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• W2057091903 abstract "The present study was designed to characterize monoclonal antibodies (mAbs) specific for the free beta-subunit of hCG (free hCG beta), to develop two-site immunoradiometric assays (m-IRMAs) specific for free hCG beta, and to study the reactivities of various molecular forms of hCG beta in these assays. We attempted first to delineate the antigenic regions present specifically on the free hCG beta by studying the binding pattern of seven mAbs directed preferentially to hCG beta, designated FBT11, P8E, P10F, HB2, P5D, P5H, and INN-64. Competitive inhibition experiments performed by RIA demonstrated the specificity of these mAbs for the free hCG beta as noncross-reacting with the beta-subunit of human (h) LH beta. m-IRMAs were used to analyze the arrangement of epitopes on hCG beta. Experiments performed with the seven mAbs used either as capture antibodies or radiolabeled indicators confirmed the specificity of the seven mAbs for the free hCG beta, and that mAbs FBT11, P8E, and P10F bound to equine LH beta (eLH beta), but did not bind to a fragment of hCG beta called the beta-core fragment (beta CF). These antibodies defined an antigenic domain identified as A. In contrast, mAb HB2 bound neither to eLH beta (e beta) nor to beta CF and was directed to domain B (e beta negative, beta CF negative). Finally, mAbs P5D, P5H, and INN-64 bound to beta CF, but did not bind to eLH beta, and defined a third domain identified as C (e beta negative, beta CF positive). Collectively, these results demonstrate that at least six antigenic domains are present on the free hCG beta and that a limited set of amino acids was shared among these domains; domains A, B, and C are present only on the free beta-subunit, while three other domains recognized by mAbs FB19, FBT10, and 518B7 are present on both free hCG beta and hCG. Thus, most of the surface of the hCG beta appears to be antigenic and accessible to antibody binding. Three different m-IRMAs specific for free hCG beta were then constructed using either mAb FBT11 (domain A) or HB2 (domain B). The study of the reactivities of various molecular forms of hCG beta in these assays demonstrated that the recognition of hCG beta forms nicked at position 43 (beta 43), 44, and/or 51 (beta 44/51) varied between assays.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W2057091903 date "1992-10-01" @default.
• W2057091903 modified "2023-09-25" @default.
• W2057091903 title "Monoclonal antibodies to the free beta-subunit of human chorionic gonadotropin define three distinct antigenic domains and distinguish between intact and nicked molecules." @default.
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• W2057091903 doi "https://doi.org/10.1210/endo.131.4.1382962" @default.
• W2057091903 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1382962" @default.
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