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To assess the potential effect of an orally administered immunomodulator, consisting of a lysate of seven different bacteria, on polymorphonuclear leukocyte (PMN) function, rabbits were fed this preparation for five consecutive days via a gastric tube. On day 6, PMN were separated from peripheral blood and oxidative burst was triggered by opsonized zymosan or 12-O-tetradecanoylphorbol-13-acetate and quantitated on a single-cell basis. This study presents the extension of an existing flow cytometric method, leading to the possibility of quantitating single-cell oxidative burst triggered by particulate (instead of only soluble) stimuli. By this means, treated animals showed statistically significant increased oxidative burst reactions compared with the control group. The data provide evidence that oral application of a bacterial immunomodulator leads to a primed state in PMN for increased oxidative activity in response to a particulate stimulus. This offers the possibility that the beneficial effect of similar treatment in humans may in part be due to comparable mechanisms.

An orally administered bacterial immunomodulator primes rabbit neutrophils for increased oxidative burst in response to opsonized zymosan