Get access

Assessment of cell infiltration in myocardial infarction: A dose-dependent study using micrometer-sized iron oxide particles

Authors

  • Yidong Yang,

    1. Small Animal Imaging, Department of Radiology, Georgia Health Sciences University, Augusta, Georgia, USA
    2. Nuclear and Radiological Engineering and Medical Physics Programs, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
    Search for more papers by this author
  • Jimei Liu,

    1. Small Animal Imaging, Department of Radiology, Georgia Health Sciences University, Augusta, Georgia, USA
    Search for more papers by this author
  • Yuhui Yang,

    1. Small Animal Imaging, Department of Radiology, Georgia Health Sciences University, Augusta, Georgia, USA
    Search for more papers by this author
  • Sang Hyun Cho,

    1. Nuclear and Radiological Engineering and Medical Physics Programs, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
    Search for more papers by this author
  • Tom C.-C. Hu

    Corresponding author
    1. Small Animal Imaging, Department of Radiology, Georgia Health Sciences University, Augusta, Georgia, USA
    2. Nuclear and Radiological Engineering and Medical Physics Programs, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
    • 330 Independence Ave SW, Room G644 (Switzer Bldg #3218), Washington, DC 20201
    Search for more papers by this author

Abstract

Myocardial infarction (MI) is a leading cause of death and disabilities. Inflammatory cells play a vital role in the process of postinfarction remodeling and repair. Inflammatory cell infiltration into the infarct site can be monitored using Tmath image-weighted MRI following an intravenous administration of iron oxide particles. In this study, various doses of micrometer-sized iron oxide particles (1.1–14.5 μg Fe/g body weight) were injected into the mouse blood stream before a surgical induction of MI. Cardiac MRIs were performed at 3, 7, 14, and 21 days postinfarction to monitor the signal attenuation at the infarct site. A dose-dependent phenomenon of signal attenuation was observed at the infarct site, with a higher dose leading to a darker signal. The study suggests an optimal temporal window for monitoring iron oxide particles-labeled inflammatory cell infiltration to the infarct site using MRI. The dose-dependent signal attenuation also indicates an optimal iron oxide dose of approximately 9.1–14.5 μg Fe/g body weight. A lower dose cannot differentiate the signal attenuation, whereas a higher dose would cause significant artifacts. This iron oxide-enhanced MRI technique can potentially be used to monitor cell migration and infiltration at the pathological site or to confirm any cellular response following some specific treatment strategies. Magn Reson Med, 2011. © 2011 Wiley Periodicals, Inc.

Get access to the full text of this article

Ancillary