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Related Experiment Videos

Thyroid hormone transporters.

E C H Friesema1, J Jansen, T J Visser

  • 1Department of Internal Medicine, Erasmus University Medical Center, Room Ee502, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands.

Biochemical Society Transactions
|January 26, 2005
PubMed
Summary
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Thyroid hormone transport into cells is crucial for brain development and metabolism. Specific transporters like MCT8 are vital for thyroid hormone action, with mutations causing severe developmental issues.

Area of Science:

  • Endocrinology
  • Neuroscience
  • Molecular Biology

Background:

  • Thyroid hormone, primarily thyroxine (T4) and triiodothyronine (T3), regulates critical physiological processes including brain development and metabolism.
  • Intracellular deiodinases and receptors necessitate cellular transport of iodothyronines across cell membranes.
  • Specific transporters are essential for thyroid hormone action and metabolism.

Purpose of the Study:

  • To review the identified transporters involved in cellular uptake of iodothyronines.
  • To highlight the roles of OATP1C1 and MCT8 in thyroid hormone transport, particularly in the brain.
  • To discuss the implications of MCT8 gene mutations.

Main Methods:

  • Literature review of identified iodothyronine transporters.

Related Experiment Videos

  • Analysis of the specific roles of OATP1C1 and MCT8 in thyroid hormone transport across biological barriers.
  • Examination of the genetic basis and clinical consequences of MCT8 mutations.

    • Main Results:

    • Several transporters capable of cellular iodothyronine uptake have been identified.
    • OATP1C1 and MCT8 are key transporters, with OATP1C1 implicated in T4 transport across the blood-brain barrier and MCT8 in T3 transport into neurons.
    • Mutations in the MCT8 gene on chromosome Xq13 lead to X-linked psychomotor retardation and altered serum T3 levels.

    Conclusions:

    • Specific iodothyronine transporters, notably OATP1C1 and MCT8, are critical for thyroid hormone homeostasis and function.
    • MCT8 plays a vital role in neuronal thyroid hormone supply, and its dysfunction has severe neurological consequences.
    • Understanding these transporters is key to comprehending thyroid hormone's impact on development and metabolism.