IMMUNOGENIC PROPERTIES OF CELLULAR AND EXTRACELLULAR PROTEIN-CONTAINING ANTIGENS OF STAPHYLOCOCCUS AUREUS

Abstract

Aim. Comparative study of immunobiological properties of cell wall surface antigens and extracellular protein-containing antigens of Staphylococcus aureus. Materials and methods. Preparations: surface antigens of the cell wall (peptidoglycan, teichoic acids, protein antigens) of the strains of S. aureus containing in the staphylococcal vaccine «Staphylovac» (SV) and extracellular protein-containing antigens of S. aureus (EPCA). The parameters of innate immunity were evaluated by the effect of preparations on the immunophenotype of mononuclear leukocytes (ML) of the spleen of mice, expression of Toll-like receptors (using flow cytometry), phagocytic activity of macrophages of peritoneal exudate of mice after the introduction of SV and EPCA; the protective activity of preparations was studied in experiments of active protection of BALB/c mice. Results. To isolate EPCA, we used the virulent strain of S. aureus №6, and for obtaining surface antigens of the cell wall, 4 strains were selected, the most immunogenic of which was the low virulent strain of S. aureus №1991. Both preparations increased the number of TLR2 and MHC II expressing cells; CV administration caused an increase in the number of cells with CD25 marker, reflecting the early activation of immunocompetent cells, and EPCA immunization — led to a shorter expression of this marker. On the other hand, an increased number of CD19 positive cells were detected for a longer period of time during EPCA immunization. The longest activation of phagocytosis under the action of SV was established. High protective activity of bo-th types of the studied preparations was noted. Conclusion. The antigens of the cell wall and extracellular protein-containing experimental drugs possessed comparable immunological properties, however, the surface antigens to a greater extent activate innate immunity, and extracellular — adaptive immunity.

Keywords

• staphylococcal vaccine
• «staphylovac»
• extracellular experimental protein containing preparations — ebsp
• effectors of innate and adaptive immunity