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Lipoprotein (a) in thyroid dysfunction before and after treatment

S Spandrio1, I Sleiman, T Scalvini

  • 1Clinica Medica, Università di Brescia, Italy.

Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|November 1, 1993
PubMed
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Thyroid hormones significantly impact lipid profiles, but have a minor effect on Lipoprotein (a) [Lp(a)] levels. Studies show Lp(a) concentrations are minimally affected by hypothyroidism and hyperthyroidism treatments.

Area of Science:

  • Endocrinology
  • Lipid Metabolism
  • Cardiovascular Research

Background:

  • Thyroid hormones are crucial regulators of lipid metabolism, primarily via the LDL receptor pathway.
  • The specific influence of thyroid dysfunction on Lipoprotein (a) [Lp(a)] metabolism remains largely uncharacterized.

Purpose of the Study:

  • To investigate the impact of thyroid dysfunction and its treatment on Lipoprotein (a) [Lp(a)] concentrations.
  • To elucidate the relationship between thyroid hormones and Lp(a) metabolism, particularly in relation to the LDL receptor pathway.

Main Methods:

  • Studied Lp(a) concentrations in hypothyroid patients (n=29) post-thyroidectomy and hyperthyroid patients (n=14) with Graves' disease.
  • Measured lipid profiles, including total cholesterol, LDL-C, HDL-C, and triglycerides, before and after normalizing thyroid function through treatment (T4 for hypothyroidism, methimazole for hyperthyroidism).

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Main Results:

  • Hypothyroid patients showed significant decreases in total cholesterol, LDL-C, HDL-C, and triglycerides after T4 treatment (p < 0.001).
  • Hyperthyroid patients exhibited significant increases in total cholesterol, LDL-C, and HDL-C after methimazole treatment (p < 0.001 for total/LDL-C, p < 0.01 for HDL-C).
  • Lp(a) levels demonstrated minor, non-significant variations in hypothyroid patients (p: N.S.) and a slight, significant increase in hyperthyroid patients (p < 0.05).

Conclusions:

  • Thyroid hormone influence on Lp(a) metabolism appears to be of minor significance.
  • The LDL receptor pathway is unlikely to be the primary mechanism through which thyroid hormones affect Lp(a) levels.