Inhibitory Effect of Iinoleic Acid on Melanogenesis.

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Linoleic acid has an inhibitory effect on melanogenesis in B16 mouse melanoma cells. Linoleic acid did not affect the expression level of tyrosinase mRNA and the pattern of tyrosinase glycosylation. The production of premelanosomes and the transfer of tyrosinase into them were also not affected by linoleic acid. The decrease of tyrosinase activity in golgi apparatus and the inhibition of melanin polymer formation within premelanosomes were found in linoleic acid-treated B16 cells.Using cultured normal human melanocytes, it was shown that linoleic acid inhibited melanogenesis as well as using B16 cells.We also report here the evidence that linoleic acid can diminish UVB-induced pigmentation. Linoleic acid was topically applied daily for one month after UVB-induced pigmentation was fully developed on the back of brownish guinea pigs, and resulted to marked depigmentation.
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