Abstract
Murine spleen cells were activated with concanavalin A (Con A), pokeweed mitogen (PWM), or phorbol myristate acetate (PMA) and the calcium ionophore A23187. Cells producing gamma interferon (IFN-gamma) or interleukin 4 (IL-4) could be detected by lymphokine-specific monoclonal antibodies and indirect immunofluorescence. The frequency and kinetics of the lymphokine-producing cells were examined and were approximately the same after stimulation with Con A or PMA and A23187. Thirty hours after activation, 3-9% of the cells produced IFN-gamma. There were few IL-4-producing cells, and the maximal frequency was 1 out of 400 spleen cells 48 h after activation. When the cells were activated with PWM, the frequency of IFN-gamma-producing cells was still high 72 h after culture. The majority of the IFN-gamma-producing cells were CD8+ and expressed receptors for IL-2.
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