Palmitoylation-dependent activation of MC1R prevents melanomagenesis

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The melanocortin-1 receptor (MC1R), a G-protein-coupled receptor, has a crucial role in human and mouse pigmentation1,2,3,4,5,6,7,8. Activation of MC1R in melanocytes by α-melanocyte-stimulating hormone (α-MSH)9stimulates cAMP signalling and melanin production and enhances DNA repair after ultraviolet irradiation10,11,12,13,14,15,16. Individuals carrying MC1R variants, especially those associated with red hair colour, fair skin and poor tanning ability (denoted as RHC variants), are associated with higher risk of melanoma5,17,18,19,20. However, how MC1R activity is modulated by ultraviolet irradiation, why individuals with red hair are more prone to developing melanoma, and whether the activity of RHC variants might be restored for therapeutic benefit are unknown. Here we demonstrate a potential MC1R-targeted intervention strategy in mice to rescue loss-of-function MC1R inMC1RRHC variants for therapeutic benefit by activating MC1R protein palmitoylation. MC1R palmitoylation, primarily mediated by the protein-acyl transferase ZDHHC13, is essential for activating MC1R signalling, which triggers increased pigmentation, ultraviolet-B-induced G1-like cell cycle arrest and control of senescence and melanomagenesisin vitroandin vivo. Using C57BL/6J-Mc1re/eJ mice, in which endogenous MC1R is prematurely terminated, expressingMc1rRHC variants, we show that pharmacological activation of palmitoylation rescues the defects ofMc1rRHC variants and prevents melanomagenesis. The results highlight a central role for MC1R palmitoylation in pigmentation and protection against melanoma.

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