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Chemokine (C‐C motif) ligand 25 expressed by trophoblast cells and leukocytes bearing its receptor Ccr9: An alliance during embryo implantation?
Author(s) -
Weingrill Rodrigo Barbano,
Hoshida Mara S.,
Martinhago Ciro Dresch,
CorreaSilva Simone,
Cardoso Elaine,
Palmeira Patrícia,
Marinho Claudio Romero Farias,
Bevilacqua Estela
Publication year - 2018
Publication title -
american journal of reproductive immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.071
H-Index - 97
eISSN - 1600-0897
pISSN - 1046-7408
DOI - 10.1111/aji.12783
Subject(s) - trophoblast , microbiology and biotechnology , embryo , receptor , chemokine , chemistry , c c chemokine receptor type 6 , chemokine receptor , ligand (biochemistry) , biology , genetics , pregnancy , biochemistry , placenta , fetus
Problem We hypothesized that trophoblast expression of Ccl25 attracts a specific leukocyte cell population to the implantation site for local regulation. Method of study Mice blastocysts, ectoplacental cones, and decidua at gestational days 3.5‐7.5 were evaluated for Ccl25 and Ccr9 expressions. Peripheral availability and characterization of Ccr9+ leukocytes were determined by flow cytometry. Leukocyte chemotaxis was assessed in the presence of Ccl25 recombinant protein and embryos using antisense oligomers (ODNs) to Ccl25 and Ccr9 neutralizing antibody. Results Ccl25 was expressed by embryonic cells, whereas Ccr9 expression was strong at the maternal compartment and in PBMC. Immunolocalization confirmed this expression. In vitro, chemotaxis assays showed that the embryonic Ccl25 signals to Ccr9+ PBMCs. Maternal Ccr9+α4β7+ monocytes switch from an anti‐inflammatory phenotype (F4/80+11b+Ly6C‐TGF‐β+ cells, pre‐implantation) to an inflammatory profile (F4/80+11b+Ly6C+TNF‐α+ cells, post‐implantation). Conclusion Our data support the establishment of a CCL25/CCR9‐axis at the maternal‐fetal interface in mice, which may be involved in immune regulatory mechanisms during embryo implantation.