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Sodium Selenite Diminished the Regulatory T Cell Differentiation In Vitro

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Abstract

Sodium selenite modulates the activity of lymphocytes. It negatively regulates the suppressive activity of cells and increases the immune response. In this study, we evaluated whether the regulatory T cell differentiation was modulated by sodium selenite. The percentages of CD4+CD25+Foxp3+, CD4+CD25+, and CD4+CTLA-4+ cells in CD4+ T cells cultures stimulated with IL-2 and TGF-β in the presence or absence of selenium, in the form of sodium selenite (2.0×10−6M), were evaluated by flow cytometry. The mRNA expression of TET2/3 enzymes and IL-10 was analyzed by RT-qPCR and the levels of IL-10 were measured by an ELISA. We observed a decrease in CD4+CD25+Foxp3+ and CD4+CTLA-4+ cells in presence of selenium. However, normal percentages were reached again after selenium removal. An increase in CD4+CTL4-4+ cells was detected in selenium-primed cell cultures in absence of IL-2 and TGF-β. In addition, we observed a decrease in TET3 in presence of selenium. Finally, we observed an augment in IL-10 transcription and protein levels and relative expression of TET2 in cultures exposed to selenium. We suggest that selenium reversibly affects the regulatory T cell differentiation in vitro. Likewise, selenium may modulate Treg percentages promoting optimal immune responses and, at the same time, the expression of specific suppressor molecules.

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Acknowledgements

Perez Ruiz-Esparza Julian for his technical assistance

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Contributions

All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by Mendez-Frausto G and Uresti-Rivera EE. The first draft of the manuscript was written by Garcia-Hernandez MH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript

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Correspondence to M. H. García-Hernández.

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Conflict of Interest

Author Mendez-Frausto G received a research grant from Company CONACYT (scholarship number: 461538). She declares that she has no conflict of interest. In addition, all authors depicted in this study declare that they have no conflict of interest.

Ethical Approval

All procedures performed in the study were in accordance with the ethical standards of the bioethical committee of the National Commission for Scientific Research of IMSS (project R-2018-785-072) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Supplementary Fig. 1

Flow cytometry analyses. a) The percentage of viable, early apoptotic, late apoptotic, and necrotic cells are shown. The cells were incubated in presence of sodium selenite concentrations without stimulation for 24 hours, according to depicted in the material and methods section. Dead cell apoptosis was measured through Annexin-V and PI staining by flow cytometry. Data are presented as mean ± SEM. A two-way ANOVA test was used for statistical analysis. *P<0.05 was considered significant. Horizontal lines show statistically significant differences between the indicated groups. b) Representative dot plot of the purity of CD4+ T cells after isolation, as shown in the Material and Methods section. c) Representative dot plot showed the gating strategy for CD4+CD25+Foxp3+ cells evaluation after Treg differentiation. Fluorescence minus one (FMO) control is shown. First, CD4 + cells were observed in the absence of the CD25 marker, then a gate location was defined to determine CD4 + CD25 + cells. Finally, to determine CD4+CD25+Foxp3+ cells, CD4 + CD25 + cells were in the absence of a Foxp3 marker to delimit a gate location. (PNG 310 kb)

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Uresti-Rivera, E.E., Méndez-Frausto, G., Medina-Rosales, M.N. et al. Sodium Selenite Diminished the Regulatory T Cell Differentiation In Vitro. Biol Trace Elem Res 201, 1559–1566 (2023). https://doi.org/10.1007/s12011-022-03263-x

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