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Hormonal interactions in human prostate tumor LNCaP cells
1Department of Neurobiochemistry, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Israel.
The Journal of Steroid Biochemistry and Molecular Biology
|April 24, 1999
Summary
Melatonin directly inhibits growth of androgen-sensitive prostate tumor cells. Estradiol enhances melatonin
Area of Science:
- Endocrinology
- Oncology
- Cell Biology
Background:
- Melatonin, a pineal gland hormone, affects benign prostate cells.
- Estradiol's interaction with melatonin receptors involves protein kinase C.
- Androgen-sensitive prostate cancer cell lines offer a model for studying hormonal effects.
Purpose of the Study:
- To investigate melatonin's impact on LNCaP prostate cancer cell growth and viability.
- To determine how estradiol influences melatonin's effects on these cells.
- To explore the mechanisms underlying melatonin and estradiol interactions in prostate cancer.
Main Methods:
- Utilized LNCaP human prostate cancer cell line.
- Measured 3H-thymidine incorporation to assess DNA synthesis.
- Assessed DNA content and cell viability.
- Employed protein kinase C inhibitor GF-109203X.
Main Results:
- Melatonin inhibited 3H-thymidine incorporation in LNCaP cells at physiological concentrations.
- Estradiol's inhibitory effects on DNA synthesis were additive to melatonin's.
- Melatonin suppressed DNA content, an effect prolonged by estradiol.
- Both hormones additively decreased cell viability.
Conclusions:
- Melatonin directly attenuates growth of androgen-sensitive prostate tumor cells.
- Estradiol enhances, rather than inactivates, melatonin's growth-inhibitory action in LNCaP cells.
- These findings reveal a distinct interaction between melatonin and estradiol in prostate cancer compared to benign prostate cells.