Title
Patterns of brain glucose metabolism induced by phosphodiesterase 10A inhibitors in the mouse : a potential translational biomarker Patterns of brain glucose metabolism induced by phosphodiesterase 10A inhibitors in the mouse : a potential translational biomarker
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Publication type
article
Publication
Baltimore, Md ,
Subject
Pharmacology. Therapy
Source (journal)
The journal of pharmacology and experimental therapeutics. - Baltimore, Md
Volume/pages
339(2011) :1 , p. 210-217
ISSN
0022-3565
ISI
000294998900023
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Phosphodiesterase 10A (PDE10A) inhibitors have recently been proposed as a new therapy for schizophrenia. The aim of this study was to enhance our understanding of the role of PDE10A inhibitors and potentially identify a clinically useful mechanistic/functional biomarker by using 2-deoxyglucose (2-DG) autoradiography. PDE10A inhibitors papaverine (10 and 40 mg/kg), 6,7-dimethoxy-4-[(3R)-3-(2-quinoxalinyloxy)-1-pyrrolidinyl]quinazoline (PQ-10), (0.1610 mg/kg), and 2-[{4-(1-methyl-4-pyridin-4-yl-1H-pyrazol-3-yl)phenoxy}methyl]quinoline (MP-10) (0.1640 mg/kg) induced region-specific hypermetabolism in the globus pallidus and lateral habenula of C57BL/6 mice. Studies with MP-10 revealed a dose-dependent relative increase in globus pallidus activation, whereas a bell-shaped curve was observed for the lateral habenula. Although the relative increase in 2-DG uptake in the lateral habenula was also characteristic of the D2 antagonist haloperidol (0.010.63 mg/kg), relative 2-DG changes were absent in the globus pallidus. This observation probably is explained by the interaction of PDE10A inhibitors with the D1 direct pathway as suggested by experiments in combination with the D1 agonist (±)-6-chloro-7,8-dihydroxy-3-allyl-1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine hydrobromide (SKF-82958) (0.16 mg/kg). The absence of an effect of MP-10 (2.5 mg/kg) on relative glucose metabolism in the globus pallidus and lateral habenula of PDE10A knockout mice confirmed the specificity of the signal induced by PDE10A inhibitors. These studies substantiate the regulatory role of PDE10A in the basal ganglia circuit and as such support the potential of PDE10A inhibitors for treating psychiatric disorders. Moreover, we could differentiate PDE10A inhibitors from haloperidol based on specific patterns of hypermetabolism probably caused by its combined action at both direct and indirect dopaminergic pathways. Finally, these specific changes in brain glucose metabolism may act as a translational biomarker for target engagement in future clinical studies.
E-info
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