医学
雌激素受体
雌激素
IC50型
受体
内科学
转染
内生
敌手
内分泌学
药理学
体外
生物化学
生物
基因
癌症
乳腺癌
作者
Tracie Locklear,Yue Huang,Jonna Frasor,Brian J. Doyle,Alice L. Pérez,Jorge Gómez-Laurito,Gail B. Mahady
出处
期刊:Maturitas
[Elsevier]
日期:2010-07-01
卷期号:66 (3): 315-322
被引量:28
标识
DOI:10.1016/j.maturitas.2010.04.001
摘要
Objectives To investigate the biological activities of Justicia pectoralis Jacq. (Acanthaceae), an herbal medicine used in Costa Rica (CR) for the management of menopausal symptoms and dysmenorrhea. Study design The aerial parts of J. pectoralis were collected, dried and extracted in methanol. To establish possible mechanisms of action of JP for the treatment of menopausal symptoms, the estrogenic and progesterone agonists, and antiinflammatory activities were investigated. Main outcome measures The methanol extract (JP-M) was tested in ER and PR binding assays, a COX-2 enzyme inhibition assay, the ERβ-CALUX assay in U2-OS cells, as well as reporter and endogenous gene assays in MCF-7 K1 cells. Results The JP-M extract inhibited COX-2 catalytic activity (IC50 4.8 μg/mL); bound to both ERα and ERβ (IC50 50 μg/mL and 23.1 μg/mL, respectively); induced estrogen-dependent transcription in the ERβ-CALUX; and bound to the progesterone receptor (IC50 22.8 μg/mL). The extract also modulated the expression of endogenous estrogen responsive genes pS2, PR, and PTGES in MCF-7 cells at a concentration of 20 μg/mL. Activation of a 2 ERE-construct in transiently transfected MCF-7 cells by the extract was inhibited by the estrogen receptor antagonist ICI 182,780, indicating that the effects were mediated through the estrogen receptor. Finally, the extract weakly enhanced the proliferation of MCF-7 cells, however this was not statistically significant as compared with DMSO controls. Conclusions Extracts of J. pectoralis have estrogenic, progestagenic and anti-inflammatory effects, and thus have a plausible mechanism of action, explaining its traditional use for menopause and PMS.
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