Aging impairs methamphetamine-induced free-running and anticipatory locomotor activity rhythms in rats

Shigenobu Shibata, Yoshitsugu Minamoto, Michiko Ono, Shigenori Watanabe

研究成果: Article

19 引用 (Scopus)

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In the present experiment, under drinking of 0.01% methamphetamine (MA), young rats exhibited free-running locomotor rhythm ranging from 24.6 to 30.9 h period under light-dark cycle. In contrast, 24-month-old rats showed a low activity and did not exhibit MA-induced free-running rhythm. When MA was injected at a fixed time of day (14:00), young rats exhibited intense locomotor activity from 1-2 h before drug-injection time. This preinjection activity was still detected on the withdrawal day. In addition, intense locomotor activity was observed for 12:00-17:00, even on the withdrawal day (MA-associated anticipatory activity). Thus, MA-associated activity of the withdrawal day became an another good index for MA anticipatory activity rhythms whereas old rats did not exhibit this anticipatory activity. The present study suggests that aging strongly impairs the manifestation of MA-induced free-running and anticipatory activity rhythms in rats.

元の言語English
ページ(範囲)107-110
ページ数4
ジャーナルNeuroscience Letters
172
発行部数1-2
DOI
出版物ステータスPublished - 1994 5 19

ASJC Scopus subject areas

  • Neuroscience(all)

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