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AAPS PharmSciTech

, Volume 19, Issue 2, pp 621–633 | Cite as

Magnetic Nanoparticles for the Delivery of Dapagliflozin to Hypoxic Tumors: Physicochemical Characterization and Cell Studies

  • Athina Angelopoulou
  • Efstathia Voulgari
  • Argiris Kolokithas-Ntoukas
  • Aristides Bakandritsos
  • Konstantinos Avgoustakis
Research Article
  • 268 Downloads

Abstract

In solid tumors, hypoxia (lack of oxygen) is developed, which leads to the development of resistance of tumor cells to chemotherapy and radiotherapy through various mechanisms. Nevertheless, hypoxic cells are particularly vulnerable when glycolysis is inhibited. For this reason, in this study, the development of magnetically targetable nanocarriers of the sodium-glucose transporter protein (SGLT2) inhibitor dapagliflozin (DAPA) was developed for the selective delivery of DAPA in tumors. This nanomedicine in combination with radiotherapy or chemotherapy should be useful for effective treatment of hypoxic tumors. The magnetic nanoparticles consisted of a magnetic iron oxide core and a poly(methacrylic acid)-graft-poly(ethyleneglycol methacrylate) (PMAA-g-PEGMA) polymeric shell. The drug (dapagliflozin) molecules were conjugated on the surface of these nanoparticles via in vivo hydrolysable ester bonds. The nanoparticles had an average size of ~ 70 nm and exhibited a DAPA loading capacity 10.75% (w/w) for a theoretical loading 21.68% (w/w). The magnetic responsiveness of the nanoparticles was confirmed with magnetophoresis experiments. The dapagliflozin-loaded magnetic nanoparticles exhibited excellent colloidal stability in aqueous and biological media. Minimal (less than 15% in 24 h) drug release from the nanoparticles occurred in physiological pH 7.4; however, drug release was significantly accelerated in pH 5.5. Drug release was also accelerated (triggered) under the influence of an alternating magnetic field. The DAPA-loaded nanoparticles exhibited higher in vitro anticancer activity (cytotoxicity) against A549 human lung cancer cells than free DAPA. The application of an external magnetic field gradient increased the uptake of nanoparticles by cells, leading to increased cytotoxicity. The results justify further in vivo studies of the suitability of DAPA-loaded magnetic nanoparticles for the treatment of hypoxic tumors.

KEY WORDS

dapagliflozin magnetic nanoparticles hypoxia tumor drug targeting cytotoxicity 

Notes

Acknowledgements

This research was supported by the “ΙΚΥ FELLOWSHIPS OF EXCELLENCE FOR POSTGRADUATE STUDIES IN GREECE – SIEMENS PROGRAM”. The authors would like to thank the Advanced Light Microscopy facility of the Department of Physiology, School of Medicine, University of Patras, especially Dr. Argiro Kalogeropoulou, and Professor Stavros Taraviras, for their help with the confocal microscopy.

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Copyright information

© American Association of Pharmaceutical Scientists 2017

Authors and Affiliations

  • Athina Angelopoulou
    • 1
  • Efstathia Voulgari
    • 1
  • Argiris Kolokithas-Ntoukas
    • 2
  • Aristides Bakandritsos
    • 3
  • Konstantinos Avgoustakis
    • 1
  1. 1.Department of Pharmacy, Medical SchoolUniversity of PatrasPatrasGreece
  2. 2.Department of Materials ScienceUniversity of PatrasPatrasGreece
  3. 3.Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of SciencePalacky University in OlomoucOlomoucCzech Republic

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