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  • Title: Aberrant DNA methylation silences the novel heat shock protein H11 in melanoma but not benign melanocytic lesions.
    Author: Sharma BK, Smith CC, Laing JM, Rucker DA, Burnett JW, Aurelian L.
    Journal: Dermatology; 2006; 213(3):192-9. PubMed ID: 17033167.
    Abstract:
    BACKGROUND: The heat shock protein H11 is silenced in melanoma cell lines, where its forced expression by demethylation with Aza-C triggers apoptosis. OBJECTIVE: To examine whether H11 is silenced by aberrant DNA methylation in melanoma as compared to nevi and normal skin tissues. METHODS: Cell suspensions from benign intradermal nevi, atypical nevi and malignant melanoma tissues were used in reverse-transcriptase PCR and methylation-specific PCR. Paraffin-embedded tissues were stained with H11 antibody. RESULTS: H11 is methylated in 60-75% of melanoma and atypical nevi, but not in normal skin or most benign nevi. Methylation is inversely correlated with H11 expression. CONCLUSION: The heat shock protein H11 is silenced by aberrant DNA methylation in melanoma, but not benign melanocytic lesions or normal skin melanocytes. The data suggest that H11 is a promising target for the molecular therapy of melanoma.
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