Abstract
Cell-based screening can facilitate the rapid identification of compounds inducing complex cellular phenotypes. Advancing a compound toward the clinic, however, generally requires the identification of precise mechanisms of action. We previously found that epidermal growth factor receptor (EGFR) inhibitors induce acute myeloid leukemia (AML) differentiation via a non-EGFR mechanism. In this report, we integrated proteomic and RNAi-based strategies to identify their off-target, anti-AML mechanism. These orthogonal approaches identified Syk as a target in AML. Genetic and pharmacological inactivation of Syk with a drug in clinical trial for other indications promoted differentiation of AML cells and attenuated leukemia growth in vivo. These results demonstrate the power of integrating diverse chemical, proteomic, and genomic screening approaches to identify therapeutic strategies for cancer.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Aminopyridines
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Animals
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Antineoplastic Agents / pharmacology*
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Cell Differentiation / drug effects*
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Cell Proliferation / drug effects*
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Cell Survival / drug effects
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Dose-Response Relationship, Drug
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Gefitinib
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Gene Expression Profiling
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Gene Expression Regulation, Leukemic
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Genomics* / methods
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HL-60 Cells
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Humans
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Inhibitory Concentration 50
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Intracellular Signaling Peptides and Proteins / antagonists & inhibitors*
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Intracellular Signaling Peptides and Proteins / genetics
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Intracellular Signaling Peptides and Proteins / metabolism
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Leukemia, Myeloid, Acute / drug therapy*
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Leukemia, Myeloid, Acute / genetics
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Leukemia, Myeloid, Acute / metabolism
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Leukemia, Myeloid, Acute / pathology
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Male
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Mice
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Mice, Inbred C57BL
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Mice, Inbred NOD
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Mice, SCID
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Morpholines
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Oxazines / pharmacology
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Phosphorylation
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Protein Kinase Inhibitors / pharmacology*
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Protein-Tyrosine Kinases / antagonists & inhibitors*
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Protein-Tyrosine Kinases / genetics
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Protein-Tyrosine Kinases / metabolism
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Proteomics* / methods
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Pyridines / pharmacology
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Pyrimidines
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Quinazolines / pharmacology
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RNA Interference
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Syk Kinase
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Tandem Mass Spectrometry
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Time Factors
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Tumor Cells, Cultured
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Tyrosine
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U937 Cells
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Xenograft Model Antitumor Assays
Substances
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Aminopyridines
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Antineoplastic Agents
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Intracellular Signaling Peptides and Proteins
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Morpholines
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Oxazines
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Protein Kinase Inhibitors
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Pyridines
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Pyrimidines
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Quinazolines
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Tyrosine
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Protein-Tyrosine Kinases
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SYK protein, human
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Syk Kinase
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Syk protein, mouse
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Gefitinib
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fostamatinib