Thyroid function influences serum apolipoprotein B-48 levels in patients with thyroid disease

Area of Science:

• Endocrinology
• Cardiovascular Medicine
• Lipid Metabolism

Background:

• Apolipoprotein B-48 (apoB-48) is a key component of chylomicrons and remnants.
• Hypothyroidism is linked to accelerated coronary atherosclerosis.
• The role of apoB-48 in thyroid disease requires further clarification.

Purpose of the Study:

• To investigate the relationship between serum apoB-48 levels and thyroid hormone status.
• To assess the clinical significance of apoB-48 measurement in patients with thyroid disease.

Main Methods:

• Serum apoB-48, TSH, FT4, and FT3 levels were measured in patients with overt hypothyroidism (OH), subclinical hypothyroidism (SH), and healthy controls.
• Chemiluminescence enzyme immunoassay was used for apoB-48 measurement.
• Correlations with thyroid hormones and lipid profiles were analyzed.

Main Results:

• Serum apoB-48 levels positively correlated with TSH and negatively with FT4 and FT3.
• Patients with OH exhibited significantly higher apoB-48 levels compared to hyperthyroid and normal subjects.
• Serum apoB-48 levels decreased after levothyroxine replacement therapy.

Conclusions:

• Elevated serum apoB-48 concentrations in hypothyroidism may contribute to increased atherosclerosis risk.
• Serum apoB-48 levels are dependent on thyroid function status.
• Increased chylomicron remnants (CMR) in hypothyroidism may play a role in premature coronary artery disease.