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Title: In vivo type 1 cannabinoid receptor mapping in the 6-hydroxydopamine lesion rat model of Parkinson's disease
Authors: Casteels, Cindy ×
Lauwers, Erwin
Baitar, Abdelbari
Bormans, Guy
Baekelandt, Veerle
Van Laere, Koen #
Issue Date: Feb-2010
Publisher: Elsevier/North Holland
Series Title: Brain Research vol:1316 pages:153-162
Abstract: Type 1 cannabinoid (CB1) receptors are expressed in high concentrations in the central nervous system, including the basal ganglia, and could have direct or indirect effects on motor behavior through modulation of dopaminergic, glutamatergic and GABA-ergic neurotransmission. Using the CB1 receptor radioligand [(18)F]MK-9470 and small-animal PET, we investigated for the first time in vivo cerebral changes in [(18)F]MK-9470 binding in the 6-hydroxydopamine (6-OHDA) rat model of Parkinson's disease (PD), parallel to dopamine transporter (DAT) imaging, tyrosine hydroxylase (TH) staining, and behavioral measurements. In the 6-OHDA model, relative [(18)F]MK-9470 PET binding decreased in the contralateral cerebellum (-9%, p<0.0004) and caudate-putamen bilaterally (ipsilateral -8%, contralateral -7%; p=0.001 and p<0.0003, respectively). The number of TH(+) neurons in the substantia nigra was inversely correlated to CB1 receptor binding in the ipsilateral cerebellum (p=1.10(-6)). The behavioral outcome was positively related to regional CB1 receptor binding in the contralateral somatosensory cortex (p=4.10(-6)). In vivo [(18)F]MK-9470 PET imaging points to changes in endocannabinoid transmission, specifically for CB1 receptors in the 6-OHDA model of PD, with mainly involvement of the caudate-putamen, but also distant regions of the motor circuitry, including the cerebellum and somatosensory cortex.
ISSN: 0006-8993
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Research Group for Neurobiology and Gene Therapy
Nuclear Medicine & Molecular Imaging
Animal Physiology and Neurobiology Section - miscellaneous
Radiopharmacy
× corresponding author
# (joint) last author

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