An ELISA for quantifying GPIHBP1 autoantibodies and making a diagnosis of the GPIHBP1 autoantibody syndrome

• Published in: Clinica chimica acta Vol. 487; pp. 174 - 178
• Main Authors: Miyashita, Kazuya, Fukamachi, Isamu, Machida, Tetsuo, Nakajima, Kiyomi, Young, Stephen G., Murakami, Masami, Beigneux, Anne P., Nakajima, Katsuyuki
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.12.2018
• Subjects: Adult; Autoantibodies - blood; Autoimmune disease; ELISA; Enzyme-Linked Immunosorbent Assay; Female; GPIHBP1 autoantibodies; Humans; Lipolysis; Lipoprotein lipase; LPL; Male; Middle Aged; Receptors, Lipoprotein - blood; Syndrome; Young Adult; LPL; Autoimmune disease; Lipoprotein lipase; GPIHBP1 autoantibodies; Lipolysis; GPIHBP1; ELISA
• ISSN: 0009-8981; 1873-3492
• DOI: 10.1016/j.cca.2018.09.039

Autoantibodies against GPIHBP1, the endothelial cell transporter for lipoprotein lipase (LPL), cause severe hypertriglyceridemia (“GPIHBP1 autoantibody syndrome”). Affected patients have low serum GPIHBP1 and LPL levels. We report the development of a sensitive and specific ELISA, suitable for routine clinical use, to detect GPIHBP1 autoantibodies in serum and plasma. Serum and plasma samples were added to wells of an ELISA plate that had been coated with recombinant human GPIHBP1. GPIHBP1 autoantibodies bound to GPIHBP1 were detected with an HRP-labeled antibody against human immunoglobulin. Sensitivity, specificity, and reproducibility of the ELISA was evaluated with plasma or serum samples from patients with the GPIHBP1 autoantibody syndrome. A solid-phase ELISA to detect and quantify GPIHBP1 autoantibodies in human plasma and serum was developed. Spiking recombinant human GPIHBP1 into the samples reduced the ability of the ELISA to detect GPIHBP1 autoantibodies. The ELISA is reproducible and sensitive; it can detect GPIHBP1 autoantibodies in samples diluted by >1000-fold. We have developed a sensitive and specific ELISA for detecting GPIHBP1 autoantibodies in human serum and plasma; this assay will make it possible to rapidly diagnose the GPIHBP1 autoantibody syndrome. •GPIHBP1 autoantibodies cause severe hypertriglyceridemia (chylomicronemia).•An ELISA to measure GPIHBP1 autoantibodies in serum or plasma was developed.•The ELISA is sensitive, capable of detecting GPIHBP1 autoantibodies.•This assay is useful for diagnosing the GPIHBP1 autoantibody syndrome.