Convergence of Reinforcing and Anhedonic Cocaine Effects in the Ventral Pallidum.

Convergence of Reinforcing and Anhedonic Cocaine Effects in the Ventral Pallidum.
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DOI:
10.1016/j.neuron.2016.09.001
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发表时间:
2016-10-05
期刊:
影响因子:
16.2
通讯作者:
Lüscher C
Lüscher C
中科院分区:
医学1区
文献类型:
--
作者:
Creed M;Ntamati NR;Chandra R;Lobo MK;Lüscher C

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成瘾是一种行为症状的紊乱,包括药物相关线索的激励显著性增强,但也是一种消极的情感状态。在奖赏系统中,可卡因诱发的突触可塑性,特别是伏隔核(NAc),驱动药物适应行为。然而,NAc下游的信息如何整合仍不清楚。在这里,我们确定腹侧白质(VP)是表达NAc的多巴胺(DA)受体1型(D1-MSNs)和2型(D2-MSNs)的中棘神经元的聚集部位。体内重复的可卡因暴露增强了D1-MSNs的输出,但减弱了D2-MSNs的输出,分别阻断了这些突触的LTP和LTD。有选择地恢复d1 - msn - vp突触的基础传递消除了运动敏化,而恢复d2 - msn - vp突触的传递使动机缺陷正常化。我们的研究结果支持一个模型,通过药物诱发的突触可塑性在副脑脊液介导对立的行为症状;靶向VP可能为成瘾障碍提供新的治疗策略。Creed等人发现D1-和d2 - msn与腹侧苍白球之间存在不同形式的可塑性。可卡因暴露阻断了D1-VP和D2-VP突触的活性依赖性LTP和LTD。这些突触的传递介导了成瘾的不同行为症状。
Addiction is a disorder of behavioral symptoms including enhanced incentive salience of drug-associated cues, but also a negative affective state. Cocaine-evoked synaptic plasticity in the reward system, particularly the nucleus accumbens (NAc), drives drug-adaptive behavior. However, how information is integrated downstream of the NAc remains unclear. Here, we identify the ventral pallidum (VP) as a site of convergence of medium spiny neurons expressing dopamine (DA) receptor type 1 (D1-MSNs) and type 2 (D2-MSNs) of the NAc. Repeated in vivo cocaine exposure potentiated output of D1-MSNs, but weakened output of D2-MSNs, occluding LTP and LTD at these synapses, respectively. Selectively restoring basal transmission at D1-MSN-to-VP synapses abolished locomotor sensitization, whereas restoring transmission at D2-MSN-to-VP synapses normalized motivational deficits. Our results support a model by which drug-evoked synaptic plasticity in the VP mediates opposing behavioral symptoms; targeting the VP may provide novel therapeutic strategies for addictive disorders. Creed et al. identify distinct forms of plasticity between D1- and D2-MSNs and the ventral pallidum. Cocaine exposure occluded activity-dependent LTP and LTD at D1-VP and D2-VP synapses. Transmission at these synapses mediates distinct behavioral symptoms of addiction.
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