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Related Experiment Videos

Lipoprotein-thyroid hormone interactions.

S Benvenga1, J Robbins

  • 1Salvatore Benvenga is at the Section of Endocrinology, University of Messina School of Medicine, Messina, Italy.

Trends in Endocrinology and Metabolism: TEM
|August 1, 1993
PubMed
Summary
This summary is machine-generated.

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Thyroid hormones bind to lipoproteins like LDL, which are then taken up by cells. This interaction enhances thyroid hormone (T4) uptake by cells expressing LDL receptors, suggesting a new pathway for hormone transport.

Area of Science:

  • Endocrinology
  • Lipid Metabolism
  • Cellular Biology

Background:

  • Thyroid hormones circulate in plasma, with a portion bound to lipoproteins.
  • High-density lipoprotein (HDL) is the major carrier, but low-density lipoprotein (LDL) interactions were investigated due to well-characterized receptors.

Purpose of the Study:

  • To investigate the role of lipoprotein interactions in cellular uptake of thyroid hormones.
  • To determine if LDL enhances thyroid hormone entry into cells.

Main Methods:

  • Utilized human fibroblasts with genetically absent and expressed LDL receptors.
  • Tested the effect of LDL on the uptake of thyroxine (T4).

Main Results:

  • LDL significantly enhanced the uptake of T4 by cultured fibroblasts expressing LDL receptors.

Related Experiment Videos

  • Identified and partially characterized T4 binding sites on apolipoproteins B-100, E, and apoA-I, noting homology.

    • Conclusions:

    • Lipoprotein interactions, particularly with LDL, can enhance cellular thyroid hormone uptake.
    • The findings suggest a novel mechanism for thyroid hormone transport into cells via lipoproteins.