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Thèse de Doctorat
DOI
10.11606/T.42.2013.tde-07062014-121802
Document
Auteur
Nom complet
Karen Tiago dos Santos
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 2013
Directeur
Jury
Costa, Soraia Kátia Pereira (Président)
Antunes, Edson
Lima, Wothan Tavares de
Martins, Joilson de Oliveira
Saldiva, Paulo Hilario Nascimento
Titre en portugais
Efeito da exposição precoce ao poluente 1,2-NQ sobre a resposta imune inata e adquirida de camundongos: papel dos receptores toll.
Mots-clés en portugais
Asma
Camundongos
Inflamação
Interações celulares
Poluição
Resumé en portugais
A poluição contribui para o agravamento da asma, principalmente em indivíduos susceptíveis. Achados prévios do grupo mostram que a exposição de camundongos neonatos, à 1,2-naftoquinona (1,2-NQ), um contaminante do material particulado eliminado do diesel (PED), aumentou a susceptibilidade à asma na idade adulta. Dados recentes mostram que as PEDs aumentam a expressão de receptores do tipo Toll (TLR) no pulmão de roedores, sugerindo que poluentes podem atuar como ligantes dos TLRs. Os objetivos deste estudo incluíram: 1) investigar o papel do TLR4 e os mecanismos de sinalização envolvidos na maior susceptibilidade à asma; 2) avaliar o perfil de células do sistema imunológico envolvidas na resposta inata/adaptativa. Demonstramos, que a exacerbação da asma em camundongos expostos precocemente à 1,2-NQ é modulada pela via de sinalização intracelular TLR4-MyD88. Conclui-se que contato de camundongos neonatos com a 1,2-NQ interfere na maturação e função de células do sistema imunológico, afeta a resposta adaptativa e, assim, promove o aumento da inflamatória alérgica.
Titre en anglais
Effect of early exposition to the air pollutant 1,2-NQ under innate imunity and adaptive response of mice: role of toll-like receptors.
Mots-clés en anglais
Asthma
Cellular interactions
Inflammation
Mice
Pollution
Resumé en anglais
Air pollution is a public health problem worldwide, related to the worsening of asthma, mainly in susceptible individual. Ours previous data showed that early-life exposure to the 1,2-naphthoquinone (1,2-NQ), one of those air contaminants adsorbed on diesel exhaust particles (DEP), increased the susceptibility to asthma at adulthood. Recent studies have been shown that DEP are able to increase Toll like receptors (TLR) mRNA expression of in the lungs of rodents, suggesting that environmental pollutants can act as TLRs ligands. This study aimed: 1) to investigate the role of TLR4 and the mechanisms involved in increased susceptibility to allergic inflammation; 2) evaluate immune cells population involved in innate/adaptive response. We demonstrate that aggravation of asthma in mice early exposed to 1,2-NQ is modulated by TLR4-MyD88 intracellular signaling pathway. We concluded that the short contact of individuals susceptible with 1,2-NQ interfere with immune cells maturation and function, which affect the adaptive response and thus promoted increase of asthma.
 
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Date de Libération
2018-06-10
Date de Publication
2014-06-11
 
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