Fig. 1. Effect of HSP90 inhibition on mutant KIT signalling.
a KIT gene mutation and effects of IM, TAS-116 and 17-AAG in IM-naïve and IM-resistant GIST cell lines. b Cell proliferation was determined by WST-8 assays at 72 h after incubation with TAS-116. Each value is represented as the mean ± SD. c Western blot analysis of HSP90, HSP70, pKIT/KIT, pAKT/AKT and pERK/ERK in GIST cell lysates at 12 h after IM, TAS-116 and 17-AAG treatments was performed. d Caspase-3/7 activity was determined using luminescence assays 24 h after incubation with 0.1 μM IM and 0.25–1.0 μM TAS-116.