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- W2153313883 abstract "BACKGROUND HLA-G in biological fluids has been proposed to be useful as a tumor marker as both a diagnostic and prognostic factor. Most HLA-G measurement procedures are based on ELISA methods using highly specific antibodies. However, results of published studies are in conflict regarding the clinical utility and even the nature of HLA-G present in circulation. METHODS We collected 118 exudates, 94 from cancer patients and 24 from patients without tumors. We measured HLA-G concentrations by ELISA using MEM-G/9 or G233 as capture antibody. Samples were immunoprecipitated with an anti–HLA-G antibody and analyzed by Western blot using a different anti–HLA-G antibody. RESULTS Discrepancies in HLA-G concentrations in exudates were observed depending on what capture anti–HLA-G antibody was used for ELISA (r = 0.376). These discrepancies were not observed when the ELISAs were performed using culture supernatants from HLA-G1–transfected cells (r = 0.983). Immunoprecipitation and Western blot of cell culture supernatants with 2 different anti–HLA-G antibodies produced the typical band at 39 kDa assigned to HLA-G. When the immunoprecipitation and western blot were performed with exudates, however, there were bands at 53 kDa and 70–76 kDa, higher molecular weights than those usually assigned to HLA-G. These HLA-G–like molecules were associated with β2-microglobulin and could also form disulfide bridges with other HLA-G–like molecules. CONCLUSIONS The main HLA-G antigenic molecules in exudates are HLA-G–like complexes, a factor that should be considered when analyzing HLA-G in biological fluids." @default.
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- W2153313883 date "2011-07-01" @default.
- W2153313883 modified "2023-10-11" @default.
- W2153313883 title "Identification of Circulating Nonclassic Human Leukocyte Antigen G (HLA-G)–Like Molecules in Exudates" @default.
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- W2153313883 doi "https://doi.org/10.1373/clinchem.2010.159673" @default.
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