GnRH (Gonadotropin releasing hormone): It is a decapeptide causing release of gonadotropic hormones i.e. FSH & LH from anterior pituitary.
GHRF: (Growth hormone releasing factors):
There are two factors which contribute towards control of growth hormone secretion:
GHIF (Growth hormone inhibitory factor) - Tetradecapeptide and also found in gastro-intestinal tract. It inhibits growth hormone release from anterior pituitary.
GHRF (Growth hormone releasing factor) - It stimulates growth hormone release from anterior pituitary.
Sum total of GH secreted from hypophysis depends upon the balance of GHIF & GHRF. CRF/CRH: (Corticotrophin Releasing Factor/Hormone): Secreted from anterior hypothalamus and affects secretion of ACTH from anterior pituitary. PIF : (Prolactin Inhibitory Factor): It inhibits prolactin release from anterior pituitary. PRF : (Prolactin Releasing Factor): It stimulates prolactin release from anterior pituitary. The secretion of Prolactin from pituitary depends upon the net balance of these two however, but PIF is more important. TRH : (Thyrotropin releasing hormone): A tripeptide, stimulates release of thyrotropin hormone (TSH) from anterior pituitary.