Kisspeptin Signaling and Gonadotropin Regulation in Reproductive Systems

Kisspeptin, a neuropeptide encoded by the KiSS1 gene, serves as a master regulator of the hypothalamic–pituitary–gonadal (HPG) axis by stimulating the release of gonadotropin-releasing hormone (GnRH). GnRH in turn orchestrates the synthesis and pulsatile secretion of the gonadotropins follicle-stimulating hormone (FSH) and luteinising hormone (LH) from the anterior pituitary. This cascade underpins pubertal onset, gametogenesis, steroidogenesis and ovulation. Refinement of this system is achieved by inhibitory signals, notably gonadotropin-inhibitory hormone (GnIH), which counterbalances kisspeptin to modulate pulse frequency and amplitude. Emerging evidence highlights epigenetic and metabolic inputs that adjust KiSS1 expression in response to nutritional state, while distinct arcuate and pre-optic kisspeptin neuronal populations integrate internal and external cues. Understanding these pathways offers routes to novel interventions for infertility, amenorrhoea, delayed puberty and metabolic disorders affecting reproductive health.

Research from Nature Portfolio

Studies have uncovered unexpected roles for pituitary-derived gonadotropins beyond the gonads. Work published last year demonstrated that FSH engages in intra-pituitary paracrine communication to restrain corticosterone production by corticotropes, thereby protecting the liver from steatosis independently of ovarian steroids. This finding redefines FSH as a multi-organ messenger and opens new avenues for treating metabolic complications of menopause and hypogonadism. In parallel, investigation of epigenetic control has identified Sirtuin 1 (SIRT1) as a key deacetylase in hypothalamic kisspeptin neurons. SIRT1 binds the Kiss1 promoter to repress its transcription under conditions of undernutrition, delaying puberty, while eviction of SIRT1 under states of excess energy accelerates Kiss1 expression. These insights link metabolic status directly to chromatin remodelling in reproductive neuroendocrine circuits.

Kisspeptin Signaling and Gonadotropin Regulation in Reproductive Systems publication trend

The graph below shows the total number of articles in kisspeptin signaling and gonadotropin regulation in reproductive systems across all publications each year (not limited to Nature Index journals).

Technical terms

Kisspeptin: A family of neuropeptides that activate the G protein-coupled receptor KISS1R to stimulate GnRH secretion.

Gonadotropin-releasing hormone (GnRH): Hypothalamic decapeptide that governs the synthesis and pulsatile release of FSH and LH from the pituitary.

Gonadotropins: Peptide hormones (FSH and LH) released by the anterior pituitary to regulate gonadal function, gametogenesis and steroidogenesis.

Gonadotropin-inhibitory hormone (GnIH): Neuropeptide that directly inhibits GnRH neuron activity and pituitary gonadotropin release to fine-tune reproductive output.

Hypothalamic–pituitary–gonadal (HPG) axis: The integrated neuroendocrine circuit linking the hypothalamus, pituitary gland and gonads to control fertility and reproductive homeostasis.

References

1. The Metastasis Suppressor Gene KiSS-1 Encodes Kisspeptins, the Natural Ligands of the Orphan G Protein-coupled Receptor GPR54*. Journal of Biological Chemistry (2001).
2. Identification of Human GnIH Homologs, RFRP-1 and RFRP-3, and the Cognate Receptor, GPR147 in the Human Hypothalamic Pituitary Axis. PLOS ONE (2009).
3. SIRT1 mediates obesity- and nutrient-dependent perturbation of pubertal timing by epigenetically controlling Kiss1 expression. Nature Communications (2018).
4. Visualisation of Kiss1 Neurone Distribution Using a Kiss1‐CRE Transgenic Mouse. Journal of Neuroendocrinology (2016).
5. Intra-pituitary follicle-stimulating hormone signaling regulates hepatic lipid metabolism in mice. Nature Communications (2023).
6. Kisspeptin/Kisspeptin Receptor System in the Ovary. Frontiers in Endocrinology (2018).
7. High-frequency stimulation-induced peptide release synchronizes arcuate kisspeptin neurons and excites GnRH neurons. eLife (2016).
8. Increasing LH Pulsatility in Women With Hypothalamic Amenorrhoea Using Intravenous Infusion of Kisspeptin-54. The Journal of Clinical Endocrinology & Metabolism (2014).