Chemical Identity

Mechanism of Action

Melanotan II is a cyclic synthetic heptapeptide analogue of α-MSH, developed through structural modification to improve receptor binding affinity and resistance to enzymatic degradation. Its core pharmacophore — the His-D-Phe-Arg-Trp sequence within the lactam ring — drives high-affinity, non-selective agonism across melanocortin receptor subtypes MC1R through MC5R.

MC1R agonism is the primary driver of eumelanin synthesis in melanocytes. Binding activates adenylyl cyclase via Gαs, elevating intracellular cAMP and activating PKA, which phosphorylates CREB and upregulates MITF — the master regulator of tyrosinase expression and melanogenesis.

MC4R agonism has attracted research interest in energy homeostasis. MC4R is expressed in hypothalamic arcuate and paraventricular nuclei, where activation by melanocortin peptides is implicated in satiety signaling and energy expenditure regulation.

Research Applications

• Melanocortin receptor (MC1R–MC5R) pharmacology and binding studies
• Melanogenesis and tyrosinase pathway research in melanocyte cell cultures
• MITF transcription factor activation and pigmentation biology research
• MC4R-mediated energy homeostasis and hypothalamic satiety circuit research
• Comparative α-MSH analogue structure-activity relationship studies
• cAMP/PKA/CREB signaling in melanocortin pathway research

Peer-Reviewed References

1. Hadley ME, Dorr RT. Melanocortin peptide therapeutics: historical milestones and commercialization. Peptides. 2006;27(4):921–930.
2. Catania A, et al. The melanocortin system in control of inflammation. ScientificWorldJournal. 2010;10:1840–1853.
3. Mountjoy KG, et al. The cloning of a family of genes that encode the melanocortin receptors. Science. 1992;257(5074):1248–1251.

Testing & Supply Specifications

Every Blueprint Labs batch is independently verified by third-party analytical laboratories prior to release. Identity and purity confirmed via HPLC and mass spectrometry. Full batch records maintained for chain-of-custody traceability.

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