Kinetics of Serum Cytokine Profile in Mice after Injection of Supernatants of Group A Streptococci Culture

Dose-Dependent Effect of Bacillus sp. Metabolites from Permafrost on Lymphocyte Differentiation in the Thymus

We studied the effect of a single intraperitoneal injection of metabolites from Bacillus sp. M3 strain isolated from permafrost (from 5×10³ to 50×10³ microbial bodies) on differentiation of T cells in the thymus of F1(CBA/Black-6) mice. On day 21 after the injection of metabolites, a dose-dependent decrease in the level of CD34+CD44+ and an increase in the number of CD34⁺CD44-, CD25-TCR⁺, CD25⁺TCR^+max, CD4⁺CD8-, CD4-CD8⁺, and CD44⁺TCR⁺ lymphocytes were observed in the thymus. The increase in thymus level of mature (CD25⁺TCR^+max) and migration-ready (CD44⁺TCR⁺) T cells in combination with a moderate decrease in the level of T cell precursors entering the thymus from the bone marrow (CD34⁺CD44⁺) can indicate a modulating influence of Bacillus sp. metabolites on functional activity of the thymus aimed at maintenance of the T cell balance in the body.