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EJNMMI Research
Published in: EJNMMI Research 1/2014

Open Access 01-12-2014 | Original research

Could 18 F-DPA-714 PET imaging be interesting to use in the early post-stroke period?

Authors: Maria-Joao Ribeiro, Johnny Vercouillie, Severine Debiais, Jean-Philippe Cottier, Isabelle Bonnaud, Vincent Camus, Samuel Banister, Michael Kassiou, Nicolas Arlicot, Denis Guilloteau

Published in: EJNMMI Research | Issue 1/2014

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Abstract

Background

Cerebral stroke is a severe and frequent condition that requires rapid and reliable diagnosis. If administered shortly after the first symptoms manifest themselves, IV thrombolysis has been shown to increase the functional prognosis by restoring brain reperfusion. However, a better understanding of the pathophysiology of stroke should help to identify potential new therapeutic targets. Stroke is known to induce an inflammatory brain reaction that involves overexpression of the 18-kDa translocator protein (TSPO) in glial cells and infiltrated leukocytes, which can be visualised by positron emission tomography (PET). We aimed to evaluate post-stroke neuroinflammation using the PET TSPO radioligand 18 F-DPA-714.

Methods

Nine patients underwent 18 F-DPA-714 PET and magnetic resonance imaging (MRI) between 8 and 18 days after the ictus. Co-registration of MRI and PET images was used to define three volumes of interest (VOIs): core infarction, contralateral region, and cerebellum ipsilateral to the stroke lesion. Time activity curves were obtained from each VOI, and ratios of mean and maximum activities between the VOIs were calculated.

Results

We observed an increased uptake of 18 F-DPA-714 co-localised with the infarct tissue and extension beyond the region corresponding to the damage in the blood brain barrier. No correlation was identified between 18 F-DPA-714 uptake and infarct volume. 18 F-DPA-714 uptake in ischemic lesion (mainly associated with TSPO expression in the infarct area and in the surrounding neighbourhood) slowly decreased from 10 min pi to the end of the PET acquisition, remaining higher than that in both contralateral region and ipsilateral cerebellum.

Conclusion

Our results show that 18 F-DPA-714 uptake after acute ischemia is mainly associated with TSPO expression in the infarct area and in the surrounding neighbourhood. We also demonstrated that the kinetics of 18 F-DPA-714 differs in injured tissue compared to normal tissue. Therefore, 18 F-DPA-714 may be useful in assessing the extent of neuroinflammation associated with acute stroke and could also help to predict clinical outcomes and functional recovery, as well as to assess therapeutic strategies, such as the use of neuroprotective/anti-inflammatory drugs.
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Metadata
Title
Could 18 F-DPA-714 PET imaging be interesting to use in the early post-stroke period?
Authors
Maria-Joao Ribeiro
Johnny Vercouillie
Severine Debiais
Jean-Philippe Cottier
Isabelle Bonnaud
Vincent Camus
Samuel Banister
Michael Kassiou
Nicolas Arlicot
Denis Guilloteau
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/s13550-014-0028-4

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