Abstract
Purpose
Phosphodiesterase 10A (PDE10A) is a dual substrate enzyme highly enriched in dopamine-receptive striatal medium spiny neurons, which are involved in psychiatric disorders such as alcohol use disorders (AUD). Although preclinical studies suggest a correlation of PDE10A mRNA expression in neuronal and behavioral responses to alcohol intake, little is known about the effects of alcohol exposure on in vivo PDE10A activity in relation to apparent risk factors for AUD such as decision-making and anxiety.
Methods
We performed a longitudinal [18F]JNJ42259152 microPET study to evaluate PDE10A changes over a 9-week intermittent access to alcohol model, including 6 weeks of alcohol exposure, 2 weeks of abstinence followed by 1 week relapse. Parametric PDE10A-binding potential (BPND) images were generated using a Logan reference tissue model with cerebellum as reference region and were analyzed using both a volume-of-interest and voxel-based approach. Moreover, individual decision-making and anxiety levels were assessed with the rat Iowa Gambling Task and open-field test over the IAE model.
Results
We observed an increased alcohol preference especially in those animals that exhibited poor initial decision-making. The first 2 weeks of alcohol exposure resulted in an increased striatal PDE10A binding (> 10%). Comparing PDE10A-binding potential after 2 versus 4 weeks of exposure showed a significant decreased PDE10A in the caudate-putamen and nucleus accumbens (pFWE-corrected < 0.05). This striatal PDE10A decrease was related to alcohol consumption and preference. Normalization of striatal PDE10A to initial levels was observed after 1 week of relapse, apart from the globus pallidus.
Conclusion
This study shows that chronic voluntary alcohol consumption induces a reversible increased PDE10A enzymatic availability in the striatum, which is related to the amount of alcohol preference. Thus, PDE10A-mediated signaling plays an important role in modulating the reinforcing effects of alcohol, and the data suggest that PDE10A inhibition may have beneficial behavioral effects on alcohol intake.
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Change history
14 May 2022
A Correction to this paper has been published: https://doi.org/10.1007/s00259-022-05802-z
Abbreviations
- AUD:
-
Alcohol use disorders
- BP:
-
Binding potential
- cAMP:
-
Cyclic adenosine monophosphate
- cGMP:
-
Cyclic guanosine monophosphate
- D1:
-
Dopamine receptor type 1
- D2:
-
Dopamine receptor type 2
- IAE:
-
Intermittent access to ethanol
- MSNs:
-
Medium spiny neurons
- NuAc:
-
Nucleus accumbens
- OFT:
-
Open-field test
- PDE:
-
Phosphodiesterase
- PDE10A:
-
Phosphodiesterase 10A
- rIGT:
-
Rat Iowa Gambling Task
- VOI:
-
Volumes of interest
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Acknowledgements
The authors would like to thank Tinne Buelens and Ann Van Santvoort for their excellent technical assistance and the local radiopharmacy team for the tracer productions.
Funding
This work was funded by a research grant to JC from the Research Foundation Flanders (FWO/1508415 N). JC is a postdoctoral fellow from FWO (FWO/12R1619N). YEK is a SB PhD fellow at FWO (FWO/1S50320N), BdL received a PhD fellowship from the Flemish Agency for Innovation by Science and Technology, and KVL is senior clinical research fellow for the FWO. GS, MO, JMH, and GB have no competing financial interests to report in relation to this work.
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The experimental setup was designed by BdL and JC. BdL, GS and MO performed data collection. Data analysis was conducted by YEK and JC. The manuscript was written by YEK and JC, supported by BdL, GS, MO, JMH, GB and KVL. All authors revised the manuscript and accepted the final version.
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All animal experiments were conducted according to the European Communities Council Directive of November 24, 1986 (86/609/EEC) and approved by the Animal Ethics Committees of the University of Leuven.
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de Laat, B., Kling, Y.E., Schroyen, G. et al. Effects of chronic voluntary alcohol consumption on PDE10A availability: a longitudinal behavioral and [18F]JNJ42259152 PET study in rats. Eur J Nucl Med Mol Imaging 49, 492–502 (2022). https://doi.org/10.1007/s00259-021-05448-3
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DOI: https://doi.org/10.1007/s00259-021-05448-3