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NFκB regulates p21 expression and controls DNA damage-induced leukemic differentiation
Claudia M Nicolae1, Michael J O'Connor1, Daniel Constantin1
1Department of Biochemistry and Molecular Biology, The Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA, 17033, USA.
Oncogene
|April 7, 2018
Summary
DNA damage triggers myeloid leukemia cell differentiation via the NFκB pathway activating p21. This study reveals a new mechanism controlling cell fate, independent of p53.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- DNA damage significantly influences cell fate in normal and cancerous tissues.
- Myeloid leukemia cells undergo poorly understood terminal differentiation upon DNA damage exposure.
Purpose of the Study:
- To investigate the role of the NFκB pathway in DNA damage-induced myeloid differentiation.
- To elucidate the mechanism of p21 activation in response to DNA damage in leukemia cells.
Main Methods:
- Utilized CRISPR/Cas9 genome editing to ablate the NFκB binding site in the p21 promoter.
- Analyzed the impact of NFκB-mediated p21 activation on DNA damage-induced differentiation.
Main Results:
- Identified direct activation of the proliferation inhibitor p21 by the NFκB pathway in response to DNA damage.
- Demonstrated that NFκB-mediated p21 activation is crucial for DNA damage-induced myeloid differentiation.
Conclusions:
- Uncovered a novel p53-independent pathway for p21 activation.
- This pathway plays a critical role in regulating hematopoietic cell fate following DNA damage.
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