首页> 外文期刊>Pharmacology, Biochemistry and Behavior >Low-dose apomorphine attenuates morphine-induced enhancement of brain stimulation reward.
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Low-dose apomorphine attenuates morphine-induced enhancement of brain stimulation reward.

机译:小剂量的阿扑吗啡减弱了吗啡诱导的脑刺激奖励的增强。

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摘要

Thresholds for brain stimulation reward (BSR) delivered to the medial forebrain bundle-lateral hypothalamus were determined by means of a rate free psychophysical method. Lower doses of apomorphine (0.5 to 0.2 mg/kg) produced modest elevations in BSR thresholds. A 0.4 mg/kg dose of apomorphine resulted in emergence of stereotypic behaviors and the loss of stimulus control. Morphine's BSR threshold lowering effects were significantly blocked by the concurrent administration of a 0.1 mg/kg dose of apomorphine. These results support the hypothesis that presynaptic dopamine neurons are involved in the mediation of morphine's reinforcing effects and that dopamine autoreceptor agonists may be of some use in the pharmacotherapy of opiate abuse.
机译:通过无速率心理生理学方法确定传递至内侧前脑束-下丘脑的脑刺激奖励(BSR)阈值。较低剂量的阿扑吗啡(0.5至0.2 mg / kg)可使BSR阈值适度升高。 0.4 mg / kg剂量的阿扑吗啡导致出现定型行为和失去刺激控制。并用0.1 mg / kg剂量的阿扑吗啡可显着抑制吗啡的BSR阈值降低作用。这些结果支持以下假设:突触前多巴胺神经元参与吗啡的增强作用的介导,而多巴胺自身受体激动剂可能在鸦片滥用的药物治疗中有一定用途。

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