The effects of the standardized extracts of Ginkgo biloba on steroidogenesis pathways and aromatase activity in H295R human adrenocortical carcinoma cellsThe effects of the standardized extracts of Ginkgo biloba on steroidogenesis pathways and aromatase activity in H295R human adrenocortical carcinoma cells
- Other Titles
- The effects of the standardized extracts of Ginkgo biloba on steroidogenesis pathways and aromatase activity in H295R human adrenocortical carcinoma cells
- Authors
- 김미지[김미지]; 박용주[박용주]; 안희연[안희연]; 문병학[문병학]; 정규혁[정규혁]; 오승민[오승민]
- Issue Date
- 2016
- Publisher
- 환경독성보건학회
- Keywords
- Ginkgo biloba extracts; Aromatase inhibitor; H295R cells; Steroidogenesis
- Citation
- 환경독성보건학회지, v.31, pp.1 - 8
- Indexed
- KCI
OTHER
- Journal Title
- 환경독성보건학회지
- Volume
- 31
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/39592
- ISSN
- 2093-6400
- Abstract
- Objectives: Aromatase inhibitors that block estrogen synthesis are a proven first-line hor¬monal therapy for postmenopausal breast cancer. Although it is known that standard¬ized extract of Ginkgo biloba (EGb761) induces anti-carcinogenic effects like the aroma¬tase inhibitors, the effects of EGb761 on steroidogenesis have not been studied yet. Therefore, the effects of EGb761 on steroidogenesis and aromatase activity was studied using a H295R cell model, which was a good in vitro model to predict effects on human adrenal steroidogenesis.
Methods: Cortisol, aldosterone, testosterone, and 17β-estradiol were evaluated in the H295R cells by competitive enzyme-linked immunospecific assay after exposure to EGb761. Real-time polymerase chain reaction were performed to evaluate effects on critical genes in steroid hormone production, specifically cytochrome P450 (CYP11/ 17/19/21) and the hydroxysteroid dehydrogenases (3β-HSD2 and 17β-HSD1/4). Finally, aromatase activi¬ties were measured with a tritiated water-release assay and by western blotting analysis.
Results: H295R cells exposed to EGb761 (10 and 100 μg/mL) showed a significant de¬crease in 17β-estradiol and testosterone, but no change in aldosterone or cortisol. Genes (CYP19 and 17β-HSD1) related to the estrogen steroidogenesis were significantly de¬creased by EGb761. EGb761 treatment of H295R cells resulted in a significant decrease of aromatase activity as measured by the direct and indirect assays. The coding se¬quence/Exon PII of CYP19 gene transcript and protein level of CYP19 were significantly decreased by EGb761.
Conclusions: These results suggest that EGb761 could regulate steroidogenesis-related genes such as CYP19 and 17β-HSD1, and lead to a decrease in 17β-estradiol and testos¬terone. The present study provides good information on potential therapeutic effects of EGb761 on estrogen dependent breast cancer.
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