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The zinc finger transcription factor ZBP-89 is a repressor of the human β2-integrin CD11b gene

Park, Heiyoung, Shelley, C. Simon, Arnaout, M. Amin·2003·Blood
DOI 10.1182/blood-2002-03-0680
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Abstract

Integrin CD11b is a differentiation marker of the myelomonocytic lineage and an important mediator of inflammation. Expression of theCD11b gene is transcriptionally induced as myeloid precursors differentiate into mature cells, then drops as monocytes further differentiate into macrophages. Previous studies have identified elements and factors involved in the transcriptional activation of the CD11b gene during myeloid differentiation, but no data exist regarding potential down-regulatory factors, especially in the later stages of differentiation. Using 2 copies of a GC-rich element (−141 to −110) in the CD11bpromoter, we probed a cDNA expression library for interacting proteins. Three clones were identified among 9.1 million screened, all encoding the DNA-binding domain of the zinc finger factor ZBP-89. Overexpression of ZBP-89 in the monocyte precursor cell line U937 reducedCD11b promoter-driven luciferase activity when U937 cells were induced to differentiate into monocytelike cells using phorbol esters. To identify the differentiation stage at which ZBP-89 repression of the CD11b gene is exerted, the protein level of ZBP-89 was correlated with that of CD11b mRNA in differentiating U937 as well as in normal human monocytes undergoing in vitro differentiation into macrophages. A clear inverse relationship was observed in the latter but not the former state, suggesting that ZBP-89 represses CD11b gene expression during the further differentiation of monocytes into macrophages.

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Metadata

Authors
Park, H., Shelley, C. S., & Arnaout, M. A.
Affiliations
From the Leukocyte Biology and Inflammation Program, Renal Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
Venue
Blood
Publisher
American Society of Hematology
Published
2003-02-01
Volume
101
Issue
3
Pages
894-902
ISSN
  • 1528-0020
  • 0006-4971
DOI
10.1182/blood-2002-03-0680
Cited by
26
References
3
Language
en

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CoChat. (2026). Citation check: The zinc finger transcription factor ZBP-89 is a repressor of the human β2-integrin CD11b gene. https://app.cochat.ai/papers/10.1182/blood-2002-03-0680
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Park, H., Shelley, C. S., & Arnaout, M. A. (2003). The zinc finger transcription factor ZBP-89 is a repressor of the human β2-integrin CD11b gene. Blood. https://doi.org/10.1182/blood-2002-03-0680