kisspeptin
Pronunciation: KISS-pep-tin
A hypothalamic neuropeptide that stimulates GnRH release and is essential for puberty initiation and reproductive function.
Full Definition
Kisspeptin is a neuropeptide encoded by the KISS1 gene, initially discovered for its role in suppressing tumor metastasis but later recognized as a critical regulator of reproductive function. Kisspeptin neurons, primarily located in the arcuate nucleus and anteroventral periventricular nucleus of the hypothalamus, provide the major stimulatory input to GnRH neurons through the kisspeptin receptor (GPR54/KISS1R). This peptide is essential for pubertal development, as mutations in either kisspeptin or its receptor cause hypogonadotropic hypogonadism. Kisspeptin levels fluctuate across the menstrual cycle and are influenced by metabolic status, stress, and photoperiod, making it a key integrator of internal and external cues affecting reproduction.
Usage
Usage note: Originally called metastin; ensure current terminology is used consistently throughout documents.
In Context
- "Mutations in the kisspeptin receptor gene resulted in constitutional delay of puberty in the affected siblings." — Pediatric endocrinology case report
- "Kisspeptin administration successfully triggered ovulation in women with hypothalamic amenorrhea." — Reproductive endocrinology study