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Tumor metabolism has been deeply investigated for cancer therapeutics. Here, we demonstrate that glutamine deficiency alone could not completely inhibit cancer cell growth and that many potent kidney-type glutaminase (KGA) inhibitors did not show satisfying in vivo efficacy. The potent KGA allosteric inhibitor, CB-839, resulted in up to 80% growth inhibition of all tested cell lines, whereas Hexylselen (CPD-3B), a KGA/glutamate dehydrogenase (GDH) inhibitor, showed essentially no toxicity to normal cells up to a 10 μM concentration and could completely inhibit the growth of many aggressive cell lines. Further analyses showed that CPD-3B targets not only KGA and GDH but also thioredoxin reductase (TrxR) and amidotransferase (GatCAB), which results in corresponding regulation of Akt/Erk/caspase-9 signaling pathways. In an aggressive liver cancer xenograft model, CPD-3B significantly reduced tumor size, caused massive tumor tissue damage, and prolonged survival rate. These provide important information for furthering the drug design of an effective anticancer KGA allosteric inhibitor.

Kidney-Type Glutaminase Inhibitor Hexylselen Selectively Kills Cancer Cells via a Three-Pronged Mechanism