Source comparison
PT-141 vs Melanotan 2: Structural and Functional Differences
PT-141 and Melanotan 2 (MT2) are both melanocortin receptor agonists but differ in their chemical structure, receptor selectivity profile, and consequent biological effects. Structural differences: Melanotan 2 is a hexapeptide (six amino acids) with a relative
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- PT-141 and Melanotan 2 (MT2) are both melanocortin receptor agonists but differ in their chemical structure, receptor selectivity profile, and consequent biological effects.
- Structural differences: Melanotan 2 is a hexapeptide (six amino acids) with a relatively non-selective melanocortin receptor agonist profile, activating MC1R, MC3R, MC4R, and MC5R with varying affinities. PT-141, by contrast, is a seven-amino acid peptide with greater selectivity for MC3R and MC4R relative to MC1R, conferring reduced effects on melanin production.
- Off-target effects — pigmentation: Because Melanotan 2 is a non-selective melanocortin agonist, it readily activates MC1R on melanocytes, promoting melanin synthesis and consequent darkening of skin pigmentation. This effect is a notable side effect of Melanotan 2 research and is unrelated to the sexual function effects. PT-141’s selectivity for MC3R/MC4R reduces its activity at MC1R, minimising unwanted skin pigmentation, making it a more selective research tool for investigating sexual function without the confounding melanin production effects.
- Sexual function effects: Both compounds enhance sexual function through melanocortin receptor activation, but PT-141’s greater selectivity for MC3R/MC4R may result in a more pronounced effect on sexual arousal and motivation relative to other melanocortin effects. Research comparing the two compounds directly is limited, but the chemical selectivity suggests potential differences in potency or specificity for sexual function endpoints.
- Research implications: For research specifically aimed at investigating sexual function and arousal, PT-141’s greater selectivity makes it the preferred compound, as it allows investigation of sexual effects without the complicating variable of increased skin pigmentation. The selectivity represents an advance in melanocortin research compounds.