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In this study, a combination of <jats:styled-content style=\"fixed-case\">RNA<\/jats:styled-content>i and pharmacologic approaches were used to determine which <jats:styled-content style=\"fixed-case\">ALDH<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>1 substrates and products regulate melanogenesis. Initial studies revealed that neither the <jats:styled-content style=\"fixed-case\">UV<\/jats:styled-content>\u2010induced lipid aldehyde 4\u2010hydroxy\u20102\u2010nonenal nor the <jats:styled-content style=\"fixed-case\">ALDH<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>1 product all\u2010<jats:italic>trans<\/jats:italic> retinoic acid appreciably induced melanogenesis. In contrast, both the <jats:styled-content style=\"fixed-case\">ALDH<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>1 substrate 9\u2010<jats:italic>cis<\/jats:italic> retinal and its corresponding product 9\u2010<jats:italic>cis<\/jats:italic> retinoic acid potently induced the accumulation of <jats:styled-content style=\"fixed-case\"><jats:italic>MITF<\/jats:italic><\/jats:styled-content> m<jats:styled-content style=\"fixed-case\">RNA<\/jats:styled-content>,<jats:italic> <jats:styled-content style=\"fixed-case\">T<\/jats:styled-content>yrosinase<\/jats:italic> m<jats:styled-content style=\"fixed-case\">RNA<\/jats:styled-content> and melanin. <jats:styled-content style=\"fixed-case\">ALDH<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>1 depletion inhibited the ability of 9\u2010<jats:italic>cis<\/jats:italic> retinal but not 9\u2010<jats:italic>cis<\/jats:italic> retinoic acid to stimulate melanogenesis, indicating that <jats:styled-content style=\"fixed-case\">ALDH<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>1 regulates melanogenesis by catalysing the conversion of 9\u2010<jats:italic>cis<\/jats:italic> retinal to 9\u2010<jats:italic>cis<\/jats:italic> retinoic acid. The addition of potent <jats:styled-content style=\"fixed-case\">ALDH<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">A<\/jats:styled-content> inhibitors (cyanamide or <jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>ngeli's salt) suppressed <jats:italic><jats:styled-content style=\"fixed-case\">T<\/jats:styled-content>yrosinase<\/jats:italic> and <jats:styled-content style=\"fixed-case\"><jats:italic>MITF<\/jats:italic><\/jats:styled-content> m<jats:styled-content style=\"fixed-case\">RNA<\/jats:styled-content> accumulation <jats:italic>in vitro<\/jats:italic> and also melanin accumulation in skin equivalents, suggesting that 9\u2010<jats:italic>cis<\/jats:italic> retinoids regulate melanogenesis in the intact epidermis. Taken together, these studies not only identify cyanamide as a potential novel treatment for hyperpigmentary disorders, but also identify 9\u2010<jats:italic>cis<\/jats:italic> retinoic acid as a pigment stimulatory agent that may have clinical utility in the treatment of hypopigmentary disorders, such as vitiligo.<\/jats:p>","DOI":"10.1111\/exd.12099","type":"journal-article","created":{"date-parts":[[2013,1,25]],"date-time":"2013-01-25T18:37:54Z","timestamp":1359139074000},"page":"202-209","source":"Crossref","is-referenced-by-count":37,"title":["9\u2010<i>cis<\/i> retinoic acid is the <scp>ALDH<\/scp>1<scp>A<\/scp>1 product that stimulates melanogenesis"],"prefix":"10.1111","volume":"22","author":[{"given":"Elyse K","family":"Paterson","sequence":"first","affiliation":[{"name":"Department of Biological Chemistry University of California Irvine CA 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