title: Real-Time, label-free monitoring of tumor antigen and serum antibody interactions.
abstract: Conventional techniques for the detection of biomolecular interactions can be limited by the need for exogenous labels, time- and labor-intensive protocols, as well as by poor sensitivity levels. A refractometer instrument has been reconfigured to detect biomolecular interactions through changes in surface plasmon resonance (SPR). The binding kinetics and affinity values of anti-NY-ESO-1 monoclonal antibody, ES121, to the cancer-testis antigen NY-ESO-1 were determined according to the surface heterogeneity model and resulted in K(D) values of 1.3x10(-9) and 2.1x10(-10) M. The reconfigured instrument was then used to measure the interaction between tumor antigens and serum antibodies against these antigens in preselected cancer patient sera samples. The tumor antigens assayed included NY-ESO-1, SSX2 and p53, all used as recombinant proteins containing polyhistidine tags. These results demonstrated that the instrument is capable of detecting the binding of serum antibodies from cancer patient sera to immobilized tumor antigens, consistent with those observed previously in ELISA-based experiments. These results demonstrate the potential of SPR technology for the rapid diagnosis and monitoring immune responses.
authors.affiliation: Field of Microbiology, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Christine
authors.initials: C
authors.lastname: Campagnolo
authors.forename: Katherine J
authors.initials: KJ
authors.lastname: Meyers
authors.forename: Thomas
authors.initials: T
authors.lastname: Ryan
authors.forename: Robert C
authors.initials: RC
authors.lastname: Atkinson
authors.forename: Yao-Tseng
authors.initials: YT
authors.lastname: Chen
authors.forename: Matt J
authors.initials: MJ
authors.lastname: Scanlan
authors.forename: Gerd
authors.initials: G
authors.lastname: Ritter
authors.forename: Lloyd J
authors.initials: LJ
authors.lastname: Old
authors.forename: Carl A
authors.initials: CA
authors.lastname: Batt
mesh_terms: D000911:Antibodies, Monoclonal / Q000097:blood* / Q000276:immunology*; D000937:Antigen-Antibody Reactions; D000951:Antigens, Neoplasm / Q000097:blood* / Q000276:immunology*; D001774:Blood Chemical Analysis / Q000295:instrumentation / Q000379:methods; D003199:Computer Systems; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation / Q000379:methods*; D008297:Male; D008565:Membrane Proteins / Q000097:blood* / Q000276:immunology*; D012031:Refractometry / Q000295:instrumentation / Q000379:methods*; D013194:Staining and Labeling; D020349:Surface Plasmon Resonance / Q000379:methods*; D013736:Testicular Neoplasms / Q000097:blood / Q000175:diagnosis / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; C104948:CTAG1B protein, human; D008565:Membrane Proteins