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• W2741569242 abstract "BACKGROUND: Screening a focused library of indene derivatives for PDE10 inhibitory activity identified novel leads with potent and selective tumor cell growth inhibitory activity. ADT-030 emerged from lead optimization chemistry with excellent drug-like properties and oral bioavailability. Here we characterize the anti-tumor activity of ADT-030 in human lung tumor cells and an orthotopic mouse model of lung cancer. METHODS: Growth inhibitory activity of ADT-030 was measured in a panel of human lung tumor cell lines by ATP quantification following 72 h of treatment. The effect of ADT-030 on intracellular cGMP/cAMP was measured in whole cell lysates using a competitive ELISA assay. PDE inhibitory activity of ADT-030 was evaluated in lysates of human lung tumor cells and by recombinant PDE isozymes using the IMAP fluorescence polarization PDE assay. Activation of PKG signaling and suppression of β-catenin levels in response to ADT-030 treatment was evaluated by Western blot using whole cell lysates of human lung tumor cells. ADT-030 was orally administrated to C57BL/6 mice and free levels quantified in plasma and tissues by LC-MS. Anti-tumor activity of ADT-030 was evaluated in athymic nude-Foxn1nu mice after inoculating the left lung with 1x106 A549 lung tumor cells and treating once daily by oral administration at dosages ranging from 25 - 125 mg/kg. Tumor growth was monitored by in situ bioluminescence using IVIS as well as necropsy and pathological grading after 4 weeks of treatment. RESULTS: ADT-030 inhibited the growth of human lung tumor cell lines with IC50 values in the low micromolar range by inducing apoptosis, while appreciably higher concentrations were required to affect the growth of normal human airway epithelial cells. ADT-030 treatment of human lung tumor cells increased both intracellular cGMP and cAMP levels, activated PKG and suppressed β-catenin within the same concentration range as required for tumor cell growth inhibition. Pharmacokinetic studies in mice demonstrated a half-life suitable for once a day dosing. Tissue distribution studies revealed appreciably higher concentrations of ADT-030 in lungs relative to plasma and other tissues, with the highest accumulation measured in the parenchyma. ADT-030 was well tolerated in mice implanted with A549 tumor cells and displayed strong anti-tumor activity as evident by reduced luminescence, tumor grading, and double-blinded pathological evaluation. CONCLUSIONS: ADT-030 represents a prospective drug development candidate with favorable drug-like properties that concentrates in lung after oral administration exhibiting a strong anti-tumor activity in a pre-clinical mouse model. The mechanism of lung tumor cell growth inhibition involves PDE10 inhibition, elevation of cGMP, activation of PKG, and attenuation of β-catenin. Citation Format: Veronica Ramirez-Alcantara, Bing Zhu, Xi Chen, Rajkumar Savai, Prema Subbarayal, Michele A. Schuler, Kevin J. Lee, Ashley S. Lindsey, Kristy L. Berry, Dennis Otali, Joshua Canzoneri, Jacob Valiyaveettil, Adam Keeton, Lori Coward, Gregory Gorman, William Grizzle, Michael Boyd, Gary A. Piazza. Characterization of a novel PDE10 inhibitor in lung tumor cells and an orthotopic mouse model of lung cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 1140. doi:10.1158/1538-7445.AM2017-1140" @default.
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• W2741569242 date "2017-07-01" @default.
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• W2741569242 title "Abstract 1140: Characterization of a novel PDE10 inhibitor in lung tumor cells and an orthotopic mouse model of lung cancer" @default.
• W2741569242 doi "https://doi.org/10.1158/1538-7445.am2017-1140" @default.
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