Nicotine ameliorates impairment of working memory in methamphetamine-treated rats

Hiroyuki Mizoguchi, Daisuke Ibi, Fumiaki Takase, Taku Nagai, Hiroyuki Kamei, Erika Toth, Jun Sato, Kazuhiro Takuma, Kiyofumi Yamada

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Nicotine is hypothesized to have therapeutic effects on attentional and cognitive abnormalities in psychosis. In this study, we investigated the effect of nicotine on impaired spatial working memory in repeated methamphetamine (METH)-treated rats. Rats were administered METH (4. mg/kg, s.c.) once a day for 7 days, and their working memory was assessed with a delayed spatial win-shift task in a radial arm maze. The task consisted of two phases, a training phase and a test phase, separated by a delay. Control animals showed impaired performance in the test phase when the delay time was increased to 120. min or longer, while METH-treated rats showed impaired performance with a shorter delay time of 90. min. Memory impairment in METH-treated rats persisted for at least 14 days after drug withdrawal. METH-induced impairment of working memory was reversed by nicotine (0.3. mg/kg, p.o., for 7 days), but the effect was diminished 7 days after the withdrawal. In control rats, nicotine decreased the number of working memory errors in the test with delay time of 120. min when administered before the training phase. Neither post-training nor pre-test administration of nicotine had any effect on working memory. These findings suggest that nicotine may have some protective effect against the impairment of working memory.

Original languageEnglish
Pages (from-to)159-163
Number of pages5
JournalBehavioural Brain Research
Volume220
Issue number1
DOIs
Publication statusPublished - 20-06-2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Behavioral Neuroscience

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