What Is Kisspeptin?

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Kisspeptin refers to a family of neuropeptides derivado(a) de the KISS1 gene, originally descoberto(a) em 1996 by Danny R. Welch and J.H. Lee in Hershey, Pennsylvania, como um(a) melanoma metastasis suppressor. The gene was named "KiSS-1" to honor the discovery location near the Hershey's Kisses chocolate factory, with "SS" denoting "suppressor sequence."[1]

The KISS1 gene encodes a 145-aminoacido prepro-kisspeptin precursor que undergoes proteolytic cleavage to produce four biologically ativo(a) isoforms: Kisspeptin-54 (Kp-54), Kp-14, Kp-13, and Kp-10. All isoforms share a conserved C-terminal decapeptide containing an RF-amide motif (Arg-Phe-NH₂) essencial para binding and activating the KISS1R (GPR54) receptor.[2][3]

Kp-54 is o(a) principal circulating form with a meia-vida of ~27.6 minutes; the shorter Kp-10 (~4 min meia-vida) exibe full intrinsic bioactivity e e highly conserved across species.[5]

In 2003, Stephanie Seminara and colleagues made the landmark discovery que loss-of-function mutations in KISS1R (GPR54) cause idiopathic hypogonadotropic hypogonadism and pubertal failure — establishing kisspeptin como o(a) gatekeeper of sexual maturacao.[4]

Kisspeptin is atualmente investigacional — not aprovado(a) por the FDA or EMA for general clinical use. It is prohibited by WADA under S2 (Peptide Hormones, Growth Factors) as it estimula LH/FSH/testosterone production.[7]