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Keratin profiles in normal/hyperplastic prostates and prostate carcinoma.
Virchows Archiv. A, Pathological Anatomy and Histopathology
|January 1, 1992
Summary
Prostate cancer cells primarily express luminal cell keratins, not basal cell keratins, aiding in diagnosis. This keratin profiling helps distinguish normal, benign, and malignant prostate epithelial cells.
Area of Science:
- Uro-oncology
- Cell biology
- Immunohistochemistry
Background:
- Prostate epithelial cells exhibit distinct keratin profiles in normal, hyperplastic, and cancerous tissues.
- Understanding these keratin phenotypes is crucial for accurate diagnosis and classification of prostate conditions.
Purpose of the Study:
- To investigate the keratin expression patterns in prostatic adenocarcinoma and compare them with normal/hyperplastic prostates.
- To determine if keratin profiles can differentiate between basal and luminal cell phenotypes in prostate cancer.
Main Methods:
- Methacarn-fixed, paraffin-embedded serial sections of 25 prostate adenocarcinomas and 10 normal/hyperplastic prostates were analyzed.
- A panel of nine anti-keratin monoclonal antibodies (mAbs) and one anti-actin mAb were used for immunohistochemical staining.
Main Results:
- Luminal cell-specific keratins (e.g., M20, 35 beta H11, CK5) were frequently expressed in prostate cancer cells (up to 92%).
- Basal cell-specific keratins (e.g., 34 beta E12, CK8.12, 312C8-1) were consistently negative in cancer cells.
- Anti-actin mAb (HHF35) showed no reactivity in any prostate epithelial cells.
Conclusions:
- Prostate adenocarcinomas predominantly display luminal cell keratin phenotypes.
- Keratin immunohistochemistry is valuable for identifying epithelial cell phenotypes in normal, benign, and malignant prostate conditions.
- The absence of basal cell keratin markers in cancer cells supports a luminal origin and rules out myoepithelial differentiation.