| Comparison of Two Ultrasmall Superparamagnetic Iron Oxides on Cytotoxicity and MR Imaging of Tumors. | |
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MedLine Citation:
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PMID: 22272221 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Purpose: This study was performed to compare the cytotoxicity and magnetic resonance (MR) contrast in diverse cultured cells and xenograft tumors models of two ultra-small superparamagnetic iron oxides (USPIOs), thermally cross-linked superparamagnetic iron oxide nanoparticles (TCL-SPION) and monocrystalline iron oxide nanoparticles (MION-47).Materials and methods: Transmission electron microscopy (TEM) images and R(2) relaxivity values of the TCL-SPION and MION-47 were obtained and the cell viability and cell growth velocity of treated and untreated human fibroblasts and human umbilical vein endothelial cells (HUVEC) were evaluated. The effect of TCL-SPION and MION-47 on the secretion of interlukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α), the production of nitric oxides and the mitochondrial membrane potentials in murine macrophage cells (RAW264.7) was compared. Human hepatocellular carcinoma cells (HepG2, 5x10(5)) were subcutaneously injected into nude mice (BALB/c) and in vivo MR imaging of tumors before and after injection with TCL-SPION or MION-47 (12.5 mg Fe/kg) was performed on a 1.5 Tesla MRI scanner.Results: On TEM images, the average core diameter of TCL-SPION was 9 nm whereas that of MION-47 was 5 nm. TCL- SPION (345.0 ± 6.2 mM(-1)sec(-1)) had higher relaxivity (R(2)) than MION-47 (130.7 ± 1.1 mM(-1)sec(-1)). Significant changes in cell viability and growth were not found in human fibroblasts and HUVEC exposed to TCL-SPION and MION-47. However, IL-6 and TNF-α secretions increased dose-dependently and significantly in the macrophages treated with MION-47 or TCL-SPION. TCL-SPION had a lower stimulatory effect on IL-6 secretions than did MION-47 (P <0.05) and nitric oxides were produced in the macrophages by MION-47 but not TCL-SPION. A change in the mitochondrial membrane potential of the macrophages was observed 24 hours after the exposure, and MION-47 induced more collapses of the mitochondrial membrane potential than did TCL-SPION. In the in vivo MR imaging, 33.0 ± 1.3% and 7.5 ± 0.4% signal intensity decrease on T(2)*-weighted images was observed in the tumors injected with TCL-SPION and MION-47, respectively.Conclusion: Due to the modified surface properties and larger core size of its iron oxide nanoparticles, TCL-SPION achieves lower cytotoxicity and better tumor MR contrast than MION-47. Our study suggests that TCL-SPION may be used as a new platform for tumor imaging and therapy monitoring. |
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Authors:
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Mulan Li; Hoe Suk Kim; Lianji Tian; Mi Kyung Yu; Sangyong Jon; Woo Kyung Moon |
Publication Detail:
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Type: Journal Article Date: 2012-01-01 |
Journal Detail:
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Title: Theranostics Volume: 2 ISSN: 1838-7640 ISO Abbreviation: Theranostics Publication Date: 2012 |
Date Detail:
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Created Date: 2012-01-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101552395 Medline TA: Theranostics Country: Australia |
Other Details:
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Languages: eng Pagination: 76-85 Citation Subset: - |
Affiliation:
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1. Department of Radiology, Seoul National University Hospital, 101 Daehangno, Jongno-gu, Seoul 110-744, Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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