Translational Control of Putative Protooncogene Nm23-M2 by Cytokines via Phosphoinositide 3-Kinase Signaling

The expansion and differentiation of hematopoietic progenitors is regulated by cytokine and growth factor signaling. To examine how signal transduction controls the gene expression program required for progenitor expansion, we screened ATLAS filters with polysome-associated mRNA derived from erythro...

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Veröffentlicht in:The Journal of biological chemistry 2004-09, Vol.279 (37), p.38169-38176
Hauptverfasser: Joosten, Marieke, Blázquez-Domingo, Montserrat, Lindeboom, Fokke, Boulmé, Florence, Van Hoven-Beijen, Antoinette, Habermann, Bianca, Löwenberg, Bob, Beug, Hartmut, Müllner, Ernst W., Delwel, Ruud, Von Lindern, Marieke
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container_end_page 38176
container_issue 37
container_start_page 38169
container_title The Journal of biological chemistry
container_volume 279
creator Joosten, Marieke
Blázquez-Domingo, Montserrat
Lindeboom, Fokke
Boulmé, Florence
Van Hoven-Beijen, Antoinette
Habermann, Bianca
Löwenberg, Bob
Beug, Hartmut
Müllner, Ernst W.
Delwel, Ruud
Von Lindern, Marieke
description The expansion and differentiation of hematopoietic progenitors is regulated by cytokine and growth factor signaling. To examine how signal transduction controls the gene expression program required for progenitor expansion, we screened ATLAS filters with polysome-associated mRNA derived from erythroid progenitors stimulated with erythropoietin and/or stem cell factor. The putative proto-oncogene nucleoside diphosphate kinase B (ndpk-B or nm23-M2) was identified as an erythropoietin and stem cell factor target gene. Factor-induced expression of nm23-M2 was regulated specifically at the level of polysome association by a phosphoinositide 3-kinase-dependent mechanism. Identification of the transcription initiation site revealed that nm23-M2 mRNA starts with a terminal oligopyrimidine sequence, which is known to render mRNA translation dependent on mitogenic factors. Recently, the nm23-M2 locus was identified as a common leukemia retrovirus integration site, suggesting that it plays a role in leukemia development. The expression of Nm23 from a retroviral vector in the absence of its 5′-untranslated region caused constitutive polysome association of nm23-M2. Polysome-association and protein expression of endogenous nm23-M2 declined during differentiation of erythroid progenitors, suggesting a role for Nm23-M2 in progenitor expansion. Taken together, nm23-m2 exemplifies that cytokine-dependent control of translation initiation is an important mechanism of gene expression regulation.
doi_str_mv 10.1074/jbc.M401283200
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To examine how signal transduction controls the gene expression program required for progenitor expansion, we screened ATLAS filters with polysome-associated mRNA derived from erythroid progenitors stimulated with erythropoietin and/or stem cell factor. The putative proto-oncogene nucleoside diphosphate kinase B (ndpk-B or nm23-M2) was identified as an erythropoietin and stem cell factor target gene. Factor-induced expression of nm23-M2 was regulated specifically at the level of polysome association by a phosphoinositide 3-kinase-dependent mechanism. Identification of the transcription initiation site revealed that nm23-M2 mRNA starts with a terminal oligopyrimidine sequence, which is known to render mRNA translation dependent on mitogenic factors. Recently, the nm23-M2 locus was identified as a common leukemia retrovirus integration site, suggesting that it plays a role in leukemia development. The expression of Nm23 from a retroviral vector in the absence of its 5′-untranslated region caused constitutive polysome association of nm23-M2. Polysome-association and protein expression of endogenous nm23-M2 declined during differentiation of erythroid progenitors, suggesting a role for Nm23-M2 in progenitor expansion. 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The expression of Nm23 from a retroviral vector in the absence of its 5′-untranslated region caused constitutive polysome association of nm23-M2. Polysome-association and protein expression of endogenous nm23-M2 declined during differentiation of erythroid progenitors, suggesting a role for Nm23-M2 in progenitor expansion. 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subjects 5' Untranslated Regions
Animals
Base Sequence
Blotting, Northern
Cell Differentiation
Cells, Cultured
Cloning, Molecular
DNA Primers - chemistry
DNA, Complementary - metabolism
Down-Regulation
Erythropoietin - metabolism
Gene Deletion
Gene Expression Regulation
Gene Expression Regulation, Enzymologic
Genetic Vectors
Mice
Molecular Sequence Data
NM23 Nucleoside Diphosphate Kinases
Nucleic Acid Conformation
Nucleoside-Diphosphate Kinase - genetics
Nucleoside-Diphosphate Kinase - metabolism
Oligonucleotide Array Sequence Analysis
Phosphatidylinositol 3-Kinases - metabolism
Poly A - metabolism
Polyribosomes - metabolism
Protein Biosynthesis
Pyrimidines - chemistry
Retroviridae - genetics
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - metabolism
Signal Transduction
Stem Cell Factor - metabolism
Time Factors
Up-Regulation
title Translational Control of Putative Protooncogene Nm23-M2 by Cytokines via Phosphoinositide 3-Kinase Signaling
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