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EJNMMI Research
Published in: EJNMMI Research 1/2014

Open Access 01-12-2014 | Original research

68Ga-DOTA-Siglec-9 PET/CT imaging of peri-implant tissue responses and staphylococcal infections

Authors: Helena Ahtinen, Julia Kulkova, Laura Lindholm, Erkki Eerola, Antti J Hakanen, Niko Moritz, Mirva Söderström, Tiina Saanijoki, Sirpa Jalkanen, Anne Roivainen, Hannu T Aro

Published in: EJNMMI Research | Issue 1/2014

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Abstract

Background

Staphylococcus epidermidis (S. epidermidis) has emerged as one of the leading pathogens of biomaterial-related infections. Vascular adhesion protein-1 (VAP-1) is an inflammation-inducible endothelial molecule controlling extravasation of leukocytes. Sialic acid-binding immunoglobulin-like lectin 9 (Siglec-9) is a leukocyte ligand of VAP-1. We hypothesized that 68Ga-labeled 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid-conjugated Siglec-9 motif containing peptide (68Ga-DOTA-Siglec-9) could detect inflammatory response due to S. epidermidis peri-implant infection by positron emission tomography (PET).

Methods

Thirty Sprague-Dawley rats were randomized into three groups. A sterile catheter was implanted into the medullary canal of the left tibia. In groups 1 and 2, the implantation was followed by peri-implant injection of S. epidermidis or Staphylococcus aureus (S. aureus) with adjunct injections of aqueous sodium morrhuate. In group 3, sterile saline was injected instead of bacteria and no aqueous sodium morrhuate was used. At 2 weeks after operation, 68Ga-DOTA-Siglec-9 PET coupled with computed tomography (CT) was performed with the measurement of the standardized uptake value (SUV). The presence of the implant-related infection was verified by microbiological analysis, imaging with fluorescence microscope, and histology. The in vivo PET results were verified by ex vivo measurements by gamma counter.

Results

In group 3, the tibias with implanted sterile catheters showed an increased local uptake of 68Ga-DOTA-Siglec-9 compared with the intact contralateral bones (SUVratio +29.5%). 68Ga-DOTA-Siglec-9 PET detected inflammation induced by S. epidermidis and S. aureus catheter-related bone infections (SUVratio +58.1% and +41.7%, respectively). The tracer uptake was significantly higher in the S. epidermidis group than in group 3 without bacterial inoculation, but the difference between S. epidermidis and S. aureus groups was not statistically significant. The difference between the S. aureus group and group 3 was neither statistically significant.

Conclusion

PET/CT imaging with novel 68Ga-DOTA-Siglec-9 tracer was able to detect inflammatory tissue response induced by catheter implantation and staphylococcal infections.
Appendix
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Metadata
Title
68Ga-DOTA-Siglec-9 PET/CT imaging of peri-implant tissue responses and staphylococcal infections
Authors
Helena Ahtinen
Julia Kulkova
Laura Lindholm
Erkki Eerola
Antti J Hakanen
Niko Moritz
Mirva Söderström
Tiina Saanijoki
Sirpa Jalkanen
Anne Roivainen
Hannu T Aro
Publication date
01-12-2014
Publisher
Springer Berlin Heidelberg
Published in
EJNMMI Research / Issue 1/2014
Electronic ISSN: 2191-219X
DOI
https://doi.org/10.1186/s13550-014-0045-3

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