Abstract：
:Reward-related incentive learning involves the acquisition by neutral stimuli of an enhanced ability to elicit approach and other responses. Previous studies have shown that both dopamine (DA) and glutamate (Glu) play critical roles in this type of learning. Signaling molecules are intracellular messengers that participate in the influence of transmitter-receptor events on intracellular function including transcription in the nucleus. In recent years studies have begun to implicate signaling molecules in incentive learning. Thus, inhibition of cyclic adenosine monophosphate-dependent protein kinase (PKA) in the nucleus accumbens (NAc), that is activated by DA acting at D1-like receptors, blocks the acquisition of conditioned approach responses, lever pressing for food, conditioned place preference (CPP) based on NAc injections of amphetamine or cocaine, and conditioned activity based on NAc injections of amphetamine. Similar effects have been observed with PKA inhibition in the basolateral amygdala or medial prefrontal cortex. If animals were trained prior to testing with PKA inhibitors in NAc, no effect was seen suggesting that PKA is more important for acquisition than expression of incentive learning. Inhibition of calcium-dependent protein kinase or mitogen-activated protein kinases in NAc similarly has been shown to block the acquisition of incentive learning. Results support a model of DA-Glu synaptic interactions that form the basis of incentive learning.
journal_name
Neurotox Resjournal_title
Neurotoxicity researchauthors
Beninger RJ,Gerdjikov Tdoi
10.1007/BF03033301keywords:
subject
Has Abstractpub_date
2004-01-01 00:00:00pages
91-104issue
1eissn
1029-8428issn
1476-3524journal_volume
6pub_type
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