Abstract
After simultaneous stimulation with anti-CD3 monoclonal antibody (mAb) at 10 ng/ml, anti-CD28 mAb at 125 ng/ml, and interleukin-2 (IL-2) at 20 U/ml, peripheral blood mononuclear cells (PBMC) were partially resistant to immunosuppression by transforming growth factor-β (TGFβ2). The doses of TGFβ2 that inhibit cytotoxicity of IL-2 stimulated cells by 60%–70% were much less effective when the same cells were stimulated with anti-CD3/anti-CD28/IL-2. This favorable stimulation generated a cell population characterized by high lytic activity, excellent expansion, and a greater resistance to immunosuppressive action of TGFβ2. The secretion of secondary cytokines important for LAK generation is considered a crucial event, at least partially responsible for the antagonization of TGFβ immunosuppression.
Key words: CD28 lymphocyte stimulation, TGFβ
Abbreviations
- CTL
cytotoxic T lymphocyte
- LAK
lymphokine-activated killer cell
- mAb
monoclonal antibotly
- PBMC
peripheral blood mononuclear cell
- NK
matural killer
- LU
lytic unit
- IL-2
interleukin-2
- IL-2R
interleukin-2 receptor
- TNF
tumor necrosis factor
- TGF
transforming growth factor
- IFN
interferon
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