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• W2080973982 abstract "Background: Loss of tumor suppressor CCAAT/enhancer-binding protein-α (C/EBPα) expression is seen in several human malignancies, including acute myelogenous leukemia and lung cancer. We hypothesized that DNA methylation and histone acetylation of the C/EBPα promoter may modulate C/EBPα expression in lung cancer. Methods: We analyzed C/EBPα expression in 15 human lung cancer cell lines and in 122 human lung primary tumors by northern blotting, immunoblotting, and immunohistochemistry. C/EBPα promoter methylation was assessed using bisulfite sequencing, combined bisulfite restriction analysis, methylation-specific polymerase chain reaction, and Southern blotting. We examined the acetylation status of histones H3 and H4 at the C/EBPα promoter by chromatin immunoprecipitation. Binding of methyl-CpG–binding proteins MeCP2 and MBD2 and upstream stimulatory factor (USF) to the C/EBPα promoter was assayed in cell lines that were untreated or treated with histone deacetylase inhibitor trichostatin A and demethylating agent 5-aza-2′-deoxycytidine (5-aza-dC) by chromatin immunoprecipitation and by electrophoretic mobility shift assays. Results: DNA methylation and histone acetylation in the upstream region (−1422 to −896) of the C/EBPα promoter were associated with low or absent C/EBPα expression in 12 of 15 lung cancer cell lines and in 81 of 120 primary lung tumors. MeCP2 and MBD binding to the upstream C/EBPα promoter was detected in C/EBPα-nonexpressing cell lines; USF binding was detected in C/EBPα-expressing cell lines; however, in C/EBPα-nonexpressing cell lines USF binding was detected only after trichostatin A and 5-aza-dC treatment. Conclusions: DNA hypermethylation of the upstream C/EBPα promoter region, not the core promoter region as previously reported, is critical in the regulation of C/EBPα expression in human lung cancer." @default.
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• W2080973982 date "2006-03-15" @default.
• W2080973982 modified "2023-10-11" @default.
• W2080973982 title "Epigenetic Modulation of Tumor Suppressor CCAAT/Enhancer Binding Protein α Activity in Lung Cancer" @default.
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• W2080973982 doi "https://doi.org/10.1093/jnci/djj093" @default.
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