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• W1970889448 abstract "Thyrotropin (TSHR) receptor antibodies that bind to the TSHR without stimulating the TSHR have been identified with a direct binding assay. Moreover, TSHR antibodies that exhibit thyroid epithelial cell stimulation without inhibition of 125I-bovine thyrotropin (bTSH) binding and vice versa have been described. These data suggest that stimulation or blocking of the TSHR by stimulating (TSAB) or blocking (TSBAB) TSHR antibodies could be possible without detectable bTSH-displacement activity. However, to date, possible differences between TSAB or TSBAB activity and inhibition of 125I-bTSH binding have not been systematically investigated. Therefore we compared inhibition of 125I-bTSH binding and TSAB or TSBAB activity of sera from 113 patients with Graves' disease treated with antithyroid drugs. To exclude the different assay conditions of previous investigations as possible confounding factors, we determined TSAB or TSBAB and inhibition of 125I-bTSH binding (TBIIW) with the same Chinese hamster ovary (CHO) cells expressing the human TSHR. Furthermore inhibition of 125I-bTSH binding was also determined as thyrotropin-binding inhibitory immunoglobulin (TBII) with solubilized porcine thyroid membranes (TRAK, Brahms, Berlin Germany) and the highly sensitive recombinant human TSH receptor assay (hTRAK, Brahms, Berlin Germany). Only 78% (54/69) of TSAB-positive and 78% (21/27) of TSBAB-positive sera detected with JP26 cells exhibit inhibition of 125I-bTSH binding measured as TBII or TBIIW. Furthermore, 59% (10/17) of sera without TSAB and TSBAB activity revealed inhibition of 125I-bTSH binding measured as TBII or TBIIW. We found significant differences between TSHR bioactivities (TSAB or TSBAB) and inhibition of 125I-bTSH binding. Moreover, there was no agreement between the detectable TSHR bioactivities (TSAB or TSBAB) and their detectable inhibition of 125I-bTSH binding. Therefore, it is very likely that TSH displacement by TSHR antibodies and stimulation or blocking of the TSHR by TSHR antibodies are different functions that do not need to occur together." @default.
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• W1970889448 date "2000-10-01" @default.
• W1970889448 modified "2023-09-24" @default.
• W1970889448 title "Differences Between Thyrotropin Receptor Antibody Bioactivity and Inhibition of125l-Bovine Thyrotropin Binding" @default.
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• W1970889448 doi "https://doi.org/10.1089/thy.2000.10.897" @default.
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