Withdrawal from Fixed-Dose Injection of Methamphetamine Decreases Cerebral Levels of 3-Methoxy-4-hydroxyphenylglycol and Induces the Expression of Anxiety-Related Behavior in Mice |
| |
Authors: | Nobue Kitanaka Junichi Kitanaka Tomohiro Tatsuta Koh-ichi Tanaka Kaname Watabe Nobuyoshi Nishiyama Yoshio Morita Motohiko Takemura |
| |
Institution: | (1) Department of Pharmacology, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan;(2) Department of Neuropsychiatry, Hyogo College of Medicine, Hyogo 663-8501, Japan;(3) Division of Pharmacology, Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences, Hyogo 650-8530, Japan;(4) Technical Department, Muromachi Kikai Co., Ltd., Tokyo 103-0022, Japan; |
| |
Abstract: | A variety of drug treatment regimens have been proposed to model the dysphoric state observed during methamphetamine (METH)
withdrawal in rats, but little has been established in experiments using mice. In male ICR mice, a fixed-dose injection regimen
of METH (1.0 or 2.5 mg/kg, i.p., twice daily for 10 consecutive days) induced a significant decrease in the time spent in
open arms in an elevated plus maze after 5 days of drug abstinence. Under an escalating-dose injection regimen (0.2–2.0 mg/kg,
i.p., 3 times daily for 4 days, total: 15 mg/kg/animal) or continuous subcutaneous administration with osmotic mini-pumps
(15 or 76 mg/kg of METH for 2 weeks), no significant behavioral change was observed after 5 days of drug abstinence, compared
with control animals. Reduced gains in body weight were observed during repeated treatment with METH in the fixed-dose injection
and mini-pump treatment regimens, but not the escalating-dose injection regimen. HPLC analysis revealed significant decreases
in the level of cerebral 3-methoxy-4-hydroxyphenylglycol, a norepinephrine metabolite, and norepinephrine turnover, which
may be attributed to the expression of anxiety-related behavior in the elevated plus maze. These observations suggest that
the mice treated with a fixed-dose of METH may model the anxiety-related behavior observed in the dysphoric state induced
by METH withdrawal in humans. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|