Evaluation of CLINDE as potent translocator protein (18 kDa) SPECT radiotracer reflecting the degree of neuroinflammation in a rat model of microglial activation

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dc.contributor.authorArlicot, Nen_AU
dc.contributor.authorKatsifis, Aen_AU
dc.contributor.authorGarreau, Len_AU
dc.contributor.authorMattner, Fen_AU
dc.contributor.authorVergote, Jen_AU
dc.contributor.authorDuval, Sen_AU
dc.contributor.authorBodard, Sen_AU
dc.contributor.authorGuilloteau, Den_AU
dc.contributor.authorChalon, Sen_AU
dc.date.accessioned2020-02-13T05:44:28Zen_AU
dc.date.available2020-02-13T05:44:28Zen_AU
dc.date.issued2008-06-07en_AU
dc.date.statistics2019-11-21en_AU
dc.description.abstractThe translocator protein (TSPO; 18 kDa), the new name of the peripheral-type benzodiazepine receptor, is localised in mitochondria of glial cells and expressed in very low concentrations in normal brain. Their expression rises after microglial activation following brain injury. Accordingly, TSPO are potential targets to evaluate neuroinflammatory changes in a variety of CNS disorders. To date, only a few effective tools are available to explore TSPO by SPECT. We characterised here 6-chloro-2-(4'iodophenyl)-3-(N,N-diethyl) -imidazo[1,2-a]pyridine-3-acetamide or CLINDE in a rat model with different stages of excitotoxic lesion. Excitotoxicity was induced in male Wistar rats by unilateral intrastriatal injection of different amounts of quinolinic acid (75, 150 or 300 nmol). Six days later, two groups of rats (n = 5-6/group) were i.v. injected with [125I]-CLINDE (0.4 MBq); one group being pre-injected with PK11195 (5 mg/kg). Brains were removed 30 min after tracer injection and the radioactivity of cerebral areas measured. Complementary ex vivo autoradiography, in vitro autoradiography ([3H]-PK11195) and immunohistochemical studies (OX-42) were performed on brain sections. In the control group, [125I]-CLINDE binding was significantly higher (p < 0.001) in lesioned than that in intact side. This binding disappeared in rats pre-treated with PK11195 (p<0.001), showing specific binding of CLINDE to TSPO. Ex vivo and in vitro autoradiographic studies and immunohistochemistry were consistent with this, revealing a spatial correspondence between radioactivity signal and activated microglia. Regression analysis yielded a positive relation between the ligand binding and the degree of neuroinflammation. These results demonstrate that CLINDE is suitable for TSPO in vivo SPECT imaging to explore their involvement in neurodegenerative disorders associated with microglial activation. © 2008 Springer International Publishingen_AU
dc.identifier.citationArlicot, N., Katsifis, A., Garreau, L., Mattner, F., Vergote, J., Duval, S., Bodard, S., Guilloteau, D., & Chalon, D. (2008). Evaluation of CLINDE as potent translocator protein (18 kDa) SPECT radiotracer reflecting the degree of neuroinflammation in a rat model of microglial activation. European Journal of Nuclear Medicine and Molecular Imaging 35(12), 2203-2211. doi:10.1007/s00259-008-0834-xen_AU
dc.identifier.govdoc8665en_AU
dc.identifier.issn1619-7070en_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleEuropean Journal of Nuclear Medicine and Molecular Imagingen_AU
dc.identifier.pagination2203-2211en_AU
dc.identifier.urihttp://dx.doi.org/10.1007/s00259-008-0834-xen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9108en_AU
dc.identifier.volume35en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectInflammationen_AU
dc.subjectRatsen_AU
dc.subjectProteinsen_AU
dc.subjectMitochondriaen_AU
dc.subjectBrainen_AU
dc.subjectAutoradiographyen_AU
dc.titleEvaluation of CLINDE as potent translocator protein (18 kDa) SPECT radiotracer reflecting the degree of neuroinflammation in a rat model of microglial activationen_AU
dc.typeJournal Articleen_AU
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