TR
EN
Synergistic effect of RAD50 downregulation on combination of rucaparib and doxorubicin
Abstract
Aim: The MRN (MRE11-RAD50-NBS1) protein complex functions as a DNA damage sensor and
plays essential roles to coordinate the repair of DNA double-strand breaks. Although dysfunctional
MRN activity has been shown to sensitize cancer cells to certain DNA-damaging agents or PARP
inhibitors, the functional significance of RAD50 upon rucaparib and doxorubicin treatments has yet to
be studied. The aim of this research was to investigate the response of RAD50-defective cancer cells
toward the combination of rucaparib and doxorubicin.
Materials and Methods: Human bone osteosarcoma epithelial cells (U2OS) were used in this study
to assess the therapeutic potential of RAD50 expression levels. The RNA interference technology was
applied to silence the expression of the RAD50 mRNA activity. The qRT-PCR technique was used to
investigate the mRNA expression levels of the relevant genes. Western blotting analysis was
conducted to assess the relevant protein expression levels. Clonogenic survival assay was performed
to dissect the effect of RAD50-loss on the rucaparib and doxorubicin combination treatment.
Results: RAD50 knockdown resulted in a significant decrease in MRE11 and NBS1 protein levels,
whereas it did not affect p53 and p21 expressions at mRNA and protein levels. Furthermore, the cells
with RAD50-loss had impaired DNA damage response activation against acute doxorubicin treatment.
We finally showed that RAD50 depletion increased the cytotoxicity of doxorubicin when combined with
the PARP inhibitor rucaparib.
Conclusion: Taken together, our preclinical findings suggest that RAD50 expression levels can be
explored as a predictive biomarker in the evaluation for precision cancer treatments involving PARP
inhibitors.
Keywords
References
- Lindahl T, Barnes DE. Repair of endogenous DNA damage. Cold Spring Harb Symp Quant Biol. 2000;65:127–33.
- Ciccia A, Elledge SJSJ, Adamo A, Collis SJ, Adelman CA, Silva N, et al. The DNA Damage Response: Making It Safe to Play with Knives. Mol Cell. 2010 Oct;40(2):179–204.
- Vilenchik MM, Knudson AG. Endogenous DNA double-strand breaks: Production, fidelity of repair, and induction of cancer. Proc Natl Acad Sci. 2003 Oct;100(22):12871–6.
- Jackson, S. P. 2002. "Sensing and repairing DNA double-strand breaks". Carcinogenesis, 23(5), 687–696.
- Goodarzi AA, Jeggo PA. The Repair and Signaling Responses to DNA Double-Strand Breaks. In: Advances in genetics. 2013. p. 1–45.
- Hanahan, D., Weinberg, R. A. 2011. "Hallmarks of cancer: the next generation.". Cell, 144(5), 646–674.
- Khanna KK, Jackson SP. DNA double-strand breaks: signaling, repair and the cancer connection. Nat Genet. 2001 Mar;27(3):247–54.
- Wei Dai, Y. Y. 2014. "Genomic Instability and Cancer". Journal of Carcinogenesis & Mutagenesis, 05(02), 1– 13.
Details
Primary Language
English
Subjects
Health Care Administration
Journal Section
Research Article
Publication Date
June 12, 2023
Submission Date
August 11, 2022
Acceptance Date
December 7, 2022
Published in Issue
Year 2023 Volume: 62 Number: 2
APA
Gundogdu, R., Erdoğan, M. K., Sever, A., & Toy, Y. (2023). Synergistic effect of RAD50 downregulation on combination of rucaparib and doxorubicin. Ege Tıp Dergisi, 62(2), 289-300. https://doi.org/10.19161/etd.1160550
AMA
1.Gundogdu R, Erdoğan MK, Sever A, Toy Y. Synergistic effect of RAD50 downregulation on combination of rucaparib and doxorubicin. EJM. 2023;62(2):289-300. doi:10.19161/etd.1160550
Chicago
Gundogdu, Ramazan, Mehmet Kadir Erdoğan, Aydın Sever, and Yusuf Toy. 2023. “Synergistic Effect of RAD50 Downregulation on Combination of Rucaparib and Doxorubicin”. Ege Tıp Dergisi 62 (2): 289-300. https://doi.org/10.19161/etd.1160550.
EndNote
Gundogdu R, Erdoğan MK, Sever A, Toy Y (June 1, 2023) Synergistic effect of RAD50 downregulation on combination of rucaparib and doxorubicin. Ege Tıp Dergisi 62 2 289–300.
IEEE
[1]R. Gundogdu, M. K. Erdoğan, A. Sever, and Y. Toy, “Synergistic effect of RAD50 downregulation on combination of rucaparib and doxorubicin”, EJM, vol. 62, no. 2, pp. 289–300, June 2023, doi: 10.19161/etd.1160550.
ISNAD
Gundogdu, Ramazan - Erdoğan, Mehmet Kadir - Sever, Aydın - Toy, Yusuf. “Synergistic Effect of RAD50 Downregulation on Combination of Rucaparib and Doxorubicin”. Ege Tıp Dergisi 62/2 (June 1, 2023): 289-300. https://doi.org/10.19161/etd.1160550.
JAMA
1.Gundogdu R, Erdoğan MK, Sever A, Toy Y. Synergistic effect of RAD50 downregulation on combination of rucaparib and doxorubicin. EJM. 2023;62:289–300.
MLA
Gundogdu, Ramazan, et al. “Synergistic Effect of RAD50 Downregulation on Combination of Rucaparib and Doxorubicin”. Ege Tıp Dergisi, vol. 62, no. 2, June 2023, pp. 289-00, doi:10.19161/etd.1160550.
Vancouver
1.Ramazan Gundogdu, Mehmet Kadir Erdoğan, Aydın Sever, Yusuf Toy. Synergistic effect of RAD50 downregulation on combination of rucaparib and doxorubicin. EJM. 2023 Jun. 1;62(2):289-300. doi:10.19161/etd.1160550