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Expression of Phosphatase and Tensin Homologue, phospho-Akt, and p53 in Acral Benign and Malignant Melanocytic Neoplasms (Benign Nevi, Dysplastic Nevi, and Acral Melanomas)
- Expression of Phosphatase and Tensin Homologue, phospho-Akt, and p53 in Acral Benign and Malignant Melanocytic Neoplasms (Benign Nevi, Dysplastic Nevi, and Acral Melanomas)
- Lyu, So Min; Wu, Ju Yeon; Byun, Ji Yeon; Choi, Hae Young; Park, Sang Hee; Choi, You Won
- Ewha Authors
- 최혜영; 최유원; 박상희; 변지연
- SCOPUS Author ID
- 최혜영; 최유원; 박상희; 변지연
- Issue Date
- Journal Title
- ANNALS OF DERMATOLOGY
- vol. 28, no. 5, pp. 548 - 554
- Acral; Akt; Melanocytic; p53; PTEN
- KOREAN DERMATOLOGICAL ASSOC
- SCIE; SCOPUS; KCI
- Background: The role of the phosphatidylinositol-3 kinase signaling pathway in the development of acral melanoma has recently gained evidence. Phosphatase and tensin homologue (PTEN), one of the key molecules in the pathway, acts as a tumor suppressor through either an Akt-dependent or Akt-independent pathway. Akt accelerates degradation of p53. Objective: We assessed the expression of PTEN, phospho-Akt (p-Akt), and p53 by immunohistochemistry in benign acral nevi, acral dysplastic nevi, and acral melanomas in the radial growth phase and with a vertical growth component. Methods: Ten specimens in each group were included. Paraffin-embedded specimens were immunostained with antibodies for PTEN, p-Akt, and p53. We scored both the staining intensity and the proportion of positive cells. The final score was calculated by multiplying the intensity score by the proportion score. Results: All specimens of benign acral nevi except one showed some degree of PTEN-negative cells. The numbers of p-Akt and p53-positive cells were higher in acral dysplastic nevi and melanoma than in benign nevi. P-Akt scores were 1.7, 1.8, 2.6, and 4.4, and p53 scores were 2.0, 2.1, 3.8, and 4.1 in each group. PTEN and p-Akt scores in advanced acral melanoma were higher than in the other neoplasms. Conclusion: The expression of PTEN was decreased and the expression of p-Akt was increased in acral melanoma, especially in advanced cases. The PTEN-induced pathway appears to affect the late stage of melano-magenesis. Altered expression of p-Akt is thought to be due to secondary changes following the loss of PTEN.
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