Starch nanoparticles for delivery of the histone deacetylase inhibitor CG-1521 in breast cancer treatment
Received 23 October 2018
Accepted for publication 24 January 2019
Published 20 February 2019 Volume 2019:14 Pages 1335—1346
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Cristina Weinberg
Peer reviewer comments 2
Editor who approved publication: Dr Thomas Webster
Esma Alp,1–4 Fehmi Damkaci,2 Eylem Guven,1 Martin Tenniswood3,4
1Department of Nanotechnology and Nanomedicine, Hacettepe University, Beytepe, Ankara 06800, Turkey; 2Department of Chemistry, State University of New York at Oswego, Oswego, NY 13126, USA; 3Cancer Research Center, Rensselaer, NY 12144, USA; 4Department of Biomedical Sciences, State University of New York, University at Albany, Rensselaer, NY 12144, USA
Background: The efficacy of epigenetic drugs, such as histone deacetylase inhibitors, is often diminished by poor aqueous solubility resulting in limited bioavailability and a low therapeutic index. To overcome the suboptimal therapeutic index, we have developed a biocompatible starch nanoparticle formulation of CG-1521, a histone deacetylase inhibitor in preclinical development for hard-to-treat breast cancers, which improves its bioavailability and half-life.
Methods: The physicochemical parameters (size, zeta potential, morphology, loading, and release kinetics) of these nanoparticles (CG-NPs) have been optimized and their cytotoxic and apoptotic capacities measured in MCF-7 breast cancer cell line. The mechanism of action of the encapsulated drug was compared with the free drug at molecular level.
Results: We show that encapsulation of CG-1521 substantially reduces the release rate of drug and provides a significantly enhanced cytotoxic ability of nanoparticles compared with equivalent dose of free CG-1521. CG-NPs induced cell cycle arrest and significant apoptosis in MCF-7 cells in vitro. The biological action of encapsulated drug has the similar impact with free drug on gene expression.
Conclusion: The findings suggest that encapsulation of CG-1521 into starch nanoparticles can improve drug delivery of histone deacetylase inhibitors for breast cancer therapy without interfering with the mechanism of action of the drug.
Keywords: cell cycle, apoptosis, DNA fragmentation, gene expression, epigenetics, MCF-7
This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.Download Article [PDF] View Full Text [HTML][Machine readable]