trichostatin-a and Chromosome-Inversion

Acute myeloid leukemia (AML) is a heterogeneous group of disorders characterized by an abnormal proliferation of the myeloid precursors and a maturation block. The most common chromosomal lesions in AML are the t(8;21) and inv(16). To better understand the leukemogenic mechanism of these fusion proteins, we performed gene expression studies in samples from (8;21), AML1 mutated and inv(16) patients, as well as from the Kasumi-1 cell line and a U937 cell line expressing the AML1-ETO fusion gene. To assess the influence of associated epigenetic lesions, we performed gene expression studies in Kasumi-1 cells and cells extracted from an Inv(16) patient, both treated with demethylating and HDAC inhibitor agents. Shared deregulated genes in the different types of core-binding factor leukemias were identified. We found a tight link between Inv(16) and mutant AML1 samples. Furthermore, some of the genes deregulated by the leukemogenic process reverted to their normal expression with demethylating and HDAC inhibitor treatment, highlighting the role of chromatin remodeling processes in AML.

Topics: Adult; Azacitidine; Biomarkers, Tumor; Chromatin Assembly and Disassembly; Chromosome Inversion; Chromosomes, Human, Pair 16; Chromosomes, Human, Pair 21; Chromosomes, Human, Pair 8; Core Binding Factor Alpha 2 Subunit; Decitabine; DNA Methylation; DNA Modification Methylases; Enzyme Inhibitors; Epigenesis, Genetic; Gene Expression Profiling; Gene Expression Regulation, Leukemic; Histone Deacetylase Inhibitors; Humans; Hydroxamic Acids; Leukemia, Myeloid, Acute; Mutation; Oligonucleotide Array Sequence Analysis; Oncogene Proteins, Fusion; Promoter Regions, Genetic; Reverse Transcriptase Polymerase Chain Reaction; RNA, Messenger; RUNX1 Translocation Partner 1 Protein; Translocation, Genetic; Tumor Cells, Cultured; U937 Cells