Polarized Macrophages As Potential Anti‐Endometrioid agent

Abstract

Endometriosis is an estrogen‐dependent chronic inflammatory disease characterized by the presence of endometrial stroma and glands outside the endometrium. The gold standard in the treatment of endometriosis is laparoscopy but after that, the relapse rate is about 50%. Thus, the search for new effective non‐invasive methods of endometriosis therapy is an actual problem. Endometriosis has many properties similar to tumors including the fact that macrophages with an anti‐inflammatory phenotype (M2) prevail in the foci of endometriosis. It is already known that activated macrophages with a pro‐inflammatory phenotype (M1) have an antitumor effect. In this regard, we hypothesized that increasing the proportion of M1 macrophages could help in the treatment of endometriosis. The objectives of our work were (1) to assess the expression profile of macrophages in the foci of endometriosis in mice model of endometriosis; (2) to test the efficacy of administration of reprogrammed M1 macrophages as a possible anti‐endometrioid agent in the mouse.We studied the phenotypic profile of macrophages in the foci of endometriosis and the anti‐endometrioid activity of M1 macrophages on in vivoallogeneic model of mouse endometriosis induced in ovariectomized mice after intraperitoneal transplantation of the mouse uterus accompanied by 17β‐estradiol therapy. Analysis of the phenotypic profile of macrophages in the foci of endometriosis was carried out using immunohistochemical staining, western blot analysis, and qPCR. We obtained a reproducible model with lesions that had characteristic morphology. It was shown that macrophages with an anti‐inflammatory arginase1+ phenotype prevail in the foci of endometriosis compared with the intact endometrium. After verifying endometriosis development in mice, the experimental group was injected with M1‐polarized macrophages, while the control group was injected with unpolarized macrophages, and then the animals were monitored for two weeks. Macrophage cell line RAW264 was incubated with lipopolysaccharide (100 ng/ml) for 24 h to obtain M1‐polarized macrophages. M1‐polarization was verified by significant up‐regulation of MARCO, iNOS markers using western blot and qPCR analysis. After treatment of animals with M1 macrophages, we found that the number of foci and their sizes significantly decreased (p<0.05) in comparison with control animals.In our work, we proved the predominance of anti‐inflammatory macrophages in the foci of endometriosis and obtained the first results of a positive effect of M1 macrophages on the regression of foci of endometriosis.