Abstract
Most hypopigmenting reagents target the inhibition of tyrosinase, the key enzyme involved in melanin synthesis. In this issue, Choi et al. report that NADPH:quinone oxidoreductase-1 (NQO1) increases melanin synthesis, probably via the suppression of tyrosinase degradation. Because NQO1 was identified by comparing normally pigmented melanocytes with hypopigmented acral lentiginous melanoma cells, these results suggest various hypotheses regarding the carcinogenic origin of the latter.
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