Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes

Daniela Frascione,1 Clemens Diwoky,2 Gunter Almer,1,3 Peter Opriessnig,2 Caroline Vonach,1 Kerstin Gradauer,1 Gerd Leitinger,4 Harald Mangge,3 Rudolf Stollberger,2 Ruth Prassl1,51Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, Graz, Austria; 2Institute of Medical Engi...

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Autores principales:	Frascione D, Diwoky C, Almer G, Opriessnig P, Vonach C, Gradauer K, Leitinger G, Mangge H, Stollberger R, Prassl R
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2012
Materias:	Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/5d210a49cf4f4ee0b5a93da27a4a994a
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spelling	oai:doaj.org-article:5d210a49cf4f4ee0b5a93da27a4a994a2021-12-02T01:32:47ZUltrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes1176-91141178-2013https://doaj.org/article/5d210a49cf4f4ee0b5a93da27a4a994a2012-05-01T00:00:00Zhttp://www.dovepress.com/ultrasmall-superparamagnetic-iron-oxide-uspio-based-liposomes-as-magne-a9865https://doaj.org/toc/1176-9114https://doaj.org/toc/1178-2013Daniela Frascione,1 Clemens Diwoky,2 Gunter Almer,1,3 Peter Opriessnig,2 Caroline Vonach,1 Kerstin Gradauer,1 Gerd Leitinger,4 Harald Mangge,3 Rudolf Stollberger,2 Ruth Prassl1,51Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, Graz, Austria; 2Institute of Medical Engineering, University of Technology, Graz, Austria; 3Clinical Institute for Medical and Chemical Laboratory Diagnosis (CIMCL), Medical University, Graz, Austria; 4Institute of Cell Biology, Histology and Embryology, Medical University, Graz, Austria; 5Ludwig Boltzmann Institute for Lung Vascular Research, Graz, AustriaBackground: Magnetic liposomes (MLs) are phospholipid vesicles that encapsulate magnetic and/or paramagnetic nanoparticles. They are applied as contrast agents for magnetic resonance imaging (MRI). MLs have an advantage over free magnetic nanocores, in that various functional groups can be attached to the surface of liposomes for ligand-specific targeting. We have synthesized PEG-coated sterically-stabilized magnetic liposomes (sMLs) containing ultrasmall superparamagnetic iron oxides (USPIOs) with the aim of generating stable liposomal carriers equipped with a high payload of USPIOs for enhanced MRI contrast.Methods: Regarding iron oxide nanoparticles, we have applied two different commercially available surface-coated USPIOs; sMLs synthesized and loaded with USPIOs were compared in terms of magnetization and colloidal stability. The average diameter size, morphology, phospholipid membrane fluidity, and the iron content of the sMLs were determined by dynamic light scattering (DLS), transmission electron microscopy (TEM), fluorescence polarization, and absorption spectroscopy, respectively. A colorimetric assay using potassium thiocyanate (KSCN) was performed to evaluate the encapsulation efficiency (EE%) to express the amount of iron enclosed into a liposome. Subsequently, MRI measurements were carried out in vitro in agarose gel phantoms to evaluate the signal enhancement on T1- and T2-weighted sequences of sMLs. To monitor the biodistribution and the clearance of the particles over time in vivo, sMLs were injected in wild type mice.Results: DLS revealed a mean particle diameter of sMLs in the range between 100 and 200 nm, as confirmed by TEM. An effective iron oxide loading was achieved just for one type of USPIO, with an EE% between 74% and 92%, depending on the initial Fe concentration (being higher for lower amounts of Fe). MRI measurements demonstrated the applicability of these nanostructures as MRI probes.Conclusion: Our results show that the development of sMLs is strictly dependent on the physicochemical characteristics of the nanocores. Once established, sMLs can be further modified to enable noninvasive targeted molecular imaging.Keywords: magnetic liposomes, fluorescence polarization, biodistribution, MRI contrast agent&nbsp;Frascione DDiwoky CAlmer GOpriessnig PVonach CGradauer KLeitinger GMangge HStollberger RPrassl RDove Medical PressarticleMedicine (General)R5-920ENInternational Journal of Nanomedicine, Vol 2012, Iss default, Pp 2349-2359 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine (General) R5-920
spellingShingle	Medicine (General) R5-920 Frascione D Diwoky C Almer G Opriessnig P Vonach C Gradauer K Leitinger G Mangge H Stollberger R Prassl R Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes
description	Daniela Frascione,1 Clemens Diwoky,2 Gunter Almer,1,3 Peter Opriessnig,2 Caroline Vonach,1 Kerstin Gradauer,1 Gerd Leitinger,4 Harald Mangge,3 Rudolf Stollberger,2 Ruth Prassl1,51Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, Graz, Austria; 2Institute of Medical Engineering, University of Technology, Graz, Austria; 3Clinical Institute for Medical and Chemical Laboratory Diagnosis (CIMCL), Medical University, Graz, Austria; 4Institute of Cell Biology, Histology and Embryology, Medical University, Graz, Austria; 5Ludwig Boltzmann Institute for Lung Vascular Research, Graz, AustriaBackground: Magnetic liposomes (MLs) are phospholipid vesicles that encapsulate magnetic and/or paramagnetic nanoparticles. They are applied as contrast agents for magnetic resonance imaging (MRI). MLs have an advantage over free magnetic nanocores, in that various functional groups can be attached to the surface of liposomes for ligand-specific targeting. We have synthesized PEG-coated sterically-stabilized magnetic liposomes (sMLs) containing ultrasmall superparamagnetic iron oxides (USPIOs) with the aim of generating stable liposomal carriers equipped with a high payload of USPIOs for enhanced MRI contrast.Methods: Regarding iron oxide nanoparticles, we have applied two different commercially available surface-coated USPIOs; sMLs synthesized and loaded with USPIOs were compared in terms of magnetization and colloidal stability. The average diameter size, morphology, phospholipid membrane fluidity, and the iron content of the sMLs were determined by dynamic light scattering (DLS), transmission electron microscopy (TEM), fluorescence polarization, and absorption spectroscopy, respectively. A colorimetric assay using potassium thiocyanate (KSCN) was performed to evaluate the encapsulation efficiency (EE%) to express the amount of iron enclosed into a liposome. Subsequently, MRI measurements were carried out in vitro in agarose gel phantoms to evaluate the signal enhancement on T1- and T2-weighted sequences of sMLs. To monitor the biodistribution and the clearance of the particles over time in vivo, sMLs were injected in wild type mice.Results: DLS revealed a mean particle diameter of sMLs in the range between 100 and 200 nm, as confirmed by TEM. An effective iron oxide loading was achieved just for one type of USPIO, with an EE% between 74% and 92%, depending on the initial Fe concentration (being higher for lower amounts of Fe). MRI measurements demonstrated the applicability of these nanostructures as MRI probes.Conclusion: Our results show that the development of sMLs is strictly dependent on the physicochemical characteristics of the nanocores. Once established, sMLs can be further modified to enable noninvasive targeted molecular imaging.Keywords: magnetic liposomes, fluorescence polarization, biodistribution, MRI contrast agent&nbsp;
format	article
author	Frascione D Diwoky C Almer G Opriessnig P Vonach C Gradauer K Leitinger G Mangge H Stollberger R Prassl R
author_facet	Frascione D Diwoky C Almer G Opriessnig P Vonach C Gradauer K Leitinger G Mangge H Stollberger R Prassl R
author_sort	Frascione D
title	Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes
title_short	Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes
title_full	Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes
title_fullStr	Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes
title_full_unstemmed	Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes
title_sort	ultrasmall superparamagnetic iron oxide (uspio)-based liposomes as magnetic resonance imaging probes
publisher	Dove Medical Press
publishDate	2012
url	https://doaj.org/article/5d210a49cf4f4ee0b5a93da27a4a994a
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Ultrasmall superparamagnetic iron oxide (USPIO)-based liposomes as magnetic resonance imaging probes

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