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Endocrinology, Vol 136, 3461-3469, Copyright © 1995 by Endocrine Society

ARTICLES

Thyrotropin receptor-specific antibodies in BALB/cJ mice with experimental hyperthyroxinemia show a restricted binding specificity and belong to the immunoglobulin G1 subclass

NM Wagle, SA Patibandla, JS Dallas, JC Morris and BS Prabhakar
Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston 77555-1019, USA.

Immunization with the extracellular domain of TSH receptor (TSHR) led to the development of hyperthyroxinemia in BALB/cJ, but not C57BL/6J, SJL/J, and B10.BR, mice. Earlier, human studies had shown that thyroid- stimulating antibodies are predominantly of the immunoglobulin G1 (IgG1) subclass with a narrow specificity to TSHR, and antibodies that block thyroid function could be of any subclass with a broader specificity. Therefore, antibody responses in susceptible (BALB/cJ) and resistant (SJL/J) mice were characterized. There were no significant differences in the titers, relative affinities, or isotypes of antibodies against the TSHR. BALB/cJ and SJL/J sera reacted with 2 and 7 of 26 overlapping peptides from the extracellular domain of the TSHR. The ability of sera from BALB/cJ and SJL/J mice to block TSH binding to TSHR was reversed by 1 and 6 of the reactive peptides, respectively. BALB/cJ mice showed predominantly an IgG1 response against the TSHR and peptides, whereas SJL/J mice showed varying levels of all IgG subclasses. Although SJL/J sera reacted with peptides to which blocking antibodies bind, they did not show hypothyroidism, suggesting that their sera contained a mixture of blocking and stimulating antibodies that negated the effects of each other. In contrast, some TSHR-specific antibodies in BALB/cJ probably represented stimulating antibodies.


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