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Published in: Breast Cancer Research 1/2021

01-12-2021 | Breast Cancer | Research article

Sublethal doxorubicin promotes migration and invasion of breast cancer cells: role of Src Family non-receptor tyrosine kinases

Authors: Samia Mohammed, Achraf A. Shamseddine, Benjamin Newcomb, Ronald S. Chavez, Tyler D. Panzner, Allen H. Lee, Daniel Canals, Chioma M. Okeoma, Christopher J. Clarke, Yusuf A. Hannun

Published in: Breast Cancer Research | Issue 1/2021

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Abstract

Background

Doxorubicin (Dox) is a widely used chemotherapy, but its effectiveness is limited by dose-dependent side effects. Although lower Dox doses reduce this risk, studies have reported higher recurrence of local disease with no improvement in survival rate in patients receiving low doses of Dox. To effectively mitigate this, a better understanding of the adverse effects of suboptimal Dox doses is needed.

Methods

Effects of sublethal dose of Dox on phenotypic changes were assessed with light and confocal microscopy. Migratory and invasive behavior were assessed by wound healing and transwell migration assays. MTT and LDH release assays were used to analyze cell growth and cytotoxicity. Flow cytometry was employed to detect cell surface markers of cancer stem cell population. Expression and activity of matrix metalloproteinases were probed with qRT-PCR and zymogen assay. To identify pathways affected by sublethal dose of Dox, exploratory RNAseq was performed and results were verified by qRT-PCR in multiple cell lines (MCF7, ZR75-1 and U-2OS). Regulation of Src Family kinases (SFK) by key players in DNA damage response was assessed by siRNA knockdown along with western blot and qRT-PCR. Dasatinib and siRNA for Fyn and Yes was employed to inhibit SFKs and verify their role in increased migration and invasion in MCF7 cells treated with sublethal doses of Dox.

Results

The results show that sublethal Dox treatment leads to increased migration and invasion in otherwise non-invasive MCF7 breast cancer cells. Mechanistically, these effects were independent of the epithelial mesenchymal transition, were not due to increased cancer stem cell population, and were not observed with other chemotherapies. Instead, sublethal Dox induces expression of multiple SFK—including Fyn, Yes, and Src—partly in a p53 and ATR-dependent manner. These effects were validated in multiple cell lines. Functionally, inhibiting SFKs with Dasatinib and specific downregulation of Fyn suppressed Dox-induced migration and invasion of MCF7 cells.

Conclusions

Overall, this study demonstrates that sublethal doses of Dox activate a pro-invasive, pro-migration program in cancer cells. Furthermore, by identifying SFKs as key mediators of these effects, our results define a potential therapeutic strategy to mitigate local invasion through co-treatment with Dasatinib.
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Metadata
Title
Sublethal doxorubicin promotes migration and invasion of breast cancer cells: role of Src Family non-receptor tyrosine kinases
Authors
Samia Mohammed
Achraf A. Shamseddine
Benjamin Newcomb
Ronald S. Chavez
Tyler D. Panzner
Allen H. Lee
Daniel Canals
Chioma M. Okeoma
Christopher J. Clarke
Yusuf A. Hannun
Publication date
01-12-2021
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 1/2021
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/s13058-021-01452-5

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