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Persistent oxidative stress in chromosomally unstable cells.
Charles L Limoli1, Erich Giedzinski, William F Morgan
1Department of Radiation Oncology, University of California, San Francisco, CA 94103-0806, USA. Limoli@itsa.ucsf.edu
Cancer Research
|June 18, 2003
Summary
Genomic instability in cells is linked to chronic oxidative stress. Dysfunctional mitochondria contribute to elevated reactive oxygen species (ROS), perpetuating this instability without increasing DNA base damage.
Area of Science:
- Cell Biology
- Genetics
- Biochemistry
Background:
- Exposure to DNA damaging agents can cause persistent chromosomal destabilization in human-hamster hybrid cells.
- Understanding the biochemical mechanisms behind this unstable phenotype is crucial for genomic stability research.
Purpose of the Study:
- To investigate the role of oxidative stress in perpetuating genomic instability.
- To determine if mitochondria are a source of reactive oxygen species (ROS) in unstable cell clones.
Main Methods:
- Analysis of stable and unstable cell clones derived from progenitor cells exposed to radiation or chemicals.
- Measurement of reactive oxygen species (ROS) using fluorogenic dyes and fluorescence automated cell sorting.
- Assessment of mitochondrial content and function using nonyl acridine orange and rhodamine 123, respectively.
Main Results:
- Unstable clones exhibited significantly higher levels of ROS compared to stable clones.
- Unstable clones showed an increased number of dysfunctional mitochondria, evidenced by higher nonyl acridine orange and lower rhodamine 123 fluorescence.
- No significant increase in oxidative base damage to nuclear DNA was observed in unstable clones.
Conclusions:
- Chronic oxidative stress, partly originating from dysfunctional mitochondria, is implicated in the perpetuation of genomic instability phenotypes.
- The study highlights a link between mitochondrial dysfunction, ROS production, and chromosomal instability.
Keywords:
Non-programmatic