Abstract:
:Adenosine A2A receptors (A2AR) are a sub-type of receptors enriched in basal ganglia, activated by the neuromodulator adenosine, which interact with dopamine D2 receptors. Although this reciprocal antagonistic interaction is well-established in motor function, the outcome in dopamine-related behaviors remains uncertain, in particular in depression and anxiety. We have demonstrated an upsurge of A2AR associated to aging and chronic stress. Furthermore, Alzheimer's disease patients present A2AR accumulation in cortical areas together with depressive signs. We now tested the impact of overexpressing A2AR in forebrain neurons on dopamine-related behavior, namely depression. Adult male rats overexpressing human A2AR under the control of CaMKII promoter [Tg(CaMKII-hA2AR)] and aged-matched wild-types (WT) of the same strain (Sprague-Dawley) were studied. The forced swimming test (FST), sucrose preference test (SPT), and the open-field test (OFT) were performed to evaluate behavioral despair, anhedonia, locomotion, and anxiety. Tg(CaMKII-hA2AR) animals spent more time floating and less time swimming in the FST and presented a decreased sucrose preference at 48 h in the SPT. They also covered higher distances in the OFT and spent more time in the central zone than the WT. The results indicate that Tg(CaMKII-hA2AR) rats exhibit depressive-like behavior, hyperlocomotion, and altered exploratory behavior. This A2AR overexpression may explain the depressive signs found in aging, chronic stress, and Alzheimer's disease.
journal_name
Front Psychiatryjournal_title
Frontiers in psychiatryauthors
Coelho JE,Alves P,Canas PM,Valadas JS,Shmidt T,Batalha VL,Ferreira DG,Ribeiro JA,Bader M,Cunha RA,do Couto FS,Lopes LVdoi
10.3389/fpsyt.2014.00067subject
Has Abstractpub_date
2014-06-13 00:00:00pages
67issn
1664-0640journal_volume
5pub_type
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doi:10.3389/fpsyt.2018.00048
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journal_title:Frontiers in psychiatry
pub_type: 杂志文章
doi:10.3389/fpsyt.2018.00114
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journal_title:Frontiers in psychiatry
pub_type: 杂志文章
doi:10.3389/fpsyt.2016.00034
更新日期:2016-03-10 00:00:00
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