Zhang X, Liu X, Wang D, Liu H, Hao W. Conditioned place preference associated with level of palmitoylation of PSD-95 in rat hippocampus and nucleus accumbens.
Neuropsychobiology 2012;
64:211-8. [PMID:
21912189 DOI:
10.1159/000327603]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Accepted: 03/14/2011] [Indexed: 11/19/2022]
Abstract
Psychostimulant-mediated synaptic plasticity in the hippocampus and nucleus accumbens is one of the pathological features of addiction, a disease of learning and memory. Dynamic palmitoylation of PSD-95 modulates synaptic plasticity, but its role in addiction is not fully understood. Using a morphine-conditioned place preference (CPP) rat model and Acyl-biotin exchange (ABE) labeling we found a correlation between CPP and levels of palmitoylated PSD-95 in the hippocampus and nucleus accumbens. Rats that developed significant CPP had higher levels of palmitoylation of PSD-95 in the hippocampus and nucleus accumbens. Furthermore, palmitoylation of PSD-95 was significantly decreased in the hippocampus but increased in the nucleus accumbens during the beginning of withdrawal. With long-term withdrawal, palmitoylated PSD-95 in these regions recovered, while CPP waned and physical signs gradually disappeared. However, morphine reinjection restored strong CPP without producing any significant changes in palmitoylation of PSD-95. Our findings suggest that CPP is correlated with the dynamics of PSD-95 palmitoylation in rat hippocampus and nucleus accumbens, and could be one of the mechanisms for morphine-dependent synaptic plasticity.
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