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多巴胺拮抗剂对经甲基苯丙胺急性和慢性处理的大鼠纹状体中神经元组胺释放的影响。

Effects of dopamine antagonists on neuronal histamine release in the striatum of rats subjected to acute and chronic treatments with methamphetamine.

作者信息

Ito C, Onodera K, Sakurai E, Sato M, Watanabe T

机构信息

Department of Psychiatry, Tohoku University School of Medicine, Japan.

出版信息

J Pharmacol Exp Ther. 1996 Oct;279(1):271-6.

PMID:8859003
Abstract

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.

摘要

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。

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