Discovery of a small-molecule inhibitor of STAT3 by ligand-based pharmacophore screening

Ka-Ho Leung, Li-Juan Liu, Sheng Lin, Lihua Lu, Hai-Jing Zhong, Dewi Susanti, Weidong Rao, Modi Wang, Weng Ian Che, Daniel Shiu-Hin Chan, Chung-Hang Duncan Leung, Philip Wai Hong Chan, Dik-Lung Edmond Ma

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16 Citations (Scopus)

Abstract

STAT3 modulates the transcription of a wide variety of regulatory genes involved in cell proliferation, differentiation, migration, apoptosis, and other critical cellular functions. Constitutive activation of STAT3 has been detected in a wide spectrum of human malignancies. A pharmacophore model constructed from a training set of STAT3 inhibitors binding to the SH2 domain was used to screen an in-house database of compounds, from which azepine 1 emerged as a top candidate. Compound 1 inhibited STAT3 DNA-binding activity in vitro and attenuated STAT3-directed transcription in cellulo with comparable potency to the well-known STAT3 inhibitor S3I-201. A fluorescence polarization assay revealed that compound 1 targeted the SH2 domain of STAT3. Furthermore, compound 1 inhibited STAT3 phosphorylation in cells without affecting the total expression of STAT3. This study also validates the use of pharmacophore modeling to identify inhibitors of protein-protein interactions.
Original languageEnglish
Pages (from-to)38-43
Number of pages6
JournalMethods
Volume71
Issue numberC
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Pharmacophore
  • Protein-protein interaction
  • STAT3
  • Virtual screening

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