• Thyroid hormone production is regulated by a series of negative feedback loops
  • Thyroid stimulating hormone (TSH) is an important regulator:
    • Peptide hormone produced in the anterior pituitary gland
    • Stimulates the production and release of thyroid hormones
    • TSH production is stimulated by:
      • TRH production
      • Low serum levels of thyroid hormones
    • TSH production is inhibited by:
      • High serum levels of thyroid hormones (negative feedback loop)
      • High serum levels of TSH (ultra-short negative feedback loop)
  • Thyrotropin-releasing hormone (TRH) is another important regulator:
    • Peptide hormone produce in the hypothalamus
    • Stimulates the production and release of TSH
    • TRH production is stimulated by:
      • Low serum levels of thyroid hormones
    • TRH production is inhibited by:
      • High serum levels of thyroid hormones (negative feedback loop)
Regulation of thyroid hormone release by the hypothalamus and pituitary glands