| In vivo MR quantification of superparamagnetic iron oxide nanoparticle leakage during low-frequency-ultrasound-induced blood-brain barrier opening in swine. | |
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MedLine Citation:
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PMID: 21965168 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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PURPOSE: To verify that low-frequency planar ultrasound can be used to disrupt the BBB in large animals, and the usefulness of MRI to quantitatively monitor the delivery of superparamagnetic iron oxide (SPIO) nanoparticles into the disrupted regions. MATERIALS AND METHODS: Two groups of swine subjected to craniotomy were sonicated with burst lengths of 30 or 100 ms, and one group of experiment was also performed to confirm the ability of 28-kHz sonication to open the BBB transcranially. SPIO nanoparticles were administered to the animals after BBB disruption. Procedures were monitored by MRI; SPIO concentrations were estimated by relaxivity mapping. RESULTS: Sonication for 30 ms created shallow disruptions near the probe tip; 100-ms sonications after craniotomy can create larger and more penetrating openings, increasing SPIO leakage ∼3.6-fold than 30-ms sonications. However, this was accompanied by off-target effects possibly caused by ultrasonic wave reflection. SPIO concentrations estimated from transverse relaxation rate maps correlated well with direct measurements of SPIO concentration by optical emission spectrometry. We have also shown that transcranial low-frequency 28-kHz sonication can induce secure BBB opening from longitudinal MR image follow up to 7 days. CONCLUSION: This study provides valuable information regarding the use low-frequency ultrasound for BBB disruption and suggest that SPIO nanoparticles has the potential to serve as a thernostic agent in MRI-guided ultrasound-enhanced brain drug delivery. J. Magn. Reson. Imaging 2011;. © 2011 Wiley-Liss, Inc. |
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Authors:
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Hao-Li Liu; Pin-Yuan Chen; Hung-Wei Yang; Jia-Shin Wu; I-Chou Tseng; Yan-Jung Ma; Chih-Ying Huang; Hong-Chieh Tsai; Shu-Mei Chen; Yu-Jen Lu; Chiung-Yin Huang; Mu-Yi Hua; Yunn-Hwa Ma; Tzu-Chen Yen; Kuo-Chen Wei |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-30 |
Journal Detail:
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Title: Journal of magnetic resonance imaging : JMRI Volume: - ISSN: 1522-2586 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-10-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9105850 Medline TA: J Magn Reson Imaging Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Wiley-Liss, Inc. |
Affiliation:
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Department of Electrical Engineering, Chang-Gung University, Taoyuan, Taiwan; Molecular Imaging Center, Chang-Gung Memorial Hospital, Taoyuan, Taiwan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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