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Pituitary-thyroid axis, thyroid volume and leptin in healthy adults
J M Gómez1, F J Maravall, N Gómez
1Endocrinology and Radiology Services, Ciudad Sanitaria y Universitaria de Bellvitge, L'Hospitalet de Llobregat, Hormonal Laboratory, Hospital Clínic, Barcelona, Spain. jmgs@csub.scs.es
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|April 25, 2002
Summary
This study found no direct link between leptin levels and the pituitary-thyroid axis in healthy adults. However, leptin and thyroid volume correlate in females, likely due to shared regulation by body composition factors.
Area of Science:
- Endocrinology
- Thyroidology
- Metabolic Research
Background:
- Thyroid diseases often cause body weight and thermogenesis disturbances.
- Leptin plays a key role in regulating body weight, appetite, and thermogenesis.
- Previous research on leptin and thyroid function has yielded conflicting results due to complex interactions.
Purpose of the Study:
- To investigate the relationship between basal thyroid-stimulating hormone (TSH), ultrasonographic thyroid volume, and leptin concentrations.
- To examine these relationships in a healthy, euthyroid adult population from an iodine-sufficient area.
- To explore correlations with anthropometric and body composition variables.
Main Methods:
- Cross-sectional study of 268 randomly selected healthy adults.
- Measurements included basal TSH, thyroid autoantibodies, leptin levels, thyroid volume via ultrasound, anthropometry, and body composition.
- Participants were from L'Hospitalet de Llobregat, Barcelona, an area free of iodine deficiency.
Main Results:
- No significant correlation was found between leptin concentrations and basal TSH levels in either sex.
- A positive correlation was observed between leptin and thyroid volume in females (r = 0.181, p = 0.038).
- A negative correlation was found between basal TSH and thyroid volume in males (r = -0.271, p = 0.002).
Conclusions:
- No direct correlation exists between leptin levels and the pituitary-thyroid axis in this healthy control population.
- The observed correlation between leptin and thyroid volume in females is likely influenced by parallel regulation through anthropometric and body composition factors.
- These findings contribute to understanding the interplay between metabolic hormones and thyroid parameters in euthyroid individuals.