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Aberrant interleukin (IL)‐4 and IL‐5 production in vitro by CD4+ helper T cells from atopic subjects

The cytokine secretion profiles of T cell lines (TCL) specific for purified proteinderivative (PPD) or streptokinase (SK), contemporarily derived from nine atopic and nine nonatopic individuals, were compared. Upon stimulation with phorbol myristate acetate(PMA) plus anti‐CD3 monoclonal antibody (mAb), all TCL from both atopics and nonatopics produced interleukin (IL)‐2 and interferon (IFN)‐γ. The mean IL‐2 production by PPD‐ or SK‐specific TCL from both atopics andnonatopics was similar, whereas the mean IFN‐γ production by TCL derived from atopics was significantly lower. In addition, both PPD‐ and SK‐specific TCL from atopics produced detectable amounts of IL‐4 and IL‐5, whereasthe corresponding TCL derived from nonatopics did not.