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TP-0903 is active in models of drug-resistant acute myeloid leukemia
Jae Yoon Jeon, … , Bhavana Bhatnagar, Sharyn D. Baker
Jae Yoon Jeon, … , Bhavana Bhatnagar, Sharyn D. Baker
Published December 3, 2020
Citation Information: JCI Insight. 2020;5(23):e140169. https://doi.org/10.1172/jci.insight.140169.
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Research Article Hematology Oncology

TP-0903 is active in models of drug-resistant acute myeloid leukemia

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Abstract

Effective treatment for AML is challenging due to the presence of clonal heterogeneity and the evolution of polyclonal drug resistance. Here, we report that TP-0903 has potent activity against protein kinases related to STAT, AKT, and ERK signaling, as well as cell cycle regulators in biochemical and cellular assays. In vitro and in vivo, TP-0903 was active in multiple models of drug-resistant FLT3 mutant AML, including those involving the F691L gatekeeper mutation and bone marrow microenvironment–mediated factors. Furthermore, TP-0903 demonstrated preclinical activity in AML models with FLT3-ITD and common co-occurring mutations in IDH2 and NRAS genes. We also showed that TP-0903 had ex vivo activity in primary AML cells with recurrent mutations including MLL-PTD, ASXL1, SRSF2, and WT1, which are associated with poor prognosis or promote clinical resistance to AML-directed therapies. Our preclinical studies demonstrate that TP-0903 is a multikinase inhibitor with potent activity against multiple drug-resistant models of AML that will have an immediate clinical impact in a heterogeneous disease like AML.

Authors

Jae Yoon Jeon, Daelynn R. Buelow, Dominique A. Garrison, Mingshan Niu, Eric D. Eisenmann, Kevin M. Huang, Megan E. Zavorka Thomas, Robert H. Weber, Clifford J. Whatcott, Steve L. Warner, Shelley J. Orwick, Bridget Carmichael, Emily Stahl, Lindsey T. Brinton, Rosa Lapalombella, James S. Blachly, Erin Hertlein, John C. Byrd, Bhavana Bhatnagar, Sharyn D. Baker

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Figure 3

TP-0903 is active against the TKI-resistant FLT3 F691L gatekeeper mutation.

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TP-0903 is active against the TKI-resistant FLT3 F691L gatekeeper mutati...
(A) Inhibition of viability of Ba/F3 cells expressing FLT3 mutants when treated with indicated TKI (MTT assay, 72 hours, n = 18). (B) Signaling inhibition in indicated Ba/F3 cells treated with DMSO or increasing concentrations of TP-0903 for 1 hour. Western blot analysis was performed on whole-cell lysates run on parallel gels with the indicated antibodies and is representative of 2–3 independent experiments. (C) Peripheral blood GFP+ cells following treatment TP-0903 (60 mg/kg) or gilteritinib (30 mg/kg) once daily (starting at day 3) in a Ba/F3-FLT3-ITD/F691L-GFP+ NSG mouse xenograft model (n = 3–6/cohort). GFP+ cells were measured via flow on day 15. P values were determined using 1-way ANOVA (P < 0.0001) with Tukey multiple comparison test, with specific P values indicated within the figure.
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