Small Molecule STAT5-SH2 Domain Inhibitors Exhibit Potent Antileukemia Activity

    Authors

    B. D. G. Page; H. Khoury; R. C. Laister; S. Fletcher; M. Vellozo; A. Manzoli; P. B. Yue; J. Turkson; M. D. Minden;P. T. Gunning

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    Abbreviated Journal Title

    J. Med. Chem.

    Keywords

    SIGNAL TRANSDUCER; FLUORESCENCE POLARIZATION; TRANSCRIPTION FACTORS; LEUKEMIA-CELLS; STAT PROTEINS; ACTIVATOR; ASSAY; CONTRIBUTES; DISRUPTION; LINES; Chemistry, Medicinal

    Abstract

    A growing body of evidence shows that Signal Transducer and Activator of Transcription 5 (STAT5) protein, a key member of the STAT family of signaling proteins, plays a pivotal role in the progression of many human cancers, including acute myeloid leukemia and prostate cancer. Unlike STAT3, where significant medicinal effort has been expended to identify potent direct inhibitors, Stat5 has been poorly investigated as a molecular therapeutic target. Thus, in an effort to identify direct inhibitors of STAT5 protein, we conducted an in vitro screen of a focused library of SH2 domain binding salicylic acid-containing inhibitors (similar to 150) against STAT5, as well as against STAT3 and STAT1 proteins for SH2 domain selectivity. We herein report the identification of several potent (K-i < 5 mu M) and STAT5 selective ( > 3-fold specificity for STAT5 cf. STAT1 and STAT3) inhibitors, BP-1-107, BP-1-108, SF-1-087, and SF-1-088. Lead agents, evaluated in 1(562 and MV-4-11 human leukemia cells, showed potent induction of apoptosis (IC50's similar to 20 mu M) which correlated with potent and selective suppression of STAT5 phosphorylation, as well as inhibition of STAT5 target genes cyclin D1, cyclin D2, C-MYC, and MCL-1. Moreover, lead agent BP-1-108 showed negligible cytotoxic effects in normal bone marrow cells not expressing activated STAT5 protein. Inhibitors identified in this study represent some of the most potent direct small molecule, nonphosphorylated inhibitors of STAT5 to date.

    Journal Title

    Journal of Medicinal Chemistry

    Volume

    55

    Issue/Number

    3

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    1047

    Last Page

    1055

    WOS Identifier

    WOS:000299984900005

    ISSN

    0022-2623

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