Kisspeptin went from an obscure gene product to one of the most studied neuropeptides in endocrinology in under a decade. The KISS1 gene was first identified in 1996 in cancer cell research, and in 2003 its receptor was linked to the hypothalamic-pituitary-gonadal (HPG) axis. Today kisspeptin peptides are standard tools for studying receptor signaling upstream of GnRH neurons. This overview covers the peptide family, its receptor, and lab sourcing checks.
What Is Kisspeptin?
Kisspeptins are a family of peptides cleaved from a 145-amino-acid precursor encoded by the KISS1 gene. The major forms are Kisspeptin-54 (originally called metastin), Kisspeptin-14, Kisspeptin-13 and Kisspeptin-10. All share the same C-terminal decapeptide, which carries an RF-amide motif and is sufficient for receptor binding. That shared fragment, Kisspeptin-10 (Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH2), is the form most used in research.
The KISS1 Receptor (GPR54)
Kisspeptins bind KISS1R, also known as GPR54, a Gq-coupled G-protein-coupled receptor. In cell models, receptor activation triggers phospholipase C, intracellular calcium mobilization, and ERK signaling. Published preclinical research places KISS1R on GnRH neurons in the hypothalamus, which is why kisspeptin is considered a key upstream regulator of the HPG axis in signaling models.
Its original name, metastin, reflects early in-vitro findings related to cell migration in cancer cell lines, a separate research line that continues today.
Common Laboratory Research Themes
- GPCR signaling assays: calcium flux and ERK phosphorylation in KISS1R-expressing cell lines.
- Neuroendocrine circuit mapping: GnRH neuron signaling in preclinical models.
- Structure-activity studies: comparing Kisspeptin-10 with longer isoforms and synthetic analogs.
- Cell migration research: continuing the metastin line of in-vitro work.
These are in-vitro and preclinical research applications; they do not indicate any effect in people.
Designing Kisspeptin Experiments
Labs working with kisspeptin usually start by deciding which isoform fits the question. Kisspeptin-10 is short, inexpensive to synthesize and easy to verify, which makes it the default for receptor-activation assays. Longer isoforms such as Kisspeptin-54 are studied when researchers want to examine how the extended N-terminal region affects stability or receptor interaction. Many protocols also include a receptor antagonist or a KISS1R-negative cell line as a control, so that any signal can be attributed specifically to KISS1R activation rather than off-target effects.
Good record keeping matters as much as the reagent: logging the lot number, the COA reference and the preparation date for each experiment makes results traceable and reproducible across studies.
Kisspeptin Specifications at a Glance
- Class: RF-amide neuropeptide
- Common research form: Kisspeptin-10, C-terminal amide
- Target: KISS1R (GPR54)
- Form: lyophilized powder
- Size: 10mg vial
- Verification: HPLC purity and MS identity, third-party tested
Quality Documentation
Because several isoforms exist, the COA should state which kisspeptin form is supplied and its molecular weight; MS confirms the C-terminal amidation, which is essential for receptor activity. See reading a spec sheet and acetate vs TFA salt forms. Genetic Peptides USA lots are PepAssure third-party verified.
Storage and Stability
Lyophilized kisspeptin should be stored cold, dry and away from light; tryptophan residues are prone to oxidation. See peptide stability data for how stability is assessed.
Where to Go Next
View the Kisspeptin 10mg research peptide page or the Reproductive Research collection. Related: Ipamorelin overview and what Research Use Only means.
Frequently Asked Questions
What gene encodes kisspeptin?
Kisspeptins are cleaved from a 145-amino-acid precursor encoded by the KISS1 gene.
What is Kisspeptin-10?
It is the shared C-terminal decapeptide of all kisspeptin isoforms, with an RF-amide motif sufficient for receptor binding.
What receptor does kisspeptin bind?
KISS1R, also called GPR54, a Gq-coupled GPCR that signals through calcium mobilization and ERK in cell models.
Why was kisspeptin called metastin?
Early in-vitro studies linked KISS1 products to cell migration in cancer cell lines, which inspired the name.
Is kisspeptin for human use?
No. It is sold for laboratory research use only, not for human or veterinary use, and is not intended to diagnose, treat, cure, or prevent any disease.
All products referenced in this article are sold strictly for laboratory research use only. They are not for human or veterinary use, are not drugs, foods, or cosmetics, and are not intended to diagnose, treat, cure, or prevent any disease. Nothing here is guidance on administration or handling outside a qualified laboratory setting.