title: Multiplexed determination of protein biomarkers using metal-tagged antibodies and size exclusion chromatography--inductively coupled plasma mass spectrometry.
abstract: A liquid-phase immunoassay was developed for the simultaneous determination of five cancer biomarker proteins: alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), carcinoembryonic antigen (CEA), ovarian tumor antigen (CA125/MUC16), and gastrointestinal tumor antigen (CA19-9). The method was based on the incubation of a serum (or tissue cytosol) with five antibodies, each labeled with a different lanthanide (Pr(3+), Eu(3+), Gd(3+), Ho(3+), and Tb(3+), respectively) followed by the specific determination of the immunocomplex formed by size exclusion chromatography with inductively coupled plasma mass spectrometric detection (SEC-ICPMS). The sensitivity of the method was comparable with that attainable by enzyme-linked immunosorbent assay (ELISA) or radioimmunoassay with the advantages of multiplexed analysis capacity, virtually no sample preparation, and sample amount consumption, ca. 3 times lower than an ELISA test. The method was validated for the analysis of the proteins in human serum and proved to be able to discriminate ovary and uterus tumor tissue samples from those of healthy subjects.
authors.affiliation: Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università degli Studi di Parma, Viale G. P. Usberti 17/A, I-43100 Parma, Italy. mattia.terenghi@nemo.unipr.it
authors.forename: Mattia
authors.initials: M
authors.lastname: Terenghi
authors.forename: Lisa
authors.initials: L
authors.lastname: Elviri
authors.forename: Maria
authors.initials: M
authors.lastname: Careri
authors.forename: Alessandro
authors.initials: A
authors.lastname: Mangia
authors.forename: Ryszard
authors.initials: R
authors.lastname: Lobinski
mesh_terms: D000368:Aged; D000911:Antibodies, Monoclonal / Q000737:chemistry*; D014408:Biomarkers, Tumor / Q000097:blood*; D002623:Chemistry Techniques, Analytical; D002850:Chromatography, Gel / Q000379:methods*; D005260:Female; D006801:Humans; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D010051:Ovarian Neoplasms / Q000097:blood*; D014594:Uterine Neoplasms / Q000097:blood*
chemical_list: D000911:Antibodies, Monoclonal; D014408:Biomarkers, Tumor; D028581:Lanthanoid Series Elements