INTERLEUKIN 10 MITIGATES THE DEVELOPMENT OF THE ZYMOSAN-INDUCED MULTIPLE ORGAN DYSFUNCTION SYNDROME IN MICE

We investigated the effect of interleukin 10 on the development of zymosan-induced multiple organ dysfunction syndrome (MODS) and on plasma concentrations and production capacity of tumour necrosis factor (TNF)-α by peritoneal cells. Groups of C57BL/6 mice received a single intraperitoneal injection with zymosan, a cell wall component ofSaccharomyces cerevisiae, at day 0. Daily doses of human recombinant interleukin 10 (IL-10: 10 or 50μg/kg) were given intraperitoneally either starting directly before administration of zymosan (day 0), or 5 or 8 days after administration of zymosan. The animals were monitored for survival, condition, body weight and temperature. On day 12 all surviving animals were killed to obtain plasma, organs and peritoneal cells. Plasma concentrations of TNF-α and lipopolysaccharide-stimulated production of TNF-α by peritoneal cells were measured; organ weights were registered as an indicator for organ damage. IL-10 improves survival and clinical condition and also reduces organ damage, but only at the highest dose used and only when started simultaneously with the administration of zymosan. Circulating TNF-α concentrations 12 days after zymosan are not affected by any of the IL-10 schedules used. However, lipopolysaccharide-stimulated production of TNF-α by peritoneal cells is increased, in a dose- and time-dependent fashion. The anti-inflammatory cytokine IL-10 is able to attenuate the development of MODS in this model, but only when given simultaneously with zymosan, and in high dosages.