Long-continuous observation of the effects of methamphetamine on wheel-running and drinking in mice

• Published in: Progress in neuro-psychopharmacology & biological psychiatry Vol. 18; no. 2; p. 397
• Main Authors: Uchihashi, Y, Kuribara, H, Yasuda, H, Umezu, T, Tadokoro, S
• Format: Journal Article
• Language: English
• Published: England 01-03-1994
• Subjects: Animals; Circadian Rhythm - drug effects; Dose-Response Relationship, Drug; Drinking - drug effects; Male; Methamphetamine - administration & dosage; Methamphetamine - pharmacology; Mice; Mice, Inbred Strains; Motor Activity - drug effects
• ISSN: 0278-5846
• DOI: 10.1016/0278-5846(94)90071-x

1. Effects of methamphetamine (MAP) on wheel-running and drinking in mice, housed under 12-hr light-dark schedule (light period; 06:00-18:00), were investigated through long-continuous observation. 2. MAP (1, 2 and 4 mg/kg, s.c.) acutely increased the wheel-running and drinking for 2-4 hr in a dose-dependent manner after the administration at 11:00, midpoint of light period. 3. MAP administered at 11:00 sub-acutely suppressed the spontaneous increment during dark period (18:00-06:00) in both the behaviors. 4. Many factors, such as the time-of-day and interval of the administration as well as the dose administered, affected the behavioral suppression induced by MAP. 5. In addition to these findings, the wheel-running and drinking during the light period increased even on the days without MAP administration. 6. These results suggest that MAP have not only acute stimulant and sub-acute depressant effects, but also long-lasting effects.