Title

Orally bioavailable small-molecule inhibitor of transcription factor Stat3 regresses human breast and lung cancer xenografts

Authors

Authors

X. L. Zhang; P. B. Yue; B. D. G. Page; T. S. Li; W. Zhao; A. T. Namanja; D. Paladino; J. H. Zhao; Y. Chen; P. T. Gunning;J. Turkson

Comments

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Abbreviated Journal Title

Proc. Natl. Acad. Sci. U. S. A.

Keywords

INTERCELLULAR-ADHESION MOLECULE-1; INTERLEUKIN-1 RECEPTOR ANTAGONIST; SIGNAL TRANSDUCER; CELL-TRANSFORMATION; GENE-REGULATION; ACTIVATOR; GROWTH; EXPRESSION; DIMERIZATION; TARGETS; Multidisciplinary Sciences

Abstract

Computer-aided lead optimization derives a unique, orally bioavailable inhibitor of the signal transducer and activator of transcription (Stat)3 Src homology 2 domain. BP-1-102 binds Stat3 with an affinity (K-D) of 504 nM, blocks Stat3-phospho-tyrosine (pTyr) peptide interactions and Stat3 activation at 4-6.8 mu M, and selectively inhibits growth, survival, migration, and invasion of Stat3-dependent tumor cells. BP-1-102-mediated inhibition of aberrantly active Stat3 in tumor cells suppresses the expression of c-Myc, Cyclin D1, Bcl- xL, Survivin, VEGF, and Kruppel-like factor 8, which is identified as a Stat3 target gene that promotes Stat3-mediated breast tumor cell migration and invasion. Treatment of breast cancer cells with BP-1-102 further blocks Stat3-NF-kappa B cross-talk, the release of granulocyte colony-stimulating factor, soluble intercellular adhesion molecule 1, macrophage migration-inhibitory factor/glycosylation-inhibiting factor, interleukin 1 receptor antagonist, and serine protease inhibitor protein 1, and the phosphorylation of focal adhesion kinase and paxillin, while enhancing E-cadherin expression. Intravenous or oral gavage delivery of BP-1-102 furnishes micromolar or microgram levels in tumor tissues and inhibits growth of human breast and lung tumor xenografts.

Journal Title

Proceedings of the National Academy of Sciences of the United States of America

Volume

109

Issue/Number

24

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

9623

Last Page

9628

WOS Identifier

WOS:000305511300082

ISSN

0027-8424

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