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• W2092226912 abstract "Resistance to apoptosis is one reason for the poor response of malignant brain tumors to therapy. The PPARγ-modulating drug Troglitazone down-regulates the anti-apoptotic FLIP protein and sensitizes glioblastoma cells to apoptosis induced by the death ligand TRAIL. To investigate the molecular basis of an experimental combination therapy for malignant gliomas with TRAIL and Troglitazone, we investigated the Troglitazone-induced signaling cascades and the expression of TRAIL receptors and FLIP in malignant gliomas. Troglitazone down-regulated the FLIP protein through accelerated ubiquitin/proteasome-dependent degradation, which might be mediated by a Troglitazone-induced increase in reactive oxygen species. Moreover, Troglitazone induced the phosphorylation of the MAP kinase ERK1/2 as well as of the BAD protein. Inhibition of either PPARγ or MEK1/2 blocked the Troglitazone-mediated phosphorylation of BAD and further increased the synergistic induction of glioma cell death by TRAIL and Troglitazone. Immunohistochemical analysis demonstrated that FLIP and TRAIL-R2 were significantly higher expressed in anaplastic (WHO grade III) than in diffuse (WHO grade II) gliomas. High FLIP and low TRAIL-R2 expression levels were associated with a poor prognosis of patients. Our findings warrant a further pre-clinical evaluation of an experimental anti-glioma therapy with TRAIL and Troglitazone, potentially in conjunction with a MAP kinase inhibitor." @default.
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• W2092226912 date "2008-12-01" @default.
• W2092226912 modified "2023-09-25" @default.
• W2092226912 title "Troglitazone-mediated sensitization to TRAIL-induced apoptosis is regulated by proteasome-dependent degradation of FLIP and ERK1/2-dependent phosphorylation of BAD" @default.
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• W2092226912 doi "https://doi.org/10.4161/cbt.7.12.6966" @default.
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