Cited by 199Cytokine Signaling Pathways and InteractionsProtein Tyrosine PhosphatasesProtein Kinase Regulation and GTPase Signaling

A novel small-molecule disrupts Stat3 SH2 domain–phosphotyrosine interactions and Stat3-dependent tumor processes

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Zhang, Xiaolei, Yue, Peibin, Fletcher, Steven, Zhao, Wei, Gunning, Patrick T., Turkson, James·2010·Biochemical Pharmacology

Abstract

The molecular modeling of the phosphotyrosine (pTyr)-SH2 domain interaction in the Stat3:Stat3 dimerization, combined with in silico structural analysis of the Stat3 dimerization disruptor, S3I-201, has furnished a diverse set of analogs. We present evidence from in vitro biochemical and biophysical studies that the structural analog, S3I-201.1066 directly interacts with Stat3 or the SH2 domain, with an affinity (K(D)) of 2.74microM, and disrupts the binding of Stat3 to the cognate pTyr-peptide, GpYLPQTV-NH(2), with an IC(50) of 23microM. Moreover, S3I-201.1066 selectively blocks the association of Stat3 with the epidermal growth factor receptor (EGFR), and inhibits Stat3 tyrosine phosphorylation and nuclear translocation in EGF-stimulated mouse fibroblasts. In cancer cells that harbor aberrant Stat3 activity, S3I-201.1066 inhibits constitutive Stat3 DNA-binding and transcriptional activities. By contrast, S3I-201.1066 has no effect on Src activation or the EGFR-mediated activation of the Erk1/2(MAPK) pathway. S3I-201.1066 selectively suppresses the viability, survival, and malignant transformation of the human breast and pancreatic cancer lines and the v-Src-transformed mouse fibroblasts harboring persistently active Stat3. Treatment with S3I-201.1066 of malignant cells harboring aberrantly active Stat3 down-regulated the expression of c-Myc, Bcl-xL, Survivin, the matrix metalloproteinase 9, and VEGF. The in vivo administration of S3I-201.1066-induced significant antitumor response in mouse models of human breast cancer, which correlates with the inhibition of constitutively active Stat3 and the suppression of known Stat3-regulated genes. Our studies identify a novel small-molecule that binds with a high affinity to Stat3, blocks Stat3 activation and function, and thereby induces antitumor response in human breast tumor xenografts harboring persistently active Stat3.

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Crossref · 10.1016/j.bcp.2010.01.001

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  • Small molecules, peptides, or peptidomimetic compounds targeting the STAT3 SH2 domain are designed to disrupt STAT3 dimerization, preventing its translocation to the nucleus and transcription.

    “Such molecules are designed to disrupt STAT3 dimerization, thus preventing its translocation to the nucleus and transcription.”
  • STAT3 may be targeted via its SH2 domain by small molecules, peptides, or peptidomimetic compounds.

    “STAT3 may be targeted via its SH2 domain by small molecules, peptides, or peptidomimetic compounds.101–104”

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  1. [40]Jones G Willett P Glen RC Leach AR Taylor R Development and validation of a genetic algorithm for flexible docking J Mol Biol 1997 267 727 48 9126849

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Authors
Zhang, X., Yue, P., Fletcher, S., Zhao, W., Gunning, P. T., & Turkson, J.
Affiliations
  • University of Central Florida (US)
  • University of Toronto (CA)
Corresponding author
Turkson, James
Venue
Biochemical Pharmacology
Publisher
Elsevier BV
Published
2010-05
Volume
79
Issue
10
Pages
1398-1409
ISSN
0006-2952 (ISSN-L)
OpenAlex
W2029638319
Cited by
179
References
57
Citations by year
2026: 5 · 2025: 3 · 2024: 8 · 2023: 5 · 2022: 7 · 2021: 15 · 2020: 15 · 2019: 10 · 2018: 10 · 2017: 6 · 2016: 9 · 2015: 16 · 2014: 19 · 2013: 17 · 2012: 13
FWCI
9.00
Type
journal article
Language
en
Open access
Locations
  • Biochemical Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Journal of International Crisis and Risk Communication Research (submittedVersion)
Funders
  • National Cancer Institute (106439, 128865)
  • Leukemia and Lymphoma Society of Canada
  • University of Toronto
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
STAT3, SH2 domain, phosphotyrosine binding, small molecule inhibitors, STAT3 dimerization, EGFR, STAT3 tyrosine phosphorylation, nuclear translocation, breast cancer, pancreatic cancer, c-Myc, Bcl-xL, survivin, MMP-9, vascular endothelial growth factor, anticancer activity
MeSH terms
Aminosalicylic Acids, Animals, Benzenesulfonates, Breast Neoplasms, Cell Line, Cell Transformation, Neoplastic, DNA, Neoplasm, Female, Humans, Mice, Nude, Pancreatic Neoplasms, Transcriptional Activation, Gene Expression Regulation, Neoplastic, Fluorescence Polarization Immunoassay, src Homology Domains, Surface Plasmon Resonance, Cell Line, Tumor, STAT3 Transcription Factor, Mice, ErbB Receptors

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