Active estrogen synthesis and its function in prostate cancer-derived stromal cells

Area of Science:

• Endocrinology
• Cancer Biology
• Molecular Oncology

Background:

• The role and production of estrogen in prostate cancer (PCa) remain largely unknown.
• Investigating estrogen's presence and function in PCa is crucial for understanding disease progression.

Purpose of the Study:

• To determine if prostate cancer cells produce estrogen.
• To elucidate the mechanism by which estrogen influences PCa cell growth.

Main Methods:

• Co-culture of prostate cancer-derived stromal cells (PCaSC) with LNCaP cells and measurement of estrogen via LC-MS/MS.
• Real-time PCR to confirm aromatase (CYP19) mRNA expression.
• Co-culture with estrogen receptor-reporter breast cancer cells to detect estrogen synthesis from testosterone.

Main Results:

• PCaSC metabolize testosterone into active estrogen.
• Estrogen produced by PCaSC activates estrogen receptors in breast cancer cells.
• Estrogen synthesized by PCaSC regulates PC-3 cell proliferation by repressing growth factor secretion.

Conclusions:

• Chimeric co-culture models demonstrate active estrogen production in PCaSC.
• High-dose testosterone therapy presents a potential novel strategy for treating castration-resistant prostate cancer (CRPC).