title: Effect of lignans isolated from Hernandia nymphaeifolia on estrogenic compounds-induced calcium mobilization in human neutrophils.
abstract: The effect of five lignans isolated from Hernandia nymphaeifolia on estrogenic compounds (17beta-estradiol, tamoxifen and clomiphene)-induced Ca(2+) mobilization in human neutrophils was investigated. The five lignans were epi-yangambin, epi-magnolin, epi-aschantin, deoxypodophyllotoxin and yatein. In Ca(2+)-containing medium, the lignans (50-100 microM) inhibited 10 microM 17beta-estradiol- and 5 microM tamoxifen-induced increases in intracellular free Ca(2+) levels ([Ca(2+)](i)) without changing 25 microM clomiphene-induced [Ca(2+)](i) increase. 17beta-estradiol and tamoxifen increased [Ca(2+)](i) by causing Ca(2+) influx and Ca(2+) release because their responses were partly reduced by removing extracellular Ca(2+). In contrast, clomiphene solely induced Ca(2+) release. The effect of the lignans on these two Ca(2+) movement pathways underlying 17beta-estradiol- and tamoxifen-induced [Ca(2+)](i) increases was explored. All the lignans (50-100 microM) inhibited 10 microM 17beta-estradiol-and 5 microM tamoxifen-induced Ca(2+) release, and 17beta-estradiol-induced Ca(2+) influx. However, only 100 microM epi-aschantin was able to reduce tamoxifen-induced Ca(2+) influx while the other lignans had no effect. Collectively, this study shows that the lignans altered estrogenic compounds-induced Ca(2+) signaling in human neutrophils in a multiple manner.
authors: Graduate Institute of Pharmaceutical Sciences, Kaohsiung Medical University, 807, Kaohsiung, Taiwan.
authors: Yu-Ying
authors: YY
authors: Chao
authors: Chung-Ren
authors: CR
authors: Jan
authors: Ying-Chin
authors: YC
authors: Ko
authors: Jih-Jung
authors: JJ
authors: Chen
authors: Bang Ping
authors: BP
authors: Jiann
authors: Yih-Chau
authors: YC
authors: Lu
authors: Wei-Chung
authors: WC
authors: Chen
authors: Warren
authors: W
authors: Su
authors: Ih-Sheng
authors: IS
authors: Chen
mesh_terms: D002118:Calcium / Q000378:metabolism; D002996:Clomiphene / Q000494:pharmacology; D004347:Drug Interactions; D004958:Estradiol / Q000494:pharmacology; D004965:Estrogen Antagonists / Q000494:pharmacology*; D004967:Estrogens / Q000494:pharmacology*; D006801:Humans; D017705:Lignans / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects* / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000737:chemistry; D013629:Tamoxifen / Q000494:pharmacology
chemical_list: D004965:Estrogen Antagonists; D004967:Estrogens; D017705:Lignans; D010936:Plant Extracts; D013629:Tamoxifen; D002996:Clomiphene; D004958:Estradiol; D002118:Calcium