Análise fenotípica de células dendríticas e de linfócitos T efetores, polifuncionais e reguladores no líquen plano / Phenotypic analysis of dendritic cells and effector, polyfunctional and regulators lymphocytes on lichen planus

Líquen plano (LP) é uma doença mucocutânea de natureza inflamatória crônica de etiologia ainda desconhecida. A estimulação da imunidade inata via os receptores Toll-like (TLRs) podem influenciar as células dendríticas e direcionar a resposta de células T CD4+ e CD8+ efetoras, assim como também favorecer o estado inflamatório do LP. OBJETIVOS: Avaliar o perfil fenotípico de células dendríticas mielóides (mDCs) e plasmocitóides (pDCs) e de linfócitos T CD4+ e CD8+ após estímulo com agonistas de TLRs no sangue periférico de pacientes com LP. Além disto, avaliar a frequência, perfil de maturação e os subtipos de células T CD4+ e TCD8+ reguladores. MÉTODOS: Foram selecionados 18 pacientes com LP (15 mulheres, 3 homens), com 41,57 ± 4,73 anos de idade e um grupo controle com 22 indivíduos sadios (18 mulheres, 4 homens), com 43,92 ± 7,83 anos de idade. As células mononucleares (CMNs) de sangue periférico foram avaliadas por citometria de fluxo quanto à: 1) Produção de TNF-? em mDCs e de IFN-? em pDCs em CMNs ativadas por agonistas de TLR 4, 7, 7/8 e 9; 2) Análise de células T CD4+ e CD8+ monofuncionais e polifuncionais após estímulo com agonistas de TLR 4, 7/8, 9 e enterotoxina B de Staphylococcus aureus (SEB); 3) Avaliação de células Th17 e Th22/Tc22 em CMNs após estímulo com SEB; 4) Frequência, perfil de maturação e subtipos de células T CD4+ e CD8+ reguladoras. RESULTADOS: 1) Nos pacientes com LP foi demonstrado um aumento na frequência de mDCs TNF-alfa+ após estímulo com agonistas de TLR4/LPS e TLR7-8/CL097, mas com imiquimode/TLR7 houve diminuição da expressão de CD83. Já nas pDCs do grupo LP, o imiquimode foi capaz de diminuir a expressão de CD80 e o CpG/TLR9 diminuiu a expressão de CD83 no LP. 2) As células T CD4+ secretoras de IL-10 mostraram aumento da frequência nos níveis basais, que diminuiu após estímulo com LPS e SEB. Em contraste, a produção de IFN-y aumentou em resposta ao LPS enquanto diminuiu para CpG. As células...

Lichen planus (LP) is a mucocutaneous disease of chronic inflammatory course of unknown etiology. Stimulation of the innate immune system via Toll-like receptors (TLRs) may influence the dendritic cells and targeting the CD4+ and effector CD8+ T cell responses, as well as promoting inflammatory status of the LP. OBJECTIVES: To evaluate the phenotypic profile of myeloid dendritic cells (mDCs), plasmacytoid (pDCs) and CD4+ and CD8+ T lymphocytes after stimulation with TLR agonists in peripheral blood of patients with LP. Moreover, to evaluate the frequency, maturation profile and subtypes of CD4+ and CD8+ T regulators cells. METHODS: We selected 18 patients with LP (15 women, 3 men) with 41.57 ± 4.73 years old and a control group of 22 healthy subjects (18 women, 4 men), with 43.92 ± 7, 83 years old. Mononuclear cells from peripheral blood (PBMCs) were assessed by flow cytometry for: 1) mDC TNF-alfa production and pDCs IFN-alfa production in PBMCs activated by agonists of TLR 4, 7, 7/8 and 9; 2) Analysis of monofunctional and polyfunctional CD4+ and CD8+ T cells after stimulation with TLR 4 agonists, 7/8, 9 and Staphylococcus aureus enterotoxin B (SEB); 3) Evaluation of Th17 and Th22/ Tc22 cells in PBMCs after stimulation with SEB; 4) Frequency, maturation profile and subtypes of regulatory CD4+ and CD8+ T cells. RESULTS: 1) Patients with LP showed an increased frequency of TNF-alfa+ mDCs after stimulation with agonists of TLR4/LPS and TLR7-8 /CL097, whereas with imiquimod /TLR7 induced a decreased CD83 expression. Already in the pDCs of LP group the imiquimod was able to decrease the CD80 expression and CpG/TLR9 decreased CD83 expression. 2) CD4+ T cells secreting IL-10 demonstrated an increased frequency at the baseline levels, which decreased after stimulation with LPS and SEB. In contrast, the production of IFN-y increased in response to LPS while decreased to CpG. Polyfunctional CD4+ T cells secreting simultaneously 5...

Endocytosis of Ca Alginate Nanocapsules by Dendritic Cells and Function Induction / 中国生物工程杂志

The endocytosis/phagocytosis of calcium alginate nanocapsules by peripheral blood derived dendritic cells was confirmed with the use of Quantum dots labeling.Results further demonstrated these nanoparticles could cause the upregulation of HLA-DR expression to induce the maturation of dendritic cells in vitro.Dendritic cells stimulated by nanocapsules covalently loaded with BSA were shown to stimulate the proliferation of self T cells with blank capsules and free BSA as controls,suggesting their potential applications in cancer cell therapy as a new antigen delivery vehicle with a strong adjuvant effect.