Cited by 94Genomics and Chromatin DynamicsAcute Myeloid Leukemia ResearchRetinoids in leukemia and cellular processes

Core Binding Factor Cannot Synergistically Activate the Myeloperoxidase Proximal Enhancer in Immature Myeloid Cells without c-Myb

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Britos-Bray, Martin, Friedman, Alan D.·1997·Molecular and Cellular Biology

Abstract

The myeloperoxidase (MPO) gene is transcribed specifically in immature myeloid cells and is regulated in part by a 414-bp proximal enhancer. Mutation of a core binding factor (CBF)-binding site at -288 decreased enhancer activity 30-fold in 32D cl3 myeloid cells cultured in granulocyte colony-stimulating factor (G-CSF). A novel functional analysis, linking the CBF-binding site to an enhancer deletion series, located at -147 an evolutionarily conserved c-Myb-binding site which was required for optimal enhancer activity and synergy with CBF in 32D cells. These sites cooperated in isolation and independent of a precise spacing. Deletional analysis carried out in the absence of the c-Myb-binding site at -147 located at -301 a second c-Myb-binding site which also synergized with CBF to activate the enhancer. A GA-rich region at -162 contributed to cooperation with CBF when the adjacent c-Myb-binding site was intact. Mutation of both c-Myb-binding sites in the context of the entire enhancer greatly impaired activation by endogenous CBF in 32D cells. Similarly, activation by c-Myb was impaired in constructs lacking the CBF-binding site. CBF and c-Myb were required for induction of MPO proximal enhancer activity when 32D cells differentiated in response to G-CSF. A fusion protein containing the Gal4 DNA-binding domain and the AML-1B activation domain, amino acids 216 to 480, activated transcription alone and cooperatively with c-Myb in nonmyeloid CV-1 cells. Determining how CBF and c-Myb synergize in myeloid cells might contribute to our understanding of leukemogenesis by the AML1-ETO, AML1-MDS1, CBFbeta-SMMHC, and v-Myb oncoproteins.

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  • The region from amino acids 1 to 317 is important for synergy between AML1 and c-Myb.

    “a region important for synergy between AML1 and c-Myb (6)”

    From Multiple Functional Domains of AML1: PU.1 and C/EBPα Synergize with Different Regions of AML1 (1998) · cites this paper as [6]

    The Discussion (page unavailable) identifies AML-1B regions 216–289 and 278–480 as required for optimal cooperation with c-Myb, while saying its DNA-binding domain is dispensable. This supports the importance of part of amino acids 1–317, but not that the specified 1–317 region as a whole is the region required for synergy; the paper also identifies a required segment extending beyond residue 317. (LLM, conf=0.85)

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  • The myeloid-specific expression of neutrophil elastase, M-CSF receptor, and myeloperoxidase is mainly controlled through the concerted and synergistic action of RUNX1 with factors such as Myb, PU.1, and C/EBP, which bind closely located elements on their respective promoter regions.

    “The myeloid-specific expression of the neutrophil elastase, 58 M-CSF receptor, 29,30 and myeloperoxidase 27 is mainly controlled through the concerted and synergistic action of RUNX1 with factors such as Myb, PU.1, and C/EBP, which bind closely located elements on their respective promoter regions.”

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  1. Ford, A. M., C. A. Bennett, L. E. Healy, M. Towatari, M. F. Greaves, and T. Enver. 1996. Regulation of the myeloperoxidase enhancer binding proteins PU.1, C/EBP␣, ␤, and ␦ during granulocyte-lineage specification. Proc. Natl. Acad. Sci. USA 93:10838-10843.

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Authors
Britos-Bray, M., & Friedman, A. D.
Affiliations
Johns Hopkins University (US)
Corresponding author
Friedman, Alan D.
Venue
Molecular and Cellular Biology
Published
1997-09
Volume
17
Issue
9
Pages
5127-5135
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2152668799
Cited by
94
References
47
Citations by year
2017: 1 · 2016: 1 · 2015: 1 · 2014: 1 · 2012: 3
FWCI
2.96
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R01 HL15388)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Health Sciences › Medicine › Hematology › Acute Myeloid Leukemia Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinoids in leukemia and cellular processes
Keywords
myeloperoxidase, core binding factor, MYB, transcriptional synergy, enhancer activation, immature myeloid cells, 32D cells, RUNX1, AML1-ETO, leukemogenesis, transcription factor binding sites
MeSH terms
Animals, Base Sequence, Binding Sites, Cell Differentiation, Cells, Cultured, DNA-Binding Proteins, Enhancer Elements, Genetic, Enzyme Activation, Hematopoietic Stem Cells, Molecular Sequence Data, Peroxidase, Neoplasm Proteins, Proto-Oncogene Proteins, Transcription Factors, Transcription, Genetic, Trans-Activators, Proto-Oncogene Proteins c-myb, Core Binding Factors, Mice

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