A kisspeptin-10 analog with greater in vivo bioactivity than kisspeptin-10

作者：Curtis Annette E; Cooke Jennifer H; Baxter Jordan E; Parkinson James R C; Bataveljic Attia; Ghatei Mohammad A; Bloom Stephen R; Murphy Kevin G^*

来源：American Journal of Physiology - Endocrinology And Metabolism, 2010, 298(2): E296-E303.

DOI：10.1152/ajpendo.00426.2009

• Kiss-1
• KISS1R
• agonist
• luteinizing hormone
• testosterone

Curtis AE, Cooke JH, Baxter JE, Parkinson JR, Bataveljic A, Ghatei MA, Bloom SR, Murphy KG. A kisspeptin-10 analog with greater in vivo bioactivity than kisspeptin-10. Am J Physiol Endocrinol Metab 298: E296-E303, 2010. First published November 24, 2009; doi:10.1152/ajpendo.00426.2009.-The kisspeptins are neuropeptides that stimulate the hypothalamo-pituitary-gonadal (HPG) axis. The smallest endogenous kisspeptin, kisspeptin-10 (KP-10), binds to the receptor KISS1R with a similar affinity to the full-length peptide, kisspeptin-54 (KP-54), but is less effective in vivo, possibly because of increased enzymatic breakdown or clearance. The kisspeptin system may have therapeutic potential in the treatment of reproductive disorders and endocrine cancers. We have rationally modified the structure of KP-10 and tested the binding affinity of these analogs for the KISS1R. Those analogs that bound with relatively high affinity to KISS1R were tested for ability to stimulate ERK1/2 phosphorylation in vitro and for their ability to stimulate the HPG axis in vivo. One analog, [dY](1)KP-10, bound to KISS1R with lower affinity to KP-10 and exhibited similar bioactivity in vitro. However, in vivo peripheral administration of [dY](1)KP-10 increased plasma LH and testosterone more potently than KP-10 itself at 20 min postinjection in mice. In addition, 60 min postinjection, 0.15 nmol [dY](1)KP-10 significantly increased total testosterone levels in mice whereas the same dose of KP-10 had no significant effect. Should manipulation of the kisspeptin/KISS1R signaling system prove therapeutically useful, long-lasting analogs such as [dY](1)KP-10 may have greater therapeutic potential than endogenous forms of kisspeptin.

• 出版日期2010-2