Back to Search
Start Over
Differential DNA damage repair and PARP inhibitor vulnerability of the mammary epithelial lineages
- Source :
- Cell Reports; October 2023, Vol. 42 Issue: 10
- Publication Year :
- 2023
-
Abstract
- It is widely assumed that all normal somatic cells can equally perform homologous recombination (HR) and non-homologous end joining in the DNA damage response (DDR). Here, we show that the DDR in normal mammary gland inherently depends on the epithelial cell lineage identity. Bioinformatics, post-irradiation DNA damage repair kinetics, and clonogenic assays demonstrated luminal lineage exhibiting a more pronounced DDR and HR repair compared to the basal lineage. Consequently, basal progenitors were far more sensitive to poly(ADP-ribose) polymerase inhibitors (PARPis) in both mouse and human mammary epithelium. Furthermore, PARPi sensitivity of murine and human breast cancer cell lines as well as patient-derived xenografts correlated with their molecular resemblance to the mammary progenitor lineages. Thus, mammary epithelial cells are intrinsically divergent in their DNA damage repair capacity and PARPi vulnerability, potentially influencing the clinical utility of this targeted therapy.
Details
- Language :
- English
- ISSN :
- 22111247
- Volume :
- 42
- Issue :
- 10
- Database :
- Supplemental Index
- Journal :
- Cell Reports
- Publication Type :
- Periodical
- Accession number :
- ejs64142073
- Full Text :
- https://doi.org/10.1016/j.celrep.2023.113256