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Lysine-specific demethylase 1 (LSD1/KDM1A) is a histone demethylase and specifically catalyzes the demethylation of mono- and di-methylated histone H3 lysine 4 (H3K4). The LSD1-mediated demethylation of H3K4 promotes the assembly of the c-Myc-induced transcription initiation complex. Although LSD1 and c-Myc are both strongly expressed in human cancers, the mechanisms by which their activities are coordinated remain unclear. We herein demonstrated that LSD1 is a direct target gene of c-Myc. The knockdown of c-Myc decreased the expression of LSD1 in several cancer cell lines. We identified two non-canonical E-boxes in the proximal promoter region of the LSD1 gene. A chromatin immunoprecipitation assay showed that c-Myc bound to these E-boxes in the LSD1 promoter. Importantly, LSD1 mRNA expression correlated with c-Myc expression in human acute myeloid leukemia (AML), glioblastoma, stomach adenocarcinoma, and prostate adenocarcinoma. The present results suggest that LSD1 is induced by c-Myc and forms a positive feedback mechanism in transcription reactions by c-Myc.

Lysine-Specific Demethylase 1 (LSD1/KDM1A) Is a Novel Target Gene of c-Myc