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    PARP1 PARylates and stabilizes STAT5 in FLT3-ITD acute myeloid leukemia and other STAT5-activated cancers

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    Author
    Dellomo, Anna J
    Abbotts, Rachel
    Eberly, Christian L
    Karbowski, Mariusz
    Baer, Maria R
    Kingsbury, Tami J
    Rassool, Feyruz V
    Date
    2021-11-19
    Journal
    Translational Oncology
    Publisher
    Elsevier Inc.
    Type
    Article
    
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    See at
    https://doi.org/10.1016/j.tranon.2021.101283
    Abstract
    Signal transducer and activator of transcription 5 (STAT5) signaling plays a pathogenic role in both hematologic malignancies and solid tumors. In acute myeloid leukemia (AML), internal tandem duplications of fms-like tyrosine kinase 3 (FLT3-ITD) constitutively activate the FLT3 receptor, producing aberrant STAT5 signaling, driving cell survival and proliferation. Understanding STAT5 regulation may aid development of new treatment strategies in STAT5-activated cancers including FLT3-ITD AML. Poly ADP-ribose polymerase (PARP1), upregulated in FLT3-ITD AML, is primarily known as a DNA repair factor, but also regulates a diverse range of proteins through PARylation. Analysis of STAT5 protein sequence revealed putative PARylation sites and we demonstrate a novel PARP1 interaction and direct PARylation of STAT5 in FLT3-ITD AML. Moreover, PARP1 depletion and PARylation inhibition decreased STAT5 protein expression and activity via increased degradation, suggesting that PARP1 PARylation of STAT5 at least in part potentiates aberrant signaling by stabilizing STAT5 protein in FLT3-ITD AML. Importantly for translational significance, PARPis are cytotoxic in numerous STAT5-activated cancer cells and are synergistic with tyrosine kinase inhibitors (TKI) in both TKI-sensitive and TKI-resistant FLT3-ITD AML. Therefore, PARPi may have therapeutic benefit in STAT5-activated and therapy-resistant leukemias and solid tumors.
    Rights/Terms
    Copyright © 2021. Published by Elsevier Inc.
    Keyword
    PARP inhibition
    PARYlation
    Post-translational modifications
    STAT5 protein stability
    TKI-resistant FLT3-ITD AML
    Identifier to cite or link to this item
    http://hdl.handle.net/10713/17195
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.tranon.2021.101283
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