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- W2024771831 abstract "A colorimetric enzyme-linked immunosorbent assay (ELISA) was developed to detect circulating levels of rPSGL to permit pharmacokinetic analysis of clinical samples. The ELISA is an asymmetric sandwich utilizing a monoclonal antibody pair. Initial validation studies indicated that 57% of normal individuals scored above the limit of detection of the assay. Specificity experiments indicated that the signal was not due to circulating endogenous P-selectin glycoprotein ligand-1 (PSGL-1). Using matrix-assisted laser desorption ionization mass spectrometry (MALDI MS) and sampling within the individual microplate wells, the interferant was detected in the vicinity of 6.6 kDa in lipemic and normal human sera, but not delipidized sera. These results were consistent with the ELISA data where 97.5% of known lipemic, 57% of normal, and 0% of delipidized sera scored above detectable limits in the ELISA. Preparative isolations of the 6.6 kDa species were performed using reversed-phase high performance liquid chromatography (RP-HPLC) with UV and MS detection. Edman N-terminal sequencing identified the 6.6 kDa unknown as Apolipoprotein C-I. Additional apolipoproteins were found by MALDI and RP-HPLC. Digestion of sera with liposome lipase and extraction of sera with anti-apolipoprotein C-I, C-II, and C-III antibody beads significantly reduced the ELISA interference. These experiments combined with the MALDI detection of phosphatidylcholine-type lipids from NHS eluate suggested that lipoprotein particles or remnants were causing the interference. A method combining Triton-X 100 with sonication was developed to overcome this interference without altering rPSGL recovery in the ELISA." @default.
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- W2024771831 date "2001-09-01" @default.
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- W2024771831 title "Identification of human serum interferants in the recombinant P-selectin glycoprotein ligand-1 clinical ELISA using MALDI MS and RP-HPLC" @default.
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- W2024771831 doi "https://doi.org/10.1016/s0022-1759(01)00421-5" @default.
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