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Triiodothyronine modulates thymocyte migration.

M M Ribeiro-Carvalho1, K R F Lima-Quaresma1, T Mouço1

  • 1Laboratory on Thymus Research, Department of Immunology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, BrazilMiguelote Viana Central Laboratory, Niterói, BrazilLaboratory of Inflammation, Department of Physiology and Pharmacodynamics, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil;Department of Histology and Embryology, Biomedical Sciences Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.

Scandinavian Journal of Immunology
|June 26, 2007
PubMed
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Thyroid hormone triiodothyronine (T3) enhances extracellular matrix (ECM) production in the thymus. This boosts thymocyte migration, crucial for T-cell development.

Area of Science:

  • Immunology
  • Endocrinology
  • Cell Biology

Background:

  • Triiodothyronine (T3) influences thymus physiology.
  • T3 stimulates thymic microenvironmental cells to increase extracellular matrix (ECM) production.
  • ECM moieties are critical for thymocyte migration.

Purpose of the Study:

  • To investigate the in vivo effects of T3 on ECM production.
  • To examine the influence of T3 on ECM-related T-cell migration events.

Main Methods:

  • BALB/c mice received long-term (30 days) or short-term (16 h) T3 treatment.
  • Expression of fibronectin and laminin was analyzed in thymic lobules.
  • Expression of ECM protein receptors (VLA-4, VLA-5, VLA-6) on thymocytes was assessed.
  • In vitro studies used thymic nurse cells (TNC) and transwell chambers to evaluate thymocyte migration.

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Main Results:

  • T3 treatment increased fibronectin and laminin expression in the thymus.
  • Long-term T3 treatment elevated ECM receptor expression on thymocytes.
  • T3 administration enhanced thymocyte exit from TNC complexes ex vivo.
  • T3-treated thymocytes showed increased migration across ECM-coated transwell inserts.

Conclusions:

  • In vivo T3 treatments modulate thymocyte migration.
  • ECM-mediated interactions are likely involved in T3-induced thymocyte migration.
  • T3 plays a significant role in regulating thymocyte trafficking within the thymus.