Cited by 72Cytokine Signaling Pathways and Interactionsinterferon and immune responsesGenomics and Chromatin Dynamics

IFN consensus sequence binding protein potentiates STAT1-dependent activation of IFNγ-responsive promoters in macrophages

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Contursi, Cristina, Wang, I-Ming, Gabriele, Lucia, Gadina, Massimo, O'Shea, John, Morse, Herbert C., Ozato, Keiko·2000·Proceedings of the National Academy of Sciences

Abstract

IFNγ, once called the macrophage-activating factor, stimulates many genes in macrophages, ultimately leading to the elicitation of innate immunity. IFNγ's functions depend on the activation of STAT1, which stimulates transcription of IFNγ-inducible genes through the GAS element. The IFN consensus sequence binding protein ( icsb γ or IFN regulatory factor 8), encoding a transcription factor of the IFN regulatory factor family, is one of such IFNγ-inducible genes in macrophages. We found that macrophages from ICSBP−/− mice were defective in inducing some IFNγ-responsive genes, even though they were capable of activating STAT1 in response to IFNγ. Accordingly, IFNγ activation of luciferase reporters fused to the GAS element was severely impaired in ICSBP−/− macrophages, but transfection of ICSBP resulted in marked stimulation of these reporters. Consistent with its role in activating IFNγ-responsive promoters, ICSBP stimulated reporter activity in a GAS-specific manner, even in the absence of IFNγ treatment, and in STAT1 negative cells. Indicative of a mechanism for this stimulation, DNA affinity binding assays revealed that endogenous ICSBP was recruited to a multiprotein complex that bound to GAS. These results suggest that ICSBP, when induced by IFNγ through STAT1, in turn generates a second wave of transcription from GAS-containing promoters, thereby contributing to the elicitation of IFNγ's unique activities in immune cells.

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Crossref · 10.1073/pnas.97.1.91

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  • ICSBP/IRF-8 is an IFN-γ-inducible transcription factor of the IRF family that regulates transcription through multiple target DNA elements, including ISRE, EICE, and GAS.

    “Interferon (IFN) consensus sequence binding protein (ICSBP)/IFN regulatory factor (IRF)-8 is an IFN g -inducible transcription factor of the IRF family and regulates transcription through multiple target DNA elements, such as IFN-stimulated response element (ISRE), Ets/IRF composite element, and IFNg activation site (GAS).”
  • ICSBP can act on a wide range of target elements beyond the IRS, such as the Ets site in the IL-12 p40 promoter and the IFN-γ activation site (GAS).

    “Recent studies indicate that ICSBP can act on a wide range of target elements even beyond the IRS, such as the Ets site in IL-12 p40 promoter and the IFNg activation site (GAS). (15,34)”
  • ICSBP-/- mice have defects in macrophage function, including the ability to induce IL-12 p40 and some IFN-γ-responsible genes.

    “They have defects in the macrophage function, including the ability to induce interleukin-12 (IL-12) p40 and some IFNg -responsible genes.”
  • ICSBP potentiates activation of GAS in macrophages, and ICSBP-/- macrophages are defective in inducing some IFN-γ-responsive genes such as FcγRI and iNOS but are capable of activating Stat1 in response to IFN-γ.

    “A recent study suggests that ICSBP potentiates activation of GAS in macrophages. (34)”

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Research works printed but not linked: 6

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Authors
Contursi, C., Wang, I.-M., Gabriele, L., Gadina, M., O'Shea, J., Morse, H. C., & Ozato, K.
Affiliations
  • National Institutes of Health (US)
  • Laboratory of Molecular Growth Regulation, National Institute of Child Health and Human Development, Laboratory of Immunopathology, National Institute of Allergy and Infectious Diseases, and Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal Diseases, National Institutes of Health, Bethesda, MD 20892
Venue
Proceedings of the National Academy of Sciences
Published
2000-01-04
Volume
97
Issue
1
Pages
91-96
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2034779553
Cited by
72
References
40
Citations by year
2026: 1 · 2024: 2 · 2023: 1 · 2022: 1 · 2021: 5 · 2020: 1 · 2018: 1 · 2017: 2 · 2015: 2 · 2014: 2 · 2013: 2 · 2012: 2
FWCI
4.12
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
IRF8, STAT1, interferon-gamma, macrophages, transcriptional activation, innate immunity, transcriptional regulation
MeSH terms
Interferon Regulatory Factor-8, Animals, Cell Line, DNA-Binding Proteins, Humans, Interferon-gamma, Macrophages, Promoter Regions, Genetic, Repressor Proteins, Transfection, Transcriptional Activation, Trans-Activators, Genes, Reporter, Mice, Knockout, Reverse Transcriptase Polymerase Chain Reaction, STAT1 Transcription Factor, Interferon Regulatory Factors, Mice

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