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- Title
Basolateral Amygdala Cdk5 Activity Mediates Consolidation and Reconsolidation of Memories for Cocaine Cues.
- Authors
Fang-qiong Li; Yan-xue Xue; Ji-shi Wang; Qin Fang; Yan-qin Li; Wei-Li Zhu; Ying-ying He; Jian-feng Liu; Li-fen Xue; Yavin Shaham; Lin Lu
- Abstract
Cocaine use and relapse involves learned associations between cocaine-associated environmental contexts and discrete stimuli and cocaine effects. Initially, these contextual and discrete cues undergo memory consolidation after being paired with cocaine exposure. During abstinence, cocaine cue memories can under go memory reconsolidation after cue exposure without the drug. We used a conditioned place preference (CPP) procedure in rats to study the role of neuronal protein kinase cyclin-dependent kinase 5 (Cdk5) in consolidation and reconsolidation of cocaine cue memories. We found that the expression of cocaine CPP in drug-free tests 1 d after CPP training (four pairings of 10 mg/kg cocaine with one context and four pairings of saline with a different context) increased Cdk5 activity, and levels of the Cdk5 activator p35 in basolateral but not central amygdala. We also found that basolateral (but not central) amygdala injections of the Cdk5 inhibitor β-butyrolactone (100 ng/side) immediately (but not 6 h) after cocaine-context pairings during training prevented subsequent cocaine CPP expression. After training, acute basolateral (but not central) amygdala β-butyrolactone injections immediately before testing prevented the expression of cocaine CPP; this effect was also observed on a second test performed 1 d later, suggesting an effect on reconsolidation of cocaine cue memories. In support, basolateral β-butyrolactone injections, given immediately (but not 6 h) after a single exposure to the cocaine-paired context, prevented cocaine CPP expression 1 and 14 d after the injections. Results indicate that basolateral amygdala Cdk5 activity is critical for consolidation and reconsolidation of the memories of cocaine-associated environmental cues.
- Subjects
AMYGDALOID body; COCAINE; PROTEIN kinases; MEMORY; BASAL ganglia
- Publication
Journal of Neuroscience, 2010, Vol 30, Issue 31, p10351
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.2112-10.2010