Circulating levels of irisin is elevated in hypothyroidism, a case-control study.

Area of Science:

• Endocrinology
• Metabolism
• Thyroidology

Background:

• Irisin hormone influences adipose tissue and metabolism, similar to thyroid hormones.
• Thyroid dysfunction, particularly hypothyroidism, is associated with metabolic changes and obesity.
• Understanding the relationship between irisin and thyroid function is crucial for metabolic health.

Purpose of the Study:

• To investigate the association between irisin hormone levels and thyroid function in patients with hypothyroidism.
• To explore the role of irisin in obesity secondary to thyroid disease.
• To identify irisin as a potential biomarker for hypothyroidism.

Main Methods:

• Cross-sectional study comparing 37 newly diagnosed hypothyroid patients (Hashimoto's thyroiditis) with 37 healthy controls.
• Measurement of serum irisin, TSH, fT4, anti-thyroglobulin, and anti-thyroid peroxidase.
• Thyroid ultrasonography and multivariable logistic regression analysis.

Main Results:

• Hypothyroid patients exhibited significantly higher serum irisin levels compared to controls (p=0.017).
• Elevated irisin levels were observed in obese hypothyroid patients versus obese controls (p=0.013).
• Irisin levels correlated positively with TSH (r=0.247, p=0.034) and negatively with fT4 (r=-0.316, p=0.006).

Conclusions:

• Irisin levels are elevated in hypothyroidism and correlate with thyroid function markers.
• Obesity, fT4, and irisin levels are identified as independent predictors for hypothyroidism diagnosis.
• This study highlights irisin as a potential novel biomarker for hypothyroidism.