Abstract
Purpose
The purpose of this study was to assess the feasibility of inflammation detection in an antigen-induced arthritis model using fluorescent leukocytes and optical imaging.
Methods
Antigen-mediated monoarthritis was induced in the right knee of 12 Sprague-Dawley rats. Six rats remained untreated and six rats were treated with cortisone. All rats received ex vivo fluorescent-labeled rat leukocytes. Optical images of both knees were acquired before and at 5 min, 1 h, 4 h, and 24 h after cell injection. Images were evaluated qualitatively and quantitatively by calculating signal intensity ratios between the right arthritic (A) and contralateral normal (N) knee. A/N ratios were tested for significant differences between baseline values and values after cell injection using a paired t test as well as between the untreated and cortisone-treated group using an unpaired t test. Synovial specimens were processed and evaluated for labeled cells with fluorescence microscopy.
Results
At 4 h and 24 h p.i., the A/N ratios of untreated arthritic knees showed a significant signal increase compared with baseline values (p<0.05) and a significant difference compared with A/N ratios of cortisone-treated animals (p<0.05). Fluorescent microscopy confirmed the presence of labeled cells in the arthritic synovium.
Conclusion
Inflammation in antigen-induced arthritis can be detected with ex vivo labeled allogenic leukocytes and optical imaging.
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Acknowledgements
This work was supported by a Research and Education Foundation Grant from the Society of Pediatric Radiology and by a seed grant from the Department of Radiology, UCSF.
The authors would like to thank Peter Lange, MD, MRCP (UK) for his critical revision of the manuscript.
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Simon, G.H., Daldrup-Link, H.E., Kau, J. et al. Optical imaging of experimental arthritis using allogeneic leukocytes labeled with a near-infrared fluorescent probe. Eur J Nucl Med Mol Imaging 33, 998–1006 (2006). https://doi.org/10.1007/s00259-006-0081-y
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DOI: https://doi.org/10.1007/s00259-006-0081-y