Melanotan II is a synthetic cyclic analogue of the α-MSH pharmacophore. Its structure is commonly described as Ac-Nle⁴-Asp⁵-His⁶-D-Phe⁷-Arg⁸-Trp⁹-Lys¹⁰-α-MSH(4–10)-NH₂. It was developed as a potent melanotropic compound and subsequently became an important experimental tool for studying melanocortin receptors.
Unlike Melanotan I, MT-II is relatively non-selective, which is important when interpreting its effects. Its activity at MC1R is associated with melanogenesis, while activity at MC4R and other melanocortin receptors contributes to effects involving appetite, energy balance and sexual function.
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