Problem: Interleukin 35 (IL-35) is involved in the pathogenesis of endometriosis by suppressing immunoreaction and promoting endometrial cell proliferation. It may also be an essential cytokine in forming the immunosuppressive functions of regulatory B lymphocytes (Bregs). The involvement of Bregs in the pathogenesis of endometriosis has not been previously investigated. In this study, we determined the frequencies of different Breg subpopulations, namely, B10, immature B-cells, and plasmablasts, and their abilities to produce IL-35 in women with endometriosis compared to healthy women.
Methods: The frequencies of different subpopulations of Bregs producing IL-35 were measured in the peripheral blood of women with endometriosis (total pool), women with deep infiltration endometriosis (DIE), women with ovarian endometriosis, and healthy women as a control by flow cytometry.
Results: We observed a decrease in the percentage of B10 cells and plasmablasts in women with endometriosis and an increase in the percentage of these Breg populations producing IL-35 in the same experimental group. Interestingly, we also revealed that women with DIE had increased percentages of B10 cells and plasmablasts producing IL-35.
Conclusion: Taken together, our findings are the first to reveal the frequencies of different subpopulations of Bregs producing IL-35 in women with endometriosis. The results suggest that IL-35 expression in B lymphocytes could be used as a peripheral marker of endometriosis; however, further studies are needed.
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