Cited by 351Cytokine Signaling Pathways and InteractionsGenomics and Chromatin Dynamicsinterferon and immune responses

Roles of unphosphorylated STATs in signaling

Open access
Yang, Jinbo, Stark, George R·2008·Cell Research

Abstract

The seven members of the signal transducer and activator of transcription (STAT) family of transcription factors are activated in response to many different cytokines and growth factors by phosphorylation of specific tyrosine residues. The STAT1 and STAT3 genes are specific targets of activated STATs 1 and 3, respectively, resulting in large increases in the levels of these unphosphorylated STATs (U-STATs) in response to the interferons (STAT1) or ligands that active gp130, such as IL-6 (STAT3). U-STATs drive gene expression by novel mechanisms distinct from those used by phosphorylated STAT (P-STAT) dimers. In this review, we discuss the roles of U-STATs in transcription and regulation of gene expression.

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Crossref · 10.1038/cr.2008.41

Cites

87 of 87 references verified0 citation errors · 0 not checkable

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  • Nonpeptidic tyrosine kinase-targeted inhibitors have diminished efficacy because the inherent transcriptional activity of unphosphorylated STAT3 can drive MET and MRAS by binding NF-κB.

    “However, their efficacy is diminished because the inherent transcriptional activity of unphosphorylated STAT3 could also drive the expression of oncogenes such as MET and MRAS by binding to NF-κB (18–21).”

    From Small-molecule PROTAC mediates targeted protein degradation to treat STAT3-dependent epithelial cancer (2022) · cites this paper as [19]

    In “The biology of U-STATs” (page unavailable), the paper says increased unphosphorylated STAT3 is likely to drive expression of MET and MRAS. “STAT3-dependent gene expression” describes its interaction with NF-κB, but demonstrates that mechanism for RANTES, not specifically MET or MRAS. The cited passages do not establish that this activity diminishes the efficacy of tyrosine kinase-targeted inhibitors. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Targeted STAT3 degradation can completely inhibit the transcriptional activity of both dimerized and monomeric STAT3.

    “Second, the targeted STAT3 degradation can completely inhibit the transcriptional activity of both dimerized and monomeric STAT3 (19, 21, 26).”

    From Small-molecule PROTAC mediates targeted protein degradation to treat STAT3-dependent epithelial cancer (2022) · cites this paper as [19]

    The STAT3-dependent gene expression section (page not provided) describes transcriptional roles for STAT3 homodimers and unphosphorylated STAT3. It does not address targeted STAT3 degradation or show that degradation completely inhibits either activity. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • One major reason for ineffectiveness of STAT3 dimerization inhibitors is that monomeric STAT3 also has transcriptional activity.

    “One major reason for their ineffectiveness is that monomeric STAT3 also has transcriptional activity [175].”

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Cites

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Research works printed but not linked: 2

  1. Bromberg JF. Activation of STAT proteins and growth control. Bioessays 2001; 23:161-169.
  2. Boudny V, Dusek L, Adamkova L, et al. Lack of STAT1 phos- phorylation at TYR701 by IFNgamma correlates with disease outcome in melanoma patients. Neoplasma 2005; 52:330-337.

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Authors
Yang, J., & Stark, G. R.
Affiliations
  • Lanzhou University (CN)
  • Cleveland Clinic (US)
Corresponding author
  • Yang, Jinbo
  • Stark, George R
Venue
Cell Research
Published
2008-03-25
Volume
18
Issue
4
Pages
443-451
ISSN
  • 1001-0602 (ISSN-L)
  • 1748-7838
OpenAlex
W2079870321
Cited by
347
References
87
Citations by year
2026: 3 · 2025: 7 · 2024: 16 · 2023: 16 · 2022: 18 · 2021: 14 · 2020: 19 · 2019: 16 · 2018: 12 · 2017: 16 · 2016: 15 · 2015: 21 · 2014: 36 · 2013: 34 · 2012: 35
FWCI
2.18
Type
journal article
Language
en
Open access
Locations
  • Cell Research (publishedVersion)
  • PubMed (publishedVersion)
  • Lanzhou University Institutional Repository (submittedVersion, cc-by-nc)
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
Keywords
STAT1, STAT3, STAT family, tyrosine phosphorylation, interferon signaling, gp130 signaling, interleukin-6, cytokine signaling, transcriptional regulation, gene expression regulation
MeSH terms
Animals, DNA, Gene Expression Regulation, Humans, Phosphorylation, Signal Transduction, Protein Transport, STAT Transcription Factors

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