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Production of an early release, M(r) 36,000 monokine by stimulated rat macrophages.

Supernatants from rat peritoneal macrophage cultures stimulated with bacterial products contain a M(r) 36,000 factor that protects immature cortical thymocytes from loss of viability over a 4-hr incubation period in vitro. This effect could not be produced with purified transforming growth factor-beta or recombinant interleukin-6 (IL-6). Further, the partially purified M(r) 36,000 fraction was inactive in bioassays for IL-1 and tumour necrosis factor. Maximal production of the factor occurred 2 hr after the addition of 20 micrograms/ml of lipopolysaccharide, as assessed by the titre resulting in 100% protection of thymocytes in a viability assay. The detection of protective activity within 5 min after addition of the stimulant could be attributed to the release of intracellular stores but protein synthesis was required to account for the increasing titre up to peak levels. The titre fell rapidly after 2 hr so that activity could not be detected at 4 hr. This profile of release was refractory to repeated stimulation with lipopolysaccharide. Conjoint addition of lipopolysaccharide and indomethacin, did, however, allow release in response to subsequent challenge. Related to this finding, prostaglandin E2 completely inhibited the release of protective activity.