Research Overview
Where kisspeptin sits in the axis
Kisspeptin neurons in the arcuate nucleus and the anteroventral periventricular region act as the principal upstream regulator of GnRH neurons. Arcuate kisspeptin neurons, which co-express neurokinin B and dynorphin, are widely modelled as the GnRH pulse generator, while the rostral population is associated with the preovulatory surge in rodents. Kisspeptin-10 retains full KISS1R activity in this system despite being only the C-terminal fragment of the 54-residue parent.
What the literature examines
- LH and FSH response profiles following KISS1R activation in animal and human physiology studies
- Genetic models of KISS1R loss of function and delayed or absent puberty
- Metabolic and energy-balance inputs onto kisspeptin neurons, including leptin signalling
- The KISS1 gene's original identification as a metastasis suppressor, which gave the family the name metastin
- Structure-activity work showing that the terminal Arg-Phe-amide is indispensable to receptor binding
Why delivery is the limiting variable
Kisspeptin-10 is cleared quickly — reported plasma half-lives are in the low tens of minutes — and is degraded by peptidases at both termini, with matrix metalloproteinases implicated in cleavage of the parent peptide. Gastric administration is not viable, so route research concentrates on parenteral, intranasal and transmucosal formats. A sublingual troche tests whether a thin, well-perfused epithelium can deliver enough intact peptide to produce a measurable endocrine readout.
Formulation endpoints
Comparative design
Because the same peptide is offered as powder, nasal solution and troche, the route can be varied while holding the molecule and lot constant. That matched design is what allows an observed difference to be attributed to delivery rather than to the material itself.
