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Related Experiment Videos

Both hypothyroidism and hyperthyroidism enhance low density lipoprotein oxidation

V Sundaram1, A N Hanna, L Koneru

  • 1Department of Internal Medicine, Ohio State University, Columbus 43210, USA.

The Journal of Clinical Endocrinology and Metabolism
|November 5, 1997
PubMed
Summary

Hypothyroidism and hyperthyroidism increase low-density lipoprotein (LDL) oxidation, potentially contributing to cardiac disease. Restoring euthyroid states significantly reduces this LDL oxidation susceptibility.

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Area of Science:

  • Endocrinology
  • Cardiovascular Medicine
  • Biochemistry

Background:

  • Hypothyroidism is linked to hypercholesterolemia and atherosclerosis risk.
  • Hyperthyroidism can trigger angina or myocardial infarction in patients with coronary heart disease.
  • Thyroid hormones, specifically L-T4, exhibit antioxidant properties and inhibit LDL oxidation in vitro.

Purpose of the Study:

  • To evaluate changes in low-density lipoprotein (LDL) oxidation in individuals with hypothyroidism and hyperthyroidism.
  • To assess the impact of thyroid dysfunction on LDL susceptibility to oxidation.
  • To compare LDL oxidation status in hypothyroid, hyperthyroid, and euthyroid states.

Main Methods:

  • Collected fasting blood samples for LDL oxidation analysis, lipoprotein determination, and thyroid function tests.

Related Experiment Videos

  • Measured the lag phase of copper-catalyzed LDL oxidation.
  • Compared oxidation parameters between hypothyroid, hyperthyroid, and euthyroid states, including post-treatment euthyroid states.

    • Main Results:

    • The lag phase of LDL oxidation was significantly shorter in hypothyroid (4 h) and hyperthyroid (6 h) states compared to euthyroid states (14 h and 12 h, respectively).
    • Total and LDL cholesterol levels were elevated in hypothyroidism and reduced in hyperthyroidism relative to euthyroid states.
    • Restoring euthyroid states significantly increased the lag phase of LDL oxidation, indicating reduced susceptibility.

    Conclusions:

    • LDL exhibits increased susceptibility to oxidation in both hypothyroid and hyperthyroid conditions.
    • Enhanced LDL oxidation may contribute to the pathogenesis of cardiac disease in thyroid dysfunction.
    • Therapeutic normalization of thyroid hormone levels (euthyroid state) mitigates the increased susceptibility of LDL to oxidation.