Effect of melatonin on methamphetamine- and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced dopaminergic neurotoxicity and methamphetamine-induced behavioral sensitization

被引:52
作者
Itzhak, Y
Martin, JL
Black, MD
Ali, SF
机构
[1] Univ Miami, Sch Med, Dept Biochem & Mol Biol R62A, Miami, FL 33101 USA
[2] US FDA, Natl Ctr Toxicol Res, Div Neurotoxicol, Neurochem Lab, Jefferson, AR USA
关键词
methamphetamine; MPTP; melatonin; dopaminergic neurotoxicity; free radicals; locomotor activity; sensitization;
D O I
10.1016/S0028-3908(98)00067-7
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Methamphetamine (METH)- and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced dopaminergic neurotoxicity is thought to be associated with the formation of free radicals. Since evidence suggests that melatonin may act as a free radical scavenger and antioxidant, the present study was undertaken to investigate the effect of melatonin on METH- and MPTP-induced neurotoxicity. In addition, the effect of melatonin on METH-induced locomotor sensitization was investigated. The administration of METH (5 mg kg(-1) x 3) or MPTP (20 mg kg(-1) x 3) to Swiss Webster mice resulted in 45-57% depletion in the content of striatal dopamine and its metabolites, 3,4-dihydroxyphenylacetic acid and homovanillic acid, and 57-59% depletion in dopamine transporter binding sites. The administration of melatonin (10 mg kg(-1)) before each of the three injections of the neurotoxic agents (on day 1), and thereafter for two additional days, afforded a full protection against METH-ieduced depletion of dopamine and its metabolites and dopamine transporter binding sites. In addition, melatonin significantly diminished METH-induced hyperthermia. However, the treatment with melatonin had no significant effect on MPTP-induced depletion of the dopaminergic markers tested. In the set of behavioral experiments, we found that the administration of 1 mg kg(-1) METH to Swiss Webster mice for 5 days resulted in marked locomotor sensitization to a subsequent challenge injection of METH, as well as context-dependent sensitization (conditioning). The pretreatment with melatonin (10 mg kg(-1)) prevented neither the sensitized response to METH nor the development of conditioned locomotion. Results of the present study indicate that melatonin has a differential effect on the dopaminergic neurotoxicity produced by METH and MPTP. Since it is postulated that METH-induced hyperthermia is related to its neurotoxic effect, while regulation of body temperature is unrelated to MPTP-induced neurotoxicity or METH-induced locomotor sensitization, the protective effect of melatonin observed in the present study may be due primarily to diminishing METH-induced hyperthermia. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:781 / 791
页数:11
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