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Cytolysis of human dendritic cells by autologous lymphokine‐activated killer cells: participation of both T cells and NK cells in the killing
Author(s) -
Parajuli Prahlad,
Nishioka Yasuhiko,
Nishimura Naoki,
Singh Sukh Mahendra,
Hanibuchi Masaki,
Nokihara Hiroshi,
Yanagawa Hiroaki,
Sone Saburo
Publication year - 1999
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1002/jlb.65.6.764
Subject(s) - lymphokine activated killer cell , cytotoxic t cell , biology , lymphokine , natural killer t cell , cytolysis , interleukin 21 , interleukin 12 , immunology , il 2 receptor , interleukin 2 , immune system , cd8 , dendritic cell , t cell , in vitro , biochemistry
Dendritic cells (DC) play a key role in the initiation of immune response by stimulating the naive T cells. The fate of DC after the initiation of immune response is not clearly understood. Although there are few reports implicating natural killer (NK) cells in the elimination of DC, killing of DC by LAK cells, and specifically by T cells, has not been studied. In this study, we observed that DC, generated from monocytes, in vitro in the presence of granulocyte‐macrophage colony‐stimulating factor, interleukin‐4 (IL‐4), and tumor necrosis factor α were susceptible to cytolysis by lymphokine‐activated killer (LAK) cells induced in the presence of IL‐2 and IL‐15 but not IL‐12 alone. However, LAK cells induced by a combination of IL‐12 and suboptimal dose of IL‐2 were cytotoxic to DC. When purified lymphocytes were activated with IL‐2, the CD8 + /CD57 − fraction (T‐LAK), but not the CD8 − /CD57 + fraction (NK‐LAK) was cytotoxic to autologous DC. However, when unseparated peripheral blood mononuclear cells were used to generate LAK cells, both T‐LAK and NK‐LAK fractions showed equal cytotoxicity against autologous DC. Monoclonal antibodies against CD54, CD11a, and CD18 significantly inhibited the cytolysis, indicating that the killing involves the engagement of CD54 with its ligands. J. Leukoc. Biol. 65: 764–770; 1999.