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2014 ; 39
(10
): 2432-40
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Adenosinergic regulation of striatal clock gene expression and ethanol intake
during constant light
#MMPMID24755889
Ruby CL
; Vadnie CA
; Hinton DJ
; Abulseoud OA
; Walker DL
; O'Connor KM
; Noterman MF
; Choi DS
Neuropsychopharmacology
2014[Sep]; 39
(10
): 2432-40
PMID24755889
show ga
Circadian rhythm and sleep disruptions occur frequently in individuals with
alcohol use disorders (AUD) and present significant barriers to treatment.
Recently, a variant of adenosine transporter, equilibrative nucleoside
transporter 1 (ENT1), was associated with the co-occurrence of sleep problems and
AUD. We have previously shown that mice lacking ENT1 (ENT1 KO) have reduced
adenosine levels in the striatum and drink more alcohol compared with wild types
(WT). However, it is unknown whether ENT1 deletion disrupts circadian rhythms,
which may contribute to alcohol preference in ENT1 KO mice. Here we used these
mice to determine whether endogenous adenosine regulates circadian genetic and
behavioral rhythms and influences alcohol intake during chronodisruption. We
examined circadian locomotor activity in ENT1 KO vs WT littermates and found that
ENT1 KO mice were both active earlier and hyperactive compared with WT mice at
night. We used real-time PCR and immunohistochemistry to estimate striatal clock
gene levels and found that PER2 expression in the striatum was blunted by ENT1
deletion or A2A receptor (A2AR) antagonism. Next, we exposed ENT1 KO and WT mice
to constant light (LL) and found further elevation in ethanol intake in ENT1 KO,
but not in WT mice, supporting the notion that circadian dysfunction may
contribute to increased alcohol intake in ENT1 KO mice. Finally, we showed that
A2AR agonist administration normalized PER1 and PER2 expression and circadian
locomotor activity in ENT1 KO mice. Together, our results demonstrate that
adenosine signaling regulates cellular and behavioral circadian timing and
influences alcohol intake during chronodisruption.