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A functional site on the human TSH receptor: a potential therapeutic target in Graves' disease

Alan P Johnstone1, Jeremy C Cridland, Clive R Da Costa

  • 1Cellular and Molecular Sciences Group, St George's Hospital Medical School, Guy's, King's and St Thomas' Hospitals Medical and Dental Schools, London, UK. sggf600@sghms.ac.uk

Clinical Endocrinology
|September 27, 2003
PubMed
Abstract

Insights

Researchers identified specific TSH-receptor residues (381-384) crucial for thyroid stimulation in Graves' disease. This finding may lead to targeted therapies for patients with this autoimmune thyroid condition.

Area of Science:

  • Endocrinology
  • Immunology
  • Molecular Biology

Background:

  • Graves' disease involves autoantibodies pathologically stimulating the thyroid.
  • Targeting the TSH-receptor (TSHR) is a potential therapeutic strategy.
  • Identifying specific TSHR sites involved in autoantibody binding is crucial.

Purpose of the Study:

  • To identify TSH-receptor sites involved in pathological stimulation by autoantibodies in Graves' disease.
  • To develop novel therapeutic approaches for Graves' disease.

Main Methods:

  • Utilized heterologous cells expressing recombinant human TSHR.
  • Stimulated cells with TSH or serum from Graves' disease patients.
  • Measured cyclic adenosine monophosphate (cAMP) responses and assessed inhibition by monoclonal antibodies.

Main Results:

  • Monoclonal antibodies targeting TSHR residues 381-384 inhibited TSH-stimulated cAMP production.
  • These antibodies also inhibited cAMP production induced by sera from approximately 40% of Graves' disease patients.
  • The TSHR epitope 381-384 is implicated in both normal and pathological thyroid stimulation.

Conclusions:

  • Residues 381-384 of the human TSH-receptor are critical for thyroid stimulation.
  • This epitope is a key target for autoantibodies in Graves' disease.
  • Developing therapies targeting this epitope offers potential for specific treatment of some Graves' disease patients.

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