Abstract
Background
Decidual γδ T cells are known to regulate the function of trophoblasts at the maternal—fetal interface; however, little is known about the molecular mechanisms of cross talk between trophoblast cells and decidual γδ T cells.
Methods
Expression of chemokine C-X-C motif ligand 6 (CXCL16) and its receptor CXCR6 was evaluated in first-trimester human villus and decidual tissues by immunohistochemistry. γδ T cells were isolated from first-trimester human deciduae and cocultured with JEG3 trophoblast cells. Cell proliferation and apoptosis-related molecules, together with cytotoxicity factor and cytokine production, were measured by flow cytometry analysis.
Results
Expression of CXCL16 and CXCR6 was reduced at the maternal—fetal interface in patients who experienced unexplained recurrent spontaneous abortion as compared to healthy pregnancy women. With the administration of pregnancy-related hormones or coculture with JEG3 cells, CXCR6 expression was upregulated on decidual γδ T cells. CXCL16 derived from JEG3 cells caused a decrease in granzyme B production of decidual γδ T cells. In addition, decidual γδ T cells educated by JEG3-derived CXCL16 upregulated the expression of Bcl-xL in JEG3 cells.
Conclusion
This study suggested that the CXCL16/CXCR6 axis may contribute to maintaining normal pregnancy by reducing the secretion of cytotoxic factor granzyme B of decidual γδ T cells and promoting the expression of antiapoptotic marker Bcl-xL of trophoblasts.
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Deng-Xuan Fan and Wen-Jie Zhou contributed equally to this work.
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Fan, DX., Zhou, WJ., Jin, LP. et al. Trophoblast-Derived CXCL16 Decreased Granzyme B Production of Decidual γδ T Cells and Promoted Bcl-xL Expression of Trophoblasts. Reprod. Sci. 26, 532–542 (2019). https://doi.org/10.1177/1933719118777638
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DOI: https://doi.org/10.1177/1933719118777638