Down-regulation of the inhibitor of growth 1 (ING1) tumor suppressor sensitizes p53-deficient glioblastoma cells to cisplatin-induced cell death |
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Authors: | Ute Gesche Tallen Matthias Truss Frank Kunitz Sven Wellmann Brad Unryn Brigitte Sinn Ulrike Lass Sonja Krabbe Nikola Holtkamp Christian Hagemeier Reinhard Wurm Guenter Henze Karl T. Riabowol Andreas von Deimling |
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Affiliation: | 1. Department of Pediatric Oncology and Hematology, Children’s Hospital, Charité, Universit?tsmedizin-Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353, Berlin, Germany 2. Department of Paediatrics, Laboratory for Molecular Biology, Charité, Universit?tsmedizin-Berlin, Berlin, Germany 3. Department of Neuropathology, Charité, Universit?tsmedizin-Berlin, Berlin, Germany 4. University Children’s Hospital (UKBB), P. O. Box 4005, Basel, Switzerland 5. Department of Biochemistry and Molecular Biology, Faculty of Medicine, The University of Calgary, Calgary, AB, Canada 6. Department of Oncology, Faculty of Medicine, The University of Calgary, Calgary, AB, Canada 7. Department of Radiotherapy, Charité, Universit?tsmedizin-Berlin, Berlin, Germany 8. Department of Neuropathology, University of Heidelberg, Heidelberg, Germany
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Abstract: | Impaired tumor suppressor functions, such as deficient p53, are characteristic for glioblastoma multiforme (GBM) and can cause resistance to DNA-damaging agents like cisplatin. We have recently shown that the INhibitor of Growth 1 (ING1) tumor suppressor is down-regulated in malignant gliomas and that the decrease of ING1 expression correlates with histological grade of malignancy, suggesting a role for ING1 in the pathogenesis and progression of malignant gliomas. Based on this background, the purpose of our current study was to examine the potential impact of ING1 protein levels on DNA-damage response in GBM. Using LN229 GBM cells, which express ING1 proteins and harbor mutant TP53, we are the first to show that DNA damage by cisplatin or ionizing radiation differentially induced the two major ING1 splicing isoforms. The p47 ING1a isoform, that promotes deacetylation of histones, thus formation of heterochromatic regions of DNA, which are less susceptible to DNA damage, was preferentially induced by >50-fold. This might represent a response to protect DNA from damage. Also, ING1 knockdown by siRNA accelerated transit of cells through G1 phase, consistent with ING1 serving a tumor suppressor function, and caused cells to enter apoptosis more rapidly in response to cisplatin. Our results indicate that malignant gliomas may down-regulate ING1 to allow more efficient tumor growth and progression. Also, ING1 down-regulation may sensitize GBM cells with deficient p53 to treatment with cisplatin. U. G. Tallen and M. Truss contributed equally to this work. |
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Keywords: | Cisplatin DNA-damage Glioblastoma multiforme ING1 isoforms |
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