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Related Experiment Videos

Linking iodine with autoimmune thyroiditis.

N R Rose1, L Rasooly, A M Saboori

  • 1Department of Molecular Microbiology and Immunology, The Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA. nrrose@jhsph.edu

Environmental Health Perspectives
|September 30, 1999
PubMed
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Iodine exposure directly triggers autoimmune thyroiditis by altering thyroglobulin structure and enhancing T-cell responses. This study highlights iodine

Area of Science:

  • Immunology
  • Endocrinology
  • Autoimmunity

Background:

  • Circumstantial evidence links iodine to increased autoimmune thyroiditis.
  • Human T cells show specific proliferation to iodinated thyroglobulin.

Purpose of the Study:

  • To investigate the direct role of iodine in inducing autoimmune thyroiditis.
  • To elucidate the molecular and immunological mechanisms involved.

Main Methods:

  • Human T-cell proliferation assays with iodinated/non-iodinated thyroglobulin.
  • Monoclonal antibody analysis of antigenic determinants.
  • Utilizing the nonobese diabetic (NOD)-H2(h4) mouse model with iodine supplementation.
  • Adoptive transfer of immune cells.

Main Results:

Related Experiment Videos

  • Iodine alters thyroglobulin conformation, creating new antigenic determinants, including one linked to thyroxine.
  • Iodine supplementation markedly increases autoimmune thyroiditis prevalence and severity in NOD-H2(h4) mice.
  • Immune responses are specific to thyroglobulin, with IgG2b antibody predicting lesions.
  • Iodine feeding enhances T-cell responses to thyroglobulin in susceptible mice.

Conclusions:

  • Iodine acts as an environmental trigger, increasing the autoantigenic potency of thyroglobulin.
  • This leads to the induction of autoimmune thyroiditis in genetically susceptible individuals.
  • The NOD-H2(h4) mouse model is valuable for studying iodine's role in autoimmunity.