Imaging disease activity of rheumatoid arthritis by macrophage targeting using second generation translocator protein positron emission tomography tracers

Autoři: S. T. G. Bruijnen aff001;  N. J. F. Verweij aff001;  Y. Y. J. Gent aff001;  M. C. Huisman aff002;  A. D. Windhorst aff002;  M. Kassiou aff003;  P. M. van de Ven aff004;  A. A. Lammertsma aff002;  O. S. Hoekstra aff002;  A. E. Voskuyl aff001;  C. J. van der Laken aff001
Působiště autorů: Amsterdam Rheumatology and Immunology Center (ARC), Amsterdam UMC| location VUmc, Amsterdam, the Netherlands aff001;  Department of Radiology & Nuclear Medicine, Amsterdam UMC| location VUmc, Amsterdam, The Netherlands aff002;  School of Chemistry, The University of Sydney, Sydney, Australia aff003;  Department of Epidemiology and Biostatistics, Amsterdam UMC| location VUmc, Amsterdam, The Netherlands aff004
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: 10.1371/journal.pone.0222844



Positron emission tomography (PET) imaging of macrophages using the translocator protein (TSPO) tracer (R)-[11C]PK11195 has shown the promise to image rheumatoid arthritis (RA). To further improve TSPO PET for RA imaging, second generation TSPO tracers [11C]DPA-713 and [18F]DPA-714 have recently been evaluated pre-clinically showing better imaging characteristics.


A clinical proof of concept study to evaluate [11C]DPA-713 and [18F]DPA-714 to visualize arthritis in RA patients.


RA patients (n = 13) with at least two active hand joints were included. PET/CT scans of the hands were obtained after injection of [18F]DPA-714, [11C]DPA-713 and/or (R)-[11C]PK11195 (max. 2 tracers pp). Standardized uptake values (SUVs) and target-to-background (T/B) ratios were determined. Imaging data of the 3 different tracers were compared by pooled post-hoc testing, and by a head to head comparison.


Clinically active arthritis was present in 110 hand joints (2–17 pp). Arthritic joints were visualized with both [11C]DPA-713 and [18F]DPA-714. Visual tracer uptake corresponded with clinical signs of arthritis in 80% of the joints. Mean absolute uptake in PET-positive joints was significantly higher for [11C]DPA-713 than for [18F]DPA-714, the latter being not significantly different from (R)-[11C]PK11195 uptake. Background uptake was lower for both DPA tracers compared with that of (R)-[11C]PK11195. Higher absolute uptake and lower background resulted in two-fold higher T/B ratios for [11C]DPA-713.


[11C]DPA-713 and [18F]DPA-714 visualize arthritic joints in active RA patients and most optimal arthritis imaging results were obtained for [11C]DPA-713. Second generation TSPO macrophage PET provides new opportunities for both early diagnosis and therapy monitoring of RA.

Klíčová slova:

Arthritis – Blood – Macrophages – NSAIDs – Positron emission tomography – Rheumatoid arthritis – Skeletal joints


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