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pH-Dependent Adsorption Release of Doxorubicin on MamC-Biomimetic Magnetite Nanoparticles

García Rubia, Germán, Peigneux, Ana, Jabalera, Ylenia, Puerma, Javier, Oltolina, Francesca, Elert, Kerstin, Colangelo, Donato, Gómez Morales, Jaime, Prat, Maria, Jimenez-Lopez, Concepcion·2018·Langmuir

Abstract

New biomimetic magnetite nanoparticles (hereafter BMNPs) with sizes larger than most common superparamagnetic nanoparticles were produced in the presence of the recombinant MamC protein from Magnetococcus marinus MC-1 and functionalized with doxorubicin (DOXO) intended as potential drug nanocarriers. Unlike inorganic magnetite nanoparticles, in BMNPs the MamC protein controls their size and morphology, providing them with magnetic properties consistent with a large magnetic moment per particle; moreover, it provides the nanoparticles with novel surface properties. BMNPs display the isoelectric point at pH 4.4, being strongly negatively charged at physiological pH (pH 7.4). This allows both (i) their functionalization with DOXO, which is positively charged at pH 7.4, and (ii) the stability of the DOXO-surface bond and DOXO release to be pH dependent and governed by electrostatic interactions. DOXO adsorption follows a Langmuir-Freundlich model, and the coupling of DOXO to BMNPs (binary biomimetic nanoparticles) is very stable at physiological pH (maximum release of 5% of the drug adsorbed). Conversely, when pH decreases, these electrostatic interactions weaken, and at pH 5, DOXO is released up to ∼35% of the amount initially adsorbed. The DOXO-BMNPs display cytotoxicity on the GTL-16 human gastric carcinoma cell line in a dose-dependent manner, reaching about ∼70% of mortality at the maximum amount tested, while the nonloaded BMNPs are fully cytocompatible. The present data su…

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Metadata

Authors
García Rubia, G., Peigneux, A., Jabalera, Y., Puerma, J., Oltolina, F., Elert, K., Colangelo, D., Gómez Morales, J., Prat, M., & Jimenez-Lopez, C.
Affiliations
  • Dipartimento di Scienze della Salute, Università del Piemonte Orientale “A. Avogadro”, Via Solaroli 17, 28100 Novara, Italy
  • Laboratorio de Estudios Cristalográficos, IACT (CSIC-Universidad de Granada), Avda. Las Palmeras, 4, 18100 Armilla, Spain
Venue
Langmuir
Published
2018-11-05
Volume
34
Issue
45
Pages
13713-13724
ISSN
  • 0743-7463
  • 1520-5827
Cited by
53
References
1
Language
en
Funders
  • European Regional Development Fund (CGL2016-76723, CGL2013-46612)
  • Ministerio de Econom?a y Competitividad (CGL2013-46612, CGL2016-76723)
  • Universidad de Granada (UCE-PP2016-05)
  • Universit? degli Studi del Piemonte Orientale

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