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Related Experiment Videos

Ionizing radiation stimulates mitochondrial gene expression and activity

B Gong1, Q Chen, A Almasan

  • 1Department of Cancer Biology, Lerner Research Institute, The Cleveland Clinic Foundation, Ohio 44195, USA.

Radiation Research
|November 7, 1998
PubMed
Summary

Ionizing radiation increases mitochondrial gene expression in glioblastoma cells, likely via oxidative stress. This suggests mitochondria are key targets in radiation signaling and cellular response.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Radioresistant human glioblastoma (T98G) cells were studied to understand radiation-induced gene expression.
  • Mitochondria are central to cellular energy production and oxidative stress responses.

Purpose of the Study:

  • To investigate the specific changes in mitochondrial gene expression following ionizing radiation exposure.
  • To elucidate the role of oxidative stress in mediating radiation-induced mitochondrial responses.

Main Methods:

  • RNA fingerprinting by arbitrary primer polymerase chain reaction (PCR) was used to identify differentially expressed genes.
  • Quantitative analysis of mRNA levels, adenosine triphosphate (ATP) production, mitochondrial membrane potential, mass, and DNA content was performed.

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Main Results:

  • Three mitochondrially encoded mRNAs (MTCO1, MTCO2, NADH dehydrogenase subunit 4) were significantly upregulated 1 hour after irradiation, with sustained expression for 24 hours.
  • Oxidants induced MTCO1 expression, which was blocked by an antioxidant, indicating oxidative stress mediation.
  • Irradiation increased ATP levels and mitochondrial membrane potential, but not mitochondrial mass or DNA.

Conclusions:

  • Ionizing radiation specifically enhances mitochondrial gene expression and activity in glioblastoma cells.
  • Oxidative stress is a key mechanism linking radiation exposure to altered mitochondrial gene expression.
  • Mitochondria are implicated as signaling targets for ionizing radiation and oxidants.