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- W2091134590 abstract "Membrane-anchored and soluble human leukocyte antigen HLA-G (sHLA-G) molecules exert strong inhibiting signals after interaction with their cognate receptors ILT2 (CD85j), ILT4 (CD85d), and KIR2DL4 (CD158d) that are differentially expressed by natural killer cells, T cells, and antigen-presenting cells. These inhibitory functions can become operative in conditions in which such immune cells try to attack viral infected or tumor cells. Recently, clinical studies showed that sHLA-G molecules are also relevant in the prediction of allograft acceptance after heart transplantation, liver-kidney cotransplantation, and the successful implantation and development of embryos after in vitro fertilization. In view of this diagnostic potential, reliable methods for the measurement of sHLA-G molecules in various body fluids are of interest. Thus, the aims of the Wet Workshop for measurement of sHLA-G held in Essen, Germany (at the Institute of Immunology October 18-20, 2004) were to select and validate HLA-G-specific enzyme-linked immunosorbent assay (ELISA) formats and purified standard HLA-G proteins, which can be easily generated and used as consensual references. To this end, the antibody combinations monoclonal antibody (mAb) MEM-G/9 (capture) + anti-beta2m (detection) and the mAb 5A6G7 (capture) + mAb W6/32 (detection) were chosen in an ELISA format for the simultaneous determination of shed HLA-G1 + soluble HLA-G5 (sHLA-G1 + HLA-G5) and for the exclusive detection of HLA-G5 molecules, respectively. As standard, protein HLA-G5 molecules were purified from insect SF9 cells coinfected by HLA-G5 + human beta2m and characterized for their antigenic determinants. A total of 24 members in 13 teams participated in the 3-day sHLA-G Wet Workshop. All workshop materials, protocols, standard reagents, and samples were provided to each team by the organizers. The Wet-Workshop results clearly demonstrated that (1) the HLA-G5 standard reagent was equally detected by both ELISA formats; (2) sHLA-G1 + G5 and HLA-G5 molecules, respectively, were specifically detected by the two ELISA formats; and (3) both ELISA formats measure reproducibly the amounts of sHLA-G. The comparison of the two ELISA results obtained evidenced that in healthy donors sHLA-G1 molecules can exist in body fluids besides HLA-G5. Moreover, a novel soluble HLA-G structure can be predicted that is recognized by the mAb 5A6G7 + mAb W6/32 antibody combination, but not by the one of mAb MEM-G/9 + anti-beta2m." @default.
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- W2091134590 date "2005-08-01" @default.
- W2091134590 modified "2023-10-11" @default.
- W2091134590 title "Report of the Wet Workshop for Quantification of Soluble HLA-G in Essen, 2004" @default.
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- W2091134590 doi "https://doi.org/10.1016/j.humimm.2005.05.003" @default.
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