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HLA-restricted and Antigen-specific CD8+ T Cell Responses by K562 Cells Expressing HLA-A*0201
Immune Network ; : 179-184, 2006.
Artigo em Inglês | WPRIM | ID: wpr-91160
ABSTRACT

BACKGROUND:

Identification of antigen-specific T cells has yielded valuable information on pathologic process and the disease state. Assays for quantification of inflammatory cytokines or lytic-granule molecules have been generally used to evaluate antigen specific T cell response, however their applicability have been hampered due to the limited source of autologous antigen-presenting target cells (APC).

METHODS:

K562, a leukemic cell line deficient of human leukocyte antigen (HLA), was transfected with a gene encoding HLA-A*02 (K562/A*02) and its function as stimulator cells in inducing activation of HLA-matched T cells was evaluated by IFN-gamma enzyme linked immunospot (ELISPOT) assay.

RESULTS:

The stable transfectant K562/A*02 pulsed with HLA- A*02 restricted peptide could specifically induce IFN-gamma secretion by CD8+ T cells compared to no detectable secretion by CD4+ T cells. However, CD56+ NK cells secreted IFN-gamma in both K562/A*02 with peptide and without peptide. The number of IFN-gamma secreted CD8+ T cells was increased according to the ratio of T cells to K562 and peptide concentration. Formalin-fixed K562/A*02 showed similar antigen presenting function to live K562/A*02. Moreover, K562/A*02 could present antigenic- peptide to not only A*0201 restricted CD8+ T cells but also CD8+ T cells from A*0206 donor.

CONCLUSION:

These results suggest that K562/A*02 could be generally used as target having specificity and negligible background for measuring CD8+ T cell responses and selective use of K562 with responsder matched HLA molecules on its surface as APC may circumvent the limitation of providing HLA-matched autologous target cells.
Assuntos

Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Peptídeos / Doadores de Tecidos / Células Matadoras Naturais / Linfócitos T / Linhagem Celular / Citocinas / Genes vif / Sensibilidade e Especificidade / Células K562 / Leucócitos Tipo de estudo: Estudo diagnóstico Limite: Humanos Idioma: Inglês Revista: Immune Network Ano de publicação: 2006 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Peptídeos / Doadores de Tecidos / Células Matadoras Naturais / Linfócitos T / Linhagem Celular / Citocinas / Genes vif / Sensibilidade e Especificidade / Células K562 / Leucócitos Tipo de estudo: Estudo diagnóstico Limite: Humanos Idioma: Inglês Revista: Immune Network Ano de publicação: 2006 Tipo de documento: Artigo