Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico
Ano de defesa: | 2015 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Pontif?cia Universidade Cat?lica do Rio Grande do Sul
|
Programa de Pós-Graduação: |
Programa de P?s-Gradua??o em Biologia Celular e Molecular
|
Departamento: |
Faculdade de Bioci?ncias
|
País: |
Brasil
|
Palavras-chave em Português: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://tede2.pucrs.br/tede2/handle/tede/6711 |
Resumo: | Angiostrongylus cantonensis is a nematode parasite, main etiologic agent of the eosinophilic meningitis (EM) in humans, a disease endemic in many tropical and sub tropical countries. The diagnosis of EM involves clinical evaluation, eosinophils counting >10% in liquor, and consuming historical of raw mollusks, as they are the intermediate hosts of the Angiostrongylus. Definitive diagnosis through larvae visualization in the liquor is rare. Serological test, mainly involving the 31-kDa component detection, which presents high sensitivity and specificity, has been employed as an alternative way for diagnostic. The 31-kDa antigen is composed for glycoproteins and tentatives in producing it in a recombinant way, using either prokaryotic or eukaryotic models, were inable to mantain immunological recognition, probably due the lack or deficient glycosilation of the molecules. Due the lack of information about A. cantonensis glycans and the need of producing a standard antigen able to be used worldwide in a diagnostic test, the main goal of this work was to study the A. cantonensis glycan profile and their role on the immune diagnosis of EM. It was used total soluble extract (TE) and excretory-secretory products (ES) as sources of glycans and glycoconjugates. The N-linked glycans and glycoconjugates from A. cantonensis female TE and 31-kDa antigen were analyzed and identified by mass spectrometry (MS) and lectin array, and the immunogenecity of these molecules were characterized by dot blot and Western blots. Furthermore, It was investigated the biosynthesis routes of glycans using in silico analysis of the Angiostrongylus genome and transcriptome dataset. N-glycans containing complex structures, with truncated antennas containing terminal with galactose and N-acetylgalactosamine, and core ?1-6 fucosylated were identified. Lectin array analysis could also dentify Gal and GalNAc structures in Angiostrongylus glycoconjugates. Eight genes involved with biosynthesis of N-glycans, among them GCS1; GANAB, MAN1, MGAT2 and FUT8; and three involved with O-glycan biosynthesis, GALNT, C1GALT1 e OFUT1 were found by in silico analysis. Immunogenicity of the 31-kDa antigen is tottaly dependent of N-glycans and not to O-glycans. Modeling of proteins of the 31kDa component showed N-glycosilation sites and predicted structures that were the same identified by MS analysis. Taking together, the data generated in this study shown the glycan importance for angiostrongyliasis diagnosis and also the glycan repertoire that Angiostrongylus produces. This work is an important contribution to the development of a standard diagnosis for EM and also for new perspectives in the study of angiostrongyliasis diagnosis, parasite biology and host-parasite relationship. |
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Graeff-Teixeira, Carlos287.446.750-20http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787517D8Morassutti, Alessandra Loureirohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4761494H7834.456.680-00http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4231134A1Ver?ssimo, Carolina De Marco2016-05-30T16:54:35Z2015-08-31http://tede2.pucrs.br/tede2/handle/tede/6711Angiostrongylus cantonensis is a nematode parasite, main etiologic agent of the eosinophilic meningitis (EM) in humans, a disease endemic in many tropical and sub tropical countries. The diagnosis of EM involves clinical evaluation, eosinophils counting >10% in liquor, and consuming historical of raw mollusks, as they are the intermediate hosts of the Angiostrongylus. Definitive diagnosis through larvae visualization in the liquor is rare. Serological test, mainly involving the 31-kDa component detection, which presents high sensitivity and specificity, has been employed as an alternative way for diagnostic. The 31-kDa antigen is composed for glycoproteins and tentatives in producing it in a recombinant way, using either prokaryotic or eukaryotic models, were inable to mantain immunological recognition, probably due the lack or deficient glycosilation of the molecules. Due the lack of information about A. cantonensis glycans and the need of producing a standard antigen able to be used worldwide in a diagnostic test, the main goal of this work was to study the A. cantonensis glycan profile and their role on the immune diagnosis of EM. It was used total soluble extract (TE) and excretory-secretory products (ES) as sources of glycans and glycoconjugates. The N-linked glycans and glycoconjugates from A. cantonensis female TE and 31-kDa antigen were analyzed and identified by mass spectrometry (MS) and lectin array, and the immunogenecity of these molecules were characterized by dot blot and Western blots. Furthermore, It was investigated the biosynthesis routes of glycans using in silico analysis of the Angiostrongylus genome and transcriptome dataset. N-glycans containing complex structures, with truncated antennas containing terminal with galactose and N-acetylgalactosamine, and core ?1-6 fucosylated were identified. Lectin array analysis could also dentify Gal and GalNAc structures in Angiostrongylus glycoconjugates. Eight genes involved with biosynthesis of N-glycans, among them GCS1; GANAB, MAN1, MGAT2 and FUT8; and three involved with O-glycan biosynthesis, GALNT, C1GALT1 e OFUT1 were found by in silico analysis. Immunogenicity of the 31-kDa antigen is tottaly dependent of N-glycans and not to O-glycans. Modeling of proteins of the 31kDa component showed N-glycosilation sites and predicted structures that were the same identified by MS analysis. Taking together, the data generated in this study shown the glycan importance for angiostrongyliasis diagnosis and also the glycan repertoire that Angiostrongylus produces. This work is an important contribution to the development of a standard diagnosis for EM and also for new perspectives in the study of angiostrongyliasis diagnosis, parasite biology and host-parasite relationship.Angiostrongylus cantonensis ? um nemat?deo parasita, principal agente etiol?gico da meningite eosinof?lica (ME) em humanos, doen?a end?mica em diversos pa?ses tropicais e subtropicais. A ME se caracteriza pela eosinofilia >10% no l?quor, e hist?rico de ingest?o de moluscos crus, j? que estes s?o hospedeiros intermedi?rios do Angiostrongylus. O diagn?stico definitivo ? raramente poss?vel atrav?s da visualiza??o da larva no liquor. Testes sorol?gicos envolvendo principalmente a detec??o do componente de 31-kDa, que apresenta alta sensibilidade e especificidade, tem sido empregados como uma alternativa diagn?stica. O ant?geno de 31-kDa ? composto por glicoprote?nas e tentativas em produzi-lo de maneira recombinante, em modelos procari?ticos ou eucari?ticos, n?o tiveram sucesso em manter o reconhecimento imunol?gico, provavelmente pela incorreta ou insuficiente glicosila??o das mol?culas. Devido ? falta de informa??o sobre glic?dios de A. cantonensis e a necessidade de produzir um ant?geno padr?o capaz de ser usado em um teste de diagn?stico para distribui??o mundial, o objetivo principal deste trabalho foi estudar o perfil glic?dico de A. cantonensis e o papel dessas mol?culas no imunodiagn?stico da ME. Foram utilizados extratos sol?veis totais (ET) de vermes adultos machos e f?meas e produtos de excre??o e secre??o (ES) como fontes dos glic?dios e glicoconjugados estudados. Os N-glic?dios e glicoconjugados do ET de verme f?mea de A. cantonensis e o ant?geno de 31-kDa foram analisados e identificados por espectrometria de massa (EM) e lectina array, e a import?ncia imunog?nica destas mol?culas foi caracterizada por tratamento com glicosidases aliado a dot blot ou Western blot. Al?m disso, foi investigada a presen?a de enzimas envolvidas na s?ntese de diferentes glic?dios a partir de an?lises in silico do genoma e transcriptoma do Angiostrongylus. Diversos N-glic?dios foram identificados nas amostras analisadas. Estes continham estruturas complexas, com antenas truncadas contendo galactose e N-acetilgalactosamina em posi??es terminais e n?cleo ?1-6 fucosilado. As mesmas estruturas terminais foram identificadas pela an?lise de Lectin Array. Em rela??o a an?lise in s?lico da bioss?ntese de glic?dios em Angiostrongylus, foram identificados oito genes envolvidos na s?ntese de N-glic?dios, entre eles GCS1; GANAB, MAN1, MGAT2 e FUT8; e pelo menos tr?s genes envolvidos na s?ntese de O-glic?dios, GALNT, C1GALT1 e OFUT1. Os N-glic?dios se mostraram essenciais para a imunogenicidade do ant?geno de 31-kDa quando soros positivos para A. cantonensis foram testados. Uma modelagem in silico dos componentes de 31-kDa, demonstrou s?tios de glicosila??o para N-glic?dios, e previu as mesmas estruturas que foram identificadas por EM. Em conjunto, os dados gerados neste estudo mostraram a import?ncia de glic?dios para o diagn?stico de angiostrongil?ases e tamb?m o repert?rio de glic?dios que este parasito pode produzir. Este trabalho ? uma contribui??o importante para o desenvolvimento de um diagn?stico padr?o para a ME e tamb?m para novas perspectivas no estudo do diagn?stico de angiostrongil?ases, biologia do parasito e rela??o parasito-hospedeiro.Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2016-05-30T16:54:35Z No. of bitstreams: 1 TES_CAROLINA_DE_MARCO_VERISSIMO_COMPLETO.pdf: 3480923 bytes, checksum: c145d85afafb9cc7cd5782a17ac34cfb (MD5)Made available in DSpace on 2016-05-30T16:54:35Z (GMT). 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dc.title.por.fl_str_mv |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico |
dc.title.alternative.eng.fl_str_mv |
Glycan study of the Angiostrongylus cantonensis and their role on the immunodiagnosis |
title |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico |
spellingShingle |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico Ver?ssimo, Carolina De Marco TESTES IMUNOL?GICOS CARBOIDRATOS NEMAT?DEOS BIOLOGIA MOLECULAR CIENCIAS BIOLOGICAS::BIOLOGIA GERAL |
title_short |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico |
title_full |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico |
title_fullStr |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico |
title_full_unstemmed |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico |
title_sort |
Estudo de glic?dios de Angiostrongylus cantonensis e o papel no imunodiagn?stico |
author |
Ver?ssimo, Carolina De Marco |
author_facet |
Ver?ssimo, Carolina De Marco |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Graeff-Teixeira, Carlos |
dc.contributor.advisor1ID.fl_str_mv |
287.446.750-20 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787517D8 |
dc.contributor.advisor-co1.fl_str_mv |
Morassutti, Alessandra Loureiro |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4761494H7 |
dc.contributor.authorID.fl_str_mv |
834.456.680-00 |
dc.contributor.authorLattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4231134A1 |
dc.contributor.author.fl_str_mv |
Ver?ssimo, Carolina De Marco |
contributor_str_mv |
Graeff-Teixeira, Carlos Morassutti, Alessandra Loureiro |
dc.subject.por.fl_str_mv |
TESTES IMUNOL?GICOS CARBOIDRATOS NEMAT?DEOS BIOLOGIA MOLECULAR |
topic |
TESTES IMUNOL?GICOS CARBOIDRATOS NEMAT?DEOS BIOLOGIA MOLECULAR CIENCIAS BIOLOGICAS::BIOLOGIA GERAL |
dc.subject.cnpq.fl_str_mv |
CIENCIAS BIOLOGICAS::BIOLOGIA GERAL |
description |
Angiostrongylus cantonensis is a nematode parasite, main etiologic agent of the eosinophilic meningitis (EM) in humans, a disease endemic in many tropical and sub tropical countries. The diagnosis of EM involves clinical evaluation, eosinophils counting >10% in liquor, and consuming historical of raw mollusks, as they are the intermediate hosts of the Angiostrongylus. Definitive diagnosis through larvae visualization in the liquor is rare. Serological test, mainly involving the 31-kDa component detection, which presents high sensitivity and specificity, has been employed as an alternative way for diagnostic. The 31-kDa antigen is composed for glycoproteins and tentatives in producing it in a recombinant way, using either prokaryotic or eukaryotic models, were inable to mantain immunological recognition, probably due the lack or deficient glycosilation of the molecules. Due the lack of information about A. cantonensis glycans and the need of producing a standard antigen able to be used worldwide in a diagnostic test, the main goal of this work was to study the A. cantonensis glycan profile and their role on the immune diagnosis of EM. It was used total soluble extract (TE) and excretory-secretory products (ES) as sources of glycans and glycoconjugates. The N-linked glycans and glycoconjugates from A. cantonensis female TE and 31-kDa antigen were analyzed and identified by mass spectrometry (MS) and lectin array, and the immunogenecity of these molecules were characterized by dot blot and Western blots. Furthermore, It was investigated the biosynthesis routes of glycans using in silico analysis of the Angiostrongylus genome and transcriptome dataset. N-glycans containing complex structures, with truncated antennas containing terminal with galactose and N-acetylgalactosamine, and core ?1-6 fucosylated were identified. Lectin array analysis could also dentify Gal and GalNAc structures in Angiostrongylus glycoconjugates. Eight genes involved with biosynthesis of N-glycans, among them GCS1; GANAB, MAN1, MGAT2 and FUT8; and three involved with O-glycan biosynthesis, GALNT, C1GALT1 e OFUT1 were found by in silico analysis. Immunogenicity of the 31-kDa antigen is tottaly dependent of N-glycans and not to O-glycans. Modeling of proteins of the 31kDa component showed N-glycosilation sites and predicted structures that were the same identified by MS analysis. Taking together, the data generated in this study shown the glycan importance for angiostrongyliasis diagnosis and also the glycan repertoire that Angiostrongylus produces. This work is an important contribution to the development of a standard diagnosis for EM and also for new perspectives in the study of angiostrongyliasis diagnosis, parasite biology and host-parasite relationship. |
publishDate |
2015 |
dc.date.issued.fl_str_mv |
2015-08-31 |
dc.date.accessioned.fl_str_mv |
2016-05-30T16:54:35Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/doctoralThesis |
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doctoralThesis |
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http://tede2.pucrs.br/tede2/handle/tede/6711 |
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http://tede2.pucrs.br/tede2/handle/tede/6711 |
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por |
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por |
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8198246930096637360 |
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600 600 600 600 |
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36528317262667714 |
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-1634559385931244697 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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Pontif?cia Universidade Cat?lica do Rio Grande do Sul |
dc.publisher.program.fl_str_mv |
Programa de P?s-Gradua??o em Biologia Celular e Molecular |
dc.publisher.initials.fl_str_mv |
PUCRS |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Faculdade de Bioci?ncias |
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Pontif?cia Universidade Cat?lica do Rio Grande do Sul |
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