Differential cytokeratin expression in normal, hyperplastic and malignant epithelial cells from human prostate

Area of Science:

• Urology
• Cell Biology
• Biochemistry

Background:

• Cytokeratins (CKs) are intermediate filament proteins crucial for epithelial cell structure.
• CK expression patterns vary across different tissues and can change during cellular differentiation and disease.
• Understanding CK profiles in the prostate is essential for diagnosing and differentiating benign from malignant conditions.

Purpose of the Study:

• To comprehensively define the expression profiles of cytokeratins in normal, hyperplastic (BPH), and malignant human prostate epithelial cells.
• To identify novel CK markers, such as CK 15, in prostate tissues.
• To investigate alterations in CK expression in cultured BPH cells compared to in situ tissue.

Main Methods:

• Two-dimensional electrophoresis was used to separate cytokeratin polypeptides.
• Immunoblotting with CK-specific monoclonal antibodies identified specific CKs.
• Primary prostate epithelial cells and established cancer cell lines (PC3, DU145, LNCAP) were analyzed.

Main Results:

• CKs 5, 7, 8, 15, 18, and 19 were detected in normal and hyperplastic prostate tissues; CK 15 expression is newly reported.
• Cultured BPH cells exhibited altered CK expression, including CKs 6, 14, 16, and 17, not found in fresh tissue.
• Prostate cancer cell lines predominantly expressed CKs 8 and 18, differing from benign prostate CK profiles.

Conclusions:

• Cytokeratin expression patterns differ significantly between normal, hyperplastic, and malignant prostate epithelial cells.
• CK profiling provides valuable insights for distinguishing between benign and cancerous prostate conditions.
• The identified CK differences may serve as diagnostic markers for prostate cancer and BPH.