Gonadorelin (gonadotropin-releasing hormone; GnRH) is a decapeptide synthesized in hypothalamic neurons of the arcuate and preoptic nuclei and released in coordinated pulses into the hypophyseal portal circulation. As a synthetic sequence-identical analog, Gonadorelin acts directly on GnRH receptors (GnRHR) — Gq-protein-coupled GPCRs — expressed on pituitary gonadotroph cells. Upon GnRHR binding, Gonadorelin activates phospholipase C (PLC), generating IP3 and DAG second messengers that mobilize intracellular calcium from the endoplasmic reticulum and activate protein kinase C (PKC). The resulting calcium transient drives exocytosis of LH and FSH from gonadotroph secretory granules. GnRH pulse frequency and amplitude strongly determine the LH:FSH ratio released — a pulse-frequency encoding mechanism that Gonadorelin allows researchers to dissect under controlled experimental conditions. Because Gonadorelin is sequence-identical to endogenous GnRH (unlike modified analogs such as Tript
Gonadorelin: Synthetic GnRH Research Guide
Gonadorelin is a synthetic decapeptide identical in sequence to endogenous GnRH. Researchers use it to directly activate pituitary GnRH receptors (GnRHR) and study LH/FSH secretion dynamics in the HPG axis.