IN VIVO STUDY OF POTENTIAL MECHANISMS OF MACROPHAGE REPOLARIZATION ON THE BACKGROUND OF TUMOR GROWTH
DOI:
https://doi.org/10.15407/exp-oncology.2024.01.030Keywords:
peritoneal macrophages, M1/M2 polarization, natural killer cells, cytotoxic lymphocytes, transcription factors, Ehrlich adenocarcinomaAbstract
Aim. To study the activity of antitumor immunity effectors and to analyze possible mechanisms of peritoneal Mph M1/M2 repolarization of Balb/c mice under the influence of lectin from B. subtilis IMV B-7724 in the dynamics of the model tumor growth. Materials and Methods. Studies were performed on Balb/c mice; Ehrlich adenocarcinoma (АСЕ) was used as an experimental tumor. Lectin from B. subtilis IMV B-7724 was administered to ACE-bearing mice at a dose of 1 mg/kg of body weight, 10 times. Immunological testing was performed on days 21 and 28 after tumor grafting. The functional activity of peritoneal macrophages (Mph), natural killer (NK) cells, cytotoxic lymphocytes (CTL), and cytokine levels (IFN-γ, IL-4) were studied by the standard methods. mRNA expression levels of transcription factors STAT-1, STAT-6, IRF5, and IRF4 in Mph were evaluated. Results. The administration of lectin from B. subtilis IMV B-7724 to mice with solid ACE led to the preservation of the initial functional state of peritoneal Mph M1 during the experiment. The bacterial lectin ensured the preservation of the cytotoxic activity of CD8+ T-lymphocytes and a significant (p < 0.05) increase in the NK activity (by 2.7 times compared to the intact animals and by 12.9 times compared to the untreated mice). A strong positive correlation was noted between the levels of the functional activity of Mph and CD8+ T-lymphocytes of animals with tumors and the indices of the antitumor effectiveness of bacterial lectin. The indirect polarization of Mph was evidenced by a strong positive correlation between the level of the NO/Arg ratio (which characterizes the direction of Mph polarization) and the cytotoxic activity of CD8+ T-lymphocytes, NK cells, and the expression of STAT1/STAT6 (the 21st day) and IRF5/IRF4 (the 28th day). Conclusion. In ACE-bearing mice, repolarization of the peritoneal Mph toward M1 can occur not only due to the direct action of bacterial lectin on the cellular receptors but also with the involvement of other effectors of antitumor immunity (NK cells, T-lymphocytes). The transcription factors of the STAT and IRF signaling pathways are involved in the polarization process.
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