Kisspeptin
Also known as: metastin, Kiss1 peptide, KISS1
Kisspeptin, also called metastin, is a peptide cut from the metastasis suppressor KiSS-1 protein. The human form recorded in protein databases spans 54 amino acids. It serves as the natural ligand for the receptor KISS1R, also known as GPR54. Research concentrates on its position at the head of the reproductive hormone axis.
Quick Reference
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Overview
Mammalian protein
Kisspeptins are proteins encoded by the KISS1 gene in humans. Kisspeptins are ligands of the G-protein coupled receptor, GPR54. Kiss1 was originally identified as a human metastasis suppressor gene that has the ability to suppress melanoma and breast cancer metastasis. Kisspeptin-GPR54 signaling has an important role in initiating secretion of gonadotropin-releasing hormone (GnRH) at puberty, the extent of which is an area of ongoing research. Gonadotropin-releasing hormone is released from the hypothalamus to act on the anterior pituitary triggering the release of luteinizing hormone (LH), and follicle stimulating hormone (FSH). These gonadotropic hormones lead to sexual maturation and gametogenesis. Disrupting GPR54 signaling can cause hypogonadotrophic hypogonadism in rodents and humans. The Kiss1 gene is located on chromosome 1. It is transcribed in the brain, adrenal gland, liver, gonads, and pancreas.
Mechanism of Action
Kisspeptin binds KISS1R on gonadotropin releasing hormone neurons and activates Gq signaling through phospholipase C. The pathway breaks down a membrane phospholipid, raises intracellular calcium, and alters potassium and cation channel activity so the neuron depolarizes. A separate route through beta arrestin switches on MAPK signaling and ERK phosphorylation, while receptor activity in other tissues connects to cell movement and bone resorption pathways.
Research History
Kisspeptin was first recorded through the KiSS-1 gene, identified for its association with metastasis suppression, and its peptide product received the name metastin. Later research linked the peptide and its receptor to control of gonadotropin releasing hormone release within the hypothalamus. That link carried kisspeptin into puberty and fertility research, including work on triggers of early puberty.
What Researchers Are Saying
Community Reports - Not Medical Advice
The following is aggregated from public forums, Reddit, and research communities. These are anecdotal reports from researchers only - not verified clinical data and not a recommendation of any kind.
Kisspeptin (also known as metastin, Kiss1 peptide) is studied within the sexual health and hormonal research community. GnRH-gating neuropeptide from the KISS1 gene studied in puberty onset, ovulation triggering, and fertility models.
Last updated October 28, 2026
Research status: active. Kisspeptin appears across sexual health and hormonal research forums and academic literature. Researchers note this compound falls in the sexual health category.
Last updated October 28, 2026
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