Abstract
Acute leukemias induced by MLL chimeric oncoproteins are among the subset of cancers distinguished by a paradoxical dependence on GSK-3 kinase activity for sustained proliferation. We demonstrate here that GSK-3 maintains the MLL leukemia stem cell transcriptional program by promoting the conditional association of CREB and its coactivators TORC and CBP with homedomain protein MEIS1, a critical component of the MLL-subordinate program, which in turn facilitates HOX-mediated transcription and transformation. This mechanism also applies to hematopoietic cells transformed by other HOX genes, including CDX2, which is highly expressed in a majority of acute myeloid leukemias, thus providing a molecular approach based on GSK-3 inhibitory strategies to target HOX-associated transcription in a broad spectrum of leukemias.
Copyright 2010 Elsevier Inc. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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CREB-Binding Protein / metabolism
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Cell Line, Tumor
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Cell Proliferation / drug effects
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Cell Transformation, Neoplastic / genetics*
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Cell Transformation, Neoplastic / metabolism
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Cyclic AMP Response Element-Binding Protein / genetics
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Cyclic AMP Response Element-Binding Protein / metabolism*
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DNA-Binding Proteins / metabolism
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Down-Regulation / genetics
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Gene Expression Profiling
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Gene Expression Regulation, Leukemic / physiology*
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Glycogen Synthase Kinase 3 / antagonists & inhibitors
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Glycogen Synthase Kinase 3 / genetics
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Glycogen Synthase Kinase 3 / metabolism*
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Homeodomain Proteins / genetics*
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Homeodomain Proteins / metabolism
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Humans
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Indoles / pharmacology
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Indoles / therapeutic use
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Leukemia, Myeloid, Acute / metabolism
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Leukemia, Myeloid, Acute / prevention & control
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Maleimides / pharmacology
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Maleimides / therapeutic use
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Mice
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Mice, Inbred C57BL
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Models, Biological
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Myeloid Ecotropic Viral Integration Site 1 Protein
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Myeloid-Lymphoid Leukemia Protein / genetics
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Neoplasm Proteins / genetics
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Neoplasm Proteins / metabolism*
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Neoplastic Stem Cells / cytology
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Neoplastic Stem Cells / drug effects
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Neoplastic Stem Cells / metabolism
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Oncogene Proteins, Fusion / genetics
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Phosphorylation / drug effects
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Phosphorylation / physiology
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Pre-B-Cell Leukemia Transcription Factor 1
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Protein Binding / drug effects
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Protein Binding / physiology
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Proto-Oncogene Proteins / metabolism
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Proto-Oncogene Proteins c-fos / genetics
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Proto-Oncogene Proteins c-fos / metabolism
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Signal Transduction / drug effects
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Signal Transduction / physiology
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Transcription Factors / genetics
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Transcription Factors / metabolism
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Transcription, Genetic / drug effects
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Transcription, Genetic / physiology*
Substances
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CRTC1 protein, human
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CRTC2 protein, human
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Cdx4 protein, mouse
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Cyclic AMP Response Element-Binding Protein
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DNA-Binding Proteins
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HOXB1 homeodomain protein
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Homeodomain Proteins
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Hoxb4 protein, mouse
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Indoles
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MEIS1 protein, human
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Maleimides
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Meis1 protein, mouse
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Myeloid Ecotropic Viral Integration Site 1 Protein
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Neoplasm Proteins
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Oncogene Proteins, Fusion
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Pbx1 protein, mouse
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Pre-B-Cell Leukemia Transcription Factor 1
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Proto-Oncogene Proteins
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Proto-Oncogene Proteins c-fos
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SB 216763
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Transcription Factors
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homeobox protein HOXA9
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PBX1 protein, human
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Myeloid-Lymphoid Leukemia Protein
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CREB-Binding Protein
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Glycogen Synthase Kinase 3