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Differential expression of natural killer cell receptors (CD94/NKG2A) on T cells by the stimulation of G-CSF-mobilized peripheral blood mononuclear cells with anti-CD3 monoclonal antibody and cytokines: a study in stem cell donors.
Transplantation Proceedings 2004 October
We investigated the expression of the inhibitory NKR (CD94/NKG2A) of the G-CSF mobilized peripheral blood mononuclear cells (G-PBMC) on T cells after stimulation for 7 days by immobilized anti-CD3 monoclonal antibody (mAb) with or without cytokines. We demonstrated increased expression of CD94/NKG2A on CD3+/CD8+ T cells. Also, addition of IL-12 induced significantly more CD94/NKG2A expression than addition of IL-15: CD94+CD3+/NKG2A+CD3+; 43.8 +/- 11.6%/33.7 +/- 11.4% by IL-12 versus 32.8 +/- 13.2%/21.3 +/- 9.6% by IL-15, respectively (n = 9, P < .05). However, >90% purified CD94+ cells CD94+ obtained from IL-15-treated G-PBMC by magnetic cell sorting (MACS) exhibited higher cytolytic (CTL) activity against K562 cells than that from IL-12-treated G-PBMC: E:T = 20:1, 40.7 +/- 18.4% vs 15.1 +/- 5.2% (n = 5, P < .05). Therefore, the cytokine effects on inhibitory NKR expression on T cells and CTL activity are differently regulated. Based on these findings, it may be possible to establish the effective strategy to expand inhibitory NKR-expressing T cells with CTL activity for cell therapy.
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