Optical imaging of experimental arthritis using allogeneic leukocytes labeled with a near-infrared fluorescent probe

Gerhard H. Simon, Heike E. Daldrup-Link, Juli Kau, Stephan Metz, Juergen Schlegel, Guido Piontek, Olaf Saborowski, Stavros Demos, Justus Duyster, Bernd J. Pichler

Research output: Contribution to journalArticle

31 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)998-1006
Number of pages9
JournalEuropean Journal of Nuclear Medicine and Molecular Imaging
Volume33
Issue number9
DOIs
StatePublished - Sep 2006
Externally publishedYes

Keywords

  • Arthritis
  • Cell tracking
  • Fluorescence
  • In vivo
  • Optical imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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    Simon, G. H., Daldrup-Link, H. E., Kau, J., Metz, S., Schlegel, J., Piontek, G., Saborowski, O., Demos, S., Duyster, J., & Pichler, B. J. (2006). Optical imaging of experimental arthritis using allogeneic leukocytes labeled with a near-infrared fluorescent probe. European Journal of Nuclear Medicine and Molecular Imaging, 33(9), 998-1006. https://doi.org/10.1007/s00259-006-0081-y