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Molecular expression of 17 beta hydroxysteroid dehydrogenase types in relation to their activity in intact human
G Carruba1, J Adamski, M Calabrò
1Institute of Oncology, University Medical School, Policlinico, Palermo, Italy.
Abstract:
In the present study we have inspected estrogen metabolism in cultured human prostate cancer cells (LNCaP, DU145, PC3), in relation to the expression of mRNAs for different 17 beta hydroxysteroid dehydrogenase (17 beta HSD) enzymes (from 1 to 4). Using an intact cell analysis, we have compared precursor degradation and product formation after incubation of cells with physiological amounts of radioactive E2 or estrone (E1) for 24-72 h and subsequent reverse-phase high performance liquid chromatography analysis. The LNCaP and DU145 cells only partly converted E2 to E1 (26 and 13% at 72 h, respectively), giving rise to an appreciable production of E2 from E1 (nearly 20% in all cases). Conversely, PC3 cells revealed a massive E2 oxidation to E1 (up to 90% by 72 h) and a scant formation of E2 (<2%) from E1. In addition, an appreciable formation of 16 alpha OHE1 was seen in either PC3 (11%) or DU145 (5%) cells. respectively using E2 or E1 as precursor. All three cell lines exhibited marked amounts of 17 beta HSD4 mRNA species, whilst even greater amounts of 17 beta HSD2 transcript were found in PC3 cells only. No mRNA for either 17 beta HSD1 or 17 beta HSD3 could be detected in any cell line. The present evidence indicates that pathways of estrogen metabolism are distinctly governed in prostate cancer cells depending on their endocrine status, being associated with a differential expression of mRNA for different 17 beta HSD enzymes.
Insights
Prostate cancer cells show distinct estrogen metabolism pathways, influenced by 17 beta-hydroxysteroid dehydrogenase (17 beta HSD) enzyme expression. PC3 cells heavily convert estradiol (E2) to estrone (E1), unlike LNCaP and DU145 cells.
Area of Science:
- Endocrinology
- Molecular Biology
- Cancer Research
Background:
- Estrogen metabolism plays a role in prostate cancer development and progression.
- 17 beta-hydroxysteroid dehydrogenase (17 beta HSD) enzymes are critical in regulating estrogen activity.
- Understanding these pathways in different prostate cancer cell lines is crucial for targeted therapies.
Purpose of the Study:
- To investigate estrogen metabolism in cultured human prostate cancer cell lines (LNCaP, DU145, PC3).
- To correlate estrogen metabolism with the expression of 17 beta HSD enzyme mRNAs.
- To elucidate the differential regulation of estrogen pathways in distinct prostate cancer subtypes.
Main Methods:
- Intact cell analysis of estrogen precursor degradation and product formation.
- Incubation of LNCaP, DU145, and PC3 cells with radioactive estradiol (E2) or estrone (E1).
- Reverse-phase high-performance liquid chromatography (HPLC) for metabolite analysis.
- Quantitative assessment of 17 beta HSD (1-4) mRNA expression via RT-PCR.
Main Results:
- LNCaP and DU145 cells showed partial conversion of E2 to E1 and significant E2 production from E1.
- PC3 cells exhibited massive E2 oxidation to E1 and minimal E2 formation from E1.
- 16 alpha OHE1 was detected in PC3 and DU145 cells.
- All cell lines expressed 17 beta HSD4 mRNA; PC3 cells showed high 17 beta HSD2 mRNA levels.
- No 17 beta HSD1 or 17 beta HSD3 mRNA was detected in any cell line.
Conclusions:
- Estrogen metabolism pathways are distinctly regulated in human prostate cancer cells.
- Differential expression of 17 beta HSD enzyme mRNAs correlates with observed metabolic profiles.
- These findings highlight the heterogeneity of estrogen metabolism in prostate cancer and its potential therapeutic implications.