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Ketotifen inhibits allergen-specific T lymphocytes' responses by suppressing antigen presentation with concomitant decrease of HLA-DQ antigen on macrophages.
Asian Pac J Allergy Immunol ; 1996 Dec; 14(2): 69-79
Artigo em Inglês | IMSEAR | ID: sea-36949
ABSTRACT
Allergen activates T lymphocytes responsive to interleukin 2 (IL-2) in allergic patients but not in normal individuals. This response was suppressed by anti-allergic agent, Ketotifen (4-(1-methyl-4-piperidylidene)-4H-benzo [4, 5] cyclohepta [1, 2-b] thiophen-10 (9H)-one hydrogen (fumarate). Prolonged culture of antigen-presenting adherent cells impaired the ability to present Dermatophagoides farinae (Df) antigen to T cells, whereas stimulation of adherent cells with recombinant interferon-gamma (IFN-gamma) restored the antigen-presenting capability. The maintained antigen presenting ability of adherent cells treated with IFN-gamma was also suppressed by Ketotifen. Fluorescence activated cell sorter (FACS) analysis disclosed that Ketotifen selectively reduced the expression of HLA-DQ antigen, crucial restriction elements in Df antigen-related responses, on macrophages but not on B cells, even in the presence of IFN-gamma. Collectively, Ketotifen prevented macrophages from inducing allergen-activated T lymphocytes' responsiveness to IL-2 at least in part by decreasing the expression of HLA-DQ antigen.
Assuntos
Texto completo: DisponíveL Índice: IMSEAR (Sudeste Asiático) Assunto principal: Asma / Humanos / Linfócitos T / Antígenos HLA-DQ / Adesão Celular / Células Cultivadas / Criança / Pré-Escolar / Adolescente / Interleucina-4 Idioma: Inglês Revista: Asian Pac J Allergy Immunol Ano de publicação: 1996 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: IMSEAR (Sudeste Asiático) Assunto principal: Asma / Humanos / Linfócitos T / Antígenos HLA-DQ / Adesão Celular / Células Cultivadas / Criança / Pré-Escolar / Adolescente / Interleucina-4 Idioma: Inglês Revista: Asian Pac J Allergy Immunol Ano de publicação: 1996 Tipo de documento: Artigo