The effects of metabolites of Bacillus sp. strain M3 and Bacillus megaterium strain 8/75-1 isolated from permafrost formations, as well as a medicinal Bacillus cereus strain IP5832 on the secretion of TNFα, IL-1β, and IL-10 by mononuclear cells of human peripheral blood depending on the temperature of bacteria culturing (-16oC, -5oC, and 42oC) were studied. Metabolites of 8/75-1 and M3 strains cultured at 42oC produced more potent stimulating effect on TNFα and IL-10 synthesis than metabolites from these bacteria cultured at -16oC and -5oC (p<0.01). Temperature did not affect the ability of metabolites to modulate IL-1β synthesis in all bacterial strains and the ability of IP5832 strain metabolites to modulate TNFα production. IL-10 secretion was minimum under the effect of metabolites of IP5832 strain cultured at 42oC. The TNFα/IL-10 and IL-1β/IL-10 ratios indicated that metabolites of permafrost bacteria cultured at 42oC can shift the balance towards the synthesis of proinflammatory cytokines.
Keywords: IL-1β; and IL-10; cytokines TNFα; metabolites of permafrost microorganisms; mononuclear cells; temperature.