ATM Activation and H2AX Phosphorylation in A549 Cells Exposed to Tobacco Smoke
Author Information
Author(s): Tanaka Toshiki, Huang Xuan, Jorgensen Ellen, Gietl Diana, Traganos Frank, Darzynkiewicz Zbigniew, Albino Anthony P
Primary Institution: Brander Cancer Research Institute and Department of Pathology, New York Medical College
Hypothesis
Does exposure to cigarette smoke activate ATM and induce H2AX phosphorylation in A549 cells?
Conclusion
The study found that ATM activation is associated with H2AX phosphorylation in response to DNA damage caused by cigarette smoke.
Supporting Evidence
- ATM activation was confirmed by detecting its phosphorylation on Ser1981.
- H2AX phosphorylation was measured as a marker of DNA double-strand breaks.
- The correlation between ATM activation and H2AX phosphorylation was strong (R = 0.89).
- Caffeine reduced the levels of both ATM-S1981P and γH2AX, suggesting ATM's role in H2AX phosphorylation.
Takeaway
When lung cells are exposed to cigarette smoke, a protein called ATM gets activated, which helps mark DNA damage by adding a special tag to another protein called H2AX.
Methodology
A549 cells were exposed to cigarette smoke, and ATM activation and H2AX phosphorylation were assessed using immunocytochemistry and Western blotting.
Limitations
The study primarily focused on one cell line and did not explore the long-term effects of cigarette smoke exposure.
Participant Demographics
Human pulmonary adenocarcinoma A549 cells were used in the study.
Statistical Information
P-Value
0.89
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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