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Phenotypic and genotypic characterization of commonly used human prostatic cell lines
1Departments of Pathology and Surgery, Imperial College of Science, Technology and Medicine, Hammersmith Campus, London, UK.
BJU International
|May 3, 2000
Summary
This study developed a unique genotypic and phenotypic fingerprint for common prostate cancer cell lines. This characterization allows for more accurate comparisons between cell lines used in research globally.
Area of Science:
- Molecular biology and cell line characterization
- Prostate cancer research
Background:
- Standardized characterization of prostate cell lines is crucial for reproducible research.
- Existing cell line data may lack comprehensive phenotypic and genotypic profiles.
Purpose of the Study:
- To systematically catalogue phenotypic and genotypic characteristics of common prostate cell lines.
- To establish a unique 'fingerprint' for each cell line using immunocytochemistry and PCR.
- To enable reliable comparisons of cell lines across different laboratories.
Main Methods:
- Utilized immunocytochemistry with 23 antibodies against cytoskeletal elements, MUC1, cell adhesion molecules, and prostate-specific antigens (PSA, PAP, AR).
- Employed Polymerase Chain Reaction (PCR) to analyze hypervariable genomic sequences, including AR exon 1 (CAG repeat polymorphism) and microsatellite instability (MSI) regions in AR exon 8 and HPRT exon 3.
- Analyzed malignant (LNCaP, LNCaP-r, PC-3, DU-145) and benign immortalized (PNT-1A, PNT-1B, BPH-1) prostate cell lines.
Main Results:
- All cell lines expressed CK-8/18; most also showed CK-7 and CK-19. CK-20 expression was heterogeneous, noted for the first time in prostate cell lines.
- PSA, PAP, and AR were exclusively expressed by LNCaP and LNCaP-r. MUC1 was found in DU-145 and all immortalized lines. E-cadherin was low/absent in PNT1A, PNT1B, and PC-3.
- PCR analysis revealed distinct CAG repeat lengths in AR exon 1 and sequence variations in AR exon 8, allowing differentiation of most cell lines. No generalized MSI was detected.
Conclusions:
- Prostate cell lines were categorized into three phenotypic groups: prostate marker-positive, high antigen expression, and low/absent antigen expression.
- A combination of genotypic (AR exon 1 and 8 sequences) and phenotypic markers provided a unique 'fingerprint' for each cell line.
- This comprehensive fingerprinting facilitates accurate comparisons and validation of results obtained from similar cell lines used in different research settings.