Targeting nuclear β-catenin as therapy for post-myeloproliferative neoplasm secondary AML

Dyana T. Saenz, Warren Fiskus, Taghi Manshouri, Christopher P. Mill, Yimin Qian, Kanak Raina, Kimal Rajapakshe, Cristian Coarfa, Raffaella Soldi, Prithviraj Bose, Gautam Borthakur, Tapan M. Kadia, Joseph D. Khoury, Lucia Masarova, Agnieszka J. Nowak, Baohua Sun, David N. Saenz, Steven M. Kornblau, Steve Horrigan, Sunil SharmaPeng Qiu, Craig M. Crews, Srdan Verstovsek, Kapil N. Bhalla

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Transformation of post-myeloproliferative neoplasms into secondary (s) AML exhibit poor clinical outcome. In addition to increased JAK-STAT and PI3K-AKT signaling, post-MPN sAML blast progenitor cells (BPCs) demonstrate increased nuclear β-catenin levels and TCF7L2 (TCF4) transcriptional activity. Knockdown of β-catenin or treatment with BC2059 that disrupts binding of β-catenin to TBL1X (TBL1) depleted nuclear β-catenin levels. This induced apoptosis of not only JAKi-sensitive but also JAKi-persister/resistant post-MPN sAML BPCs, associated with attenuation of TCF4 transcriptional targets MYC, BCL-2, and Survivin. Co-targeting of β-catenin and JAK1/2 inhibitor ruxolitinib (rux) synergistically induced lethality in post-MPN sAML BPCs and improved survival of mice engrafted with human sAML BPCs. Notably, co-treatment with BET protein degrader ARV-771 and BC2059 also synergistically induced apoptosis and improved survival of mice engrafted with JAKi-sensitive or JAKi-persister/resistant post-MPN sAML cells. These preclinical findings highlight potentially promising anti-post-MPN sAML activity of the combination of β-catenin and BETP antagonists against post-MPN sAML BPCs.

Original languageEnglish
Pages (from-to)1373-1386
Number of pages14
JournalLeukemia
Volume33
Issue number6
DOIs
StatePublished - 1 Jun 2019
Externally publishedYes

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