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Published in: Molecular Imaging and Biology 3/2018

01-06-2018 | Research Article

A Non-Peptidic S100A9 Specific Ligand for Optical Imaging of Phagocyte Activity In Vivo

Authors: Tom Völler, Andreas Faust, Johannes Roth, Michael Schäfers, Thomas Vogl, Sven Hermann

Published in: Molecular Imaging and Biology | Issue 3/2018

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Abstract

Purpose

Non-invasive assessment of inflammatory activity in the course of various diseases is a largely unmet clinical challenge. An early feature of inflammation is local secretion of the alarmin S100A8/A9 by activated phagocytes. We here evaluate a novel S100A9-targeted small molecule tracer Cy5.5-CES271 for in vivo optical imaging of inflammatory activity in exemplary disease models.

Procedures

Dynamics of Cy5.5-CES271 was characterized in a model of irritant contact dermatitis by sequential fluorescence reflectance imaging (FRI) up to 24 h postinjection (p.i.). Specificity of Cy5.5-CES271 binding to S100A9 in vivo was examined by blocking studies and by employing S100A9−/− mice. Finally, S100A9 secretion in acute lung inflammation was assessed by Cy5.5-CES271 and FRI of explanted lungs.

Results

In ear inflammation, we were able to non-invasively follow the time course of S100A9 expression using Cy5.5-CES271 and FRI over 24 h p.i. (peak activity at 3 h p.i.). Specificity of imaging could be shown by a significant signal reduction after predosing and using S100A9−/− mice. In acute lung injury, local and systemic S100A8/A9 levels increased over time and correlated significantly with FRI signal levels in explanted lungs.

Conclusions

Cy5.5-CES271 shows significant accumulation in models of inflammatory diseases and specific binding to S100A9 in vivo. This study, for the first time, demonstrates the potential of a small molecule non-peptidic tracer enabling imaging of S100A9 as a marker of local phagocyte activity in inflammatory scenarios suggesting this compound class for translational attempts.
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Metadata
Title
A Non-Peptidic S100A9 Specific Ligand for Optical Imaging of Phagocyte Activity In Vivo
Authors
Tom Völler
Andreas Faust
Johannes Roth
Michael Schäfers
Thomas Vogl
Sven Hermann
Publication date
01-06-2018
Publisher
Springer International Publishing
Published in
Molecular Imaging and Biology / Issue 3/2018
Print ISSN: 1536-1632
Electronic ISSN: 1860-2002
DOI
https://doi.org/10.1007/s11307-017-1148-9

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