Caracterização do perfil de monócitos: comparação da fenotipagem entre adultos e crianças sadias e em crianças portadoras de dermatite atópica

• Autor(a) principal: Paiva, Renata da Silveira Rodrigues
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/tede/8978
• topic: Monócitos; Citometria; Subpopulações de Monócitos; Resposta Inflamatória; Citocinas; Marcadores Celulares; Monocytes; Cytometry; Subpopulations of Monocytes; Inflammatory Response; Cytokines; Cell Markers; CIENCIAS BIOLOGICAS::FISIOLOGIA

Monocytes and macrophages represent keys components of the immune response. Based on the expression of LPS co-receptor CD14 and CD16 expression, FCγ III receptor, monocytes are classified into 3 subtypes: classical monocytes, which are CD14hiCD16-; intermediate monocytes, which are CD14hiD16+; and non-classical monocytes, CD14lowCD16+. AD is a chronic inflammatory cutaneous disease, with multifactorial etiology. Our group performed comparative analysis of monocytes subtypes through the study of the frequency and medium fluorescence intensity of surface molecules (HLADR, CCR5, CD80, CD86, PD1L) and cytokine (IL-6, TNF, IL10) in adults and children by using flow cytometry. The study was performed in two stages. First we compared the subtypes of monocytes from healthy adults and children, and then between healthy children and children with atopic dermatitis (AD). The role of monocyte activation and modulation of the inflammatory process is the subject of our investigation. The results of this study showed that: (1) the relative frequency of monocytes subtypes was similar in adults, healthy children and children with AD, with a predominance of classical monocytes; (2) Classical, intermediate and nonclassical monocytes of children with AD have higher HLA-DR expression when compared to those of healthy children, and monocytes of healthy children have higher expression than healthy adults; (3) adults, healthy children and DA children have higher frequency and expression of CCR5 in intermediate and nonclassical that in classical monocytes; (4) the frequency and expression of CD80 was higher in intermediate and nonclassical monocytes both in children and healthy adults and CD86 expression was more pronounced in intermediate monocytes, in these two groups, beyond wich the expression of CD80 and CD86 molecules on classical monocytes of children with AD was higher than in healthy children; (5) PD1L frequency in monocytes subtypes was similar in adults and children, however, there is a higher expression of this molecule in children classical monocytes when compared to healthy adults classical monocytes. In addition, atopic children have higher expression of this molecule on classical monocytes than healthy children; (6) intermediate and nonclassical monocytes of healthy adults and children have greater inflammatory activity than classical monocytes when evaluating the frequency and expression of IL-6 and TNF-α, contrary to what is observed in children with AD who have greater frequency and expression of IL-6 and TNF-α in classical monocytes compared to healthy children; (7) intermediate and nonclassical monocytes have increased IL10 production than classical monocytes in healthy adults and children. Thus, our results revealed that the relative monocytes frequency is constant in the three studied population groups, but the frequency and expression of surface molecules and cytokines presented significant peculiarities. Summarizing, healthy children have greater expression of HLA-DR molecule than healthy adults, and atopic children have greater expression than healthy children. Monocytes subtypes more involved inflammatory response in healthy adults and children are intermediate and nonclassical monocytes, while classical monocytes in atopic children are more involved in inflammatory response than the same subtype in healthy children. These findings revealed changes in the innate immunity of children with atopic dermatitis extremely important for understanding the pathophysiology of disease.