[HTML][HTML] A High-Throughput In Vitro Drug Screen in a Genetically Engineered Mouse Model of Diffuse Intrinsic Pontine Glioma Identifies BMS-754807 as a Promising …

KG Halvorson, KL Barton, K Schroeder, KL Misuraca… - PloS one, 2015 - journals.plos.org
KG Halvorson, KL Barton, K Schroeder, KL Misuraca, C Hoeman, A Chung, DM Crabtree…
PloS one, 2015journals.plos.org
Diffuse intrinsic pontine gliomas (DIPGs) represent a particularly lethal type of pediatric brain
cancer with no effective therapeutic options. Our laboratory has previously reported the
development of genetically engineered DIPG mouse models using the RCAS/tv-a system,
including a model driven by PDGF-B, H3. 3K27M, and p53 loss. These models can serve as
a platform in which to test novel therapeutics prior to the initiation of human clinical trials. In
this study, an in vitro high-throughput drug screen as part of the DIPG preclinical consortium …
Diffuse intrinsic pontine gliomas (DIPGs) represent a particularly lethal type of pediatric brain cancer with no effective therapeutic options. Our laboratory has previously reported the development of genetically engineered DIPG mouse models using the RCAS/tv-a system, including a model driven by PDGF-B, H3.3K27M, and p53 loss. These models can serve as a platform in which to test novel therapeutics prior to the initiation of human clinical trials. In this study, an in vitro high-throughput drug screen as part of the DIPG preclinical consortium using cell-lines derived from our DIPG models identified BMS-754807 as a drug of interest in DIPG. BMS-754807 is a potent and reversible small molecule multi-kinase inhibitor with many targets including IGF-1R, IR, MET, TRKA, TRKB, AURKA, AURKB. In vitro evaluation showed significant cytotoxic effects with an IC50 of 0.13 μM, significant inhibition of proliferation at a concentration of 1.5 μM, as well as inhibition of AKT activation. Interestingly, IGF-1R signaling was absent in serum-free cultures from the PDGF-B; H3.3K27M; p53 deficient model suggesting that the antitumor activity of BMS-754807 in this model is independent of IGF-1R. In vivo, systemic administration of BMS-754807 to DIPG-bearing mice did not prolong survival. Pharmacokinetic analysis demonstrated that tumor tissue drug concentrations of BMS-754807 were well below the identified IC50, suggesting that inadequate drug delivery may limit in vivo efficacy. In summary, an unbiased in vitro drug screen identified BMS-754807 as a potential therapeutic agent in DIPG, but BMS-754807 treatment in vivo by systemic delivery did not significantly prolong survival of DIPG-bearing mice.
PLOS