Abstract
The mechanistic target of rapamycin (mTOR) is a serine/threonine kinase whose activity contributes to leukemia proliferation and survival. Compounds targeting the mTOR active site inhibit rapamycin-resistant functions and have enhanced anticancer activity in mouse models. MLN0128 (formerly known as INK128) is a novel, orally active mTOR kinase inhibitor currently in clinical development. Here, we evaluated MLN0128 in preclinical models of B-cell acute lymphoblastic leukemia (B-ALL). MLN0128 suppressed proliferation of B-ALL cell lines in vitro and reduced colony formation by primary human leukemia cells from adult and pediatric B-ALL patients. MLN0128 also boosted the efficacy of dasatinib (DA) in Philadelphia Chromosome-positive (Ph+) specimens. In a syngeneic mouse model of lymphoid BCR-ABL+ disease, daily oral dosing of MLN0128 rapidly cleared leukemic outgrowth. In primary xenografts of Ph+ B-ALL specimens, MLN0128 significantly enhanced the efficacy of DA. In non-Ph B-ALL xenografts, single agent MLN0128 had a cytostatic effect that was most pronounced in mice with low disease burden. In all in vivo models, MLN0128 was well tolerated and did not suppress endogenous bone marrow proliferation. These findings support the rationale for clinical testing of MLN0128 in both adult and pediatric B-ALL and provide insight towards optimizing therapeutic efficacy of mTOR kinase inhibitors.
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Acknowledgements
This study was supported by National Institutes of Health grant CA158383 (to DAF), National Institutes of Health training grant T32-CA009054 (to MRJ), a Discovery Grant from the University of California Industry–University Cooperative Research Program (to DAF), a Hope Grant from the Hyundai Hope on Wheels Foundation (to DAF) and a sponsored research agreement from Intellikine (to DAF). We thank Hang Pham, Briana Fitch and Mengrou Lu for help with animal studies, Marina Konopleva for access to clinical leukemia samples at MD Anderson Cancer Center, Jean-Pierre Bourquin for advice on stromal cell support cultures, Dario Campana for hTERT-immortalized BM stromal cells and David Rawlings for non-Ph B-ALL cell lines.
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MRJ, LL, KAJ and MBM are employees of Takeda California, a pharmaceutical company involved with the investigation of MLN0128. MRJ, LL, KAJ, MBM, PR, YL and CR were all previous employees of Intellikine, a pharmaceutical company that designed and developed MLN0128 (previously designated INK128). DAF was a scientific advisor to Intellikine in the development and utilization of MLN0128.
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Janes, M., Vu, C., Mallya, S. et al. Efficacy of the investigational mTOR kinase inhibitor MLN0128/INK128 in models of B-cell acute lymphoblastic leukemia. Leukemia 27, 586–594 (2013). https://doi.org/10.1038/leu.2012.276
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DOI: https://doi.org/10.1038/leu.2012.276
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