Prostate-specific transcription factor hPSE is translated only in normal prostate epithelial cells

Area of Science:

• Molecular Biology
• Oncology
• Genetics

Background:

• The Ets gene family plays a role in cellular regulation.
• Identifying specific markers for prostate cancer is critical for early detection and treatment.

Purpose of the Study:

• To investigate the expression and translational regulation of the novel transcription factor gene, hPSE.
• To determine if hPSE protein can serve as a marker for distinguishing normal prostate cells from prostate carcinoma cells.

Main Methods:

• Cloning of the hPSE gene.
• Analysis of hPSE mRNA expression in prostate tissues and cell lines using RT-PCR.
• Immunoblot analysis to detect hPSE protein levels.
• Immunohistochemistry and in situ hybridization to localize hPSE protein and transcripts.
• Transfection analysis using deletion mutants of hPSE cDNA in HEK-293 cells.

Main Results:

• hPSE mRNA was detected in normal prostate glandular epithelial cells and prostate cancer cell lines (PC-3, LNCaP).
• hPSE protein was found only in normal prostate tissue, not in cancer cell lines.
• Immunohistochemistry and in situ hybridization showed hPSE protein translation occurred in normal cells but not in carcinoma cells, despite the presence of transcripts.
• Transfection analysis suggested the 5' and 3' untranslated regions of hPSE transcripts are involved in translational control.

Conclusions:

• hPSE expression in prostate epithelial cells is regulated at the translational level.
• hPSE protein is a potential diagnostic marker for differentiating normal prostate cells from prostate cancer cells.
• The untranslated regions of hPSE transcripts play a role in its translational regulation.