c-Myc and DNA Damage in Breast Cells
Author Information
Author(s): Sheen J-H, Woo J-K, Dickson R B
Primary Institution: Georgetown University Medical Center
Hypothesis
The overexpression of c-Myc may alter the G2/M arrest, following DNA damage, leading to an inappropriate entry of damaged chromosomes into mitosis.
Conclusion
c-Myc-overexpressing cells are selectively sensitive to DNA damage-induced apoptosis and exhibit altered G2/M checkpoint control.
Supporting Evidence
- Overexpression of c-Myc leads to high levels of cyclin B1, which is associated with inappropriate cell cycle progression.
- c-Myc-overexpressing cells showed a significant number of mitotic cells after γ-irradiation, indicating altered checkpoint control.
- Normal HMECs with c-Myc overexpression eventually undergo apoptosis following DNA damage.
Takeaway
When cells have too much c-Myc, they can get confused and skip important steps when they are damaged, which can lead to problems like cell death.
Methodology
The study used a mitotic-arrest assay to measure G2/M entry following DNA damage in normal human mammary epithelial cells.
Participant Demographics
Normal human mammary epithelial cells derived from reduction mammoplasty tissues.
Digital Object Identifier (DOI)
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