Abstract:
:Exposure to drug-associated cues evokes drug-seeking behavior and is regarded as a major cause of relapse. Conditional stimulus upregulates noradrenaline (NA) system activity, but the drug-seeking behavior depends particularly on phasic dopamine signaling downstream from the ventral tegmental area (VTA). The VTA dopamine-ergic activity is regulated via the signaling of alpha1 -adrenergic and alpha2 -adrenergic receptors (α1 -ARs and α2 -ARs); thus, the impact of the conditional stimulus on drug-seeking behavior might involve NAergic signaling in the VTA. To date, the role of VTA ARs in regulating cocaine seeking was not studied. We found that cocaine seeking under extinction conditions in male Sprague-Dawley rats was attenuated by intra-VTA prazosin or terazosin-two selective α1 -AR antagonists. In contrast, cocaine seeking was facilitated by intra-VTA administration of the selective α1 -AR agonist phenylephrine as well as α2 -AR antagonist RX 821002, whereas the selective β-AR antagonist propranolol had no effects. In addition, blockade of α1 -AR in the VTA prevented α2 -AR antagonist-induced enhancement of cocaine seeking. Importantly, the potential non-specific effects of the VTA AR blockade on cocaine seeking could be excluded, because none of the AR antagonists influenced sucrose seeking under extinction conditions or locomotor activity in the open field test. These results demonstrate that NAergic signaling potently and selectively regulates cocaine seeking during early cocaine withdrawal via VTA α1 -AR and α2 -AR but not β-AR. Our findings provide new insight into the NAergic mechanisms that underlie cocaine craving.
journal_name
Addict Bioljournal_title
Addiction biologyauthors
Solecki WB,Szklarczyk K,Pradel K,Kwiatkowska K,Dobrzański G,Przewłocki Rdoi
10.1111/adb.12514subject
Has Abstractpub_date
2018-03-01 00:00:00pages
596-609issue
2eissn
1355-6215issn
1369-1600journal_volume
23pub_type
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