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Mol Cancer Res. 2019 Jan 7. pii: molcanres.0782.2018. doi: 10.1158/1541-7786.MCR-18-0782. [Epub ahead of print]

Mechanochemical disruption suppresses metastatic phenotype and pushes prostate cancer cells toward apoptosis.

Author information

1
Department of Biomedical Engineering, Tulane University.
2
Pathology and Laboratory Medicine, Tulane University School of Medicine.
3
Department of Biomedical Engineering, Tulane University damir@tulane.edu.

Abstract

Chemical-based medicine that targets specific oncogenes or proteins often leads to cancer recurrence due to tumor heterogeneity and development of chemoresistance. This challenge can be overcome by mechanochemical disruption of cancer cells via focused ultrasound (FUS) and sensitizing chemical agents such as ethanol. We demonstrate that this disruptive therapy decreases the viability, proliferation rate, tumorigenicity, endothelial adhesion, and migratory ability of prostate cancer cells in vitro. It sensitized the cells to TNFR1- and Fas-mediated apoptosis and reduced the expression of metastatic markers CD44 and CD29. Using a prostate cancer xenograft model, we observed that the mechanochemical disruption led to complete tumor regression in vivo. This switch to a non-aggressive cell phenotype was caused by ROS and Hsp70 overproduction and subsequent impairment of NF-κB signaling. FUS induces mechanical perturbations of diverse cancer cell populations, and its combination with agents that amplify and guide remedial cellular responses can stop lethal cancer progression. Implications: Mechanochemical disruption (MCD) therapy in which FUS is combined with ethanol can be curative for locally aggressive and castration-resistant prostate cancer.

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