title: Oxoaporphine alkaloids and quinones from Stephania dinklagei and evaluation of their antiprotozoal activities.
abstract: Bioactivity-guided fractionation of Stephania dinklagei yielded six compounds including, two zwitterionic oxoaporphine alkaloids, N-methylliriodendronine, and 2-O,N-dimethylliriodendronine, two oxoaporphine alkaloids, liriodenine, and dicentrinone, one aporphine alkaloid, corydine, and one anthraquinone, aloe-emodin. Apart from corydine, the isolates have not been reported as constituents of S. dinklagei. N-Methylliriodendronine, and 2-O,N-dimethylliriodendronine are reported for the first time as natural products. All isolated compound were tested for antiprotozoal activity and cytotoxic activities in vitro. N-Methylliriodendronine was the most active against L. donovani amastigotes (IC50 = 36.1 microM). Liriodenine showed the highest activity against Leishmania donovani, and Plasmodium falciparum with IC50 values of 26.16 and 15 microM, respectively. Aloe-emodin was the only compound active (IC50 = 14 microM) against T. b. brucei.
authors.forename: M R
authors.initials: MR
authors.lastname: Camacho
authors.forename: G C
authors.initials: GC
authors.lastname: Kirby
authors.forename: D C
authors.initials: DC
authors.lastname: Warhurst
authors.forename: S L
authors.initials: SL
authors.lastname: Croft
authors.forename: J D
authors.initials: JD
authors.lastname: Phillipson
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000818:Animals; D000981:Antiprotozoal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001060:Aporphines / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006801:Humans; D007624:KB Cells; D007893:Leishmania donovani / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000737:chemistry*; D010963:Plasmodium falciparum / Q000187:drug effects; D011809:Quinones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D014346:Trypanosoma brucei brucei / Q000187:drug effects
chemical_list: D000470:Alkaloids; D000981:Antiprotozoal Agents; D001060:Aporphines; D011809:Quinones