title: Protoberberine alkaloids and their reversal activity of P-gp expressed multidrug resistance (MDR) from the rhizome of Coptis japonica Makino.
abstract: Six protoberberine alkaloids were isolated from the chloroform layer of the rhizome of Coptis japonica Makino (Ranunculaceae). The structures of the isolated compounds were determined to be 6-([1,3]dioxolo[4,5-g]isoquinoline-5-carbonyl)-2,3-dimethoxy-benzoic acid methyl ester (1), oxyberberine (2), 8-oxo-epiberberine (3), 8-oxocoptisine (4), berberine (5) and palmatine (6) by physicochemical and spectroscopic methods. The compound 3 (8-oxo-epiberberine) was first isolated from natural sources. The compounds were tested for cytotoxicity against five tumor cell lines in vitro by SRB method, and also tested for the MDR reversal activities. Compound 4 was of significant P-gp MDR inhibition activity with ED50 value 0.018 microg/mL in MES-SA/DX5 cell and 0.0005 microg/mL in HCT15 cell, respectively.
authors.affiliation: Natural Products Laboratory, College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Yong Deuk
authors.initials: YD
authors.lastname: Min
authors.forename: Min Cheol
authors.initials: MC
authors.lastname: Yang
authors.forename: Kyu Ha
authors.initials: KH
authors.lastname: Lee
authors.forename: Kyung Ran
authors.initials: KR
authors.lastname: Kim
authors.forename: Sang Un
authors.initials: SU
authors.lastname: Choi
authors.forename: Kang Ro
authors.initials: KR
authors.lastname: Lee
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics*; D001600:Berberine Alkaloids / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002851:Chromatography, High Pressure Liquid; D039323:Coptis / Q000737:chemistry*; D018432:Drug Resistance, Multiple / Q000235:genetics*; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry; D027343:Rhizome / Q000737:chemistry; D012235:Rhodamines; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D001600:Berberine Alkaloids; D010936:Plant Extracts; D012235:Rhodamines; C022027:lissamine rhodamine B