Figure. 2.
The plasma of the patient treated with IFN β1a contains immunoglobulins that bind to GPIHBP1 in a dose-dependent manner. uPAR-tagged human GPIHBP1 produced in Drosophila S2 cells was captured on an ELISA plate with the uPAR-specific monoclonal antibody R24. Serial dilutions of the patient plasma samples (pre-heparin and post-heparin samples) were applied to the wells and incubated overnight. Immunoglobulins bound to GPIHBP1 were detected with an HRP-labeled goat anti-human IgG/IgM. Plasma samples from a normal control and a subject with GPIHBP1 antibodies (AutoAb control)13 were included as negative and positive controls, respectively. HRP, horseradish peroxidase; GPIHBP1, glycosylphosphatidylinositol-anchored high-density lipoprotein–binding protein 1.