Expression of Fc gamma binding sites on human extraplacental membranes.

Expression of Fc gamma binding sites on human extraplacental membranes.
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人胎盘外膜上 Fc γ 结合位点的表达。

DOI:
10.1111/j.1600-0897.1983.tb00248.x
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发表时间:
1983
期刊:
American journal of reproductive immunology : AJRI : official journal of the American Society for the Immunology of Reproduction and the International Coordination Committee for Immunology of Reproduction
影响因子:
--
通讯作者:
King,CR
King,CR
中科院分区:
--
文献类型:
--
作者:
Wood,GW;Johnson,B;Halsey,JF;King,CR

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用标记人IgG的直接免疫荧光法在人胎盘外膜羊膜上皮细胞和绒毛膜滋养细胞上鉴定了免疫球蛋白G (IgG)分子Fc部分(Fcγ bs)的结合位点。其结合位点与胎盘滋养细胞上的fc - γ - bs相似,具有特异性,对IgG单体具有较高的相对结合亲和力。免疫球蛋白A (IgA)和IgM与细胞膜的结合程度都不显著。未标记的IgG完全抑制其结合,但F(ab')2片段不受抑制。对分离羊膜细胞的研究表明,结合位点在细胞膜上表达。在使用的免疫组织学方法的敏感性水平上,聚集的IgG或抗原-抗体复合物未能结合羊膜上皮细胞或绒毛膜滋养细胞。这与巨噬细胞上的fc - γ bs相反,巨噬细胞存在于同一组织中,没有表现出与解聚集IgG的显著结合,而是强烈结合复合物。
Binding sites for the Fc portion of immunoglobulin G (IgG) molecules (FcγBS) were identified on amnionic epithelial cells and chorionic trophoblast cells in human extraplacental membranes using direct immunofluorescence with labeled human IgG. The binding sites are similar to FcγBS on placental trophoblast in their specificity and high degree of relative binding affinity for IgG monomers. Neither immunoglobulin A (IgA) nor IgM bound to a significant degree to the membranes. Binding was completely inhibited with unlabeled IgG but not F(ab')2 fragments of IgG. Studies on isolated amnion cells demonstrated that the binding sites are expressed on the cell membrane. At the level of sensitivity of the immunohistologic methods used, aggregated IgG or antigen‐antibody complexes failed to bind amnionic epithelial cells or chorionic trophoblasts. This is in contrast to FcγBS on macrophages which, being present in the same tissue, failed to exhibit significant binding of deaggregated IgG but bound complexes avidly.
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