1
|
Hataminejad M, Anvari D, Khaleghi N, Nayeri T, Shirazinia R, Shariatzadeh SA, Hosseini SA, Siyadatpanah A, Gholami S. Current status and future prospects of Echinococcus multilocularis vaccine candidates: A systematic review. Vet Anim Sci 2024; 24:100345. [PMID: 38516388 PMCID: PMC10950815 DOI: 10.1016/j.vas.2024.100345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024] Open
Abstract
The larval stages of Echinococcus multilocularis (E. multilocularis) are what cause the zoonotic disease known as alveolar echinococcosis (AE). Identifying the antigens that trigger immune responses during infection is extremely important for the development of vaccines against Echinococcus infections. Several studies conducted in recent decades have described the specific traits of the protective antigens found in E. multilocularis and their role in immunizing different animal hosts. The objective of the current systematic review was to summarize the findings of relevant literature on this topic and unravel the most effective vaccine candidate antigens for future research. A comprehensive search was conducted across five databases, including ProQuest, PubMed, Scopus, ScienceDirect, and Web of Science, until March 1, 2023. Two reviewers autonomously conducted the screening and evaluation of data extraction and quality assessment. In the present study, a total of 41 papers matched the criteria for inclusion. The study findings indicate that the combination of Em14-3-3 and BCG is widely considered the most often employed antigens for E. multilocularis immunization. In addition, the study describes antigen delivery, measurement of immune responses, adjuvants, animal models, as well as routes and doses of vaccination. The research indicated that recombinant vaccines containing EMY162, EM95, and EmII/3-Em14-3-3 antigens and crude or purified antigens containing ribotan-formulated excretory/secretory antigens exhibited the most favorable outcomes and elicited protective immune responses.
Collapse
Affiliation(s)
- Maryam Hataminejad
- Student Research Committee, Mazandaran University of Medical Science, Sari, Iran
- Toxoplasmosis Research Center, Department of Parasitology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Davood Anvari
- Department of Parasitology and Mycology, Faculty of Medicine, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | - Nahid Khaleghi
- Faculty of Medicine, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | - Tooran Nayeri
- Infectious and Tropical Diseases Research Center, Dezful University of Medical Sciences, Dezful, Iran
| | - Reza Shirazinia
- Department of Comparative Biosciences, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Seyyed Ali Shariatzadeh
- Toxoplasmosis Research Center, Department of Parasitology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Seyed Abdollah Hosseini
- Toxoplasmosis Research Center, Department of Parasitology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | | | - Shirzad Gholami
- Toxoplasmosis Research Center, Department of Parasitology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| |
Collapse
|
2
|
Miles S, Dematteis S, Mourglia-Ettlin G. Experimental cystic echinococcosis as a proof of concept for the development of peptide-based vaccines following a novel rational workflow. Biologicals 2023; 82:101684. [PMID: 37201271 DOI: 10.1016/j.biologicals.2023.101684] [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: 04/19/2022] [Revised: 03/14/2023] [Accepted: 04/24/2023] [Indexed: 05/20/2023] Open
Abstract
Vaccines are among the most important advances in medicine throughout the human history. However, conventional vaccines exhibit several drawbacks in terms of design and production costs. Peptide-based vaccines are attractive alternatives, since they can be designed mainly in silico, can be produced cheaply and safely, and are able to induce immune responses exclusively towards protective epitopes. Yet, a proper peptide design is needed, not only to generate peptide-specific immune responses, but also for them to recognize the native protein in the occurrence of a natural infection. Herein, we propose a rational workflow for developing peptide-based vaccines including novel steps that assure the cross-recognition of native proteins. In this regard, we increased the probability of generating efficient antibodies through the selection of linear B-cell epitopes free of post-translational modifications followed by analyzing the 3D-structure similarity between the peptide in-solution vs. within its parental native protein. As a proof of concept, this workflow was applied to a set of seven previously suggested potential protective antigens against the infection by Echinococcus granulosus sensu lato. Finally, two peptides were obtained showing the capacity to induce specific antibodies able to exert anti-parasite activities in different in vitro settings, as well as to provide significant protection in the murine model of secondary echinococcosis.
Collapse
Affiliation(s)
- Sebastian Miles
- Area Inmunología, DEPBIO/IQB, Facultad de Química/Facultad de Ciencias, Universidad de la Republica, Montevideo, Uruguay; Graduate Program in Chemistry, Facultad de Química, Universidad de la Republica, Uruguay
| | - Sylvia Dematteis
- Area Inmunología, DEPBIO/IQB, Facultad de Química/Facultad de Ciencias, Universidad de la Republica, Montevideo, Uruguay
| | - Gustavo Mourglia-Ettlin
- Area Inmunología, DEPBIO/IQB, Facultad de Química/Facultad de Ciencias, Universidad de la Republica, Montevideo, Uruguay.
| |
Collapse
|
3
|
Anvari D, Rezaei F, Ashouri A, Rezaei S, Majidiani H, Pagheh AS, Rezaei F, Shariatzadeh SA, Fotovati A, Siyadatpanah A, Gholami S, Ahmadpour E. Current situation and future prospects of Echinococcus granulosus vaccine candidates: A systematic review. Transbound Emerg Dis 2020; 68:1080-1096. [PMID: 32762075 DOI: 10.1111/tbed.13772] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 07/20/2020] [Accepted: 08/01/2020] [Indexed: 12/14/2022]
Abstract
Cystic echinococcosis is a worldwide zoonotic disease, represents a threat for livestock and humans, manifests as a quiescent, subclinical and chronic hydatid cyst infection. The disease imposes high expenditures and economic losses in medical and veterinary. Prophylactic vaccination would be one of the effective preventive health care against echinococcosis. During the last decades, many studies have characterized the protective antigens of Echinococcus granulosus and their role in immunization of various animal host species. Herein, we aimed to systematically evaluate and represent the best antigens as possible vaccine candidates for cystic echinococcosis. Data were systematically searched from five databases including ProQuest, PubMed, Scopus, ScienceDirect and Web of Science, up to 1 February 2020. Two reviewers independently screened and assessed data extraction and quality assessment. A total of 47 articles were eligible for inclusion criteria in the current study. The most common antigens used for vaccination against E. granulosus were EG95 and antigen B. Freund's adjuvant and Quil A have been predominantly utilized. In addition, regarding the antigen delivery, animal models, measurement of immune responses and reduction in hydatid cyst have been discussed in the text. The data demonstrated that DNA vaccines with antigen B and recombinant protein vaccines based on EG95 antigen have the best results and elicited protective immune responses.
Collapse
Affiliation(s)
- Davood Anvari
- Student Research Committee, Mazandaran University of Medical Science, Sari, Iran.,Department of Parasitology, School of Medicine, Toxoplasmosis Research Center, Mazandaran University of Medical Sciences, Sari, Iran.,School of Medicine, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | - Fatemeh Rezaei
- Faculty of Modern Sciences and Technologies, Islamic Azad University of Medical Sciences, Tehran, Iran
| | - Alireza Ashouri
- Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Saeed Rezaei
- Faculty of Veterinary Medicine, Islamic Azad University, Karaj, Iran
| | - Hamidreza Majidiani
- Zonotic Diseases Research Center, Ilam University of Medical Sciences, Ilam, Iran
| | - Abdol Sattar Pagheh
- Infectious Disease Research Center, Birjand University of Medical Sciences, Birjand, Iran
| | - Fatemeh Rezaei
- Department of Parasitology, School of Medicine, Toxoplasmosis Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Seyyed Ali Shariatzadeh
- Student Research Committee, Mazandaran University of Medical Science, Sari, Iran.,Department of Parasitology, School of Medicine, Toxoplasmosis Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Amir Fotovati
- Faculty of Veterinary Medicine, University of Zabol, Zabol, Iran
| | | | - Shirzad Gholami
- Department of Parasitology, School of Medicine, Toxoplasmosis Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Ehsan Ahmadpour
- Infectious and Tropical Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Parasitology and Mycology, Tabriz University of Medical Sciences, Tabriz, Iran
| |
Collapse
|
4
|
Nourmohammadi H, Javanmardi E, Shams M, Shamsinia S, Nosrati MC, Yousefi A, Nemati T, Fatollahzadeh M, Ghasemi E, Kordi B, Majidiani H, Irannejad H. Multi-epitope vaccine against cystic echinococcosis using immunodominant epitopes from EgA31 and EgG1Y162 antigens. INFORMATICS IN MEDICINE UNLOCKED 2020. [DOI: 10.1016/j.imu.2020.100464] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
|
5
|
Miles S, Portela M, Cyrklaff M, Ancarola ME, Frischknecht F, Durán R, Dematteis S, Mourglia-Ettlin G. Combining proteomics and bioinformatics to explore novel tegumental antigens as vaccine candidates against Echinococcus granulosus infection. J Cell Biochem 2019; 120:15320-15336. [PMID: 31038784 DOI: 10.1002/jcb.28799] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/30/2019] [Accepted: 02/04/2019] [Indexed: 12/20/2022]
Abstract
Echinococcus granulosus is the parasite responsible for cystic echinococcosis (CE), an important worldwide-distributed zoonosis. New effective vaccines against CE could potentially have great economic and health benefits. Here, we describe an innovative vaccine design scheme starting from an antigenic fraction enriched in tegumental antigens from the protoscolex stage (termed PSEx) already known to induce protection against CE. We first used mass spectrometry to characterize the protein composition of PSEx followed by Gene Ontology analysis to study the potential Biological Processes, Molecular Functions, and Cellular Localizations of the identified proteins. Following, antigenicity predictions and determination of conservancy degree against other organisms were determined. Thus, nine novel proteins were identified as potential vaccine candidates. Furthermore, linear B cell epitopes free of posttranslational modifications were predicted in the whole PSEx proteome through colocalization of in silico predicted epitopes within peptide fragments identified by matrix-assisted laser desorption/ionization-TOF/TOF. Resulting peptides were termed "clean linear B cell epitopes," and through BLASTp scanning against all nonhelminth proteins, those with 100% identity against any other protein were discarded. Then, the secondary structure was predicted for peptides and their corresponding proteins. Peptides with highly similar secondary structure respect to their parental protein were selected, and those potentially toxic and/or allergenic were discarded. Finally, the selected clean linear B cell epitopes were mapped within their corresponding 3D-modeled protein to analyze their possible antibody accessibilities, resulting in 14 putative peptide vaccine candidates. We propose nine novel proteins and 14 peptides to be further tested as vaccine candidates against CE.
Collapse
Affiliation(s)
- Sebastián Miles
- Área Inmunología, DEPBIO/IQB, Facultad de Química/Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Madelón Portela
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo and IIBCE, Montevideo, Uruguay
| | - Marek Cyrklaff
- Integrative Parasitology, Center for Infectious Diseases, Heidelberg University, Heidelberg, Germany
| | - María Eugenia Ancarola
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Friedrich Frischknecht
- Integrative Parasitology, Center for Infectious Diseases, Heidelberg University, Heidelberg, Germany
| | - Rosario Durán
- Unidad de Bioquímica y Proteómica Analíticas, Institut Pasteur de Montevideo and IIBCE, Montevideo, Uruguay
| | - Sylvia Dematteis
- Área Inmunología, DEPBIO/IQB, Facultad de Química/Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Gustavo Mourglia-Ettlin
- Área Inmunología, DEPBIO/IQB, Facultad de Química/Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| |
Collapse
|
6
|
Sefiddashti RR, Sharafi SM, Ebrahimi SA, Akhlaghi L, Moosavi A, Eskandarian A, Darani HY. A 53 KDa Glycan Antigen of Hydatid Cyst Wall May Involve in Evasion from Host Immune System. Adv Biomed Res 2018; 7:82. [PMID: 29930922 PMCID: PMC5991282 DOI: 10.4103/abr.abr_287_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background: Recent studies have shown that similar host glycan antigens are expressed by helminths such as Echinococcus granulosus hydatid cysts to evade from host immune system. In this work to investigate these antigens further, immunological cross-reactivity between human sera and hydatid cyst wall antigens has been investigated. Materials and Methods: Hydatid cyst wall antigens were used in enzyme-linked immunosorbent assay and Western immunoblotting and probed with pooled sera of hydatidosis patients and healthy controls. Sodium metaperiodate treatment was used to investigate glycan antigens. Results: A band with molecular weight about 53 KDa reacted with both hydatid patients' sera and also normal human sera. It has been shown that this band was a glycan antigen. Conclusions: A 53 KDa glycan antigen of hydatid cyst wall that reacted with all human sera may have an important role for evasion from host immune system.
Collapse
Affiliation(s)
- Raheleh Rafiei Sefiddashti
- Department of Medical Parasitology and Mycology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Seyedeh Maryam Sharafi
- Infectious Diseases and Tropical Medicine Research Centre, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Soltan Ahmad Ebrahimi
- Department of Pharmacology, Faculty of Medicine, Razi Institute for Drug Research, Iran University of Medical Sciences, Tehran, Iran
| | - Lame Akhlaghi
- Department of Medical Parasitology and Mycology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Ali Moosavi
- Department of of Medical Parasitology and Mycology, Iran University of Medical Sciences, Tehran, Iran
| | - Abasali Eskandarian
- Department of Parasitology and Mycology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hossein Yousofi Darani
- Department of Parasitology and Mycology, Isfahan University of Medical Sciences, Isfahan, Iran
| |
Collapse
|
7
|
Rafiei Sefiddashti R, Sharafi SM, Ebrahimi SA, Akhlaghi L, Moosavi A, Eskandarian A, Hejrati A, Yousofi Darani H. Antibody response to glycan antigens of hydatid cyst fluid, laminated layer and protoscolex of Echinococcus granulosus. Med J Islam Repub Iran 2017; 31:12. [PMID: 28955662 PMCID: PMC5609323 DOI: 10.18869/mjiri.31.12] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2016] [Indexed: 01/13/2023] Open
Abstract
Background: Hydatid disease is characterized by long-term growth of hydatid cysts in the human. The glycan antigens have an important role in the immunology of hydatid cyst. In this study immunological reaction of host sera to different glycan antigens of the cyst, has been investigated.
Methods: The antibody responses were tested to glycoprotein and glycolipid of the laminated layer (LL), cyst fluid (CF) and protoscolex (PS) antigens of E. Granulosus using ELISA and western immunoblotting tests. Thin-layer chromatography and ß-elimination were used for glycan purification.
Results: Both hydatid cyst and normal human sera reacted with hydatid cyst fluid, protoscolices, laminated layer, glycoprotein and glycolipid antigens. The most antigen-antibody reaction was related to CF and PS antigens, and LL antigens had the minimal reaction with the sera. Thin layer chromatography (TLC) of the antigens showed presence of many glycan bands in the laminated layer.
Conclusion: The parasite may elaborate different glycan antigens in LL to evade host immune response.
Collapse
Affiliation(s)
| | - Seyedeh Maryam Sharafi
- Infectious Diseases and Tropical Medicine Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Soltan Ahmad Ebrahimi
- Pharmacology Department and Razi Institute for Drug Research, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Lame Akhlaghi
- Department of Medical Parasitology and Mycology, Faculty of Medicine, Iran university of Medical Sciences, Tehran, Iran
| | - Ali Moosavi
- Iran University of Medical Sciences, Tehran, Iran
| | - Abbasali Eskandarian
- Department of Parasitology and Mycology, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Hossein Yousofi Darani
- Department of Parasitology and Mycology, Isfahan University of Medical Sciences, Isfahan, Iran
| |
Collapse
|
8
|
Díaz A, Casaravilla C, Barrios AA, Ferreira AM. Parasite molecules and host responses in cystic echinococcosis. Parasite Immunol 2016; 38:193-205. [PMID: 26425838 DOI: 10.1111/pim.12282] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 09/22/2015] [Indexed: 01/03/2023]
Abstract
Cystic echinococcosis is the infection by the larvae of cestode parasites belonging to the Echinococcus granulosus sensu lato species complex. Local host responses are strikingly subdued in relation to the size and persistence of these larvae, which develop within mammalian organs as 'hydatid cysts' measuring up to tens of cm in diameter. In a context in which helminth-derived immune-suppressive, as well as Th2-inducing, molecules garner much interest, knowledge on the interactions between E. granulosus molecules and the immune system lags behind. Here, we discuss what is known and what are the open questions on E. granulosus molecules and structures interacting with the innate and adaptive immune systems, potentially or in demonstrated form. We attempt a global biological approach on molecules that have been given consideration primarily as protective (Eg95) or diagnostic antigens (antigen B, antigen 5). We integrate glycobiological information, which traverses the discussions on antigen 5, the mucin-based protective laminated layer and immunologically active preparations from protoscoleces. We also highlight some less well-known molecules that appear as promising candidates to possess immune-regulatory activities. Finally, we point out gaps in the molecular-level knowledge of this infectious agent that hinder our understanding of its immunology.
Collapse
Affiliation(s)
- A Díaz
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
| | - C Casaravilla
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
| | - A A Barrios
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
| | - A M Ferreira
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
| |
Collapse
|
9
|
Tamarozzi F, Mariconti M, Neumayr A, Brunetti E. The intermediate host immune response in cystic echinococcosis. Parasite Immunol 2016; 38:170-81. [DOI: 10.1111/pim.12301] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 12/09/2015] [Indexed: 12/18/2022]
Affiliation(s)
- F. Tamarozzi
- Department of Clinical, Surgical, Diagnostic and Paediatric Sciences; University of Pavia; Pavia Italy
- WHO Collaborating Centre for Clinical Management of Cystic Echinococcosis; Pavia Italy
| | - M. Mariconti
- WHO Collaborating Centre for Clinical Management of Cystic Echinococcosis; Pavia Italy
- Division of Infectious and Tropical Diseases; San Matteo Hospital Foundation; Pavia Italy
| | - A. Neumayr
- Medical Services and Diagnostic; Swiss Tropical and Public Health Institute; Basel Switzerland
- University of Basel; Basel Switzerland
| | - E. Brunetti
- Department of Clinical, Surgical, Diagnostic and Paediatric Sciences; University of Pavia; Pavia Italy
- WHO Collaborating Centre for Clinical Management of Cystic Echinococcosis; Pavia Italy
- Division of Infectious and Tropical Diseases; San Matteo Hospital Foundation; Pavia Italy
| |
Collapse
|
10
|
Mourglia-Ettlin G, Miles S, Hernández A, Dematteis S. Antibody profiling in ultrasound normal individuals with positive serology for cystic echinococcosis. Parasite Immunol 2016; 38:93-100. [DOI: 10.1111/pim.12302] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 12/23/2015] [Indexed: 12/24/2022]
Affiliation(s)
- G. Mourglia-Ettlin
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
| | - S. Miles
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
| | - A. Hernández
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
| | - S. Dematteis
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
| |
Collapse
|
11
|
Natural and induced antibodies contribute to differential susceptibility to secondary cystic echinococcosis of Balb/c and C57Bl/6 mice. Immunobiology 2016; 221:103-15. [DOI: 10.1016/j.imbio.2015.07.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/07/2015] [Accepted: 07/23/2015] [Indexed: 01/15/2023]
|
12
|
Arana Y, Verastegui M, Tuero I, Grandjean L, Garcia HH, Gilman RH. Characterization of the carbohydrate components of Taenia solium oncosphere proteins and their role in the antigenicity. Parasitol Res 2013; 112:3569-78. [PMID: 23982308 DOI: 10.1007/s00436-013-3542-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Accepted: 07/10/2013] [Indexed: 11/27/2022]
Abstract
This study examines the carbohydrate composition of Taenia solium whole oncosphere antigens (WOAs), in order to improve the understanding of the antigenicity of the T. solium. Better knowledge of oncosphere antigens is crucial to accurately diagnose previous exposure to T. solium eggs and thus predict the development of neurocysticercosis. A set of seven lectins conjugates with wide carbohydrate specificity were used on parasite fixations and somatic extracts. Lectin fluorescence revealed that D-mannose, D-glucose, D-galactose and N-acetyl-D-galactosamine residues were the most abundant constituents of carbohydrate chains on the surface of T. solium oncosphere. Lectin blotting showed that posttranslational modification with N-glycosylation was abundant while little evidence of O-linked carbohydrates was observed. Chemical oxidation and enzymatic deglycosylation in situ were performed to investigate the immunoreactivity of the carbohydrate moieties. Linearizing or removing the carbohydrate moieties from the protein backbones did not diminish the immunoreactivity of these antigens, suggesting that a substantial part of the host immune response against T. solium oncosphere is directed against the peptide epitopes on the parasite antigens. Finally, using carbohydrate probes, we demonstrated for the first time that the presence of several lectins on the surface of the oncosphere was specific to carbohydrates found in intestinal mucus, suggesting a possible role in initial attachment of the parasite to host cells.
Collapse
Affiliation(s)
- Yanina Arana
- Department of Cellular and Molecular Sciences, Faculty of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, PO Box 5045, Lima, Peru
| | | | | | | | | | | |
Collapse
|
13
|
MOURGLIA-ETTLIN G, AMEZCUA-VESELY MC, FRAGA R, BAZ A, MERINO MC, GRUPPI A, DEMATTEIS S. Echinococcus granulosus glycoconjugates induce peritoneal B cell differentiation into antibody-secreting cells and cytokine production. Parasite Immunol 2011; 33:621-31. [DOI: 10.1111/j.1365-3024.2011.01326.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
14
|
Baz A, Carol H, Fernández V, Mourglia-Ettlin G, Nieto A, Örn A, Dematteis S. Echinococcus granulosus: Induction of T-independent antibody response against protoscolex glycoconjugates in early experimental infection. Exp Parasitol 2008; 119:460-466. [DOI: 10.1016/j.exppara.2008.04.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2007] [Revised: 04/28/2008] [Accepted: 04/30/2008] [Indexed: 11/27/2022]
|
15
|
Taherkhani H, Zeyhle E, Rogan MT. Antibody responses in human cystic hydatid disease to the laminated layer of Echinococcus granulosus. Parasitol Res 2007; 101:647-52. [PMID: 17429692 DOI: 10.1007/s00436-007-0534-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2006] [Accepted: 03/14/2007] [Indexed: 11/26/2022]
Abstract
The laminated layer of hydatid cysts of Echinococcus granulosus represents a considerable amount of parasite material. Its antigenic role, however, is unclear. Extracts of laminated layer taken from sheep cysts were analysed in sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS/PAGE) and were found to contain bands at 55 and 25-29 kDa, which reacted with an anti-sheep IgG antibody probe, indicating that these were likely to be host-contaminating components within the layer. However, the same bands were also recognised by a significant proportion of human hydatid patients, particularly by IgG4 antibodies, and not by negative control individuals. These individuals did not recognise immunoglobulin heavy and light chains in a sheep serum extract in the same manner. It seems likely that there are either host or parasite antigenic components at similar molecular weights or that certain parasite antigens may share epitopes with sheep immunoglobulins. The antigens at 25-29 kDa were found to be glycoproteins by lectin blot analysis and may be important markers of disease status.
Collapse
Affiliation(s)
- H Taherkhani
- Medical Parasitology Department, Golestan University of Medical Sciences, Gorgan, Iran
| | | | | |
Collapse
|
16
|
Müller N, Frei E, Nuñez S, Gottstein B. Improved serodiagnosis of alveolar echinococcosis of humans using an in vitro-produced Echinococcus multilocularis antigen. Parasitology 2007; 134:879-88. [PMID: 17306060 DOI: 10.1017/s0031182006002083] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Serology is an important tool for the diagnosis of alveolar echinococcosis (AE) in humans. In order to improve serodiagnostic performance, we have developed an in vitro-produced Echinococcus mulilocularis metacestode vesicle fluid (EmVF) antigen for application in an immunoblot assay. Immunoblot analysis of EmVF revealed an abundant immunoreactive band triplet of 20-22 kDa, achieving a sensitivity of 100% based on the testing of sera from 62 pre-operative and pre-treatment cases of active and inactive AE. Thus, the EmVF-immunoblotting allowed the specific detection of cases seronegative by the Em2- and/or EmII/3-10-ELISA, usually attributable to abortive, inactive cases of AE. The specificity of the EmVF-immunoblotting did not allow discrimination between AE and cystic echinococcosis (CE) but was 100% with respect to non-Echinococcus parasitic infections or cancer malignancies. Based on the findings of this study, it is recommended that the current ELISA test combination (Em2- and II/3-10-ELISA) be complemented with EmVF-immunoblotting, allowing an improved diagnosis of both clinical and subclinical forms of AE, including those associated with E. multilocularis-specific antibody reactivities not detectable by ELISA.
Collapse
Affiliation(s)
- N Müller
- Institute of Parasitology, University of Berne, Berne, Switzerland.
| | | | | | | |
Collapse
|
17
|
Carmena D, Benito A, Eraso E. Antigens for the immunodiagnosis of Echinococcus granulosus infection: An update. Acta Trop 2006; 98:74-86. [PMID: 16527225 DOI: 10.1016/j.actatropica.2006.02.002] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2005] [Revised: 01/12/2006] [Accepted: 02/07/2006] [Indexed: 12/21/2022]
Abstract
The taeniid tapeworm Echinococcus granulosus is the causative agent of the echinococcal disease, an important zoonosis with worldwide distribution. Accurate immunodiagnosis of the infection requires highly specific and sensitive antigens to be used in immunodiagnostic assays. The choice of an appropriate source of antigenic material is a crucial point in the improvement of the diagnostic features of tests, and must be based on the developmental stage of the parasite and the host. The most common antigenic sources used for the immunodiagnosis of echinococcal disease are hydatid cyst fluid, somatic extracts and excretory-secretory products from protoscoleces or adults of E. granulosus. Hydatid cyst fluid is the antigenic source of reference for immunodiagnosis of human hydatidosis, which is mainly based on the detection of antigens B and 5. Somatic extracts have been widely used in the serodiagnosis for E. granulosus infection in dogs and ruminant intermediate hosts, although in the last few years the detection of excretory-secretory products of the worm in faeces (coproantigens) have become the most reliable method for the detection of the parasite in the definitive host. This review emphasizes recent advances in the identification and characterization of novel antigens with potential for the immunodiagnosis of echinococcal disease. Progress in recombinant technologies and synthetic peptides are also discussed. The paper highlights the need to search for new antigenic components with high diagnostic sensitivity and specificity, a fact that remains a crucial task in the improvement of the immunodiagnosis of the disease.
Collapse
Affiliation(s)
- David Carmena
- Department of Immunology, Microbiology and Parasitology, Faculty of Pharmacy, University of the Basque Country, Vitoria, Spain.
| | | | | |
Collapse
|
18
|
Baz A, Ettlin GM, Dematteis S. Complexity and function of cytokine responses in experimental infection by Echinococcus granulosus. Immunobiology 2006; 211:3-9. [PMID: 16446166 DOI: 10.1016/j.imbio.2005.09.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2005] [Accepted: 09/02/2005] [Indexed: 12/13/2022]
Abstract
Cytokines are important in the regulation of the immune system and are secreted by a variety of cells in response to self and non-self stimuli. Communication within cells, in the same or distant anatomical sites, occurs via cytokines which determine the quality and intensity of inflammatory and adaptive immune responses. Infection by helminths is characterized by a dominant secretion of type-2 cytokines; IL-4, IL-5, IL-10 (among others), which down-regulates the induction and functions of type-1 cytokines. The molecular mechanisms involved in the polarization of type-2 responses and their biological significance in helminthic infections are unknown, and probably depends on each host-parasite system. Understanding these issues may contribute to immune therapy against parasitic infections. Here we summarize our data obtained in Echinococcus granulosus experimental infection regarding type-2 cytokine induction and its putative role in the host-parasite interaction. Results suggest that induction of cytokine responses at different stages of infection is complex and depends on several parameters. In addition, they support the hypothesis that early IL-10, secreted by B cells in response to non-proteic antigens, may favour parasite survival and the establishment of a polarized type-2 cytokine response.
Collapse
Affiliation(s)
- Adriana Baz
- Cátedra de Inmunología, Facultad de Química, Facultad de Ciencias, Universidad de la República, Casilla de Correos 1157, Montevideo, Uruguay
| | | | | |
Collapse
|
19
|
Hernández A, Cardozo G, Dematteis S, Baz A, Trias N, Nuñez H, Barragué A, López L, Fuentes J, López O, Ferreira C. Cystic echinococcosis: analysis of the serological profile related to the risk factors in individuals without ultrasound liver changes living in an endemic area of Tacuarembó, Uruguay. Parasitology 2004; 130:455-60. [PMID: 15830820 DOI: 10.1017/s0031182004006717] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cystic echinococcosis (CE) is a high prevalence zoonosis among the rural population of Tacuarembó (Uruguay). The correlation between serological data and the incidence of risk factors was studied in a survey carried out in 1998 among rural communities where 480 individuals were examined by means of abdominal sonography (local prevalence=0·8%). Serum samples (305) were analysed by ELISA to determine specific IgG against crude antigens from Echinococcus granulosus. A total of 27 individuals exhibiting no detectable changes in abdominal sonographic examination were found to be seropositive (‘ultrasound normal group’). Of these individuals 9 were seroreactive against purified antigen B. A significant degree of correlation was found between seroreactivity and the incidence of some risk factors (CE antecedent in the family, P<0·005 and use of rural water, P<0·0001) among this group. Follow-up of individuals of the ‘ultrasound normal group’ was carried out after 2 years to evaluate the implications of this serological reactivity. No predictive value for cyst development was assessed with complementary image study; in contrast transient antibodies were observed with both crude and purified antigen as approximately 60% of individuals became negative when re-sampled.
Collapse
Affiliation(s)
- A Hernández
- Cátedra de Inmunología, Facultad de Química, Instituto de Higiene, Avda. A. Navarro 3051, Montevideo 11600, Uruguay.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Bandyopadhyay S, Chatterjee M, Pal S, Waller RF, Sundar S, McConville MJ, Mandal C. Purification, characterization of O-acetylated sialoglycoconjugates-specific IgM, and development of an enzyme-linked immunosorbent assay for diagnosis and follow-up of indian visceral leishmaniasis patients. Diagn Microbiol Infect Dis 2004; 50:15-24. [PMID: 15380274 DOI: 10.1016/j.diagmicrobio.2004.04.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The surface expression of 9-O-acetylated sialic acid (9-OAcSA) is elevated on hematopoietic cells and erythrocytes of visceral leishmaniasis (VL) patients. In this study, we show that VL patients contain elevated levels of IgM antibodies directed against 9-O-acetylated sialoglycoconjugates (9-OAcSG). These antibodies were affinity purified with bovine submaxillary protein as the affinity matrix containing the terminal epitope, 9-OAcSAalpha2-6GalNAc. They also bound to 9-OAcSGs on hematopoietic cells of patients with VL and to epitopes in the cytosol of Leishmania donovani promastigotes. A novel enzyme-linked immunosorbent assay was employed that showed 4-fold higher anti-OAcSG titers in VL patients (n=38), mean +/- S.E.M. being 0.83 +/- 0.09 vs. 0.21 +/- 0.04 detected in normal donors (n=20) and patients with cross-reactive diseases such as malaria (n=4) or tuberculosis (n=4). Assay specificity and sensitivity was 100% and 92%, respectively, whereas positive and negative predictive values were 100% and 90%, respectively. Significantly, anti-OAcSG titers declined 30 days after completion of anti-leishmanial treatment, indicating that monitoring of anti-9-OAcSGs may be a valuable alternative toward increasing the efficiency of diagnosis and follow-up of VL.
Collapse
Affiliation(s)
- Sumi Bandyopadhyay
- Immunobiology Division, Indian Institute of Chemical Biology, Jadavpur, Kolkata, India
| | | | | | | | | | | | | |
Collapse
|
21
|
Walker M, Baz A, Dematteis S, Stettler M, Gottstein B, Schaller J, Hemphill A. Isolation and characterization of a secretory component of Echinococcus multilocularis metacestodes potentially involved in modulating the host-parasite interface. Infect Immun 2004; 72:527-36. [PMID: 14688134 PMCID: PMC344003 DOI: 10.1128/iai.72.1.527-536.2004] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Echinococcus multilocularis metacestodes are fluid-filled, vesicle-like organisms, which are characterized by continuous asexual proliferation via external budding of daughter vesicles, predominantly in the livers of infected individuals. Tumor-like growth eventually leads to the disease alveolar echinococcosis (AE). We employed the monoclonal antibody (MAb) E492/G1, previously shown to be directed against a carbohydrate-rich, immunomodulatory fraction of Echinococcus granulosus, to characterize potentially related components in E. multilocularis. Immunofluorescence studies demonstrated that MAb E492/G1-reactive epitopes were found predominantly on the laminated layer and in the periphery of developing brood capsules. The respective molecules were continuously released into the exterior medium and were also found in the parasite vesicle fluid. The MAb E492/G1-reactive fraction in E. multilocularis, named Em492 antigen, was isolated by immunoaffinity chromatography. Em492 antigen had a protein/carbohydrate ratio of 0.25, reacted with a series of lectins, and is related to the laminated layer-associated Em2(G11) antigen. The epitope recognized by MAb E492/G1 was sensitive to sodium periodate but was not affected by protease treatment. Anti-Em492 immunoglobulin G1 (IgG1) and IgG2 and, at lower levels, IgG3 were found in sera of mice suffering from experimentally induced secondary, but not primary, AE. However, with regard to cellular immunity, a suppressive effect on concanavalin A- or crude parasite extract-induced splenocyte proliferation in these mice was observed upon addition of Em492 antigen, but trypan blue exclusion tests and transmission electron microscopy failed to reveal any cytotoxic effect in Em492 antigen-treated spleen cells. This indicated that Em492 antigen could be modulating the periparasitic cellular environment during E. multilocularis infection through as yet unidentified mechanisms and could be one of the factors contributing to immunosuppressive events that occur at the host-parasite interface.
Collapse
Affiliation(s)
- Mirjam Walker
- Institute of Parasitology, University of Berne, CH-3012 Berne, Switzerland.
| | | | | | | | | | | | | |
Collapse
|
22
|
Casaravilla C, Malgor R, Carmona C. Characterization of carbohydrates of adult Echinococcus granulosus by lectin-binding analysis. J Parasitol 2003; 89:57-61. [PMID: 12659303 DOI: 10.1645/0022-3395(2003)089[0057:cocoae]2.0.co;2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The identification of lectin-binding structures in adult worms of Echinococcus granulosus was carried out by lectin fluorescence; the distribution of carbohydrates in parasite glycoconjugates was also studied by lectin blotting. The lectins with the most ample recognition pattern were ConA, WGA, and PNA. ConA showed widespread reactivity in tegument and parenchyma components, including the reproductive system, suggesting that mannose is a highly expressed component of the adult glycans. Although reproductive structures appeared to be rich in N-acetyl-D-glucosamine (GlcNAc)-N-acetyl neuraminic acid (NeuAc) and galactose (Gal) as demonstrated by their strong reactivity with WGA and PNA, respectively, some differences were observed in their labeling patterns. This was very clear in the case of the vagina, which only reacted with WGA. Furthermore, WGA and ConA both had reactivity with the excretory canals. RCA, the other Gal binding lectin used, only reacted with the tegument, suggesting that widespread PNA reactivity with the reproductive system is related to the presence of the D-Gal-beta-(1,3)D-GalNAc terminal structure. UEA I failed to bind to any parasite tissues as determined by lectin fluorescence, whereas DBA and SBA showed a very faint staining of the tegument. However, in transferred glycans, N-acetyl-D-galactosamine (GalNAc) and fucose (Fuc) containing glycoproteins were distinctly detected.
Collapse
Affiliation(s)
- Cecilia Casaravilla
- Unidad de Biologia Parasitaria, Instituto de Higiene, Av. Alfredo Navarro 3051, CP 11600, Montevideo, Uruguay
| | | | | |
Collapse
|
23
|
Dai WJ, Hemphill A, Waldvogel A, Ingold K, Deplazes P, Mossmann H, Gottstein B. Major carbohydrate antigen of Echinococcus multilocularis induces an immunoglobulin G response independent of alphabeta+ CD4+ T cells. Infect Immun 2001; 69:6074-83. [PMID: 11553545 PMCID: PMC98736 DOI: 10.1128/iai.69.10.6074-6083.2001] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Echinococcus multilocularis causes alveolar echinococcosis, one of the most lethal helminthic (accidental) infections in humans, as the life cycle predominantly includes wildlife rodents as intermediate hosts. The physical barrier between the proliferating parasitic metacestode and the host tissue is the acellular laminated layer (LL), which is characterized by its rich high-molecular-weight polysaccharide composition. Conversely to a crude protein-rich vesicular fluid antigen, a major carbohydrate antigen of the LL--the Em2(G11) antigen--did not stimulate murine T-cell proliferation in vitro. In fact, the persistent metacestode growth and antigenic stimulation induced a Th2 shift in vivo following conventional infection by intraperitoneal inoculation of 100 metacestode vesicles into C57/BL6 mice. Concurrently, the expression of Th1 cytokines (interleukin-2 and gamma interferon) remained persistently low until the late stage of chronic infection. In comparison to a recombinant proteinic II/3 antigen, the specific immunoglobulin G (IgG) response against the Em2(G11) antigen (including all IgG isotypes) maintained persistently low avidity. Furthermore, the Em2(G11) antigen induced a specific IgM and IgG response in T-cell-deficient athymic nude, TCRbeta(-/-), major histocompatibility complex class II (MHCII)(-/-)(CD4-deficient), and CD40(-/-) mice. The Em2(G11)-specific IgG synthesized in nude TCRbeta(-/-) and MHCII(-/-) mice was predominantly of the IgG3 and IgG2a isotypes and of the IgG3 and IgG2b isotypes in CD40(-/-) mice. This finding suggested that in vivo, the IgG response to major carbohydrate antigen Em2(G11) of E. multilocularis could take place independently of alphabeta+ CD4+ T cells and in the absence of CD40-CD40 ligand interactions; thus, the Em2(G11) antigen of the acellular LL represents a T-cell-independent antigen. Functionally, the encapsulating LL, and especially its major carbohydrate antigen, Em2(G11), seems to be one of the key factors in the parasite's survival strategy and acts by modulating the host immune response by virtue of its T-cell-independent nature.
Collapse
Affiliation(s)
- W J Dai
- Institute of Parasitology, University of Berne, CH-3001 Berne, Switzerland.
| | | | | | | | | | | | | |
Collapse
|
24
|
Alvarez Errico D, Medeiros A, Míguez M, Casaravilla C, Malgor R, Carmona C, Nieto A, Osinaga E. O-glycosylation in Echinococcus granulosus: identification and characterization of the carcinoma-associated Tn antigen. Exp Parasitol 2001; 98:100-9. [PMID: 11465993 DOI: 10.1006/expr.2001.4620] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the present work we demonstrate that the cancer-associated O-glycosylated Tn antigen (GalNAc-O-Ser/Thr) is expressed by the cestode Echinococcus granulosus. This antigen was detected in both larval and adult worm extracts, with the highest specific activity observed in the adult excretion/secretion preparation. Histochemical analysis showed that Tn is preferentially expressed in the parenchyma in both parasite stages and the external part of tegument in adult worms. A similar pattern was observed for sialyl-Tn, a related O-linked antigen. Tn glycoproteins from protoscoleces were resolved by SDS-PAGE in two main components of 43 and 49 kDa. After purification, this material was reactive with lectins which bind GlcNAc/sialic acid, GalNAc, and T antigen. In a preliminary evaluation, high levels of Tn antigen were detected in serum samples from patients with hydatid cyst, suggesting that the measure of Tn in serum could be a biomarker of this disease, although extensive work is necessary in order to determine the clinical usefulness of this assay. The results reported here, the first evidence of O-glycosylation pathways in E. granulosus and the presence of Tn antigen in cestodes, suggest that the evaluation of O-glycosylated antigens might give new insights in the host-parasite relationship.
Collapse
|
25
|
Dematteis S, Pirotto F, Marqués J, Nieto A, Orn A, Baz A. Modulation of the cellular immune response by a carbohydrate rich fraction from Echinococcus granulosus protoscoleces in infected or immunized Balb/c mice. Parasite Immunol 2001; 23:1-9. [PMID: 11136472 DOI: 10.1046/j.1365-3024.2001.00346.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Infection of Balb/c mice with Echinococcus granulosus protoscoleces constitutes the model for secondary hydatid infection. The immune response of Balb/c mice infected with E. granulosus is characterized by secretion of antibodies specific for carbohydrate epitopes and production of type-2 cytokines. A role for glycoconjugates in the induction of type-2 responses has been suggested in other host--parasite systems. Although glycoconjugates are immunogenic in E. granulosus infection, the role of these molecules in the establishment of the type-2 response has never been analysed. In this study, a carbohydrate rich fraction (E4+) from E. granulosus protoscoleces was obtained using the monoclonal antibody E492/G1 specific for the moiety Galalpha(1,4)Gal which is widely represented in protoscoleces and other E. granulosus antigenic preparations. The results showed that E4+ was immunogenic in Balb/c mice evoking an antibody response mainly directed against carbohydrate epitopes. In addition, splenocytes from E4+-immunized mice showed suppressed proliferative responses to Con A and E4+ induced IL-10 secretion by E4+-primed and naive splenocytes. The fraction E4+ also was immunogenic in infected mice during early infection. In this case also, splenocytes from infected mice as well as peritoneal cells from infected or naive mice, when stimulated in vitro with E4+, secreted IL-10. Collectively, these results suggest that E4+ may be involved in immunosuppression phenomena and, by stimulating IL-10 secretion, may contribute to the induction and sustaining of the type-2 cytokine response established in early experimental infection.
Collapse
Affiliation(s)
- S Dematteis
- Cátedra de Inmunología, Facultad de Química, Facultad de Ciencias, Montevideo, Uruguay.
| | | | | | | | | | | |
Collapse
|
26
|
Irabuena O, Nieto A, Ferreira AM, Battistoni J, Ferragut G. Characterization and optimization of bovine Echinococcus granulosus cyst fluid to be used in immunodiagnosis of hydatid disease by ELISA. Rev Inst Med Trop Sao Paulo 2000; 42:255-62. [PMID: 11058935 DOI: 10.1590/s0036-46652000000500004] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this work was to assess the influence in the diagnostic value for human hydatid disease of the composition of bovine hydatid cyst fluid (BHCF) obtained from fertile (FC) and non-fertile cysts (NFC). Eight batches from FC and 5 from NFC were prepared and analysed with respect to chemical composition: total protein, host-derived protein, carbohydrate and lipid contents. No differences were observed in the first two parameters but carbohydrate and lipid contents were shown to be higher in batches from FC than in those from NFC. Bands of 38 and 116 kD in SDS-PAGE profiles were observed to be present in BHCF from FC only. Two pools were prepared from BHCF batches obtained from FC (PFC) and NFC (PNFC), respectively. Antigen recognition patterns were analysed by immunoblot. Physicochemical conditions for adsorption of antigens to the polystyrene surface (ELISA plates) were optimized. The diagnostic value of both types of BHCF as well as the diagnostic relevance of oxidation of their carbohydrate moieties with periodate were assessed by ELISA using 42 serum samples from hydatid patients, 41 from patients with other disorders, and 15 from healthy donors. Reactivity of all sera against native antigen were tested with and without free phosphorylcholine. The best diagnostic efficiency was observed using BHCF from periodate-treated PFC using glycine buffer with strong ionic strength to coat ELISA plates.
Collapse
Affiliation(s)
- O Irabuena
- Laboratorio de Inmunología, Regional Norte, Universidad de la República, Salto, Uruguay
| | | | | | | | | |
Collapse
|
27
|
Restrepo BI, Obregón-Henao A, Mesa M, Gil DL, Ortiz BL, Mejía JS, Villota GE, Sanzón F, Teale JM. Characterisation of the carbohydrate components of Taenia solium metacestode glycoprotein antigens. Int J Parasitol 2000; 30:689-96. [PMID: 10856502 DOI: 10.1016/s0020-7519(00)00057-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Human neurocysticercosis is caused by Taenia solium metacestodes. It usually affects the central nervous system of humans and can be confused with other brain pathologies. The Lens culinaris-binding glycoproteins from this parasite have been shown to be ideal targets for the development of a highly specific immunoassay for the diagnosis of neurocysticercosis. In the present study we characterised the carbohydrates associated with five antigenic glycoproteins of T. solium metacestodes in the range of 12-28 kilodaltons. Lectin-affinities and enzymatic deglycosylations suggested that each of the five antigens contain various glycoforms of asparagine-linked carbohydrates of the hybrid, complex and probably high mannose type. These carbohydrates accounted for at least 30-66% of the apparent molecular mass of the glycoconjugates. In contrast, there was no evidence for the presence of O-linked carbohydrates. Lectin affinity patterns suggested that the sugars are short and truncated in their biosynthetic route, and that some contain terminal galactose moieties. Elucidating the precise structure of the carbohydrates and establishing their role in antigenicity will be essential to design strategies to produce them in large and reproducible amounts for the development of improved immunoassays.
Collapse
Affiliation(s)
- B I Restrepo
- Molecular Parasitology Group, Corporación para Investigaciones Biológicas, Medellín, Colombia.
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
González G, Spinelli P, Lorenzo C, Hellman U, Nieto A, Willis A, Salinas G. Molecular characterization of P-29, a metacestode-specific component of Echinococcus granulosus which is immunologically related to, but distinct from, antigen 5. Mol Biochem Parasitol 2000; 105:177-84. [PMID: 10693741 DOI: 10.1016/s0166-6851(99)00166-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In this work the characterization of P-29, a novel 29 kDa antigen from Echinococcus granulosus is reported. E. granulosus was identified while looking for parasite antigens distinct from those present in hydatid cyst fluid. A monoclonal antibody (mAb 47H.PS) prepared against protoscolex components revealed that P-29 is localized to the tegument and rostellum of protoscoleces, and to the germinal layer of the cyst, but it is absent in hydatid cyst fluid or adult worm extracts. Several internal fragments of P-29 showed sequence identity to the amino acid sequence encoded by Eg6, a partial gene sequence reported to code for an epitope of antigen 5 (Ag5), one of the major diagnostic antigens of the parasite. We confirmed that Eg6 encodes a sub-fragment of P-29 by mapping the epitope of mAb 47H.PS, and isolating the full length P-29 cDNA. Since Eg6 had been, postulated to encode a fragment of Ag5, we specifically studied the relationship of P-29 and Ag5 by: (i) examining the cross-reactivity displayed by different mAbs; (ii) comparison of their peptide finger prints; and (iii) a comparative study of their diagnostic value. Our results prove unequivocally that P-29 and Ag5 are immunologically related, but different proteins, raising several questions on the current knowledge of Ag5.
Collapse
Affiliation(s)
- G González
- Cátedra de Inmunología-Facultad de Química, Montevideo, Uruguay.
| | | | | | | | | | | | | |
Collapse
|
29
|
Baz A, Richieri A, Puglia A, Nieto A, Dematteis S. Antibody response in CD4-depleted mice after immunization or during early infection with Echinococcus granulosus. Parasite Immunol 1999; 21:141-50. [PMID: 10205794 DOI: 10.1046/j.1365-3024.1999.00212.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The aims of this work were to investigate the existence of T-independent antigens in Echinococcus granulosus protoscoleces and to evaluate the relative contribution of T-independent stimulation to the overall antibody response in early infection. Mice depleted of CD4(+)-cells were immunized with protoscolex somatic antigens (PSA) or infected with E. granulosus protoscoleces (PSC). Results showed that the response of CD4-depleted immunized mice had the expected characteristics of a T-independent stimulation and that such T-independent stimulation was important mainly during primary response. During infection absence of CD4(+)-cells affected mainly the secretion of all IgG subclasses with the exception of IgG3 and IgM. To carry out a preliminary isolation of PSC T-independent antigens we prepared a carbohydrate enriched fraction from protoscolex antigens, using a monoclonal antibody specific for the carbohydrate moiety Gal alpha(1,4)Gal highly expressed in PSC. This fraction was mitogenic for naive mouse splenocytes and was recognized by a high percentage of the specific antibodies secreted by CD4-depleted immunized or infected mice. In summary, these results suggest that E. granulosus protoscoleces contain immunogenic T-independent antigens. Primary antibody responses to protoscolex somatic antigens and the production of IgM and IgG3 in early infection would be mainly stimulated by a T-independent mechanism.
Collapse
Affiliation(s)
- A Baz
- Cátedra de Inmunología, Facultad de Química, Facultad de Ciencias, Montevideo, Uruguay
| | | | | | | | | |
Collapse
|
30
|
Dematteis S, Baz A, Rottenberg M, Fernández C, Orn A, Nieto A. Antibody and Th1/Th2-type responses in BALB/c mice inoculated with live or dead Echinococcus granulosus protoscoleces. Parasite Immunol 1999; 21:19-26. [PMID: 10081768 DOI: 10.1046/j.1365-3024.1999.00198.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The aims of this study were to investigate whether a Th1- or a Th2-type response is stimulated in the first stages of experimental infection with Echinococcus granulosus, and to determine whether live or dead protoscoleces equally contribute to such Th1/Th2-type polarization. Live parasites stimulated the production of IL-10, IL-4 and IL-5 as early as week 1 postinoculation. The levels of IL-10 and IL-4 decreased towards week 4 p.i. and that of IFN gamma increased. The production of specific antibodies was characterized by high levels of systemic IgG1 and local IgM and IgG3 (measured in peritoneal lavages). In contrast, dead parasites induced elevated levels of IL-4, IFN gamma, IL-10 and IL-5 on week 1 postinoculation followed by a decrease of IFN gamma and an increase of IL-4. Low levels of specific antibodies were stimulated by dead parasites both systemically and in the peritoneal cavity. These results show that E. granulosus infection induced an early Th2-type response and that live parasites stimulated stronger antibody responses than dead parasites. In addition, they strongly suggest that both phenomena were modulated by live protoscoleces.
Collapse
Affiliation(s)
- S Dematteis
- Cátedra de Inmunología, Facultad de Quimica, Montevideo, Uruguay
| | | | | | | | | | | |
Collapse
|
31
|
Sterla S, Sato H, Nieto A. Echinococcus granulosus human infection stimulates low avidity anticarbohydrate IgG2 and high avidity antipeptide IgG4 antibodies. Parasite Immunol 1999; 21:27-34. [PMID: 10081769 DOI: 10.1046/j.1365-3024.1999.00197.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Total IgG and IgG subclasses recognizing carbohydrate and peptidic epitopes from native and periodate treated partially purified hydatid cyst fluid (ppHCFA) and protoscolex somatic antigens (PSA) were tested by ELISA in hydatid patients sera. Binding of the major cross-reactive antiphosphorylcholine antibodies was inhibited with free reagent. A predominant anticarbohydrate antibody response against ppHCFA and PSA is shown. Although the main contributing IgG subclass to the antipeptide response against both antigens was IgG4, IgG1 also significantly contributed to the anti-PSA peptidic epitopes response. Western blot showed that IgG1 antibodies strongly recognized in ppHCFA a periodate susceptible 38 kDa antigen. The IgG4 antibodies mainly recognized the periodate-resistant 12, 16 and 24 kDa antigens. In addition, IgG2 antibodies recognized three strongly periodate-susceptible broad bands (116, 55 and 24 kDa antigens). PSA-specific IgG1 and IgG4 antibodies showed similar patterns of antigen recognition as well as no significant reduction of reactivity after periodate treatment while the IgG2 antibody recognition was strongly affected by this treatment. Furthermore, IgG2 showed significantly lower avidities than IgG1 and IgG4 antibodies recognizing both antigens. In conclusion, hydatid patients showed an enhanced production of low avidity anticarbohydrate IgG2 as well as high avidity antipeptide IgG4 antibodies.
Collapse
Affiliation(s)
- S Sterla
- Laboratorio de Inmunología, Universidad de la República, Salto, Uruguay
| | | | | |
Collapse
|
32
|
Ferragut G, Ljungström I, Nieto A. Relevance of circulating antigen detection to follow-up experimental and human cystic hydatid infections. Parasite Immunol 1998; 20:541-9. [PMID: 9988311 DOI: 10.1046/j.1365-3024.1998.00177.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We analysed specific antibody (Ab) and circulating antigen (CAg) profiles along experimental mouse infection using as control a group of mice immunized with intact but dead parasites. Results from this experiment showed an early major CAg peak followed by a larger Ab peak which partially overlaps with other minor CAg peaks. These results suggest that CAg may be a marker of early mouse infection. In order to study the relevance of these findings in humans we similarly analysed by ELISA 148 sera provided by retrospective post-surgical follow-up of 19 patients. Available records showed that 14 patients developed new cysts one to ten years after surgery while no new disease was observed in the-other five. Some of the former patients showed CAg, as early as two months after surgery while no CAg was observed in the other five patients at any time. In addition, a collection of 38 sera obtained before surgery were similarly tested and five of them showed only CAg, while 18 showed only Ab and 12 sera showed Ab&CAg. These results in humans are consistent with the findings in the mouse experimental model and suggest that CAg may be an early marker of hydatid infection, thus being relevant for post-surgical follow-up.
Collapse
Affiliation(s)
- G Ferragut
- Laboratorio de Immunología, Regional Norte, Universidad de la República, Osimani, Salto, Uruguay
| | | | | |
Collapse
|
33
|
Baz A, Carol H, Marco M, Casabó L, Jones F, Dunne D, Nieto A. Fc-binding molecules specific for human IgG1 and IgG3 are present in Echinococcus granulosus protoscoleces. Parasite Immunol 1998; 20:399-404. [PMID: 9767606 DOI: 10.1046/j.1365-3024.1998.00147.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In this work we describe the presence of Fc-binding activity on the suckers and tegument of E. granulosus protoscoleces. A fraction (PSA-Fc+) from protoscolex somatic antigens was isolated by affinity chromatography on human Fc-gamma1-Sepharose. Analysis by SDS-PAGE of PSA-Fc+ showed that it contained two major components. Using mouse F(ab')2-human Fc chimaeric monoclonal antibodies we verified that PSA-Fc+ bound mainly to human Fc-gamma1 and Fc-gamma3 isotypes. In addition, one of the components of PSA-Fc+ showed proteolytic activity. Both, Fc-binding and proteolytic activities localized on the protoscolex surface, may play a relevant role in the host-parasite interaction.
Collapse
Affiliation(s)
- A Baz
- Cátedra de Inmunologá, Casilla de Correos 1157, Facultad de Química, Facultad de Ciencias, Montevideo, Uruguay
| | | | | | | | | | | | | |
Collapse
|
34
|
Khoo KH, Nieto A, Morris HR, Dell A. Structural characterization of the N-glycans from Echinococcus granulosus hydatid cyst membrane and protoscoleces. Mol Biochem Parasitol 1997; 86:237-48. [PMID: 9200129 DOI: 10.1016/s0166-6851(97)00036-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Infection by the tapeworm Echinococcus granulosus in the intermediate host results in the development of a hydatid cyst which contains the protoscoleces within a fluid-filled cavity enclosed by the bilayered cyst membrane. N-glycans were enzymatically released from crude extracts of homogenates of hydatid cyst membranes and protoscoleces and their structures were defined by high sensitivity fast atom bombardment mass spectrometry in conjunction with sequential exoglycosidase digestions. The major N-glycans from the cyst membrane were found to be non-charged structures having complex-type antennae and core fucosylation. The antennae are either truncated at the first N-acetylglucosamine or are extended with beta-galactose to form N-acetyllactosamine (lacNAc). A significant proportion of the lacNAc backbones are capped by alpha-galactose. The resulting Gal alpha-Gal beta-terminal structures may account for the earlier observation that antibodies against the blood group P1 epitope recognise components of hydatid cyst extracts. The complex-type N-glycans identified in the protoscoleces extracts were the same as the neutral structures found in the cyst membrane but a small proportion of high mannose structures and truncated di- and trimannosyl core structures were also identified. Sialylated N-glycans were identified as minor constituents of the cyst membrane preparation but were not observed in protoscoleces extracts. Whether the sialylated glycans are host derived or endogenously synthesized by the parasite remains to be established. This is the first reported structural analysis of N-glycans from cestodes and provides new insights into protein glycosylation in helminths.
Collapse
Affiliation(s)
- K H Khoo
- Department of Biochemistry, Imperial College, London, UK
| | | | | | | |
Collapse
|