Cocaine but not natural reward self-administration nor passive cocaine infusion produces persistent LTP in the VTA.
Cocaine but not natural reward self-administration nor passive cocaine infusion produces persistent LTP in the VTA.
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可卡因,但不是自然奖励自我给药或被动可卡因输注在VTA中产生持久的LTP。
DOI:
10.1016/j.neuron.2008.05.024
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发表时间:
2008-07-31
期刊:
影响因子:
16.2
通讯作者:
Bonci A
中科院分区:
文献类型:
--
作者:
Chen BT;Bowers MS;Martin M;Hopf FW;Guillory AM;Carelli RM;Chou JK;Bonci A
Persistent drug-seeking behavior is hypothesized to co-opt the brain's natural reward-motivational system. Although ventral tegmental area (VTA) dopamine (DA) neurons represent a crucial component of this system, the synaptic adaptations underlying natural rewards and drug-related motivation have not been fully elucidated. Here we show that self-administration of cocaine, but not passive cocaine infusions, produced a persistent potentiation of VTA excitatory synapses, which was still present after 3 months abstinence. Further, enhanced synaptic function in VTA was evident even after 3 weeks of extinction training. Food or sucrose self-administration induced only a transient potentiation of VTA glutamatergic signaling. Our data show that synaptic function in VTA DA neurons is readily but reversibly enhanced by natural reward-seeking behavior, while voluntary cocaine self-administration induced a persistent synaptic enhancement that is resistant to behavioral extinction. Such persistent synaptic potentiation in VTA DA neurons may represent a fundamental cellular phenomenon driving pathological drug-seeking behavior.
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