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Gonadorelin Research Standard
Gonadorelin (CAS 33515-09-2) is gonadotropin-releasing hormone, the native hypothalamic decapeptide, supplied as a 2 mg lyophilized powder in a 3 mL vial. It is the unmodified endogenous sequence rather than an engineered analogue, which makes it the reference arm when characterising GnRH analogues.
Mechanism of Action & Research Context
The molecular target is the GnRH receptor on pituitary gonadotrophs — a minority cell population making up only 5–10% of pituitary cells.[1]
Pulsatility is part of the signal. GnRH is synthesised and secreted from the hypothalamus in a pulsatile manner. Continuous exposure and pulsatile exposure are not interchangeable at this receptor, which is the single most important design consideration when working with it.[1]
A branched signalling cascade. GnRH receptor activation drives phosphoinositide turnover, phospholipase D and phospholipase A2 activation, mobilisation and influx of Ca2+, and activation of protein kinase C and MAPK. Crosstalk between these messengers mediates the receptor’s diverse outputs, so a single readout captures only part of the response.[1]
A heterogeneous target population. Gonadotrophs are not uniform: roughly 60% are multihormonal (LH and FSH), about 18% contain LH only and about 22% FSH only. Population-level assays average across three cell types.[1]
Feedback is layered on top. Gonadal steroids and gonadal peptides exert positive and negative feedback that modifies GnRH action, so an isolated preparation and an intact axis give different answers.[1]
Upstream context. GnRH neurons receive an obligatory kisspeptin input via KISS1R, and they reach the hypothalamus by migrating from the olfactory placode during development.[2,3]
Research Applications
Primary fields of in vitro and preclinical laboratory investigation include:
Gonadotropin release assays in pituitary cell culture, with pulsatile and continuous exposure compared directly.[1]
Second-messenger profiling across phosphoinositide turnover, Ca2+ flux, PKC and MAPK.[1]
Gonadotropin subunit gene expression.[1]
Comparative pharmacology as the native reference against engineered GnRH analogues.[1]
Axis-level studies pairing GnRH with upstream kisspeptin manipulation.[2]
Analytical Documentation
Purity and identity vary by manufacturing lot. Kimera Chems does not publish a single fixed purity figure for this item; refer to the batch-specific Certificate of Analysis (COA) issued for the lot received, which reflects third-party analytical testing for that lot.
References
- Shacham S, Harris D, Ben-Shlomo H, et al. Mechanism of GnRH receptor signaling on gonadotropin release and gene expression in pituitary gonadotrophs. Vitam Horm. 2001;63:63–90. doi:10.1016/s0083-6729(01)63003-6
- Roseweir AK, Millar RP. Kisspeptin antagonists. Adv Exp Med Biol. 2013;784:159–186. doi:10.1007/978-1-4614-6199-9_8
- Schwarting GA, Wierman ME, Tobet SA. Gonadotropin-releasing hormone neuronal migration. Semin Reprod Med. 2007;25(5):305–312. doi:10.1055/s-2007-984736
Storage & Handling
Store at controlled room temperature, sealed and protected from light.
Storage guidance is a house recommendation. Analytical documentation is per-lot release testing.
