title: Development of Immunocapture-LC/MS Assay for Simultaneous ADA Isotyping and Semiquantitation.
abstract: Therapeutic proteins and peptides have potential to elicit immune responses resulting in anti-drug antibodies that can pose problems for both patient safety and product efficacy. During drug development immunogenicity is usually examined by risk-based approach along with specific strategies for developing "fit-for-purpose" bioanalytical approaches. Enzyme-linked immunosorbent assays and electrochemiluminescence immunoassays are the most widely used platform for ADA detection due to their high sensitivity and throughput. During the past decade, LC/MS has emerged as a promising technology for quantitation of biotherapeutics and protein biomarkers in biological matrices, mainly owing to its high specificity, selectivity, multiplexing, and wide dynamic range. In fully taking these advantages, we describe here an immunocapture-LC/MS methodology for simultaneous isotyping and semiquantitation of ADA in human plasma. Briefly, ADA and/or drug-ADA complex is captured by biotinylated drug or anti-drug Ab, immobilized on streptavidin magnetic beads, and separated from human plasma by a magnet. ADA is then released from the beads and subjected to trypsin digestion followed by LC/MS detection of specific universal peptides for each ADA isotype. The LC/MS data are analyzed using cut-point and calibration curve. The proof-of-concept of this methodology is demonstrated by detecting preexisting ADA in human plasma.
authors.affiliation: Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT 06877, USA.
authors.forename: Lin-Zhi
authors.identifier: 0000-0003-3696-3119
authors.initials: LZ
authors.lastname: Chen
authors.affiliation: Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT 06877, USA.
authors.forename: David
authors.identifier: 0000-0001-8218-1404
authors.initials: D
authors.lastname: Roos
authors.affiliation: Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT 06877, USA.
authors.forename: Elsy
authors.identifier: 0000-0002-9076-0745
authors.initials: E
authors.lastname: Philip
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001688:Biological Products / Q000737:chemistry / Q000276:immunology; D001710:Biotin / Q000737:chemistry; D001798:Blood Proteins / Q000737:chemistry / Q000276:immunology; D002138:Calibration; D002846:Chromatography, Affinity / Q000379:methods*; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D007136:Immunoglobulins / Q000097:blood* / Q000145:classification; D013058:Mass Spectrometry / Q000379:methods*; D051379:Mice; D008969:Molecular Sequence Data; D058889:Molecular Typing; D019809:Streptavidin / Q000737:chemistry
chemical_list: D001688:Biological Products; D001798:Blood Proteins; D007136:Immunoglobulins; C026080:plasma protein Z; D001710:Biotin; D019809:Streptavidin