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Magnetite-Gold nanohybrids as ideal all-in-one platforms for theranostics

  • Maria V. Efremova
  • , Victor A. Naumenko
  • , Marina Spasova
  • , Anastasiia S. Garanina
  • , Maxim A. Abakumov
  • , Anastasia D. Blokhina
  • , Pavel A. Melnikov
  • , Alexandra O. Prelovskaya
  • , Markus Heidelmann
  • , Zi-An Li
  • , Zheng Ma
  • , Igor V. Shchetinin
  • , Yuri I. Golovin
  • , Igor I. Kireev
  • , Alexander G. Savchenko
  • , Vladimir P. Chekhonin
  • , Natalia L. Klyachko
  • , Michael Farle
  • , Alexander G. Majouga
  • , Ulf Wiedwald

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

High-quality, 25 nm octahedral-shaped Fe 3 O 4 magnetite nanocrystals are epitaxially grown on 9 nm Au seed nanoparticles using a modified wet-chemical synthesis. These Fe 3 O 4 -Au Janus nanoparticles exhibit bulk-like magnetic properties. Due to their high magnetization and octahedral shape, the hybrids show superior in vitro and in vivo T 2 relaxivity for magnetic resonance imaging as compared to other types of Fe 3 O 4 -Au hybrids and commercial contrast agents. The nanoparticles provide two functional surfaces for theranostic applications. For the first time, Fe 3 O 4 -Au hybrids are conjugated with two fluorescent dyes or the combination of drug and dye allowing the simultaneous tracking of the nanoparticle vehicle and the drug cargo in vitro and in vivo. The delivery to tumors and payload release are demonstrated in real time by intravital microscopy. Replacing the dyes by cell-specific molecules and drugs makes the Fe 3 O 4 -Au hybrids a unique all-in-one platform for theranostics.

Original languageEnglish
Article number11295
Number of pages19
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - Dec 2018
Externally publishedYes

Funding

We thank Astrid M. Westendorf for fruitful discussions. The authors gratefully acknowledge the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» No. K2-2016-069 (synthesis of nanomaterials). U.W. gratefully acknowledges the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» № K3-2017-022 (magnetic measurements). V.A.N. gratefully acknowledges the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (№ K4-2017-046), implemented by a governmental decree dated 16th of March 2013, N 211 (intravital microscopy). The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the research project № 18-33-01232 (fluorescent labeling of nanoparticles). The authors also acknowledge financial support of Russian Science Foundation № 17-14-01316 (biological study) and Lomonosov Moscow State University Development Program PNR 5.13 (electron microscopy). MRI measurements were carried out by ClinScan 7 T (Bruker Biospin) located at CKP «Medical Nanobiotechnology». We acknowledge support by the Open Access Publication Fund of the University of Duisburg-Essen.

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