title: Depigmentation of melanocytes by isopanduratin A and 4-hydroxypanduratin A isolated from Kaempferia pandurata ROXB.
abstract: This study was carried out to investigate the in vitro effects of isopanduratin A and 4-hydroxypanduratin A isolated from Kaempferia pandurata ROXB. on melanin biosynthesis and tyrosinase activity. Two chalcone compounds, isopanduratin A and 4-hydroxypanduratin A, were isolated from the ethyl acetate fraction of ethanol extract as the active principles. Compared with phenylthiourea (IC(50)=34.3 microM) as a positive control, the depigmentation IC(50) values for isopanduratin A and 4-hydroxypanduratin A were 10.6 microM and 23.2 microM, respectively. The compounds also significantly inhibited the activity of tyrosinase, the enzyme that converts DOPA (3,4-dihydroxyphenylalanine) to dopachrome in the biosynthetic process of melanin. The IC(50) values of isopanduratin A and 4-hydroxypanduratin A for tyrosinase were 10.5 microM and >30 microM, respectively, while that of phenylthiourea was 47.6 microM. The tyrosinase protein level was also significantly decreased by isopanduratin A and 4-hydroxypanduratin A. The results indicate that isopanduratin A and 4-hydroxypanduratin A isolated from K. pandurata ROXB. are promising compounds that could be useful for treating hyperpigmentation as skin-whitening agents.
authors.affiliation: Department of Biotechnology, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, Korea.
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Yoon
authors.forename: Jae-Seok
authors.initials: JS
authors.lastname: Shim
authors.forename: Yumi
authors.initials: Y
authors.lastname: Cho
authors.forename: Nam-In
authors.initials: NI
authors.lastname: Baek
authors.forename: Chan-Woo
authors.initials: CW
authors.lastname: Lee
authors.forename: Han-Sung
authors.initials: HS
authors.lastname: Kim
authors.forename: Jae-Kwan
authors.initials: JK
authors.lastname: Hwang
mesh_terms: D000818:Animals; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D047188:Chalcones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D020128:Inhibitory Concentration 50; D008543:Melanins / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D008544:Melanocytes / Q000187:drug effects*; D051379:Mice; D008810:Mice, Inbred C57BL; D015394:Molecular Structure; D014442:Monophenol Monooxygenase / Q000037:antagonists & inhibitors / Q000378:metabolism; D019906:Nuclear Magnetic Resonance, Biomolecular; D010670:Phenylthiourea / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D018517:Plant Roots / Q000737:chemistry; D013997:Time Factors; D030521:Zingiberaceae / Q000737:chemistry*
chemical_list: C525185:4-hydroxypanduratin A; D047188:Chalcones; D008543:Melanins; D010936:Plant Extracts; C487865:isopanduratin A; D010670:Phenylthiourea; D014442:Monophenol Monooxygenase