Abstract
Immunomodulatory properties of S. pyogenes protein M111 were studied on the model of Gurov strain and its isogenic mutant not expressing M protein. Mouse resident peritoneal macrophages were incubated with bacteria and generation of nitroxide and superoxide anions and production of IL-6, IL-10, and IL-17 were evaluated. Protein M111 modified macrophage response: it exhibited antiphagocytic activity, prevented ROS formation, and stimulated the production of anti-inflammatory cytokine IL-10. The results suggested that this protein could serve in the bacteria as a factor suppressing the host defense forces and promoting the realization of the strategy beneficial for pathogens - escape from the host immune defense.
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