Metal-free and MRI visible theranostic lyotropic liquid crystal nitroxide-based nanoparticles.
Biomaterials
; 33(9): 2723-33, 2012 Mar.
Article
em En
| MEDLINE
| ID: mdl-22209558
ABSTRACT
The development of improved, low toxicity, clinically viable nanomaterials that provide MRI contrast have tremendous potential to form the basis of translatable theranostic agents. Herein we describe a class of MRI visible materials based on lyotropic liquid crystal nanoparticles loaded with a paramagnetic nitroxide lipid. These readily synthesized nanoparticles achieved enhanced proton-relaxivities on the order of clinically used gadolinium complexes such as Omniscan™ without the use of heavy metal coordination complexes. Their low toxicity, high water solubility and colloidal stability in buffer resulted in them being well tolerated in vitro and in vivo. The nanoparticles were initially screened in vitro for cytotoxicity and subsequently a defined concentration range was tested in rats to determine the maximum tolerated dose. Pharmacokinetic profiles of the candidate nanoparticles were established in vivo on IV administration to rats. The lyotropic liquid crystal nanoparticles were proven to be effective liver MRI contrast agents. We have demonstrated the effective in vivo performance of a T1 enhancing, biocompatible, colloidally stable, amphiphilic MRI contrast agent that does not contain a metal.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Imageamento por Ressonância Magnética
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Cristais Líquidos
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Nanopartículas
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Álcoois Graxos
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Metais
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Óxidos de Nitrogênio
Limite:
Animals
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Humans
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Male
Idioma:
En
Revista:
Biomaterials
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Austrália