title: Antagonism of the Stat3-Stat3 protein dimer with salicylic acid based small molecules.
abstract: More than 50 new inhibitors of the oncogenic Stat3 protein were identified through a structure-activity relationship (SAR) study based on the previously identified inhibitor S3I-201 (IC₅₀ =86 μM, K(i) >300 μM). A key structural feature of these inhibitors is a salicylic acid moiety, which, by acting as a phosphotyrosine mimetic, is believed to facilitate binding to the Stat3 SH2 domain. Several of the analogues exhibit higher potency than the lead compound in inhibiting Stat3 DNA binding activity, with an in vitro IC₅₀ range of 18.7-51.9 μM, and disruption of Stat3-pTyr peptide interactions with K(i) values in the 15.5-41 μM range. One agent in particular exhibited potent inhibition of Stat3 phosphorylation in both breast and multiple myeloma tumor cells, suppressed the expression of Stat3 target genes, and induced antitumor effects in tumor cells harboring activated Stat3 protein.
authors: Department of Chemistry, University of Toronto Mississauga, Mississauga, ON L5L1C6, Canada.
authors: Steven
authors: S
authors: Fletcher
authors: Brent D G
authors: BD
authors: Page
authors: Xialoei
authors: X
authors: Zhang
authors: Peibin
authors: P
authors: Yue
authors: Zhi Hua
authors: ZH
authors: Li
authors: Sumaiya
authors: S
authors: Sharmeen
authors: Jagdeep
authors: J
authors: Singh
authors: Wei
authors: W
authors: Zhao
authors: Aaron D
authors: AD
authors: Schimmer
authors: Suzanne
authors: S
authors: Trudel
authors: James
authors: J
authors: Turkson
authors: Patrick T
authors: PT
authors: Gunning
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