title: Prevention of the photodamage in the hairless mouse dorsal skin by kojic acid as an iron chelator.
abstract: Kojic acid, a fungal metabolic product, has been used as a skin-depigmenting agent in skin care products marketed in Japan. Iron in the skin is known to be involved in wrinkling as a result of chronic photodamage. Kojic acid was expected to have anti-wrinkling activity, since it possesses iron-chelating activity. We now evaluated the anti-wrinkling activity of kojic acid by using hairless mice exposed to chronic solar-simulating ultraviolet (UV) irradiation as model animal. At the end of a 20-week irradiation period, topical application of kojic acid before UV irradiation was observed to dramatically prevent: (1) the wrinkling, (2) hyperplasia of the epidermis, (3) fibrosis of the lower dermis, and (4) the increase of extracellular matrix components in the upper dermis. These findings indicate that kojic acid is a typical agent preventing wrinkling of the skin due to chronic photodamage.
authors.affiliation: Sansho Seiyaku Co., Fukuoka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Mitani
authors.forename: I
authors.initials: I
authors.lastname: Koshiishi
authors.forename: T
authors.initials: T
authors.lastname: Sumita
authors.forename: T
authors.initials: T
authors.lastname: Imanari
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004492:Edetic Acid / Q000494:pharmacology; D005260:Female; D007502:Iron Chelating Agents / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects; D008315:Malondialdehyde / Q000378:metabolism; D051379:Mice; D010084:Oxidation-Reduction / Q000187:drug effects; D010091:Oximes / Q000494:pharmacology; D010618:Phenanthrolines / Q000494:pharmacology; D011753:Pyrones / Q000494:pharmacology*; D012867:Skin / Q000187:drug effects* / Q000473:pathology / Q000528:radiation effects; D015595:Skin Aging / Q000187:drug effects* / Q000528:radiation effects; D013473:Sunscreening Agents / Q000494:pharmacology*; D014466:Ultraviolet Rays / Q000009:adverse effects
chemical_list: D007502:Iron Chelating Agents; D010091:Oximes; D010618:Phenanthrolines; D011753:Pyrones; D013473:Sunscreening Agents; C014565:furildioxime; D008315:Malondialdehyde; C011890:kojic acid; D004492:Edetic Acid; D001205:Ascorbic Acid; C025205:1,10-phenanthroline