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The dopamine (DA) system of the ventral midbrain plays a critical role as mammals learn adaptive behaviors driven by environmental salience and reward. Addictive drugs, including nicotine, exert powerful influences over the mesolimbic DA system by activating and desensitizing nicotinic acetylcholine receptors (nAChRs) in a subtype-dependent manner. Nicotine induces synaptic plasticity at excitatory...
The medium spiny neurons (MSNs) of the nucleus accumbens function in a critical regard to examine and integrate information in the processing of rewarding behaviors. These neurons are aberrantly affected by drugs of abuse, including alcohol. However, ethanol is unlike any other common drug of abuse, due to its pleiotropic actions on intracellular and intercellular signaling processes. Intracellular...
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