The metastasis suppressor gene KiSS-1 encodes kisspeptins, the natural ligands of the orphan G protein-coupled receptor GPR54.
Kotani. M M; Detheux. M M; Vandenbogaerde. A A; Communi. D D; Vanderwinden. J M JM; Le Poul. E E; Brézillon. S S; Tyldesley. R R; Suarez-Huerta. N N; Vandeput. F F; Blanpain. C C; Schiffmann. S N SN; Vassart. G G; Parmentier. M M
Key Findings
- Kisspeptins bind GPR54 with low‑nanomolar affinity and activate signaling pathways (PIP2 hydrolysis, Ca2+ rise, MAPK phosphorylation)
- Activation of GPR54 by kisspeptin inhibits cell proliferation in vitro
- GPR54 is highly expressed in placenta, pituitary, pancreas, and spinal cord, and kisspeptin administration raises oxytocin secretion in rats
Practical Outcomes
- Kisspeptin shows promise for modulating hormone release and may have anti‑cancer properties, but there’s no guidance on safe human doses or protocols. For biohackers, it’s mainly a research tool to explore endocrine effects rather than a ready‑to‑use supplement.
Summary
Scientists found that kisspeptin peptides from the placenta tightly bind a receptor called GPR54, turning on several cell signals and even slowing cell growth. The receptor is found in hormone‑producing organs, and giving kisspeptin to rats boosted oxytocin release, hinting it could affect endocrine function. However, the study is basic lab work with no human dosing or clear health protocols.
Abstract
Natural peptides displaying agonist activity on the orphan G protein-coupled receptor GPR54 were isolated from human placenta. These 54-, 14,- and 13-amino acid peptides, with a common RF-amide C terminus, derive from the product of KiSS-1, a metastasis suppressor gene for melanoma cells, and were therefore designated kisspeptins. They bound with low nanomolar affinities to rat and human GPR54 expressed in Chinese hamster ovary K1 cells and stimulated PIP(2) hydrolysis, Ca(2+) mobilization, arachidonic acid release, ERK1/2 and p38 MAP kinase phosphorylation, and stress fiber formation but inhibited cell proliferation. Human GPR54 was highly expressed in placenta, pituitary, pancreas, and spinal cord, suggesting a role in the regulation of endocrine function. Stimulation of oxytocin secretion after kisspeptin administration to rats confirmed this hypothesis.
Study Information
pubmed
2001
2001-07-16T00:00:00.000Z
10.1074/jbc.m104847200