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Endocrinology, Vol 120, 1104-1111, Copyright © 1987 by Endocrine Society

ARTICLES

Monoclonal antibodies to human thyroglobulin as probes for thyroglobulin structure

MH De Baets, R Theunissen, K Kok, JJ de Vijlder and PJ van Breda Vriesman

A panel of monoclonal antibodies (mAbs) against human thyroglobulin (hTg) was obtained by somatic fusion of the nonsecreting myeloma cell line P3X66 Ag8/0 and spleen cells of Balb/c mice immunized with purified hTg. Antibody secreting clones were selected by solid phase enzyme immunoassay and analyzed for cross-reaction with Tg from several animal species. Twelve out of 15 mAbs cross-reacted with both rat and mouse Tg and 11 Mabs cross-reacted with bovine Tg. The cross-reaction with mouse Tg paralleled that of rat Tg, whereas discrete differences between the cross-reactivity patterns with bovine Tg were observed. Two clones secreted mAbs specific for hTg. We further characterized the mAbs and found that three mAbs recognized T4-containing determinants and one mAb reacted with both T4 and T3-containing determinants on the Tg molecule. The binding of the mAbs to hormonogenic determinants depended upon the thyroid hormone content of the molecule and the integrity of the three dimensional structure of Tg. One other mAb reacted with four peptides of CNBr-cleaved hTg, indicating the recognition of a repetitive determinant in the hTg molecule distinct from the hormonogenic regions.




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Endocrinology Endocrine Reviews J. Clin. End. & Metab.
Molecular Endocrinology Recent Prog. Horm. Res. All Endocrine Journals
Copyright © 1987 by The Endocrine Society