Down-regulation of the inhibitor of growth 1 (ING1) tumor suppressor sensitizes p53-deficient glioblastoma cells to cisplatin-induced cell death
| Autor: | Christian Hagemeier, Sonja Krabbe, Brigitte Sinn, Ulrike Lass, Frank Kunitz, Matthias Truss, Ute Gesche Tallen, Sven Wellmann, Nikola Holtkamp, Guenter Henze, Brad M. Unryn, Reinhard Wurm, Andreas von Deimling, Karl Riabowol |
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| Rok vydání: | 2007 |
| Předmět: |
Cancer Research
Programmed cell death Time Factors DNA damage Down-Regulation Antineoplastic Agents Transfection Cell Line Tumor medicine Humans RNA Small Interfering Cisplatin Gene knockdown Radiation biology Tumor Suppressor Proteins Cell Cycle Intracellular Signaling Peptides and Proteins Nuclear Proteins Histone Bromodeoxyuridine Neurology Oncology Cell culture Apoptosis Immunology biology.protein Cancer research Neurology (clinical) Tumor Suppressor Protein p53 Glioblastoma Inhibitor of Growth Protein 1 DNA Damage medicine.drug |
| Zdroj: | Journal of Neuro-Oncology. 86:23-30 |
| ISSN: | 1573-7373 0167-594X |
| Popis: | 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 p47ING1a 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. |
| Databáze: | OpenAIRE |
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