Impact of Combination Therapy with Chemical Drugs and Megavoltage X-ray Exposure on Breast Cancer Stem Cells’ Viability and Proliferation of MCF-7 and MDA-MB-231 Cell Lines


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Abstract

Background::Breast Cancer (BC) is a serious malignancy among women. However, chemotherapy is an important tool for cancer treatments, but the long-term use of chemotherapy drugs may lead to drug resistance and tumor recurrence. Since Breast Cancer Stem Cells (BCSCs) can be the main factor to induce BC treatment resistance and recurrence, investigation of BCSCs signaling pathways can be an effective modality to enhance cancer treatment efficiency.

Objective::In this study, the effect of metformin, SB203580, and takinib alone or in combination with radiotherapy on MCF-7 and MDA-MB-231 breast cancer cell lines was evaluated.

Methods::MCF-7 and MDA-MB-231 breast cancer cell lines were treated with metformin, SB203580, and takinib for 24 or 48 hours, followed by X-ray exposure. The MTT assay and flow cytometry analysis were performed to assess cell growth inhibition and cellular death, CXCr4 expression, and BCSCs, respectively.

Results::The results showed the combination of takinib/SB203580 with radiotherapy to remarkably reduce the CXCR4 expression and BCSCs levels in the MCF-7 cell line. Also, the concurrent administration of takinib/metformin/radiotherapy significantly reduced BCSCs and CXCR4 metastatic markers in the MDA-MB- 231 cells. Since the MAPK signaling pathway has an important role in inducing drug resistance and cell proliferation, the use of SB203580 as an inhibitor of p38 MAPK can improve breast cancer treatment. Furthermore, metformin and ionizing radiation by suppression of the mTOR signaling pathway can control AMPK activation and cellular proliferation.

Conclusion::Anti-cancer and cytotoxic effects of metformin can be effective in this strategy. In conclusion, the combination of conventional chemotherapeutic drugs, including SB203580, metformin, and takinib with X-ray exposure can be a new approach to diminish the drug resistance of breast cancer.

About the authors

Fatemeh Banisharif Dehkordi

Cellular & Molecular Research Center, Shahrekord University of Medical Sciences

Email: info@benthamscience.net

Mahdi Ghatrehsamani

Cellular and Molecular Research Center, Shahrekord University of Medical Sciences

Email: info@benthamscience.net

Maryam Abdolvand

Cellular and Molecular Research Center, Shahrekord University of Medical Sciences

Email: info@benthamscience.net

Amin Soltani

Cellular and Molecular Research Center, Shahrekord University of Medical Sciences

Email: info@benthamscience.net

Seyed Hossein Masoumi

Medical Physics School of Allied Medical Sciences, Shahrekord University of Medical Sciences

Author for correspondence.
Email: info@benthamscience.net

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