What Is Kisspeptin?
Kisspeptin is a neuropeptide encoded by the KISS1 gene, first identified in the context of metastasis suppression research before its critical role in reproductive neuroendocrinology was established. It exists in multiple bioactive forms — including kisspeptin-54, kisspeptin-14, kisspeptin-13, and kisspeptin-10 — all derived from the same precursor protein through proteolytic cleavage. In research settings, kisspeptin-10 is among the most studied fragments due to its potency at the KISS1 receptor (GPR54/KISS1R). TrueCanPeptides offers kisspeptin-10mg for verified laboratory research applications.
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Mechanism of Action
Kisspeptin exerts its signalling effects through the KISS1 receptor (KISS1R), a G-protein–coupled receptor expressed prominently in hypothalamic GnRH (gonadotropin-releasing hormone) neurons. Binding of kisspeptin to KISS1R triggers a Gαq/11-mediated signalling cascade, leading to activation of phospholipase C, increased intracellular calcium, and downstream stimulation of GnRH secretion.
This GnRH pulse generation is a key area of neuroendocrine research. Kisspeptin neurons in the arcuate nucleus co-express neurokinin B and dynorphin — collectively termed KNDy neurons — and have been investigated as central pacemakers of the GnRH pulse generator in preclinical models.
Kisspeptin signalling has also been investigated in relation to the seasonal regulation of reproduction in animal models, providing insights into photoperiod-sensitive reproductive biology.
Research Applications
Kisspeptin has been studied across a range of preclinical and early clinical research contexts. Key research areas include:
- Reproductive endocrinology: Investigated for its role in the neuroendocrine regulation of the hypothalamic-pituitary-gonadal (HPG) axis, including puberty onset and ovulation timing in animal models.
- GnRH axis modulation: Studied in rodent and primate models for its capacity to stimulate pulsatile LH (luteinising hormone) and FSH (follicle-stimulating hormone) release via GnRH activation.
- KISS1R biology: Used in in vitro systems to characterise KISS1R signalling cascades, receptor desensitisation, and downstream intracellular pathways.
- Kisspeptin-54 research: The longer kisspeptin-54 isoform has been explored in early-phase human studies under institutional protocols examining endocrine responses.
- Cancer biology: KISS1 was originally identified as a metastasis suppressor gene; research continues to investigate its expression patterns in various tumour models.
All applications referenced above are investigational. Browse the TrueCanPeptides Research Hub →
Storage & Handling
For optimal research integrity, kisspeptin should be stored lyophilised (freeze-dried) at −20°C or below. Reconstitution is typically performed using sterile bacteriostatic water or a suitable buffer for the specific assay. Reconstituted solutions should be aliquoted to avoid freeze-thaw cycles and stored at −80°C for extended use. Avoid repeated freeze-thaw cycles, exposure to direct light, and high-humidity environments.
Refer to the TrueCanPeptides Peptide Storage Guide for detailed handling protocols. See also our quality and purity standards.
Related Research
Kisspeptin research intersects with several related compound categories investigated at TrueCanPeptides. Researchers studying hypothalamic peptide signalling may also reference:
- VIP (Vasoactive Intestinal Peptide) — another neuropeptide with neuroimmune and neuroendocrine research applications
- Thymalin — thymic peptide preparation studied in immune biology research
Disclaimer: This content is intended for educational and research purposes only. The compounds discussed on this page are not approved for human therapeutic use by Health Canada or any other regulatory authority. They are not intended to diagnose, treat, cure, or prevent any disease or medical condition. TrueCanPeptides supplies research compounds strictly for in vitro and laboratory research use. All information presented is derived from published preclinical and early-phase research literature and does not constitute medical advice. Consult a qualified healthcare professional before making any health-related decisions.
See also: What is PT-141?
Kisspeptin and the HPG Axis
Kisspeptin refers to a family of peptides encoded by the KISS1 gene — the same gene originally identified as a metastasis suppressor (hence the “KiSS” name, from “Knoxville In Situ Suppressor”). Its central role in reproductive endocrinology was discovered later, when KISS1R (GPR54) mutations were found to cause hypogonadotropic hypogonadism in humans and mice.
Kisspeptin is the primary activating input to GnRH (gonadotropin-releasing hormone) neurons in the hypothalamus. GnRH drives pulsatile LH and FSH secretion from the pituitary, which in turn regulate gonadal steroidogenesis and gametogenesis. Kisspeptin neurons (KNDy neurons — expressing kisspeptin, neurokinin B, and dynorphin) in the arcuate nucleus of the hypothalamus generate the pulse generator signal that coordinates the entire HPG (hypothalamic-pituitary-gonadal) axis.
Kisspeptin Forms and Chemistry
The KISS1 gene encodes a 145-amino acid precursor (prepro-kisspeptin) that is processed into several C-terminal amidated fragments, all of which end in the RF-amide motif required for KISS1R binding:
- Kisspeptin-54 (metastin): 54 AA — the primary circulating form; full biological activity
- Kisspeptin-14: 14 AA — C-terminal fragment; full KISS1R activity
- Kisspeptin-13: 13 AA — C-terminal fragment
- Kisspeptin-10: 10 AA — shortest active fragment; widely used in research due to size and stability
Kisspeptin-10 (YNWNSFGLRF-NH₂, MW ~1,302 Da) is the most commonly used research form due to its minimal size, ease of synthesis, and full KISS1R agonist activity.
Research Applications
- HPG axis research: Kisspeptin is used as a pharmacological tool to study GnRH pulse generator biology, LH pulsatility, and HPG axis sensitivity in research models
- Pubertal biology: KISS1R signalling is essential for puberty onset; research uses kisspeptin to probe the neural timing mechanisms of pubertal transition
- Fertility research: In clinical research settings, kisspeptin has been studied as a tool for controlled ovarian stimulation and as a trigger for final oocyte maturation in IVF research protocols
- Behaviour research: Kisspeptin neurons also project to limbic regions; some research has investigated kisspeptin’s effects on sexual attraction behaviour in rodent models
Storage and Handling
- Store lyophilized at −20°C; protect from moisture and light
- Reconstitute in sterile water or 0.1% BSA-containing PBS to prevent adsorption at low concentrations
- Post-reconstitution: freeze aliquots immediately at −80°C; avoid repeated freeze-thaw
Kisspeptin is supplied for qualified in vitro laboratory research purposes only. Not for human or animal administration. Not evaluated or approved by Health Canada.
Available: Kisspeptin from TrueCanPeptides | Cognitive & Neuro research compounds