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Related Experiment Videos

Effect of thyroid function on LDL oxidation in hypothyroidism and hyperthyroidism.

Aysin Oge1, E Sozmen, A O Karaoglu

  • 1Department of Internal Medicine, School of Medicine, Adnan Menderes University, Aydin, Turkey. aoge@adu.edu.tr

Endocrine Research
|November 24, 2004
PubMed
Summary

Thyroid disorders increase low-density lipoprotein (LDL) oxidation, a key factor in atherosclerosis. Treatment normalizes LDL oxidation in both hypothyroidism and hyperthyroidism, potentially reducing cardiac disease risk.

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Area of Science:

  • Endocrinology
  • Cardiovascular Medicine
  • Lipid Metabolism

Background:

  • Oxidized low-density lipoproteins (LDL) are implicated in atherosclerosis initiation.
  • Hypothyroidism is linked to hypercholesterolemia and increased atherosclerosis risk.
  • Hyperthyroidism, while not increasing LDL cholesterol, is associated with elevated oxidized LDL.

Purpose of the Study:

  • To evaluate changes in LDL oxidation in patients with hypothyroidism and hyperthyroidism.
  • To investigate the effects of treatment on LDL oxidation and lipid profiles in these thyroid conditions.
  • To understand the role of enhanced LDL oxidation in the cardiac disease process associated with thyroid dysfunction.

Main Methods:

  • Studied 32 hypothyroid and 16 hyperthyroid patients before and after achieving euthyroid state with treatment.

Related Experiment Videos

  • Measured plasma lipids and lipoproteins.
  • Assessed LDL oxidizability by determining malonaldehyde bis (dimethyacetyl) (MDA) and diene conjugation levels.

    • Main Results:

    • LDL diene content increased in hypothyroidism, decreasing after T4 supplementation (p < .001).
    • LDL diene content increased in hyperthyroidism, decreasing after treatment (p < .05).
    • LDL oxidation markers (dienes, MDA) decreased significantly in both hypothyroid and hyperthyroid patients after treatment rendered them euthyroid.

    Conclusions:

    • Both hypothyroidism and hyperthyroidism are associated with enhanced LDL oxidation.
    • Treatment leading to a euthyroid state effectively reduces LDL oxidation in both conditions.
    • Increased LDL oxidation may contribute to cardiac disease in patients with thyroid dysfunction.