Cited by 50interferon and immune responsesImmune Response and InflammationCytokine Signaling Pathways and Interactions

IFN consenus sequence binding protein (ICSBP) is a conditional repressor of IFN inducible promoters

Welsz, Anat, Kirchhoff, Sabine, Levi, Ben-Zion·1994·International Immunology

Abstract

IFN stimulated genes (ISGs) contain common DNA motif termed IFN consensus sequence (ICS) at their promoters that enable IFN responsiveness. Different transcription factors capable of interacting with the ICS have been described. Previously, we reported the cloning of a factor capable of binding to the ICS (ICSBP) that demonstrates similarity at DNA the binding domain with three other ICS binding factor, i.e. IRF-1, IRF-2 and ISGF3 gamma. ICSBP is expressed constitutively in hematopoietic cells and its expression is further induced by IFN-gamma. This is a negative trans-acting regulator of ISGs; however, its effect is attenuated following prolonged exposures of cells to both types of IFNs. In this communication, we show that short exposures of cells to IFNs (priming) are sufficient to alleviate ICSBP mediated repression. Further, exposure of primed cells to the synthetic dsRNA (polyl-polyC) results in total abrogation of ICSBP repression. In an attempt to unravel the molecular mechanism governing this conditional repression of ICSBP, the direct involvement of transcriptional activator IRF-1 is demonstrated. We postulate that constitutive expression of ICSBP in hematopoietic cells is mediating submaximal expression of ISGs such as MHC class I. Our data demonstrate that IRF-1 competes with ICSBP for the binding to the ISRE element, resulting in the alleviation of ICSBP repression. Thus, the magnitude of ISGs expression is a result of a fine balance between positive and negative regulators.

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Crossref · 10.1093/intimm/6.8.1125

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Authors
Welsz, A., Kirchhoff, S., & Levi, B.-Z.
Affiliations
  • Technion – Israel Institute of Technology (IL)
  • Helmholtz Centre for Infection Research (DE)
Corresponding author
Levi, Ben-Zion
Venue
International Immunology
Published
1994
Volume
6
Issue
8
Pages
1125-1131
ISSN
  • 0953-8178 (ISSN-L)
  • 1460-2377
OpenAlex
W2155528120
Cited by
50
References
0
Citations by year
2024: 1 · 2022: 1 · 2021: 1 · 2014: 1 · 2013: 1
FWCI
0.76
Type
journal article
Language
en
Open access
closed
Locations
  • International Immunology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
Keywords
IRF8, interferon-stimulated genes, IRF1, IRF2, transcriptional repression, interferon-gamma, double-stranded RNA, MHC class I expression, hematopoietic cells, transcription factor competition
MeSH terms
Interferon Regulatory Factor-8, Carrier Proteins, DNA-Binding Proteins, HeLa Cells, Humans, Interferons, Phosphoproteins, Poly I-C, Promoter Regions, Genetic, Repressor Proteins, RNA, Double-Stranded, Transcription Factors, Transfection, Chloramphenicol O-Acetyltransferase, Antisense Elements (Genetics), Interferon Regulatory Factors, Interferon Regulatory Factor-1

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