Chronic nicotine-induced improvement of spatial working memory and D2 dopamine effects in rats
Nicotine improves working memory function in a variety of different testing situations. In a series of studies, we have found that chronic nicotine infusion improves working memory performance of rats in the win-shift version of the radial-arm maze. In the current studies, we examined the interaction of chronic nicotine effects in the radial-arm maze with dopamine D2 agonist and antagonist drugs, since we have previously found significant interactions of acute nicotinic agonist and antagonist effects with D2 systems. Replicating our earlier results, significant nicotine-induced improvements in working memory performance were seen. Chronic co-infusion of raclopride, a D2 antagonist, or quinpirole, D2/D3 agonist, were not found to significantly interact with the choice accuracy improvement caused by nicotine. Acute challenge with a range of quinpirole doses also did not affect the facilitating effect of chronic nicotine. This stands in contrast to the significant interactions of D2 systems with acute nicotine effects. Acute and chronic nicotine administration have similar effects of facilitating memory performance in the radial-arm maze. However, these effects appear to have differential interactions with D2 systems.
Levin, ED; Christopher, NC; Briggs, SJ; Todd Auman, J
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