首页> 外文期刊>Pharmacology, Biochemistry and Behavior >Acute and chronic fluoxetine treatment decreases the sensitivity of rats to rewarding brain stimulation.
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Acute and chronic fluoxetine treatment decreases the sensitivity of rats to rewarding brain stimulation.

机译:急性和慢性氟西汀治疗会降低大鼠对奖励性脑刺激的敏感性。

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The effects of fluoxetine on rewarding brain stimulation were determined in eight Wistar rats using a rate-independent discrete-trial threshold measure. Rats were implanted with bipolar, stainless steel electrodes either into the ventral tegmental area (VTA) or medial forebrain bundle (MFB). Acute administration of fluoxetine significantly raised the reward threshold (decreased sensitivity) at doses of 2.5, 5.0, 10.0, and 20.0 mg/kg, i.p., without altering latency of response. There were no significant differences between VTA and MFB groups. To determine the effects of chronic treatment, daily injections of 5.0 mg/kg fluoxetine were administered to rats for 21 days. Chronic treatment of fluoxetine continued to significantly elevate reward thresholds with no evidence of tolerance. The results of these experiments suggest that fluoxetine does not possess abuse potential and that serotonin produces an inhibitory effect on the mesolimbic dopaminergic reward system. Furthermore, these results suggest that the antidepressant effects of fluoxetine are not the direct result of excitation of brain reward systems, at least in the same manner as abused substances, for example, cocaine.
机译:氟西汀对奖励性脑刺激的影响是通过使用速率独立的离散试验阈值测量法在八只Wistar大鼠中确定的。将大鼠双极不锈钢电极植入腹侧被盖区(VTA)或前脑内侧束(MFB)。氟西汀的急性给药以2.5、5.0、10.0和20.0 mg / kg的剂量i.p.显着提高了奖励阈值(敏感性降低),而没有改变反应潜伏期。 VTA组和MFB组之间没有显着差异。为了确定慢性治疗的效果,每天给大鼠注射5.0 mg / kg氟西汀,持续21天。氟西汀的长期治疗继续显着提高奖励阈值,而没有耐受的证据。这些实验的结果表明,氟西汀不具有滥用潜力,而5-羟色胺对中脑边缘多巴胺能奖赏系统产生抑制作用。此外,这些结果表明氟西汀的抗抑郁作用不是激发大脑奖励系统的直接结果,至少与滥用药物(例如可卡因)的方式相同。

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