TRH
Function
As a component of the hypothalamic-pituitary-thyroid axis, it controls the secretion of thyroid-stimulating hormone (TSH) and is involved in thyroid hormone synthesis regulation. It also operates as modulator of hair growth. It promotes hair-shaft elongation, prolongs the hair cycle growth phase (anagen) and antagonizes its termination (catagen) by TGFB2. It stimulates proliferation and inhibits apoptosis of hair matrix keratinocytes.
Sequence Similarities
Belongs to the TRH family.
Tissue Specificity
Hypothalamus. Expressed in the hair follicle epithelium (at protein level).
Cellular localization
- Secreted
Alternative names
Pro-thyrotropin-releasing hormone, Pro-TRH, Prothyroliberin, TRH