The kinetics of interleukin (IL-2) release from mouse spleen cells incubated with different doses of outer membrane proteins (OMP) from Shigella was investigated. OMP induced very low activity of IL-2 after 2 and 4 h, and only a slightly higher level of the cytokine was detected after 6 h. However, IL-2 activity increased markedly after 20 and 24 h of incubation, and doses of 5 and 10 micrograms of OMP were found to be the most effective. Spleen cells cultured with OMP for 48 h contained reduced concentration of IL-2.
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