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Journal of Endocrinological Investigation

, Volume 13, Issue 4, pp 327–331 | Cite as

Hyperthyroidism and hypothyroidism in monozygotic twins: Detection of stimulating and blocking THS receptor antibodies using the FRTL5-cell line

  • A. Ilicki
  • C. Marcus
  • F. A. Karlsson
Case Report

Abstract

We present a rare history of monozygotic twin girls who at the age of 10 yr presented with hyper- and hypothyroidism, respectively. Both girls had antibodies against thyrotropin receptors as measured by a radioreceptor assay (230 U/l and 1400 U/l; reference range < 7 U/l). The sera were further examined in a bioassay, based on a ratthyroid cell line(FRTL5), in which release of cAMP into medium was measured. The TSH receptor anti-bodies of the hyperthyroid twin displayed a ratio of radioreceptor to biological activity typical of Graves’ disease. In contrast, the antibodies of the hypothyroid twin acted as pure antagonists at the TSH receptor level. The occurrence of TSH receptor antibodies in these monozygotic twins suggests a similar pathogenesis of Graves’ disease and that of hypothyroidism due to thyroid blocking antibodies.

Key-words

Stimulating and blocking TSH-receptor antibodies Graves’ disease hypothyroidism FRTL5-cells 

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Copyright information

© Italian Society of Endocrinology (SIE) 1990

Authors and Affiliations

  • A. Ilicki
    • 1
  • C. Marcus
    • 2
  • F. A. Karlsson
    • 3
  1. 1.Departments of Paediatrics, University HospitalUppsala UniversityUppsalaSweden
  2. 2.Karolinska InstitutetHuddinge SjukhusStockholmSweden
  3. 3.Department of Internal MedicineUniversity HospitalUppsalaSweden

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