Abstract
Toxic shock syndrome toxin-1 (TSST-1), isolated from Staphylococcus aureus strains associated with toxic shock syndrome (TSS), is known as a potent mitogen and interleukin-1 inducer. The potential of TSST-1 as an interleukin-2 (IL-2) inducer was tested on human peripheral blood lymphocytes (HPBL) and murine spleen lymphocytes (MSL). These cells were incubated with TSST-1 and the supernatants analysed for IL-2 production. Preincubation of IL-2-dependent indicator cells (IC) with a monoclonal antibody specific for murine IL-2 receptors inhibited their proliferation by supernatants of TSST-1-treated MSL, thus strongly suggesting that they contain IL-2. The concentrations of TSST-1 required for HPBL or MSL to produce IL-2 ranged between 10(-1) and 10(-4) micrograms/ml. The amount of IL-2 units/ml varied little from one experiment to another. In contrast, IL-2 production by PHA-stimulated HPBL or Con A-stimulated MSL showed great variability and dependence on mitogen concentration. T-cell depleted MSL exposed to TSST-1 produced less IL-2. Experiments with germ-free mice and TSST-1-primed mice demonstrated that IL-2 production is not related to TSST-1 antigenicity.
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