title: ent-Labdane diterpenoid lactone stereoisomers from Andrographis paniculata.
abstract: Two pairs of ent-labdane diterpenoid lactone stereoisomers (1- 4) including three new compounds (1- 3) were isolated from the 85% EtOH extract of the aerial parts of Andrographis paniculata. The structures of these compounds were identified as 7 R-hydroxy-14-deoxyandrographolide (1), 7 S-hydroxy-14-deoxyandrographolide (2), 12 S,13 S-hydroxyandrographolide (3), and 12 R,13 R-hydroxyandrographolide (4) by spectroscopic data analyses and calculated (13)C NMR data at the B3LYP/6-311++G(2d,p)//B3LYP/6-31G* level using the GIAO method. The 12 S-configuration of 4 was revised to 12 R based on the spectroscopic data. The antiproliferative activities of the two pairs of stereoisomers and 14 other ent-labdane diterpenoid derivatives were determined in human leukemia HL-60 cells. Andrographolide (7) and isoandrographolide (12) exhibited higher antiproliferative activities than other ent-labdane diterpenoids with GI 50's of 9.33 and 6.30 microM, respectively.
authors: School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, PR China.
authors: Lixia
authors: L
authors: Chen
authors: Huajie
authors: H
authors: Zhu
authors: Rui
authors: R
authors: Wang
authors: Kailan
authors: K
authors: Zhou
authors: Yongkui
authors: Y
authors: Jing
authors: Feng
authors: F
authors: Qiu
mesh_terms: D035685:Andrographis / Q000737:chemistry*; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018922:HL-60 Cells; D006801:Humans; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D004365:Drugs, Chinese Herbal