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Ref Type Journal Article
PMID (32439931)
Authors Kostaras E, Kaserer T, Lazaro G, Heuss SF, Hussain A, Casado P, Hayes A, Yandim C, Palaskas N, Yu Y, Schwartz B, Raynaud F, Chung YL, Cutillas PR, Vivanco I
Title A systematic molecular and pharmacologic evaluation of AKT inhibitors reveals new insight into their biological activity.
Journal Vol Issue Date Pages Journal Short Title
British journal of cancer 123 4 2020 08 542-555 Br J Cancer
URL
Abstract Text AKT, a critical effector of the phosphoinositide 3-kinase (PI3K) signalling cascade, is an intensely pursued therapeutic target in oncology. Two distinct classes of AKT inhibitors have been in clinical development, ATP-competitive and allosteric. Class-specific differences in drug activity are likely the result of differential structural and conformational requirements governing efficient target binding, which ultimately determine isoform-specific potency, selectivity profiles and activity against clinically relevant AKT mutant variants.We have carried out a systematic evaluation of clinical AKT inhibitors using in vitro pharmacology, molecular profiling and biochemical assays together with structural modelling to better understand the context of drug-specific and drug-class-specific cell-killing activity.Our data demonstrate clear differences between ATP-competitive and allosteric AKT inhibitors, including differential effects on non-catalytic activity as measured by a novel functional readout. Surprisingly, we found that some mutations can cause drug resistance in an isoform-selective manner despite high structural conservation across AKT isoforms. Finally, we have derived drug-class-specific phosphoproteomic signatures and used them to identify effective drug combinations.These findings illustrate the utility of individual AKT inhibitors, both as drugs and as chemical probes, and the benefit of AKT inhibitor pharmacological diversity in providing a repertoire of context-specific therapeutic options.

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