Kisspeptin 10 Research
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Kisspeptin-10: GPR54 Receptor Pharmacology and HPG Axis Research
Kisspeptin-10 is a synthetic decapeptide derived from the C-terminal active fragment of kisspeptin (the protein product of the KISS1 gene). It is studied in laboratory settings for its role in GPR54 receptor pharmacology, hypothalamic-pituitary-gonadal (HPG) axis signalling, and reproductive neuroendocrinology research.
Chemical and Molecular Data
| Property | Value |
|---|---|
| Molecular formula | C63H83N15O12 |
| Molecular weight | 1302.45 g/mol |
| CAS number | 374675-21-5 |
| Sequence | Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH2 |
| Amino acid count | 10 |
| Parent protein | Kisspeptin (KISS1 gene product, 145 amino acids) |
| Active fragment | C-terminal RF-amide motif essential for GPR54 binding |
| Purity | greater than or equal to 98% as verified by HPLC |
| Form | Lyophilised powder |
| Storage | -20 degrees C, protected from light and moisture |
| Reconstitution | Bacteriostatic water recommended |
Kisspeptin-10: GPR54 and HPG Axis Signalling
KISS1 Gene and Kisspeptin Biology
The KISS1 gene was originally identified as a metastasis suppressor in melanoma, but its primary physiological role — discovered in 2003 — is as a critical regulator of the HPG axis. Loss-of-function mutations in KISS1 or its receptor GPR54 (KISS1R) cause hypogonadotropic hypogonadism in both mice and humans, establishing kisspeptin signalling as an essential gatekeeper of reproductive function.
The kisspeptin precursor protein (145 amino acids) is processed to several biologically active fragments: kisspeptin-54, kisspeptin-14, kisspeptin-13, and kisspeptin-10. All active fragments share the C-terminal RF-amide sequence (Arg-Phe-NH2) that is required for GPR54 binding, making kisspeptin-10 the minimal active fragment and the most commonly used research tool.
GPR54 Receptor Research
GPR54 (also called KISS1R) is a Gq/11-coupled GPCR that activates phospholipase C, IP3-mediated calcium release, and PKC. Laboratory research has examined GPR54 binding kinetics, receptor internalisation and desensitisation, and downstream signalling in hypothalamic cell models.
Kisspeptin-10 is used in competitive binding assays with radiolabelled ligands to characterise GPR54 pharmacology and in functional assays measuring IP3 production and intracellular calcium mobilisation.
HPG Axis and GnRH Pulse Research
The central research significance of kisspeptin-10 lies in its potent ability to trigger GnRH (gonadotropin-releasing hormone) secretion from hypothalamic neurons. Kisspeptin neurons in the hypothalamus, particularly in the arcuate nucleus (KNDy neurons co-expressing kisspeptin, NKB, and dynorphin), play a critical role in generating the pulsatile GnRH secretion pattern that drives pituitary LH and FSH secretion.
Laboratory research has used kisspeptin-10 to study GnRH pulse generator dynamics, the feedback control of kisspeptin neurons by gonadal steroids, and the integration of metabolic status with reproductive function through kisspeptin signalling.
Kisspeptin Fragment Comparison
| Fragment | Length | Residues | GPR54 activity | Research use |
|---|---|---|---|---|
| Kisspeptin-54 | 54aa | Full processed form | Full agonist | In vivo studies |
| Kisspeptin-14 | 14aa | C-terminal 14 | Full agonist | Binding assays |
| Kisspeptin-13 | 13aa | C-terminal 13 | Full agonist | Comparative pharmacology |
| Kisspeptin-10 | 10aa | C-terminal 10 | Full agonist | Primary research tool |
HPG Axis: Neuroendocrine Hierarchy
Kisspeptin-10's role in research sits at the apex of the hypothalamic-pituitary-gonadal (HPG) axis:
Hypothalamus (KNDy neurons): Kisspeptin neurons in the arcuate nucleus co-express kisspeptin, neurokinin B (NKB), and dynorphin — hence the name KNDy neurons. These neurons act as the GnRH pulse generator. NKB drives kisspeptin release (auto-stimulation), dynorphin suppresses it (auto-inhibition), and the interplay generates pulsatile kisspeptin output that drives pulsatile GnRH secretion.
Pituitary: GnRH pulses from the hypothalamus drive pulsatile LH and FSH release from gonadotrophs.
Gonads: LH stimulates testosterone/oestradiol synthesis; FSH drives spermatogenesis/folliculogenesis.
Feedback: Gonadal steroids feed back to hypothalamic kisspeptin neurons — oestradiol at low levels stimulates kisspeptin (positive feedback at the LH surge), while high oestradiol and testosterone inhibit kisspeptin (negative feedback for tonic suppression).
Frequently Asked Questions
Why is the RF-amide C-terminus critical for Kisspeptin-10 activity?
All active kisspeptin fragments share the C-terminal Arg-Phe-NH2 (RF-amide) motif. This is the GPR54 receptor recognition pharmacophore. Removal or modification of the Arg-Phe-NH2 sequence dramatically reduces GPR54 binding affinity. The RF-amide motif is characteristic of a broader family of neuropeptides called RFamides, which include neuropeptide FF, QRFP, and others — all characterised by the C-terminal Arg-Phe-amide sequence and, in several cases, activity at overlapping receptor families.
What distinguishes Kisspeptin-10 from full-length Kisspeptin-54 as a research tool?
Kisspeptin-54 is the primary processed form in circulation and has a longer plasma half-life than shorter fragments. For research applications requiring precise pharmacological control, Kisspeptin-10 is often preferred: it is easier to synthesise at high purity, more cost-effective, and has been used in the majority of published mechanistic receptor pharmacology studies. Both fragments activate GPR54 with equivalent potency in binding assays, as the additional N-terminal residues of Kisspeptin-54 do not contact the receptor binding pocket.
Published Research References
For laboratory and analytical research purposes only. Not for human or veterinary use. No dosage or administration guidance is provided or implied.
Related research peptides: Semax | KPV | Ipamorelin