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dc.creatorBernardes, Carla Polyana Oliveira Silva-
dc.date.accessioned2025-08-08T16:12:05Z-
dc.date.available2025-08-08T16:12:05Z-
dc.date.issued2024-12-20-
dc.identifier.citationBERNARDES, Carla Polyana Oliveira Silva. Estudo do papel do lpg2 na migração de células dendríticas infectadas por Leishmania infantum. Orientadora: Juliana Perrone Bezerra de Menezes Fullam; Coorientadora: Valéria de Matos Borges. 2024. 81 f. Dissertação (Mestrado em Patologia Humana e Experimental) - Faculdade de Medicina da Bahia, Universidade Federal da Bahia; Instituto Gonçalo Moniz, Fundação Oswaldo Cruz, Salvador (BA), 2024.pt_BR
dc.identifier.urihttps://repositorio.ufba.br/handle/ri/42693-
dc.description.abstractINTRODUCTION: Leishmaniasis is a zoonosis caused by protozoa of the genus Leishmania, which can manifest in different clinical forms. The dissemination and homing of infected cells containing Leishmania antigens are critical for the parasite's survival in the host and for lesion establishment. In addition to host factors, intrinsic factors of the parasite are important for maintaining infection in the host. Recent studies highlight the importance of Leishmania lipophosphoglycan (LPG) in the interaction with host cells, the parasite's survival mechanisms, and the establishment of infection. However, the relationship between LPG and dendritic cell migration remains to be elucidated, considering that these cells are responsible for capturing, processing, and presenting antigens, as well as regulating the migration of immune cells to infection sites. Their interaction with the Leishmania parasite is crucial for the visceralization of infection and disease control. OBJECTIVE: Thus, this study aims to evaluate the role of lpg2 in the migration of human host cells infected by L. infantum. METHODS: Human dendritic cells were cultured, infected with wild-type L. infantum, Δlpg2, or Δlpg2 + lpg2, and subjected to migration in a Transwell system. Additionally, immunostaining was performed with antibodies against pFAK and pPaxillin to evaluate adhesion complex formation; Talin and Vinculin to assess podosome formation; and Rac1, Cdc42, Gelsolin, RhoA, and phalloidin to evaluate actin polymerization using confocal microscopy. Furthermore, the expression of CCR7 in dendritic cells infected by different Leishmania strains was assessed by flow cytometry. Finally, to investigate the activation of the ERK1/2 signaling pathway, we evaluated the expression of ERK1/2 protein using the western blot technique. RESULTS: The results demonstrate a reduction in dendritic cell migration following infection with L. infantum Δlpg2 compared to cells infected with the wild-type or Δlpg2 + lpg2, which is associated with reduced adhesion complex formation, podosome formation, and actin dynamics. Additionally, lower CCR7 and ERK1/2 expression was observed in dendritic cells infected by L. infantum Δlpg2 compared to cells infected with the wild-type or Δlpg2 + lpg2. CONCLUSIONS: The data presented in this study suggest that L. infantum LPG positively modulates the migration of human dendritic cells by enhancing adhesion complex formation, podosome formation, and actin dynamics in these cells, as well as increasing CCR7 expression and ERK1/2 pathway activation. Additional experiments are needed to better understand the role of LPG in modulating these cells infected by L. infantum.pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)pt_BR
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado da Bahia (FAPESB)pt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal da Bahiapt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectCélulas dendríticaspt_BR
dc.subjectMigraçãopt_BR
dc.subjectLeishmaniapt_BR
dc.subjectLipofosfoglicanopt_BR
dc.subjectLPGpt_BR
dc.subject.otherDendritic cellspt_BR
dc.subject.otherMigrationpt_BR
dc.subject.otherLeishmaniapt_BR
dc.subject.otherLipophosphoglycanpt_BR
dc.subject.otherLPGpt_BR
dc.titleEstudo do papel do lpg2 na migração de células dendríticas infectadas por Leishmania infantumpt_BR
dc.title.alternativeStudy of the role of lpg2 in the migration of dendritic cells infected by Leishmania infantumpt_BR
dc.typeDissertaçãopt_BR
dc.publisher.programPós-Graduação em Patologia Humana e Patologia Experimental (PGPAT) pt_BR
dc.publisher.initialsUFBApt_BR
dc.publisher.countryBrasilpt_BR
dc.subject.cnpqCiências Biológicaspt_BR
dc.contributor.advisor1Fullam, Juliana Perrone Bezerra de Menezes-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-9380-8839pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/2470641914861227pt_BR
dc.contributor.advisor-co1Borges, Valeria de Matos-
dc.contributor.advisor-co1IDhttps://orcid.org/0000-0002-2775-5409pt_BR
dc.contributor.advisor-co1Latteshttp://lattes.cnpq.br/1527671960187811pt_BR
dc.contributor.referee1Lima, Jonilson Berlink-
dc.contributor.referee1IDhttps://orcid.org/0000-0002-1403-4768pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/3542166602698730pt_BR
dc.contributor.referee2Santos, Washington Luis Conrado dos-
dc.contributor.referee2IDhttps://orcid.org/0000-0002-5075-1254pt_BR
dc.contributor.referee2Latteshttp://lattes.cnpq.br/9255856779100547pt_BR
dc.contributor.referee3Fullam, Juliana Perrone Bezerra de Menezes-
dc.contributor.referee3IDhttps://orcid.org/0000-0002-9380-8839pt_BR
dc.contributor.referee3Latteshttp://lattes.cnpq.br/2470641914861227pt_BR
dc.creator.IDhttps://orcid.org/0009-0004-1245-7072pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/2293696247204954pt_BR
dc.description.resumoINTRODUÇÃO: A leishmaniose é uma zoonose causada por protozoários do gênero Leishmania, que pode se manifestar de diferentes formas clínicas. A disseminação e homing de células infectadas contendo antígenos de Leishmania são fundamentais para a sobrevivência do parasito no hospedeiro e para o estabelecimento da lesão. Além de fatores do hospedeiro, fatores intrísecos ao parasito são importantes para a manutenção da infecção no hospedeiro. Estudos recentes destacam a importância do lipofosfoglicano (LPG) de Leishmania na interação com células hospedeiras, no mecanismo de sobrevivência do parasito e no estabelecimento da infecção. No entanto, a relação entre o LPG e a migração de células dendríticas ainda precisa ser elucidada, considerando que essas células são responsáveis pela captura, processamento e apresentação de antígenos, além de regularem a migração de células imunes para os locais de infecção. E sua interação com o parasito Leishmania é crucial para a visceralização da infecção e o controle da doença. OBJETIVO: Desta forma, o objetivo deste trabalho é avaliar o papel do lpg2 na migração de células hospedeiras humanas infectadas por L. infantum. MÉTODOS: As células dendríticas humanas foram cultivadas, infectadas por L. infantum selvagem, Δlpg2 ou Δlpg2 + lpg2, e submetidas à migração em sistema Transwell. Além disso, foram realizadas imunomarcações com os anticorpos para pFAK e pPaxilina para avaliar a formação de complexos de adesão, Talina e Vinculina para avaliação de podossomos e Rac1, Cdc42, Gelsolina e RhoA, além de faloidina, para avaliar a polimerização de actina, utilizando microscopia confocal. Adicionalmente, a expressão de CCR7 em células dendríticas infectadas pelas diferentes cepas de Leishmania foi avaliada por citometria de fluxo. Por fim, para investigar a ativação da via de sinalização ERK1/2, avaliamos a expressão da proteína ERK1/2 através da técnica de western blot. RESULTADOS: Os resultados encontrados demonstram uma redução da migração de células dendríticas após a infecção por L. infantum Δlpg2, em comparação com células infectadas por selvagem ou Δlpg2 + lpg2, associado a uma redução da formação de complexos de adesão, de podossomos e da dinâmica de actina. Adicionalmente, foi observada uma menor expressão de CCR7 e ERK1/2 em células dendríticas infectadas por L. infantum Δlpg2, em comparação com células infectadas por selvagem ou Δlpg2 + lpg2. CONCLUSÕES: Os dados apresentados neste trabalho sugerem que o LPG de L. infantum modula positivamente a migração de células dendríticas humana, mediante ao aumento da formação de complexos de adesão, de podossomos e da dinâmica de actina nessas células, além de um aumento da expressão do CCR7 e ativação da via de ERK1/2. Experimentos adicionais são necessários para melhor compreender o papel do LPG na modulação nessas células infectada por L. infantum.pt_BR
dc.publisher.departmentFaculdade de Medicina da Bahiapt_BR
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