The selective serotonin1A-receptor antagonist WAY 100635 blocks behavioral stimulating effects of cocaine but not ventral striatal dopamine increase

The selective serotonin1A-receptor antagonist WAY 100635 blocks behavioral stimulating effects of cocaine but not ventral striatal dopamine increase
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选择性 5-羟色胺 1A 受体拮抗剂 WAY 100635 可阻断可卡因的行为刺激作用,但不会阻断腹侧纹状体多巴胺的增加

DOI:
10.1016/s0166-4328(02)00042-6
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发表时间:
2002
影响因子:
2.7
通讯作者:
J. Huston
J. Huston
中科院分区:
心理学3区
文献类型:
--
作者:
C. Müller;M. A. D. S. Silva;G. DePalma;C. Tomaz;R. Carey;J. Huston

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细胞外多巴胺(DA)浓度的增加通常被认为是可卡因行为效应的重要神经化学介质。可卡因诱导的多巴胺能(5-HT)活性增加似乎也参与了这些作用。在这里,我们描述了5-HT 1A受体拮抗剂WAY 100635对可卡因的行为和神经化学作用的影响。在体微透析法测定大鼠延髓外侧核(Nac)内多巴胺(DA)的浓度。四组动物接受以下药物组合之一:WAY 100635(0.4 mg/kg)和可卡因(10 mg/kg)、盐水和可卡因(10 mg/kg)、WAY 100635(0.4 mg/kg)和盐水或盐水和盐水。腹腔注射,间隔20分钟。WAY 100635预处理显著减弱了可卡因的运动兴奋作用,而不改变NAC中的DA溢出。WAY 100635本身并没有改变运动或Nac中细胞外DA浓度。这些结果表明:(1)5-HT_(1A)受体是可卡因运动兴奋作用的重要组成部分;(2)NAc内DA含量的增加可能是可卡因运动兴奋作用的必要条件,但不是充分条件。
An increase in the extracellular dopamine (DA) concentration is generally accepted as an important neurochemical mediator of the behavioral effects of cocaine. Cocaine induced increases in serotonergic (5-HT) activity also appears to be involved in these effects. Here we describe the effects of the 5-HT1A-receptor antagonist WAY 100635 on the behavioral and neurochemical effects of cocaine. In-vivo micordialysis was used in behaving rats to measure extracellular concentration of DA in the nucleus accumbens (Nac). Four groups of animals received one of the following drug combinations: WAY 100635 (0.4 mg/kg) and cocaine (10 mg/kg), saline and cocaine (10 mg/kg), WAY 100635 (0.4 mg/kg) and saline, or saline and saline. The injections were administered i.p. and spaced 20 min apart. The pretreatment with WAY 100635 significantly attenuated the locomotor stimulant effects of cocaine without altering the DA overflow in the Nac. WAY 100635 itself did not modify locomotion or the extracellular DA concentration in the Nac. These results indicate that (1) the 5-HT1A-receptor is an important component in the mediation of cocaine locomotor stimulant effects, and (2) an increase in the extracellular DA concentration in the NAc might be a necessary but is not a sufficient condition for the locomotor stimulant effects of cocaine.
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