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Magnetic fluid hyperthermia enhances cytotoxicity of bortezomib in sensitive and resistant cancer cell lines

Authors Alvarez-Berríos MP, Castillo A, Rinaldi C, Torres-Lugo M

Received 12 July 2013

Accepted for publication 21 August 2013

Published 20 December 2013 Volume 2014:9(1) Pages 145—153

DOI https://doi.org/10.2147/IJN.S51435

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Merlis P Alvarez-Berríos,1 Amalchi Castillo,1 Carlos Rinaldi,1–3 Madeline Torres-Lugo1

1Department of Chemical Engineering, University of Puerto Rico, Mayagüez, Puerto Rico; 2J Crayton Pruitt Family Department of Biomedical Engineering, 3Department of Chemical Engineering, University of Florida, Gainesville, FL, USA

Abstract: The proteasome inhibitor bortezomib (BZ) has shown promising results in some types of cancer, but in others it has had minimal activity. Recent studies have reported enhanced efficacy of BZ when combined with hyperthermia. However, the use of magnetic nanoparticles to induce hyperthermia in combination with BZ has not been reported. This novel hyperthermia modality has shown better potentiation of chemotherapeutics over other types of hyperthermia. We hypothesized that inducing hyperthermia via magnetic nanoparticles (MFH) would enhance the cytotoxicity of BZ in BZ-sensitive and BZ-resistant cancer cells more effectively than hyperthermia using a hot water bath (HWH). Studies were conducted using BZ in combination with MFH in two BZ-sensitive cell lines (MDA-MB-468, Caco-2), and one BZ-resistant cell line (A2780) at two different conditions, ie, 43°C for 30 minutes and 45°C for 30 minutes. These experiments were compared with combined application of HWH and BZ. The results indicate enhanced potentiation between hyperthermic treatment and BZ. MFH combined with BZ induced cytotoxicity in sensitive and resistant cell lines to a greater extent than HWH under the same treatment conditions. The observation that MFH sensitizes BZ-resistant cell lines makes this approach a potentially effective anticancer therapy platform.

Keywords: magnetic fluid hyperthermia, hot water hyperthermia, BZ, enhanced cytotoxicity, thermal sensitization

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