Ito C, Onodera K, Sakurai E, Sato M, Watanabe T
Department of Psychiatry, Tohoku University School of Medicine, Japan.
J Pharmacol Exp Ther. 1996 Oct;279(1):271-6.
In this study, we examined the changes in neuronal histamine (HA) release in the rat striatum after acute and repeated administration of methamphetamine (METH). We studied the regulation of METH-induced HA release by dopamine receptors and the relationship between METH-induced HA release and stereotyped behavior. Acute administration of METH (1 mg/kg) significantly increased HA release 60 min later. Pretreatments with the dopamine D2 antagonists sulpiride and haloperidol blocked the METH-induced increase of HA release, whereas pretreatment with a dopamine D1 antagonist, SCH23390, did not. Moreover, repeated administration of METH (3 mg/kg) greatly enhanced the METH-induced increase of HA release 60, 80, 100, 120 and 180 min after rechallenge of METH (1 mg/kg). Repeated treatment with haloperidol and METH blocked the increase of HA release induced by the rechallenge of METH. The METH-induced increase of HA release was still found after the METH-induced stereotyped behavior decreased in both acute and repeated administrations of METH. These findings suggest that the METH-induced HA release in the striatum is controlled by dopamine D2 receptors and may play an important inhibitory role in the METH-induced stereotyped behavior. Furthermore, a persistent change in the HA neuron system through DA neurotransmission may be partially responsible for the METH-induced behavioral sensitization.
在本研究中,我们检测了大鼠纹状体中急性和重复给予甲基苯丙胺(METH)后神经元组胺(HA)释放的变化。我们研究了多巴胺受体对METH诱导的HA释放的调节作用以及METH诱导的HA释放与刻板行为之间的关系。急性给予METH(1mg/kg)60分钟后显著增加了HA释放。用多巴胺D2拮抗剂舒必利和氟哌啶醇预处理可阻断METH诱导的HA释放增加,而用多巴胺D1拮抗剂SCH23390预处理则无此作用。此外,重复给予METH(3mg/kg)在再次给予METH(1mg/kg)后60、80、100、120和180分钟时极大地增强了METH诱导的HA释放增加。用氟哌啶醇和METH重复处理可阻断再次给予METH诱导的HA释放增加。在急性和重复给予METH过程中,METH诱导的刻板行为减少后仍可发现METH诱导的HA释放增加。这些发现表明,纹状体中METH诱导的HA释放受多巴胺D2受体控制,并且可能在METH诱导的刻板行为中起重要的抑制作用。此外,通过多巴胺神经传递导致的HA神经元系统的持续变化可能部分地导致了METH诱导的行为敏化。