title: Tripfordines A-C, sesquiterpene pyridine alkaloids from Tripterygium wilfordii, and structure anti-HIV activity relationships of Tripterygium alkaloids.
abstract: Three new sesquiterpene pyridine alkaloids, tripfordines A-C (1-3), were isolated from an ethanolic extract of the roots of Tripterygium wilfordii, along with eight known pyridine alkaloids, and tested for in vitro cytotoxic and anti-HIV activity. The structures of the new compounds were established on the basis of spectroscopic data interpretation. Anti-HIV structure-activity relationships (SAR) for this compound type are proposed on the basis of the screening results from the newly isolated compounds and prior data of known sesquiterpene pyridine alkaloids. The position of a carboxyalkyl chain on the pyridine moiety was not critical since both 2'- and 4'-substituted compounds exhibited high anti-HIV activity (EC(50) 0.1 microg/mL). In contrast, a hydroxy group at C-8' (carboxypropyl side chain) or C-9' (carboxybutyl side chain) was found to affect anti-HIV activity.
authors.affiliation: Department of Interdisciplinary Studies of Natural Environment, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Horiuch
authors.forename: Chihiro
authors.initials: C
authors.lastname: Murakami
authors.forename: Narihiko
authors.initials: N
authors.lastname: Fukamiya
authors.forename: Donglei
authors.initials: D
authors.lastname: Yu
authors.forename: Tzu-Hsuan
authors.initials: TH
authors.lastname: Chen
authors.forename: Kenneth F
authors.initials: KF
authors.lastname: Bastow
authors.forename: De-Cheng
authors.initials: DC
authors.lastname: Zhang
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Takaishi
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Imakura
authors.forename: Kuo-Hsiung
authors.initials: KH
authors.lastname: Lee
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D019380:Anti-HIV Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D013329:Structure-Activity Relationship; D029757:Tripterygium / Q000737:chemistry*
chemical_list: D000470:Alkaloids; D019380:Anti-HIV Agents; D004365:Drugs, Chinese Herbal; D011725:Pyridines; D012717:Sesquiterpenes; C514312:tripfordine A; C514313:tripfordine B; C514314:tripfordine C; C023666:pyridine