Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/17925 |
Resumo: | Acute leptospirosis has a large part of its clinical manifestations as a function of the vascular injury with endothelial cell damage provided by the infection. Fever, jaundice, renal failure, nephritis, hemolytic anemia, hemoglobinuria, and fatal pulmonary haemorrhage are relevant clinical features. The lesion is probably due to deposits of immune complexes in the small vessels of the affected organs. The activation of the immune response determines the release of several humoral factors, generating the inflammatory process. Oxidative mechanisms are directly involved and correlate with changes in iron metabolism during disease. Kidney tissue is strongly affected by infection. However, the mechanisms involved in anemia, with or without hemolysis, thrombocytopenia related to nonclinical bleeding, and renal antioxidant pathophysiology during acute infection are poorly understood. The objective of this work was to determine, in a first experiment, the presence of immunoglobulins associated with the erythrocyte and platelet wall, to establish the magnitude of the involvement of platelet microparticles and its relation with classic laboratory hemostasis markers. For this purpose, 18 male animals were used, with 60 days divided into 2 groups (6 healthy controls and 12 infected by experimental inoculation with Leptospira interrogans Sorovar Canicola), which had blood samples collected on the 4th day after experimental infection. In a second experiment the objective was to evaluate the antioxidant and histoprotective effect of deferoxamine at renal tissue level. Also, 18 animals were submitted to the same inoculation, divided into 4 groups: C and CT (control and treated) 3 animals each, I and IT (infected and infected treated) 6 animals each. Animals of the CT and IT groups received 50mg / kg of deferoxamine on days -1, 0, 1, 2 and 3. Blood was collected and serum dosages of ferric metabolism and euthanasia were also performed on the 4th day post infection. Renal tissue was submitted to evaluation of oxidative lesion, antioxidant and inflammatory status and histopathological evaluation. Infected animals presented clinical bleeding, decreased platelet count, changes in hemostatic parameters (increase in PT, APTT, and decrease in fibrinogen), increase in platelet microparticles and increase in anti-erythrocyte IgG. Treatment with deroxamine provided reduction of renal damage assessed by TBARS, GSSH / GSSG ratio, tissue acetylcholinesterase. Histopathological evaluation measured the tissue aggression caused by the infection and pointed to protection, at the tubular level, by deferoxamine. It was possible to conclude, therefore, that the experimental infection causes important changes from the pathophysiological point of view demonstrating involvement of the immune system in the pre-hemolytic erythrocyte level and that immune-mediated factors do not seem to be correlated with thrombocytopenia. There is involvement of microparticles in the modulation of thrombotic response and, furthermore, deferoxamine presented an important antioxidant, antiinflammatory and histoprotective action in renal tissue. |
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Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxaminaExperimental leptospirosis: anti-erythrocyte IgG, hemostatic changes and reduction of renal injury by deferoxamineLeptospiroseAnemiaTrombocitopeniaQuelanteHistopatologia renalLeptospirosisThrombocytopeniaChelationRenal histopathologyCNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIAAcute leptospirosis has a large part of its clinical manifestations as a function of the vascular injury with endothelial cell damage provided by the infection. Fever, jaundice, renal failure, nephritis, hemolytic anemia, hemoglobinuria, and fatal pulmonary haemorrhage are relevant clinical features. The lesion is probably due to deposits of immune complexes in the small vessels of the affected organs. The activation of the immune response determines the release of several humoral factors, generating the inflammatory process. Oxidative mechanisms are directly involved and correlate with changes in iron metabolism during disease. Kidney tissue is strongly affected by infection. However, the mechanisms involved in anemia, with or without hemolysis, thrombocytopenia related to nonclinical bleeding, and renal antioxidant pathophysiology during acute infection are poorly understood. The objective of this work was to determine, in a first experiment, the presence of immunoglobulins associated with the erythrocyte and platelet wall, to establish the magnitude of the involvement of platelet microparticles and its relation with classic laboratory hemostasis markers. For this purpose, 18 male animals were used, with 60 days divided into 2 groups (6 healthy controls and 12 infected by experimental inoculation with Leptospira interrogans Sorovar Canicola), which had blood samples collected on the 4th day after experimental infection. In a second experiment the objective was to evaluate the antioxidant and histoprotective effect of deferoxamine at renal tissue level. Also, 18 animals were submitted to the same inoculation, divided into 4 groups: C and CT (control and treated) 3 animals each, I and IT (infected and infected treated) 6 animals each. Animals of the CT and IT groups received 50mg / kg of deferoxamine on days -1, 0, 1, 2 and 3. Blood was collected and serum dosages of ferric metabolism and euthanasia were also performed on the 4th day post infection. Renal tissue was submitted to evaluation of oxidative lesion, antioxidant and inflammatory status and histopathological evaluation. Infected animals presented clinical bleeding, decreased platelet count, changes in hemostatic parameters (increase in PT, APTT, and decrease in fibrinogen), increase in platelet microparticles and increase in anti-erythrocyte IgG. Treatment with deroxamine provided reduction of renal damage assessed by TBARS, GSSH / GSSG ratio, tissue acetylcholinesterase. Histopathological evaluation measured the tissue aggression caused by the infection and pointed to protection, at the tubular level, by deferoxamine. It was possible to conclude, therefore, that the experimental infection causes important changes from the pathophysiological point of view demonstrating involvement of the immune system in the pre-hemolytic erythrocyte level and that immune-mediated factors do not seem to be correlated with thrombocytopenia. There is involvement of microparticles in the modulation of thrombotic response and, furthermore, deferoxamine presented an important antioxidant, antiinflammatory and histoprotective action in renal tissue.Leptospirose aguda tem grande parte de suas manifestações clínicas em função da lesão vascular com dano às células endoteliais proporcionada pela infecção. Febre, icterícia, insuficiência renal, nefrite, anemia hemolítica, hemoglobinúria, e hemorragia pulmonar fatal são características clínicas relevantes. A lesão é provavelmente devida a depósitos de complexos imunes nos pequenos vasos dos órgãos acometidos. A ativação da resposta imune determina a liberação de diversos fatores humorais, gerando o processo inflamatório. Mecanismos oxidativos estão diretamente envolvidos e se correlacionam com alterações no metabolismo do ferro durante a doença. O tecido renal é fortemente afetado pela infecção. No entanto, os mecanismos envolvidos na anemia, com ou sem hemólise, trombocitopenia relacionada ou não com sangramento clínico e fisiopatologia antioxidante renal durante a infecção aguda estão poucos compreendidos. O objetivo deste trabalho foi determinar, em um primeiro experimento, a presença de imunoglobulinas associadas à parede dos eritrócitos e plaquetas, estabelecer a magnitude do envolvimento de micropartículas plaquetárias e sua relação com marcadores laboratoriais clássicos de hemostasia. Para tanto foram utilizados, 18 animais, machos, com 60 dias divididos em 2 grupos (6 controles saudáveis e 12 infectados por inoculação experimental com Leptospira interrogans Sorovar Canicola), os quais tiveram amostras de sangue coletadas no 4° dias pós infecção experimental. Num segundo experimento objetivou-se avaliar o efeito antioxidante e histoprotetor de deferoxamina em nível de tecido renal, utilizando 18 animais, divididos em 4 grupos : C e CT (controle e controle tratado) 3 animais cada, I e IT (infectado e infectado tratado) 6 animais cada, os quais foram submetidos à mesma inoculação. Os animais dos grupos CT e IT receberam 50mg/kg de deferoxamina nos dias -1, 0, 1, 2 e 3. Fez-se a coleta de sangue para dosagens séricas de metabolismo férrico e a eutanásia foi realizada também no 4º dia pós infecção. Tecido renal foi submetido à avaliação de lesão oxidativa, status antioxidante e inflamatório e avaliação histopatológica. Os animais infectados apresentaram sangramento clínico, decréscimo na contagem de plaquetas, alterações nos parâmetros hemostáticos (aumento de TP, TTPA, e decréscimo de fibrinogênio) aumento de micropatículas plaquetárias e aumento da IgG anti-eritrocitária. O tratamento com deferoxamina proporcionou redução de dano renal avaliada por TBARS, razão GSSH/GSSG e acetilcolinesterases teciduais. Avalição histopatológica mensurou a agressão tecidual causada pela infecção e apontou proteção, sobretudo em nível tubular, por deferoxamina. Foi possível concluir, portanto, que a infecção experimental provoca alterações importantes do ponto de vista fisiopatológico demonstrando envolvimento do sistema imune em nível eritrocitário pré-hemolítco e que fatores imunomediados não parecem estar correlacionados com a trombocitopenia. Há envolvimento de micropartículas na modulação de resposta trombótica e, ainda, deferoxamina apresentou importante ação antioxidante, antiinflamatória e histoprotetora no tecido renal.Universidade Federal de Santa MariaBrasilMedicina VeterináriaUFSMPrograma de Pós-Graduação em Medicina VeterináriaCentro de Ciências RuraisLopes, Sonia Terezinha dos Anjoshttp://lattes.cnpq.br/8059723754130756Silva, Aleksandro Schafer dahttp://lattes.cnpq.br/3485147800868305Leal, Marta Lizandra do Rêgohttp://lattes.cnpq.br/6859797230596402Pillat, Micheli Mainardihttp://lattes.cnpq.br/5712882578120587Wolkmer, Patriciahttp://lattes.cnpq.br/5142205719893657Sobroza, Ânderson Oliveira2019-08-14T21:15:33Z2019-08-14T21:15:33Z2016-12-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/17925porAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2019-08-15T06:02:45Zoai:repositorio.ufsm.br:1/17925Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2019-08-15T06:02:45Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina Experimental leptospirosis: anti-erythrocyte IgG, hemostatic changes and reduction of renal injury by deferoxamine |
title |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina |
spellingShingle |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina Sobroza, Ânderson Oliveira Leptospirose Anemia Trombocitopenia Quelante Histopatologia renal Leptospirosis Thrombocytopenia Chelation Renal histopathology CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA |
title_short |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina |
title_full |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina |
title_fullStr |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina |
title_full_unstemmed |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina |
title_sort |
Leptospirose experimental: IgG anti-eritrócitos , alterações hemostáticas e redução da lesão renal por deferoxamina |
author |
Sobroza, Ânderson Oliveira |
author_facet |
Sobroza, Ânderson Oliveira |
author_role |
author |
dc.contributor.none.fl_str_mv |
Lopes, Sonia Terezinha dos Anjos http://lattes.cnpq.br/8059723754130756 Silva, Aleksandro Schafer da http://lattes.cnpq.br/3485147800868305 Leal, Marta Lizandra do Rêgo http://lattes.cnpq.br/6859797230596402 Pillat, Micheli Mainardi http://lattes.cnpq.br/5712882578120587 Wolkmer, Patricia http://lattes.cnpq.br/5142205719893657 |
dc.contributor.author.fl_str_mv |
Sobroza, Ânderson Oliveira |
dc.subject.por.fl_str_mv |
Leptospirose Anemia Trombocitopenia Quelante Histopatologia renal Leptospirosis Thrombocytopenia Chelation Renal histopathology CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA |
topic |
Leptospirose Anemia Trombocitopenia Quelante Histopatologia renal Leptospirosis Thrombocytopenia Chelation Renal histopathology CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA |
description |
Acute leptospirosis has a large part of its clinical manifestations as a function of the vascular injury with endothelial cell damage provided by the infection. Fever, jaundice, renal failure, nephritis, hemolytic anemia, hemoglobinuria, and fatal pulmonary haemorrhage are relevant clinical features. The lesion is probably due to deposits of immune complexes in the small vessels of the affected organs. The activation of the immune response determines the release of several humoral factors, generating the inflammatory process. Oxidative mechanisms are directly involved and correlate with changes in iron metabolism during disease. Kidney tissue is strongly affected by infection. However, the mechanisms involved in anemia, with or without hemolysis, thrombocytopenia related to nonclinical bleeding, and renal antioxidant pathophysiology during acute infection are poorly understood. The objective of this work was to determine, in a first experiment, the presence of immunoglobulins associated with the erythrocyte and platelet wall, to establish the magnitude of the involvement of platelet microparticles and its relation with classic laboratory hemostasis markers. For this purpose, 18 male animals were used, with 60 days divided into 2 groups (6 healthy controls and 12 infected by experimental inoculation with Leptospira interrogans Sorovar Canicola), which had blood samples collected on the 4th day after experimental infection. In a second experiment the objective was to evaluate the antioxidant and histoprotective effect of deferoxamine at renal tissue level. Also, 18 animals were submitted to the same inoculation, divided into 4 groups: C and CT (control and treated) 3 animals each, I and IT (infected and infected treated) 6 animals each. Animals of the CT and IT groups received 50mg / kg of deferoxamine on days -1, 0, 1, 2 and 3. Blood was collected and serum dosages of ferric metabolism and euthanasia were also performed on the 4th day post infection. Renal tissue was submitted to evaluation of oxidative lesion, antioxidant and inflammatory status and histopathological evaluation. Infected animals presented clinical bleeding, decreased platelet count, changes in hemostatic parameters (increase in PT, APTT, and decrease in fibrinogen), increase in platelet microparticles and increase in anti-erythrocyte IgG. Treatment with deroxamine provided reduction of renal damage assessed by TBARS, GSSH / GSSG ratio, tissue acetylcholinesterase. Histopathological evaluation measured the tissue aggression caused by the infection and pointed to protection, at the tubular level, by deferoxamine. It was possible to conclude, therefore, that the experimental infection causes important changes from the pathophysiological point of view demonstrating involvement of the immune system in the pre-hemolytic erythrocyte level and that immune-mediated factors do not seem to be correlated with thrombocytopenia. There is involvement of microparticles in the modulation of thrombotic response and, furthermore, deferoxamine presented an important antioxidant, antiinflammatory and histoprotective action in renal tissue. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-12-02 2019-08-14T21:15:33Z 2019-08-14T21:15:33Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/17925 |
url |
http://repositorio.ufsm.br/handle/1/17925 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Medicina Veterinária UFSM Programa de Pós-Graduação em Medicina Veterinária Centro de Ciências Rurais |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Medicina Veterinária UFSM Programa de Pós-Graduação em Medicina Veterinária Centro de Ciências Rurais |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
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Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
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1805922080993050624 |