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Similarities of Fcγ Receptors on Trophoblasts and Placental Endothelial Cells
Author(s) -
MATRE R.
Publication year - 1977
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1111/j.1365-3083.1977.tb00416.x
Subject(s) - receptor , antibody , antiserum , immunoglobulin g , fc receptor , microbiology and biotechnology , chemistry , guinea pig , subclass , endothelium , biology , biochemistry , immunology , endocrinology
The trophoblastic tissue and endothelium of fetal stem vessels in cryostat sections of first‐trimester and term human placentae adsorbed erythrocytes sensitized with IgG antibodies of human, rabbit, and guinea pig origin. Native and heat‐aggregated human and rabbit IgG, and human IgG subclasses except IgG2 inhibited the hemadsorption. However, the Fc fragment of IgG2 inhibited the hemadsorption similarly to the Fc of pooled IgG. No inhibition was obtained with o'ther immunoglobulin classes or fragments. The inhibitory activity of IgG and Fc fragments was abolished by partial reduction and alkylation, indicating that inter‐heavy‐chain disulfide bonds are required for the binding. Immune complexes prepared at slight antigen excess showed an eightfold stronger inhibition than antiserum alone. Both receptors were sensitive to formaldehyde, periodic acid, and heat. The Fcγ receptors on the trophoblasts and on the endothelium in human placentae are apparently similar.