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Previous issue date: 2012-02-03 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Introduction: Leishmaniasis is a tropical zoonoses that is endemic, causing different clinical forms including cutaneous, diffuse, disseminated, mucosal and visceral manifestations. The L. (V.) braziliensis is the most common parasite found in cutaneous leishmaniasis in Brazil and is the major agent for the mucosal leishmaniasis. The manifestation of the disease and the clinical forms are dependent on several factors related between the parasite and host.
Objective: The aim of this study was to compare the ability of amastigote parasite isolated from patients with cutaneous or mucosal leishmaniasis to stimulate the production of cytokines in peripheral blood mononuclear cells cultures (PBMC) obtained from health donors.
Methods: Isolates of patients with cutaneous or mucosal lesion were inoculated in IFNγ knockout mice to obtain amastigotes, which were purifyed by density using Percoll. The PBMCs from healthy individuals were separated by density using Ficoll. The cells were incubated in cultures at different times with amastigotes and then the supernatant were collect to quantify cytokines by ELISA or cells that are used to quantify cytokines using the real time PCR.
Results: PBMCs produced higher amounts of IL-1β, IL-6, IL-10 and TGFβ in cultures after stimulation with amastigotes than uninfected controls. When comparing isolates from cutaneous or mucosal disease it was not found differerence regarding to the production of IL-6, IL-10 and TGFβ, but amastigotes from patients with cutaneous leishmaniasis induced more IL-1β than in parasites obtained from mucosal lesion. Production of IFNγ IL17, and TNF was was not detected at different times after stimulation with L. (V.) braziliensis amastigotes.
Conclusion: The results suggest that amastigotes of patients with cutaneous leishmaniasis interact with innate immunity cells by inducing the production of proinflammatory or anti-inflammatory and isolated from mucosal lesions induce less IL-1 than parasites obtained from skin lesions. The greatest amount of IL-1 promotes an inflammatory response with migration of cells to the site of infection, so a low
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production would cause a slower disease and would prejudice an effective acquired response. Thus, the parasite would be able to survive longer in host in a silent way. / Introdução: A leishmaniose é uma zoonose tropical endêmica com diferentes formas clínicas, incluindo as formas cutânea, difusa, disseminada, mucosa e visceral. L. (V.) braziliensis é o parasito mais comumente encontrado na leishmaniose tegumentar no Brasil sendo, o principal agente da leishmaniose mucosa. A manifestação da doença e as formas clínicas existentes são dependentes de diversos fatores relacionados ao parasito e ao hospedeiro.
Objetivo: Comparar a habilidade de formas amastigotas isoladas de pacientes com leishmaniose cutânea ou mucosa em estimular a produção de citocinas em células mononucleares do sangue periférico (PBMCs) obtidas de doadores sadios.
Métodos: Isolados obtidos de pacientes com lesões cutâneas ou mucosas foram inoculados em camundongos deficientes de IFNγ para obtenção de formas amastigotas, que foram separadas por gradiente de densidade usando o Percoll. As PBMCs de indivíduos sadios foram separadas por gradiente de densidade usando o Ficoll e cultivadas por diferentes tempos com as formas amastigotas. O sobrenadante foi coletado para quantificar as citocinas por ELISA e as células restantes foram lisadas para análise do mRNA para citocinas usando o PCR em tempo real.
Resultados: As PBMCs produziram IL-1β, IL-6, IL-10 e TGFβ em culturas após a estimulação com amastigotas. Os isolados de lesões cutâneas produziram quantidades semelhantes de IL-6, IL-10 e TGFβ quando comparados com isolados de lesões mucosas. Formas amastigotas obtidas de pacientes com leishmaniose cutânea induziram uma maior produção de IL-1β do que parasitos obtidos de lesões mucosas. A produção de IFNγ, IL-17, e TNF não foi detectada em todos os tempos avaliados, após a estimulação com amastigotas de L. (V.) braziliensis.
Conclusão: Os resultados sugerem que formas amastigotas de pacientes com leishmaniose tegumentar interagem com células da imunidade inata, induzindo a produção de citocinas pró e anti inflamatórias, sendo que isolados oriundos de lesão mucosa induzem menos IL-1 do que parasitos obtidos de lesões cutâneas. A maior quantidade de IL-1 favorece uma resposta inflamatória com a migração de células para
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o local da infecção. Uma baixa produção dessa citocina faria com que a doença fosse mais lenta prejudicando a formação de uma resposta adquirida eficiente. Portanto, o parasito poderia ser capaz de sobreviver por um tempo maior no hospedeiro de uma maneira silenciosa, causando a forma mucosa.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.bc.ufg.br:tede/3199 |
| Date | 03 February 2012 |
| Creators | Gomes, Clayson Moura |
| Contributors | Oliveira, Milton Adriano Pelli de, Cruvinel, Wilson de Melo, Pfrimer, Irmtraut Araci Hoffmann, Oliveira, Milton Adriano Pelli de |
| Publisher | Universidade Federal de Goiás, Programa de Pós-graduação em Medicina Tropical e Saúde Publica (IPTSP), UFG, Brasil, Instituto de Patologia Tropical e Saúde Pública - IPTSP (RG) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFG, instname:Universidade Federal de Goiás, instacron:UFG |
| Rights | http://creativecommons.org/licenses/by-nc-nd/4.0/, info:eu-repo/semantics/openAccess |
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