impedimetric immunosensor for diagnosis of Brazilian spotted fever in blood plasma. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:189-195. [PMID: 38098444 DOI: 10.1039/d3ay01308a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Brazilian spotted fever (BSF) is a serious disease of medical importance due to its rapid evolution and high lethality. The effectiveness of the treatment mainly depends on the rapid diagnosis, which is currently performed by indirect immunofluorescence and PCR tests, which require high costs and laboratory structure. In order to propose an alternative methodology, we sought to develop an impedimetric immunosensor (IM) based on the immobilization of specific IgY antibodies for IgG anti Rickettsia rickettsii, using blood plasma from capybara (Hydrochoerus hydrochaeris), for characterization, validation and applications of the ready IM. IM selectivity was observed when comparing capybara reagent IgG (IgGcr) readings with non-reagent IgG (IgGnr). A reagent IgG calibration curve was obtained, from which the limits of detection (LOD) and quantification (LOQ) of 1.3 ng mL-1 and 4.4 ng mL-1 were calculated, respectively. The accuracy tests showed that different concentrations of IgGcr showed a maximum deviation of 20.0%, with CI between 90.00% and 95.00%. Intermediate precision tests showed a relative standard deviation of 2.09% for researcher 1 and 2.61% for researcher 2, and the F test showed no significant difference between the recovery values found between the two analysts, since Fcal 1.56 < 5.05 and P-value 0.48 > 0, 05. Therefore, an impedimetric immunosensor was developed to detect anti BSF IgG in capybara blood plasma, which greatly contributes to the improvement of diagnostic tests, cost reduction and ease of execution.
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Affiliation(s)
| | | | | | - Helena Mulser
- School of Pharmacy, Federal University of Goiás, Brazil.
| | | | - Wallans Torres Pio Dos Santos
- Chemistry Department, Federal University of Vales do Jequitinhonha e Mucuri, Campus JK, 39100000, Diamantina, Minas Gerais, Brazil
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Gonçalves MN, Lopes DS, Teixeira SC, Teixeira TL, de Freitas V, Costa TR, Gimenes SNC, de Camargo IM, de Souza G, da Silva MS, Azevedo FVPDV, Grego KF, Santos LC, Oliveira VQ, da Silva CV, Rodrigues RS, Yoneyama KAG, Clissa PB, Rodrigues VDM. Antileishmanial effects of γCdcPLI, a phospholipase A2 inhibitor from Crotalus durissus collilineatus snake serum, on Leishmania (Leishmania) amazonensis. Mem Inst Oswaldo Cruz 2023; 118:e220225. [PMID: 38018570 PMCID: PMC10690931 DOI: 10.1590/0074-02760220225] [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: 09/28/2022] [Accepted: 11/01/2023] [Indexed: 11/30/2023] Open
Abstract
BACKGROUND Leishmaniasis, a neglected disease caused by the parasite Leishmania, is treated with drugs associated with high toxicity and limited efficacy, in addition to constant reports of the emergence of resistant parasites. In this context, snake serums emerge as good candidates since they are natural sources with the potential to yield novel drugs. OBJECTIVES We aimed to show the antileishmanial effects of γCdcPLI, a phospholipase A2 inhibitor from Crotalus durissus collilineatus snake serum, against Leishmania (Leishmania) amazonensis. METHODS Promastigotes forms were exposed to γCdcPLI, and we assessed the parasite viability and cell cycle, as well as invasion and proliferation assays. FINDINGS Despite the low cytotoxicity effect on macrophages, our data indicate that γCdcPLI has a direct effect on parasites promoting an arrest in the G1 phase and reduction in the G2/M phase at the highest dose tested. Moreover, this PLA2 inhibitor reduced the parasite infectivity when promastigotes were pre-treated. Also, we demonstrated that the γCdcPLI treatment modulated the host cell environment impairing early and late steps of the parasitism. MAIN CONCLUSIONS γCdcPLI is an interesting tool for the discovery of new essential targets on the parasite, as well as an alternative compound to improve the effectiveness of the leishmaniasis treatment.
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Affiliation(s)
- Marina Neves Gonçalves
- Universidade Federal de Uberlândia, Instituto de Biotecnologia,
Laboratório de Bioquímica e Toxinas Animais, Uberlândia, MG, Brasil
| | - Daiana Silva Lopes
- Universidade Federal de Uberlândia, Instituto de Biotecnologia,
Laboratório de Bioquímica e Toxinas Animais, Uberlândia, MG, Brasil
- Universidade Federal da Bahia, Instituto de Biociências, Vitória da
Conquista, BA, Brasil
| | - Samuel Cota Teixeira
- Universidade Federal de Uberlândia, Instituto de Ciências
Biomédicas, Departamento de Imunologia, Uberlândia, MG, Brasil
| | - Thaise Lara Teixeira
- Universidade Federal de São Paulo, Escola Paulista de Medicina,
Departamento de Microbiologia, Imunologia e Parasitologia, São Paulo, SP,
Brasil
| | - Vitor de Freitas
- Universidade Federal de Uberlândia, Instituto de Biotecnologia,
Laboratório de Bioquímica e Toxinas Animais, Uberlândia, MG, Brasil
| | - Tássia Rafaella Costa
- Universidade Federal de Uberlândia, Instituto de Biotecnologia,
Laboratório de Bioquímica e Toxinas Animais, Uberlândia, MG, Brasil
| | | | | | - Guilherme de Souza
- Universidade Federal de Uberlândia, Instituto de Ciências
Biomédicas, Departamento de Imunologia, Uberlândia, MG, Brasil
| | - Marcelo Santos da Silva
- Universidade de São Paulo, Instituto de Química, Departamento de
Bioquímica, São Paulo, SP, Brasil
| | | | | | - Luísa Carregosa Santos
- Universidade Federal da Bahia, Instituto de Biociências, Vitória da
Conquista, BA, Brasil
| | | | - Claudio Vieira da Silva
- Universidade Federal de Uberlândia, Instituto de Ciências
Biomédicas, Departamento de Imunologia, Uberlândia, MG, Brasil
| | - Renata Santos Rodrigues
- Universidade Federal de Uberlândia, Instituto de Biotecnologia,
Laboratório de Bioquímica e Toxinas Animais, Uberlândia, MG, Brasil
| | - Kelly Aparecida Geraldo Yoneyama
- Universidade Federal de Uberlândia, Instituto de Biotecnologia,
Laboratório de Bioquímica e Toxinas Animais, Uberlândia, MG, Brasil
| | | | - Veridiana de Melo Rodrigues
- Universidade Federal de Uberlândia, Instituto de Biotecnologia,
Laboratório de Bioquímica e Toxinas Animais, Uberlândia, MG, Brasil
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Pacheco BLB, Nogueira CP, Venancio EJ. IgY Antibodies from Birds: A Review on Affinity and Avidity. Animals (Basel) 2023; 13:3130. [PMID: 37835736 PMCID: PMC10571861 DOI: 10.3390/ani13193130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 09/29/2023] [Accepted: 10/04/2023] [Indexed: 10/15/2023] Open
Abstract
IgY antibodies are found in the blood and yolk of eggs. Several studies show the feasibility of utilising IgY for immunotherapy and immunodiagnosis. These antibodies have been studied because they fulfil the current needs for reducing, replacing, and improving the use of animals. Affinity and avidity represent the strength of the antigen-antibody interaction and directly influence antibody action. The aim of this review was to examine the factors that influence the affinity and avidity of IgY antibodies and the methodologies used to determine these variables. In birds, there are few studies on the maturation of antibody affinity and avidity, and these studies suggest that the use of an adjuvant-type of antigen, the animal lineage, the number of immunisations, and the time interfered with the affinity and avidity of IgY antibodies. Regarding the methodologies, most studies use chaotropic agents to determine the avidity index. Studies involving the solution phase and equilibrium titration reactions are also described. These results demonstrate the need for the standardisation of methodologies for the determination of affinity and avidity so that further studies can be performed to optimise the production of high avidity IgY antibodies.
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Affiliation(s)
| | - Camila Parada Nogueira
- Scientific Initiation Programme, Animal Science Course, State University of Londrina, Londrina 86038-350, Brazil;
| | - Emerson José Venancio
- Department of Pathological Sciences, State University of Londrina, Londrina 86038-350, Brazil
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Falcon RMG, Caoili SEC. Immunologic, genetic, and ecological interplay of factors involved in allergic diseases. FRONTIERS IN ALLERGY 2023; 4:1215616. [PMID: 37601647 PMCID: PMC10435091 DOI: 10.3389/falgy.2023.1215616] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 07/24/2023] [Indexed: 08/22/2023] Open
Abstract
An allergic or type I hypersensitivity reaction involves a misdirected immune overreaction to innocuous environmental and dietary antigens called allergens. The genetic predisposition to allergic disease, referred to as atopy, can be expressed as a variety of manifestations-e.g., allergic rhinitis, allergic conjunctivitis, atopic dermatitis, allergic asthma, anaphylaxis. Globally, allergic diseases are one the most common types of chronic conditions. Several factors have been identified to contribute to the pathogenesis and progression of the disease, leading to distinctively variable clinical symptoms. The factors which can attenuate or exacerbate allergic reactions can range from genetic heterozygosity, the prominence of various comorbid infections, and other factors such as pollution, climate, and interactions with other organisms and organism-derived products, and the surrounding environment. As a result, the effective prevention and control of allergies remains to be one of the most prominent public health problems. Therefore, to contextualize the current knowledge about allergic reactions, this review paper attempts to synthesize different aspects of an allergic response to describe its significance in the global health scheme. Specifically, the review shall characterize the biomolecular mechanisms of the pathophysiology of the disease based on underlying disease theories and current findings on ecologic interactions and describe prevention and control strategies being utilized. An integrated perspective that considers the underlying genetic, immunologic, and ecologic aspects of the disease would enable the development of more effective and targeted diagnostic tools and therapeutic strategies for the management and control of allergic diseases.
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Affiliation(s)
- Robbi Miguel G. Falcon
- Biomedical Innovations Research for Translational Health Science Laboratory, Department of Biochemistry and Molecular Biology, College of Medicine, University of the Philippines Manila, Manila, Philippines
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Gu L, Liu Y, Zhang W, Li J, Chang C, Su Y, Yang Y. Novel extraction technologies and potential applications of egg yolk proteins. Food Sci Biotechnol 2022; 32:121-133. [PMID: 36590017 PMCID: PMC9795146 DOI: 10.1007/s10068-022-01209-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 11/07/2022] [Accepted: 11/14/2022] [Indexed: 12/29/2022] Open
Abstract
The high nutritional value and diverse functional properties of egg yolk proteins have led to its widespread use in the fields of food, medicine, and cosmetics. Various extraction methods have been reported to obtain the proteins from egg yolk, however, their utilization is limited due to the relatively low extraction efficiency and/or toxic solvents involved. Several simpler and greener technologies, especially physical fields (ultrasound), have been successfully developed to improve the extraction efficiency. The egg yolk proteins may exert multiple biological activities, enabling them to be a promising tool in improve human health and wellbeing, such as anti-obesity, anti-atherosclerosis, anti-osteoporosis, diagnosis and therapy for SARS-CoV-2 infections. This article summarizes the novel extraction technologies and latest applications of the egg yolk proteins in the recent 5 years, which should stimulate their utilization as health-promoting functional ingredients in foods and other commercial products.
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Affiliation(s)
- Luping Gu
- State Key Laboratory of Food Science and TechnologySchool of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, 214122 China ,Hunan Engineering & Technology Research Center for Food Flavors and Flavorings, Jinshi, 415400 Hunan China
| | - Yufang Liu
- College of Food Engineering and Nutritional Science, Shanxi Normal University, Xi’an, China
| | - Wanqiu Zhang
- State Key Laboratory of Food Science and TechnologySchool of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, 214122 China
| | - Junhua Li
- State Key Laboratory of Food Science and TechnologySchool of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, 214122 China
| | - Cuihua Chang
- State Key Laboratory of Food Science and TechnologySchool of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, 214122 China
| | - Yujie Su
- State Key Laboratory of Food Science and TechnologySchool of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, 214122 China ,Hunan Engineering & Technology Research Center for Food Flavors and Flavorings, Jinshi, 415400 Hunan China
| | - Yanjun Yang
- State Key Laboratory of Food Science and TechnologySchool of Food Science and TechnologyCollaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, 214122 China ,Hunan Engineering & Technology Research Center for Food Flavors and Flavorings, Jinshi, 415400 Hunan China
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Antiprotozoal Effect of Snake Venoms and Their Fractions: A Systematic Review. Pathogens 2021; 10:pathogens10121632. [PMID: 34959587 PMCID: PMC8707848 DOI: 10.3390/pathogens10121632] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/08/2021] [Accepted: 12/13/2021] [Indexed: 11/17/2022] Open
Abstract
Background: Protozoal infection is a lingering public health issue of great concern, despite efforts to produce drugs and vaccines against it. Recent breakthrough research has discovered alternative antiprotozoal agents encompassing the use of snake venoms and their components to cure these infections. This study collated the existing literature to examine the antiprotozoal effect of snake venoms and their fractions. Methods: We conducted a systematic review following the PRISMA guidelines. The PubMed and Embase databases were searched from their inception until 13 October 2021. Articles were screened at the title, abstract and full-text phases. Some additional studies were obtained through the manual search process. Results: We identified 331 studies via the electronic database and manual searches, of which 55 reporting the antiprotozoal effect of snake venoms and their components were included in the review. Around 38% of studies examined the effect of whole crude venoms, and a similar percentage evaluated the effect of a proportion of enzymatic phospholipase A2 (PLA2). In particular, this review reports around 36 PLA2 activities and 29 snake crude venom activities. We also report the notable phenomenon of synergism with PLA2 isoforms of Bothrops asper. Importantly, limited attention has been given so far to the antiprotozoal efficacies of metalloproteinase, serine protease and three-finger toxins, although these venom components have been identified as significant components of the dominant venom families. Conclusion: This study highlights the impact of snake venoms and their fractions on controlling protozoal infections and suggests the need to examine further the effectiveness of other venom components, such as metalloproteinase, serine protease and three-finger toxins. Future research questions in this field must be redirected toward synergism in snake venom components, based on pharmacological usage and in the context of toxicology. Ascertaining the effects of snake venoms and their components on other protozoal species that have not yet been studied is imperative.
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7
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Teixeira SC, da Silva MS, Gomes AAS, Moretti NS, Lopes DS, Ferro EAV, Rodrigues VDM. Panacea within a Pandora's box: the antiparasitic effects of phospholipases A 2 (PLA 2s) from snake venoms. Trends Parasitol 2021; 38:80-94. [PMID: 34364805 DOI: 10.1016/j.pt.2021.07.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 07/07/2021] [Accepted: 07/08/2021] [Indexed: 10/20/2022]
Abstract
Parasitic diseases affect millions of individuals worldwide, mainly in low-income regions. There is no cure for most of these diseases, and the treatment relies on drugs that have side effects and lead to drug resistance, emphasizing the urgency to find new treatments. Snake venom has been gaining prominence as a rich source of molecules with antiparasitic potentials, such as phospholipases A2 (PLA2s). Here, we compile the findings involving PLA2s with antiparasitic activities against helminths, Plasmodium, Toxoplasma, and trypanosomatids. We indicate their molecular features, highlighting the possible antiparasitic mechanisms of action of these proteins. We also demonstrate interactions between PLA2s and some parasite membrane components, shedding light on potential targets for drug design that may provide better treatment for the illnesses caused by parasites.
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Affiliation(s)
- Samuel Cota Teixeira
- Department of Immunology, Institute of Biomedical Science, Federal University of Uberlândia, Uberlândia (UFU), MG, Brazil.
| | - Marcelo Santos da Silva
- DNA Replication and Repair Laboratory (DRRL), Department of Chemical and Biological Sciences, Biosciences Institute, São Paulo State University (UNESP), Botucatu, SP, Brazil
| | | | - Nilmar Silvio Moretti
- Laboratório de Biologia Molecular de Patógenos (LBMP), Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de Medicina, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil
| | - Daiana Silva Lopes
- Multidisciplinary Institute of Health, Anísio Teixeira Campus, Federal University of Bahia (UFBA), Vitória da Conquista, BA, Brazil
| | - Eloisa Amália Vieira Ferro
- Department of Immunology, Institute of Biomedical Science, Federal University of Uberlândia, Uberlândia (UFU), MG, Brazil
| | - Veridiana de Melo Rodrigues
- Laboratory of Biochemistry and Animal Toxins, Institute of Biotechnology, Federal University of Uberlândia (UFU), Uberlândia, MG, Brazil.
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8
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Silva GBD, Faria LSD, Lopes CA, Nunes DS, Ribeiro VS, de Sousa JEN, Paiva GCM, Gonçalves-Pires MRF, Borges IP, Santos MM, Ávila VMR, Júnior ÁF, Costa-Cruz JM. Egg yolk immunoglobulin Y as a promising tool to detect immune complexes in neurocysticercosis serum samples. Trans R Soc Trop Med Hyg 2021; 114:585-592. [PMID: 32484880 DOI: 10.1093/trstmh/traa028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 12/10/2019] [Accepted: 04/07/2020] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Neurocysticercosis (NCC) is a neglected tropical disease and its diagnosis is still a challenge due to non-specific manifestations. Neuroimaging techniques are used in the diagnosis of NCC, however, due to the high cost of these methods and the advantages presented in the use of immunological tests, such as ease of performance and satisfactory results, immunoassays are commonly used to detect antibodies against Taenia sp. antigens. The aim of the present study was to produce, characterize and apply specific polyclonal immunoglobulin Y (IgY) anti-Taenia crassiceps extracted from egg yolk of hens immunized with T. crassiceps metacestodes. METHODS Indirect enzyme-linked immunosorbent assay (ELISA), avidity ELISA, immunoblotting and indirect immunofluorescence tests were performed for characterization of IgY antibodies. Diagnostic performance was verified by ELISA for immune complex detection testing 90 serum samples. RESULTS Values of sensitivity, specificity, positive and negative likelihood ratios (LR+/LR-) and area under the curve (AUC) were calculated and presented the following results: sensitivity 83.3%, specificity 96.7%, AUC 0.966, LR+ 25.0 and LR- 0.17. CONCLUSIONS Results of this pioneering and innovative study demonstrate that anti-T. crassiceps IgY antibodies present potential applicability and can be used as an efficient tool in human NCC serodiagnosis.
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Affiliation(s)
- Gabriela B da Silva
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará, 1720, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Lucas S da Faria
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará, 1720, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Camila A Lopes
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará, 1720, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Daniela S Nunes
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará, 1720, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Vanessa S Ribeiro
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará, 1720, Uberlândia, Minas Gerais, 38400-902, 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
| | - Guilherme C M Paiva
- Laboratório de Diagnóstico de Parasitoses, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Av. Pará, 1720, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Maria R F Gonçalves-Pires
- 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
| | - Malú M Santos
- Programa de Pós-Graduação em Sanidade e Produção Animal nos Trópicos, Universidade de Uberaba, Campus Aeroporto. Av. Nenê Sabino, 1802, sala 2D05, Uberaba, Minas Gerais, 38055-500, 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, 1802, sala 2D05, Uberaba, Minas Gerais, 38055-500, 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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Anti- Ascaris suum immunoglobulin Y as a novel biotechnological tool for the diagnosis of human ascariasis. J Helminthol 2019; 94:e71. [PMID: 31409433 DOI: 10.1017/s0022149x19000701] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Human ascariasis is a neglected tropical disease of great relevance to public health and is considered the most frequent helminthiasis in poor regions. Accurately diagnosing this parasite has been challenging due to limitations of current diagnostic methods. Immunoglobulin Y (IgY) technology is a very effective alternative for the production of highly specific and profitable antibodies. This study aimed to produce and apply anti-Ascaris suum IgY antibodies in the immunodiagnosis of human ascariasis. Five immunizations comprising total saline extract from A. suum adult life forms were given at 14-day intervals to Gallus gallus domesticus hens of the Isa Brown line. Eggs and blood samples were collected weekly and fortnightly, respectively, to monitor the production of antibodies. The specificity of antibodies was confirmed by dot-blot, kinetic enzyme-linked immunosorbent assay (ELISA), avidity ELISA, immunoblotting and indirect immunofluorescence antibody tests. The application for disease diagnosis was performed through the detection of immune complexes in human serum samples by sandwich ELISA. Peaks of IgY anti-A. suum production occurred at weeks 6 and 8. IgY showed high avidity levels after the second dose of immunization, ranging from 64% to 93%, with a mean avidity index of 78.30%. Purified IgY recognized 12 bands of proteins from A. suum saline extract. Eggs, the uterine portion and cuticles of A. suum female adult are reactive in immunofluorescence. The detection of immune complexes showed diagnostic values of 80% sensitivity and 90% specificity. In conclusion, specific IgY have been shown to be a potential immunodiagnostic tool with promising future applications in human ascariasis.
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