MC1R receptor research provides the mechanistic foundation for understanding Melanotan I as a research tool. MC1R (melanocortin 1 receptor) is a G protein coupled receptor expressed primarily on melanocytes in the skin, where it mediates the effects of alpha-MSH and Melanotan I on melanogenesis and pigmentation in research models. As the receptor biology component of the Melanotan I research cluster, this article reviews the published literature on MC1R structure, signaling pathways, tissue distribution, and the mechanism of action that underlies Melanotan I research in animal models.
MC1R Receptor Research: The Target of Melanotan I in Research
Melanotan I · Published April 9, 2026 · Updated May 18, 2026 · 8 min read
Quick Answer
MC1R receptor research covers class A GPCR structure, Gαs signaling pathways, melanocyte expression, and the MC1R activation mechanism underlying Melanotan I research. Studies examine cAMP/PKA signaling, MITF activation, and melanogenic gene expression in cellular and rodent melanocyte research models. For research use only, not for human consumption.
Research Use Only. All products are strictly for research use only (RUO). Not for human consumption. Products on this site are not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the FDA. By purchasing, you agree that you are a qualified researcher and that products will be used solely for in-vitro research purposes.
Frequently Asked Questions
What is Melanotan I in research contexts?
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Melanotan I (afamelanotide) is a synthetic 13-amino-acid analog of alpha-melanocyte-stimulating hormone (alpha-MSH) with high MC1R selectivity. It is studied in preclinical research and clinical literature for melanogenesis, photoprotection, and erythropoietic protoporphyria.
What is the structure of MC1R?
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MC1R is a class A G protein-coupled receptor with seven transmembrane domains, expressed predominantly on melanocytes. It binds alpha-MSH and ACTH-derived peptides with high affinity, transmitting signals through Gs alpha to elevate cAMP and activate melanogenic gene transcription.
How does Melanotan I selectively target MC1R?
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Melanotan I retains the alpha-MSH core sequence but with substitutions (Nle at position 4, D-Phe at position 7) that increase MC1R potency and resistance to enzymatic degradation while maintaining selectivity over other melanocortin receptors.
Is Melanotan I approved for human use?
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No. Melanotan I is not approved by the FDA for any human therapeutic use. It is supplied strictly for in-vitro and preclinical research purposes by qualified investigators.
Glossary
Key terms used in this article.
- MC1R
- Melanocortin 1 receptor, the primary GPCR on melanocytes that signals melanin synthesis upon alpha-MSH binding.
- Melanogenesis
- The biochemical pathway producing melanin from tyrosine within melanosomes of melanocytes.
- Eumelanin
- The dark brown to black melanin pigment that provides photoprotective absorbance of UV radiation.
- Tyrosinase
- The rate-limiting copper-dependent enzyme catalyzing the first two steps of melanin biosynthesis from tyrosine.
- Erythropoietic Protoporphyria (EPP)
- A rare genetic disorder of heme biosynthesis causing severe photosensitivity, the indication for clinical afamelanotide use.
- Class A GPCR
- The largest family of G protein-coupled receptors, including melanocortin receptors and many other small-molecule and peptide receptors.
- Melanocyte
- The pigment-producing cell of the epidermis, hair follicle, and other tissues, primary target of MC1R signaling.
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Research Use Only. All products are strictly for research use only (RUO). Not for human consumption. Products on this site are not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the FDA. By purchasing, you agree that you are a qualified researcher and that products will be used solely for in-vitro research purposes.
