In vivo PET Imaging of Gliogenesis After Cerebral Ischemia in Rats

In vivopositron emission tomography of neuroinflammation has mainly focused on the evaluation of glial cell activation using radiolabeled ligands. However, the non-invasive imaging of neuroinflammatory cell proliferation has been scarcely evaluated so far.In vivoandex vivoassessment of gliogenesis a...

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Bibliographic Details
Authors: Ardaya Franco, María Isabel, Joya, Ana, Padró, Daniel, Plaza García, Sandra, Gómez Vallejo, Vanessa, Sánchez, Mercedes, Garbizu, Maider, Cossío Arrieta, Unai, Matute Almau, Carlos José, Cavaliere, Fabio, Llop Roig, Jordi, Martín Muñoz, Abraham
Format: article
Publication Date:2020
Country:España
Institution:Universidad del País Vasco
Repository:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/49817
Online Access:http://hdl.handle.net/10810/49817
Access Level:Open access
Keyword:cerebral ischemia
PET
[F-18]FLT
gliogenesis
glia
cell-proliferation
brain inflammation
receptor
mechanisms
oncology
Description
Summary:In vivopositron emission tomography of neuroinflammation has mainly focused on the evaluation of glial cell activation using radiolabeled ligands. However, the non-invasive imaging of neuroinflammatory cell proliferation has been scarcely evaluated so far.In vivoandex vivoassessment of gliogenesis after transient middle cerebral artery occlusion (MCAO) in rats was carried out using PET imaging with the marker of cell proliferation 3 '-Deoxy-3 '-[18F] fluorothymidine ([F-18]FLT), magnetic resonance imaging (MRI) and fluorescence immunohistochemistry. MRI-T2W studies showed the presence of the brain infarction at 24 h after MCAO affecting cerebral cortex and striatum.In vivoPET imaging showed a significant increase in [F-18]FLT uptake in the ischemic territory at day 7 followed by a progressive decline from day 14 to day 28 after ischemia onset. In addition, immunohistochemistry studies using Ki67, CD11b, and GFAP to evaluate proliferation of microglia and astrocytes confirmed the PET findings showing the increase of glial proliferation at day 7 after ischemia followed by decrease later on. Hence, these results show that [F-18]FLT provides accurate quantitative information on the time course of glial proliferation in experimental stroke. Finally, this novel brain imaging method might guide on the imaging evaluation of the role of gliogenesis after stroke.

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