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Fcγ‐receptor activity in the developing human placenta
Author(s) -
Jensen T. SKEIE,
Matre R.
Publication year - 1995
Publication title -
apmis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.909
H-Index - 88
eISSN - 1600-0463
pISSN - 0903-4641
DOI - 10.1111/j.1699-0463.1995.tb01129.x
Subject(s) - cytotrophoblast , syncytiotrophoblast , trophoblast , placenta , andrology , biology , staining , monoclonal antibody , receptor , podocalyxin , stromal cell , microbiology and biotechnology , fetus , antibody , medicine , chemistry , immunology , endocrinology , pregnancy , biochemistry , cancer research , kidney , proteinuria , podocyte , genetics
The expression of Fey receptors (FcγR) and annexin II in 20 placentae (range 8–27 weeks' gestation) and in 3 full‐term placentae was studied using monoclonal antibodies (mAbs) and soluble immune complexes. Functionally active FcyR was detected on the trophoblast, endothelial cells, and stromal cells (Hofbauer cells) from the 8th week of gestation. FcγRI (mAb 32.2) and FcγRIII (mAb 3G8) were detected only on Hofbauer cells, whereas FcγRII (IV3 and C1KM5) were detected both on Hofbauer cells and endothelial cells. FcγRIII (anti‐Leu‐lib) and the IgG‐binding molecule annexin II (mAb B1D6) were expressed by Hofbauer cells, endothelial cells, and the trophoblast. There was some variation in staining among the different specimens, but the number of positive cells as well as the staining intensity increased from the first to the second trimester. In first trimester placenta, staining was localized both to the syncytio‐ and cytotrophoblast, with the strongest intensity in the cytotrophoblast and at the boundary between the two cell layers. In second and third trimester placenta, staining was localized to the syncytiotrophoblast. The localization and distribution of FcγR on the trophoblast during ontogeny is of interest with regard to its presumed role in the transport of IgG from mother to fetus.