[Nle4, D-Phe7]-alpha-MSH: a superpotent melanotropin with prolonged action on vertebrate chromatophores.
Hadley. M E ME; Mieyr. J H JH; Martin. B E BE; Castrucci. A M AM; Hruby. V J VJ; Sawyer. T K TK; Powers. E A EA; Rao. K R KR
Key Findings
- Melanotan‑I is a super‑potent agonist in frog and lizard skin assays
- The analogue produces ultra‑prolonged melanotropic activity both in vitro and in vivo across many vertebrates
- Its strong, long‑lasting effect makes it useful as a research tool when prolonged pigment activation is needed
Practical Outcomes
- For biohackers, this confirms that melanotan‑I can produce lasting tanning effects, potentially allowing less frequent dosing. However, because the data are from non‑human models, there’s no direct guidance for safe human use, so any self‑experimentation should be approached with caution and further research.
Summary
The study shows that the peptide melanotan‑I (a modified alpha‑MSH) is a very strong and long‑lasting activator of pigment cells in many animal species, meaning it can cause sustained skin darkening with fewer doses. However, the research is all in frogs, lizards, snakes and fish – there’s no human data, safety info, or guidance on dosing for health or performance purposes.
Abstract
The in vitro and in vivo responses of integumental chromatophores to alpha-MSH and a related analogue, [Nle4, D-Phe7] -alpha-MSH, were studied in a number of vertebrate species: the teleost, Lebistes reticulatus; the amphibians, Rana pipiens, R. catesbeiana, Xenopus laevis, Bufo alvarius, and B. cognatus; the lizard, Anolis carolinensis; the rattlesnake, Crotalus atrox. The alpha-melanotropin analogue was a superpotent agonist in the in vitro frog (R. pipiens, R. catesbeiana) and lizard (A. carolinensis) skin bioassays. In all species studied, the analogue exhibited ultraprolonged melanotropic activity, both in vitro and in vivo. This melanotropin and related analogues should prove useful in the study of numerous physiological processes, particularly when prolonged melanotropic activity is desired.
Study Information
pubmed
1985
10.1016/0300-9629(85)90259-2
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