Soluble HLA‐G: Purification from Eukaryotic Transfected Cells and Detection by a Specific ELISA
- 1 July 1999
- journal article
- Published by Wiley in American Journal of Reproductive Immunology
- Vol. 42 (1), 22-29
- https://doi.org/10.1111/j.1600-0897.1999.tb00461.x
Abstract
The detection of soluble forms of human leukocyte antigen-G molecule (sHLA-G) at the maternal-fetal interface suggest that sHLA-G may play a role during pregnancy. To study the potential functions of sHLA-G, we developed a procedure to detect and produce such HLA-G isoforms. Transfected cell lines expressing either sHLA-G1s cDNA (JAR-G1s) or an sHLA-G monochain DNA (Fox-G-mono) containing extracellular domains of HLA-G linked to the human beta 2-microglobulin were used. Specific sHLA-G enzyme-linked immunosorbent assay (ELISA), using anti-HLA-G monoclonal antibodies (mAbs) (87G and BFL.1) as coating antibodies and the biotinylated HLA class I mAb, W6/32, to reveal the bound molecules, was then developed. To assess the specificity of the ELISA, we tested cell culture supernatants from the trophoblast-derived JEG-3 cell line and the HLA-G1s-transfected JAR cells, and we detected sHLA-G in both supernatants. sHLA-G monochain was also detected by ELISA in transfected cell supernatants using the conformational mAb, W6/32, showing that the conformation of sHLA-G monochain was proper. Using the same ELISA, sHLA-G was detected in various samples of amniotic fluid. To test the potential role of sHLA-G, sHLA-G has been purified by immunoaffinity columns, using W6/32 mAb, from culture supernatants of HLA-G1s or sHLA-G monochain-transfected cells. These important tools will be useful both for the detection of sHLA-G in various biological fluids and in functional tests.Keywords
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