Use of sodium polyprenylphosphate to correct changes in the immune response caused by Helicobacter pylori CagA proteins in the experiment

Helicobacter pylori (HP) bacteria have a wide range of pathogenicity factors. The HP genome contains genes of the CagA group (cytotoxin-associated genes). Infection with CagA-positive HP strains is associated with the production of pro-inflammatory cytokines, which are involved in the maintenance and development of destructive and inflammatory changes in the organism. Here we studied the role of CagA proteins in the regulation of the immune response in DBA mice and evaluated the corrective effect of polyprenyl phosphate (PP) on this process. Genetically modified strains of E. coli were used, differing by the presence of an island of genes encoding the synthesis of HP CagA proteins. The drug Phosprenyl was used as a source of PP. The subpopulation composition of spleen cells was evaluated by flow cytofluorimetry using monoclonal antibodies. The level of IL 10, TGF-β in blood serum was determined by the enzyme immunoassay. The proliferative activity of splenocytes was measured by the standard procedure based on the inclusion of³H-thymidine in the DNA. CagA HP proteins caused the polarization of the immune response by the Th1-dominant type, which was expressed by an increase in the population of CD4⁺cells, CD25⁺ and CD25⁺ Foxp3⁺ T cells and increase proliferation T- limphocytes. Inoculation of CagA + bacteria was accompanied by a quantitative increase in TGF-β produced by activated Treg cells. PP inoculation led to the normalization of the CD4 and CD8 T cells, a decrease in the populations of CD25⁺, Foxp3⁺, CD25⁺ Foxp3⁺ cells, and further increase in the IL-10 levels. Thus, PP corrected cellular immune response, prevented the pronounced polarization of the Th1 immune response, and reduced the activation of Treg population. The results obtained indicate a possible decrease in the pro-inflammatory immune response under the influence of PP.

Helicobacter pylori, CagА proteins, sodium polyprenyl phosphate, immune response, regulatory T cells, cytokines, mice

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