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• W2904376071 abstract "TG02 is a novel cyclin-dependent kinase (CDK) inhibitor and thought to act mainly via CDK-9 inhibition-dependent depletion of short-lived oncoproteins such as MCL-1 or c-MYC. We studied the activity of TG02 in 9 human long-term glioma cell lines (LTC) and 5 glioma-initiating cell lines (GIC) using various cell death assays in vitro and in the LN-229 LTC and ZH-161 GIC models in vivo. TG02 exhibits strong anti-tumor cell activity with EC50 concentrations in the nanomolar range. Median survival in the LN-229 and ZH-161 models was moderately prolonged by TG02. Neither constitutive CDK levels nor those of MCL-1 or c-MYC correlated with sensitivity to TG02. Cdk-9 or cdk-5 gene silencing alone did not fully reproduce the effects of TG02. C-myc gene silencing inhibited cell growth, but did not modulate TG02 activity. Electron microscopy revealed cell death to be essentially apoptotic. High concentrations of TG02 induced annexin V binding and minor caspase 3 cleavage, but the pan-caspase inhibitor, zVAD-fmk, or BCL-2 or MCL-1 gene transfer only moderately attenuated TG02-induced cell death, and caspase inhibition did not prevent loss of MCL-1 or c-MYC. TG02 activity was independent of O6 -methylguanine DNA methyltransferase expression. Repetitive exposure to TG02 did not generate an acquired TG02 resistance phenotype, but accumulation of MCL-1, loss of c-MYC, or senescence. TG02 is a highly potent apoptosis-inducing agent in glioma cells in vitro. Caspase inhibition does not rescue TG02-treated cells and repetitive exposure fails to confer acquired resistance, supporting the clinical evaluation of TG02 in glioblastoma." @default.
• W2904376071 created "2018-12-22" @default.
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• W2904376071 date "2019-01-12" @default.
• W2904376071 modified "2023-10-14" @default.
• W2904376071 title "Profound, durable and MGMT‐independent sensitivity of glioblastoma cells to cyclin‐dependent kinase inhibition" @default.
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• W2904376071 doi "https://doi.org/10.1002/ijc.32069" @default.
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