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European Journal of Nuclear Medicine and Molecular Imaging
Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging 6/2016

10.12.2015 | Original Article

In vivo imaging of system xc- as a novel approach to monitor multiple sclerosis

verfasst von: Abraham Martín, Nuria Vázquez-Villoldo, Vanessa Gómez-Vallejo, Daniel Padro, Federico N. Soria, Boguslaw Szczupak, Sandra Plaza-García, Ander Arrieta, Torsten Reese, Jordi Llop, Maria Domercq, Carlos Matute

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 6/2016

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Abstract

Purpose

Glutamate excitotoxicity contributes to oligodendroglial and axonal damage in multiple sclerosis pathology. Extracellular glutamate concentration in the brain is controlled by cystine/glutamate antiporter (system xc-), a membrane antiporter that imports cystine and releases glutamate. Despite this, the system xc− activity and its connection to the inflammatory reaction in multiple sclerosis (MS) is largely unknown.

Methods

Longitudinal in vivo magnetic resonance (MRI) and positron emission tomography (PET) imaging studies with 2-[18F]Fluoro-2-deoxy-D-glucose ([18F]FDG), [11C]-(R)-(1-(2-chlorophenyl)-N-methyl-N-1(1-methylpropyl)-3-isoquinolinecarboxamide ([11C]PK11195) and (4S)-4-(3-18F-fluoropropyl)-L-glutamate ([18F]FSPG) were carried out during the course of experimental autoimmune encephalomyelitis (EAE) induction in rats.

Results

[18F]FSPG showed a significant increase of system xc− function in the lumbar section of the spinal cord at 14 days post immunization (dpi) that stands in agreement with the neurological symptoms and ventricle edema formation at this time point. Likewise, [18F]FDG did not show significant changes in glucose metabolism throughout central nervous system and [11C]PK11195 evidenced a significant increase of microglial/macrophage activation in spinal cord and cerebellum 2 weeks after EAE induction. Therefore, [18F]FSPG showed a major capacity to discriminate regions of the central nervous system affected by the MS in comparison to [18F]FDG and [11C]PK11195. Additionally, clodronate-treated rats showed a depletion in microglial population and [18F]FSPG PET signal in spinal cord confirming a link between neuroinflammatory reaction and cystine/glutamate antiporter activity in EAE rats.

Conclusions

Altogether, these results suggest that in vivo PET imaging of system xc− could become a valuable tool for the diagnosis and treatment evaluation of MS.
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Metadaten
Titel
In vivo imaging of system xc- as a novel approach to monitor multiple sclerosis
verfasst von
Abraham Martín
Nuria Vázquez-Villoldo
Vanessa Gómez-Vallejo
Daniel Padro
Federico N. Soria
Boguslaw Szczupak
Sandra Plaza-García
Ander Arrieta
Torsten Reese
Jordi Llop
Maria Domercq
Carlos Matute
Publikationsdatum
10.12.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 6/2016
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-015-3275-3

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