NCIt definition : A synthetic peptide analogue of the naturally occurring alpha-melanocyte stimulating
hormone (a-MSH) with potential photoprotective activity. Mimicking the action of a-MSH,
afamelanotide stimulates melanocytes to increase the production and release of melanin.
Increased melanocyte melanin may protect against ultraviolet radiation (UVR)-initiated
cellular DNA damage, oxidation of membrane proteins, and alterations in intracellular
signaling processes in epidermal cells. Endogenously, a-MSH is released by skin cells
in response to UVR exposure, stimulating melanocytes to produce and release melanin.;