Abstract
Rationale
Alcohol use disorders have become one of the most damaging psychiatric disorders in the world; however, there are no ideal treatments in clinic. Phosphodiesterase-4 (PDE4), an enzyme that specifically hydrolyzes intracellular cyclic AMP (cAMP), has been involved in alcohol use disorders. Roflumilast is the first PDE4 inhibitor approved for treatment of chronic obstructive pulmonary diseases in clinic. It was of particular interest to researchers to determine whether roflumilast altered ethanol consumption.
Objectives
The present study tried to determine the effects of roflumilast on ethanol intake and preference.
Methods
We used the two-bottle choice paradigm to assess ethanol intake and preference in C57BL/6J mice treated with roflumilast (1, 3, or 10 mg/kg) or rolipram (0.5 mg/kg; positive control). The effect of roflumilast was verified using the ethanol drinking-in-dark (DID) test. Locomotor activity was examined using the open-field test. Intake of sucrose or quinine was also tested to determine whether natural reward preference and aversive stimuli were involved in the effect of PDE4 inhibitors.
Results
Similar to rolipram, roflumilast decreased ethanol intake and preference in two-bottle choice and DID tests in a dose-dependent manner, with significant changes at the dose of 10 mg/kg; in contrast, roflumilast did not affect sucrose or quinine drinking, although it decreased locomotor activity at the high dose within 3 h of treatment.
Conclusions
These data provide novel demonstration for the effect of roflumilast on ethanol consumption and suggest that roflumilast may be beneficial for treatment of alcoholism.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 81471212, 81271275, 81070947, and 30770759 to B.-L. Sun), the Natural Scientific Foundation of Shandong Province (No. ZR2014CL011 to X. Liu, No. ZR2012HZ006 to B.-L. Sun), the High-Level Project Cultivating Grants of Taishan Medical University (No. 2013GCC08 to X. Liu), the High-School Scientific Research Development Program of Shandong Province (No. 2016J16LL57 to X. Liu), the research grants from the Foundation of Taishan Scholars of Shandong Province, China (to B.-L. Sun), and the research grants from the Foundation of Overseas Distinguished Taishan Scholars of Shandong Province, China (to H.-T. Zhang).
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Liu, X., Hao, PD., Yang, MF. et al. The phosphodiesterase-4 inhibitor roflumilast decreases ethanol consumption in C57BL/6J mice. Psychopharmacology 234, 2409–2419 (2017). https://doi.org/10.1007/s00213-017-4631-8
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DOI: https://doi.org/10.1007/s00213-017-4631-8