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Histological study of the biodynamics of iron oxide nanoparticles with different diameters

Authors Tsuchiya K, Nitta N, Sonoda A, Nitta-Seko A, Ohta S, Otani H, Takahashi M, Murata K, Murase K, Nohara S, Mukaisho K

Published 2 August 2011 Volume 2011:6 Pages 1587—1594

DOI http://dx.doi.org/10.2147/IJN.S22189

Review by Single-blind

Peer reviewer comments 4

Keiko Tsuchiya1, Norihisa Nitta1, Akinaga Sonoda1, Ayumi Nitta-Seko1, Shinichi Ohta1, Hideji Otani1, Masashi Takahashi1, Kiyoshi Murata1, Katsutoshi Murase2, Satoshi Nohara2, Kenichi Mukaisho3
1Department of Radiology, Shiga University of Medical Science, Otsu, Shiga, 2The Nagoya Research Laboratory, Meito Sangyo Co, Ltd, Kiyosu, Aichi, 3Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, Japan

Abstract: The biodynamics of ultrasmall and small superparamagnetic iron oxide (USPIO and SPIO, respectively) particles that were injected intraperitoneally into 36 C57BL/6 mice were investigated chronologically. Their distribution was studied histologically at six time points by measuring iron-positive areas (µm2) in organ sections stained with Prussian blue. The uptake of the differently sized particles was also compared by cultured murine macrophages (J774.1). Iron-positive areas in the liver were significantly larger in the mice injected with USPIO than those injected with SPIO at the first three time points (P < 0.05). The amount of USPIO in the lung parenchyma around the airway was larger than that of SPIO at four time points (P < 0.05); distribution to the lymph nodes was not significantly different. The amount of iron was significantly larger in SPIO- than USPIO-treated cultured cells (P < 0.05). In conclusion, it is suggested that intra peritoneally injected USPIO particles could be used more quickly than SPIO to make Kupffer images of the liver and that both agents could help get lymph node images of similar quality.

Keywords: USPIO, SPIO, contrast agent, biodistribution, histology

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