Details

Autor(en) / Beteiligte

• You, Dong Gil
• Saravanakumar, Gurusamy
• Son, Soyoung
• Han, Hwa Seung
• Heo, Roun
• Kim, Kwangmeyung
• Kwon, Ick Chan
• Lee, Jun Young
• Park, Jae Hyung

Titel

Dextran sulfate-coated superparamagnetic iron oxide nanoparticles as a contrast agent for atherosclerosis imaging

Ist Teil von

• Carbohydrate polymers, 2014-01, Vol.101, p.1225-1233

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2014

Quelle

MEDLINE

Beschreibungen/Notizen

• •Dextran sulfate-b-poly(glycerol methacrylate) (DS-b-PGMA) copolymer is synthesized.•DS-coated superparamagnetic iron oxide nanoparticles (DS-SPIONs) were prepared.•DS-SPIONs showed high stability due to robust anchoring of PGMA segment on SPIONs.•DS-SPIONs were taken up by activated macrophages via receptor-mediated endocytosis.•DS-SPIONs produced contrast enhancement in the T2-weighted MR cellular imaging. The hallmark of atherosclerosis in its early pathogenic process is the overexpression of class A scavenger receptors (SR-A) by activated macrophages. In this study, dextran sulfate-coated superparamagnetic iron oxide nanoparticles (DS-SPIONs), as a magnetic resonance (MR) imaging contrast agent of atherosclerosis, was prepared via the facile co-precipitation method using a versatile double-hydrophilic block copolymer comprising of a DS segment (ligand for SR-A) and a poly(glyclerol methacrylate) segment (SPIONs surface-anchoring unit). The physicochemical properties of the DS-SPIONs were investigated using various instruments. DS-SPIONs exhibited high aqueous stability compared to dextran-coated SPIONs (Dex-SPIONs), which were used as controls. The cellular uptake behaviors of DS-SPIONs and Dex-SPIONs were evaluated using Prussian blue assay. Interestingly, the DS-SPIONs were effectively taken up by activated macrophages compared to Dex-SPIONs. However, the cellular uptake of DS-SPIONs by activated macrophages was remarkably reduced in the presence of free DS. These results suggest that activated macrophages internalize DS-SPIONs via receptor (SR-A)-mediated endocytosis. T2-weighted MR imaging of the cells demonstrated that activated macrophages treated with DS-SPIONs showed a significantly lower signal intensity compared to those treated with Dex-SPIONs. Overall, these results suggest that DS-SPIONs may be utilized as a potential contrast agent for atherosclerosis MR imaging.