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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Inhibition of 12-O-tetradecanoylphorbol-13-acetate-induced tumor promotion and epidermal ornithine decarboxylase activity in mouse skin by palmitoylcarnitine.

Palmitoylcarnitine, which has been reported to be an inhibitor of calcium-activated, phospholipid-dependent protein kinase (protein kinase C), inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced epidermal ornithine decarboxylase in mouse skin in a dose-dependent manner. Neither acetylcarnitine nor palmitic acid inhibited TPA-caused ornithine decarboxylase induction. In addition, palmitoylcarnitine markedly inhibited skin tumor promotion induced by TPA. Palmitoylcarnitine inhibited epidermal protein kinase C activity which was stimulated by Ca2+ in the presence of phosphatidylserine but failed to inhibit the enzyme activity which was stimulated by TPA in the presence of either phosphatidylserine or Ca2+ plus phosphatidylserine. Therefore, it seems unlikely that the potent anti-tumor-promoting action of palmitoylcarnitine, which is shown in the present study, is explained solely by its effect on protein kinase C.[1]


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