MiRNAs-181a/b as Predictive biomarkers for olaparib sensitivity in triple-negative breast cancer cells.
Ashmawy, A., Sheta, M., Zahran, F., Abdel Wahab, A. (2017). MiRNAs-181a/b as Predictive biomarkers for olaparib sensitivity in triple-negative breast cancer cells.. EKB Journal Management System, 13(1), 221-229. doi: 10.21608/blj.2017.47612
Abeer M. Ashmawy; Mona A. Sheta; Faten Zahran; Abdel Hady A. Abdel Wahab. "MiRNAs-181a/b as Predictive biomarkers for olaparib sensitivity in triple-negative breast cancer cells.". EKB Journal Management System, 13, 1, 2017, 221-229. doi: 10.21608/blj.2017.47612
Ashmawy, A., Sheta, M., Zahran, F., Abdel Wahab, A. (2017). 'MiRNAs-181a/b as Predictive biomarkers for olaparib sensitivity in triple-negative breast cancer cells.', EKB Journal Management System, 13(1), pp. 221-229. doi: 10.21608/blj.2017.47612
Ashmawy, A., Sheta, M., Zahran, F., Abdel Wahab, A. MiRNAs-181a/b as Predictive biomarkers for olaparib sensitivity in triple-negative breast cancer cells.. EKB Journal Management System, 2017; 13(1): 221-229. doi: 10.21608/blj.2017.47612

MiRNAs-181a/b as Predictive biomarkers for olaparib sensitivity in triple-negative breast cancer cells.

Biochemistry Letters
Article 18, Volume 13, Issue 1, 2017, Page 221-229  XML PDF (773.24 K)
Document Type: Original Article
DOI: 10.21608/blj.2017.47612
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Authors
Abeer M. Ashmawy1; Mona A. Sheta1; Faten Zahran2; Abdel Hady A. Abdel Wahab1
1Department of Cancer Biology, National Cancer Institute, Cairo University, Cairo 11796, Egypt.
2Chemistry Department, Faculty of Science, Zagazig University, Egypt.
Abstract
 




 Background: spotting the scope on triple-negative breast cancer (TNBC) as the most aggressive type of breast cancer, with no targeted therapeutic options. TNBC is often characterized by having defects in DNA repair due to defects in BRCA making this cancer a rational target for the synthetic lethality of olaparib, as an inhibitory target agent of the alternative DNA repair pathway (poly ADP-ribose polymerase “PARP” inhibitor). Objectives: the present study aims to evaluate the value of miRNAs-181a/b as potential biomarkers in predicting the response of TNBC to olaparib. Methods: anti-miRNAs-181a/b was transfected into MDA-MB-231 cell line using HiPerFect transfection reagent, the transfected and untransfected cells were subjected to olaparib. The effect of miRNAs-181a/b on MDA-MB-231 treated cells with olaparib was evaluated through the detection of essential proteins involved in apoptosis and cell proliferation including Caspase-8, Bcl-2, and Ki-67. Further, the expression level of ataxia telangiectasia mutated (ATM) was determined as a functional target of miRNAs-181a/b. Results: a significant decrease in Caspase-8 activity, and Bcl-2, but a significant increase in cell survival, cell proliferation, and ATM protein were observed upon suppression of miRNAs-181a/b by their inhibitors followed by treatment with olaparib for TNBC cell line (MDA-MB-231 cells). Conclusions: our data confirmed that miRNA-181a and miRNA-181b play a critical role for detecting the sensitivity of TNBC cells to olaparib. As well as miRNAs-181a/b could be used as a potentially predictive biomarkers for response to olaparib. 
Keywords
TNBC; miRNAs-181a/b; Olaparib; PARP; Caspase-8; Bcl-2; Ki-67; and ATM
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