What Is Kisspeptin? KISS1, KISS1R/GPR54 & the HPG Axis

Kisspeptin is a neuropeptide encoded by the KISS1 gene that acts on the KISS1R (GPR54) receptor and is a key upstream regulator of gonadotropin-releasing hormone (GnRH) release within the reproductive (hypothalamic–pituitary–gonadal, or HPG) axis. Kisspeptin-10 is a commonly studied active 10–amino-acid C-terminal fragment of the parent peptide.

This article is educational only. Kisspeptin and kisspeptin-10 are discussed strictly in the context of laboratory and physiological research. Any research material referenced would be intended for research use only (RUO) and is not a drug, supplement, or treatment.

Quick facts

• Class: neuropeptide (RFamide-related peptide family)
• Gene: KISS1
• Receptor: KISS1R (formerly GPR54)
• Research focus: reproductive neuroendocrinology — the HPG axis and upstream control of GnRH
• Commonly studied fragment: kisspeptin-10

What is kisspeptin?

Kisspeptin refers to a family of peptides produced from a precursor protein encoded by the KISS1 gene on chromosome 1q32. The precursor is cleaved into several C-terminally amidated fragments, including kisspeptin-54, kisspeptin-14, kisspeptin-13, and kisspeptin-10. These peptides share a common C-terminal region and belong to the RFamide peptide family. KISS1 was first identified as a metastasis-suppressor gene, and the broader kisspeptin system has since been studied across reproduction, oncology, and cardiovascular biology.

What does the research show?

In published research, kisspeptin is described as acting upstream of GnRH and signaling directly to GnRH neurons to influence pulsatile GnRH release, positioning it as a central regulator of the HPG axis (Skorupskaite, George & Anderson, 2014). The obligate role of kisspeptin–KISS1R signaling was supported when inactivating mutations in the receptor were linked to impaired pubertal development in the genetics literature. Experimental work with the kisspeptin-10 fragment has examined its effects on the axis: in one controlled study in healthy men, intravenous kisspeptin-10 was reported to stimulate luteinizing hormone (LH) secretion and increase LH pulse frequency, consistent with kisspeptin acting on the GnRH neurons that drive gonadotropin release (George et al., 2011). These descriptions reflect physiology and laboratory research, not outcomes for any individual.

Mechanisms studied in the lab

• KISS1R/GPR54 signaling: kisspeptin binds KISS1R, a G-protein-coupled receptor that activates phospholipase C and downstream intracellular messengers.
• GnRH neuron stimulation: activated signaling is studied for its role in modulating the pulsatile release of GnRH from hypothalamic neurons.
• Upstream axis control: by sitting upstream of GnRH, the kisspeptin system is investigated as an integrator of inputs to the HPG axis.

Research status

Kisspeptin and the kisspeptin-10 fragment are subjects of ongoing neuroendocrine research. Any kisspeptin-related material described in a research context is intended for research use only (RUO). It is not approved by the FDA, is not a dietary supplement, and is not intended to diagnose, treat, cure, or prevent any condition or to be administered to humans or animals. Bolt Peptide does not currently sell kisspeptin; this article is provided for topical and educational reference.

Related research peptides

Browse the full research peptide catalog for compounds currently offered. For related educational reading on peptides studied in neuroendocrine and reproductive-axis contexts, see our overviews of PT-141 and Sermorelin.

FAQ

Is kisspeptin the same as kisspeptin-10? No. Kisspeptin is the family of peptides produced from the KISS1 gene. Kisspeptin-10 is a shorter 10-amino-acid C-terminal fragment that retains receptor activity and is commonly used in research.

What receptor does kisspeptin act on? Kisspeptin signals through KISS1R, the receptor formerly known as GPR54.

Does Bolt Peptide sell kisspeptin? Not at this time. This page is educational. See the catalog for compounds currently available, all intended for research use only.

References

1. Skorupskaite K, George JT, Anderson RA. The kisspeptin-GnRH pathway in human reproductive health and disease. Hum Reprod Update. 2014.
2. George JT, et al. Kisspeptin-10 is a potent stimulator of LH and increases pulse frequency in men. J Clin Endocrinol Metab. 2011.
3. Mead EJ, et al. Kisspeptins: a multifunctional peptide system. Br J Pharmacol. 2007.

For research use only. Not for human or veterinary use; not FDA-approved. Statements have not been evaluated by the FDA.