Kisspeptins and GnRH neuronal signalling.
Colledge. William H WH
Key Findings
- Kisspeptin binds to the KISS1R (GPR54) receptor on GnRH neurons, triggering GnRH release.
- The peptide inhibits inwardly rectifying potassium channels and activates non‑specific cation channels, causing long‑lasting depolarization and higher firing rates of GnRH neurons.
- Kisspeptin neurons contact GnRH neurons both at the cell body and nerve terminals, allowing direct and indirect regulation of the reproductive axis.
Practical Outcomes
- For biohackers, the main takeaway is that kisspeptin can boost the brain's reproductive hormone signaling, which could influence sex hormone levels like testosterone or estrogen. However, the review does not provide dosing guidelines, safety data, or specific protocols, so any experimentation would be exploratory and should be approached with caution.
Summary
Kisspeptin is a small protein that talks to the brain cells that control reproductive hormones. When it binds to its receptor on GnRH neurons, it makes those cells fire more, releasing more GnRH and turning on the whole reproductive hormone system. The review explains how this signaling works at the cellular level across different animals.
Abstract
Kisspeptin binding to its G-protein-coupled receptor KISS1R (also known as GPR54), which is expressed by gonadotropin-releasing hormone (GnRH) neurons, stimulates GnRH release and activation of the mammalian reproductive axis. Kisspeptin neurons make close contact with GnRH neurons acting at both the cell body and the nerve terminals. Kisspeptin can act directly on GnRH neurons and/or indirectly via synaptic input from other neurons to inhibit inwardly rectifying potassium channels and activate non-specific cation channels, with the effect of long-lasting depolarization and increased action potential firing rate. This review covers the recent advances in the molecular consequences of kisspeptin action on GnRH neurons and how these neuronal circuits are integrated in different species. These studies provide insight into the mechanism by which kisspeptin regulates the reproductive axis.
Study Information
pubmed
2008
2008-12-25T00:00:00.000Z
10.1016/j.tem.2008.10.005
120
63