title: Partially purified Curcuma longa inhibits alpha-melanocyte-stimulating hormone-stimulated melanogenesis through extracellular signal-regulated kinase or Akt activation-mediated signalling in B16F10 cells.
abstract: Bioassay-guided fractionation of Curcuma longa by solvent partitioning and purification with octadecylsilane open column chromatography yielded a partial purification. The active 80% methanol chromatographic fraction from the ethyl acetate layer [partial purification from C. longa (PPC)] was used to investigate the alpha-melanocyte-stimulating hormone (alpha-MSH)-stimulated melanogenesis signal pathway in B16F10 cells. In cells stimulated alpha-MSH, PPC inhibited cellular melanin contents, tyrosinase activity and expression of melanogenesis-related proteins including microphthalmia-associated transcription factor (MITF), tyrosinase and tyrosinase-related proteins (TRP). Melanogenesis-regulating signalling such as mitogen-activated protein kinase (MEK)/extracellular signal-regulated kinase (ERK) and phosphatidylinositol 3-kinase (PI3K)/Akt was activated by PPC in alpha-MSH-stimulated B16F10 cells. The suppressive activity of PPC on alpha-MSH-induced melanogenesis was abrogated by selective inhibition of MEK/ERK (PD98059) and PI3K (LY294002). MEK/ERK or Akt activation by PPC may contribute to reduced melanin synthesis via MITF and its downstream signal pathway including tyrosinase and TRPs in alpha-MSH-induced melanogenesis.
authors.affiliation: Division of Meridian and Structural Medicine, School of Oriental Medicine, Pusan National University, Busan 609-735, Korea.
authors.forename: Ji Yeon
authors.initials: JY
authors.lastname: Jang
authors.forename: Jun Hyuk
authors.initials: JH
authors.lastname: Lee
authors.forename: Seong Yun
authors.initials: SY
authors.lastname: Jeong
authors.forename: Kyung Tae
authors.initials: KT
authors.lastname: Chung
authors.forename: Yung Hyun
authors.initials: YH
authors.lastname: Choi
authors.forename: Byung Tae
authors.initials: BT
authors.lastname: Choi
mesh_terms: D000818:Animals; D030024:Curcuma / Q000378:metabolism*; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic; D008543:Melanins / Q000096:biosynthesis; D008544:Melanocytes / Q000378:metabolism*; D008546:Melanoma, Experimental; D051379:Mice; D051739:Microphthalmia-Associated Transcription Factor / Q000378:metabolism; D014442:Monophenol Monooxygenase / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism*; D015398:Signal Transduction; D000521:alpha-MSH / Q000378:metabolism*
chemical_list: D004791:Enzyme Inhibitors; D008543:Melanins; D051739:Microphthalmia-Associated Transcription Factor; C497235:Mitf protein, mouse; D010936:Plant Extracts; D000521:alpha-MSH; D014442:Monophenol Monooxygenase; D051057:Proto-Oncogene Proteins c-akt; D048049:Extracellular Signal-Regulated MAP Kinases