Knockdown of Cytoglobin Expression Sensitizes Human Glioma Cells to Radiation and Oxidative Stress
| Autor: | Joan Allalunis-Turner, Ivy Ma, Jingye Fang |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Tumor suppressor gene
Cell Survival Biophysics Antimycin A Biology medicine.disease_cause Radiation Tolerance law.invention chemistry.chemical_compound law Cell Line Tumor medicine Humans Doubling time Radiology Nuclear Medicine and imaging Globin Cell Proliferation Gene knockdown Radiation Cell Cycle Cytoglobin Glioma Molecular biology Cell Hypoxia Globins Oxidative Stress chemistry Gene Knockdown Techniques Cancer research Suppressor Reactive Oxygen Species Oxidative stress |
| Zdroj: | Radiation Research. 176:198-207 |
| ISSN: | 1938-5404 0033-7587 |
| Popis: | Cytoglobin is a recently identified vertebrate globin whose functions include scavenging reactive oxygen and nitrosative species. In tumor cells, CYGB may function as a tumor suppressor gene. Here we show that knockdown of cytoglobin expression can sensitize human glioma cells to oxidative stress induced by chemical inhibitors of the electron transport chain and as well can increase cellular radiosensitivity. When treated with antimycin A, an inhibitor of the mitochondrial electron transport chain, cytoglobin-deficient cells showed significantly higher H₂O₂ levels, whereas H₂O₂ levels were significantly reduced in cytoglobin-overexpressing cells. In addition, cytoglobin knockdown significantly decreased the doubling time of glioma cell lines, consistent with a putative tumor suppressor function. These finding suggest that modulating cytoglobin levels may be a promising treatment strategy for sensitizing human glioma cells to oxidative stress that is induced by ionizing radiation, certain chemotherapies and ischemia-reperfusion. |
| Databáze: | OpenAIRE |
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