title: Active compounds from Lagerstroemia speciosa, insulin-like glucose uptake-stimulatory/inhibitory and adipocyte differentiation-inhibitory activities in 3T3-L1 cells.
abstract: Seven ellagitannins, lagerstroemin (1), flosin B (2), stachyurin (3), casuarinin (4), casuariin (5), epipunicacortein A (6), and 2, 3-(S)-hexahydroxydiphenoyl-alpha/beta-D-glucose (7), together with one ellagic acid sulfate, 3-O-methyl-ellagic acid 4'-sulfate (8), ellagic acid (9), and four methyl ellagic acid derivatives, 3-O-methylellagic acid (10), 3,3'-di-O-methylellagic acid (11), 3,4,3'-tri-O-methylellagic acid (12), and 3,4,8,9,10-pentahydroxydibenzo[b,d]pyran-6-one (13), were identified by the bioassay-directed isolation from the leaves of Lagerstroemia speciosa (L.) Pers. The chemical structures of these components were established on the basis of one- and two-dimensional NMR and high-resolution mass spectroscopic analyses. Other known compounds, including corosolic acid, gallic acid, 4-hydroxybenzoic acid, 3-O-methylprotocatechuic acid, caffeic acid, p-coumaric acid, kaempferol, quercetin, and isoquercitrin, were also isolated from the same plant. The obtained ellagitannins exhibited strong activities in both stimulating insulin-like glucose uptake (1-5 and 7) and inhibiting adipocyte differentiation (1 and 4) in 3T3-L1 cells. Meanwhile, ellagic acid derivatives (10-13) showed an inhibitory effect on glucose transport assay. This study is the first to report an inhibitory effect for methyl ellagic acid derivatives.
authors.affiliation: Naturex, Inc., 375 Huyler Street, South Hackensack, New Jersey 07606, USA.
authors.forename: Naisheng
authors.initials: N
authors.lastname: Bai
authors.forename: Kan
authors.initials: K
authors.lastname: He
authors.forename: Marc
authors.initials: M
authors.lastname: Roller
authors.forename: Bolin
authors.initials: B
authors.lastname: Zheng
authors.forename: Xiaozhuo
authors.initials: X
authors.lastname: Chen
authors.forename: Zhongguang
authors.initials: Z
authors.lastname: Shao
authors.forename: Tangsheng
authors.initials: T
authors.lastname: Peng
authors.forename: Qunyi
authors.initials: Q
authors.lastname: Zheng
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000187:drug effects* / Q000502:physiology; D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects*; D005947:Glucose / Q000378:metabolism*; D047348:Hydrolyzable Tannins / Q000737:chemistry / Q000494:pharmacology; D007328:Insulin / Q000494:pharmacology*; D031563:Lagerstroemia / Q000737:chemistry*; D051379:Mice; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D047348:Hydrolyzable Tannins; D007328:Insulin; D010936:Plant Extracts; D005947:Glucose