Stress augments the rewarding memory of cocaine via the activation of brainstem-reward circuitry.
Addict Biol
; 24(3): 509-521, 2019 05.
Article
em En
| MEDLINE
| ID: mdl-29480583
ABSTRACT
Effects of stress on the reward system are well established in the literature. Although previous studies have revealed that stress can reinstate extinguished addictive behaviors related to cocaine, the effects of stress on the rewarding memory of cocaine are not fully understood. Here, we provide evidence that stress potentiates the expression of rewarding memory of cocaine via the activation of brainstem-reward circuitry using a cocaine-induced conditioned place preference (CPP) paradigm combined with restraint stress in rats. The rats exposed to 30-minute restraint stress immediately before posttest exhibited significantly larger CPP scores compared with non-stressed rats. Intra-laterodorsal tegmental nucleus (LDT) microinjection of a ß or α2 adrenoceptor antagonist attenuated the stress-induced enhancement of cocaine CPP. Consistent with this observation, intra-LDT microinjection of a ß or α2 adrenoceptor agonist before posttest increased cocaine CPP. Additionally, intra-ventral tegmental area (VTA) microinjection of antagonists for the muscarinic acetylcholine, nicotinic acetylcholine or glutamate receptors attenuated the stress-induced enhancement of cocaine CPP. Finally, intra-medial prefrontal cortex (mPFC) microinjection of a D1 receptor antagonist also reduced the stress-induced enhancement of cocaine CPP. These findings suggest a mechanism wherein the LDT is activated by noradrenergic input from the locus coeruleus, leading to the activation of VTA dopamine neurons via both cholinergic and glutamatergic transmission and the subsequent excitation of the mPFC to enhance the memory of cocaine-induced reward value.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Recompensa
/
Cocaína
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Inibidores da Captação de Dopamina
/
Memória
Limite:
Animals
Idioma:
En
Revista:
Addict Biol
Assunto da revista:
TRANSTORNOS RELACIONADOS COM SUBSTANCIAS
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Japão