Effects of context-drug learning on synaptic connectivity in the basolateral nucleus of the amygdala in rats.

Effects of context-drug learning on synaptic connectivity in the basolateral nucleus of the amygdala in rats.
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DOI:
10.1111/ejn.12781
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发表时间:
2015-01
期刊:
The European journal of neuroscience
影响因子:
--
通讯作者:
Meredith GE
Meredith GE
中科院分区:
其他
文献类型:
--
作者:
Rademacher DJ;Mendoza-Elias N;Meredith GE

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情境药物学习会在杏仁核基底外侧核(BLA)的电路中产生结构和功能突触变化。然而,突触变化如何转化为神经元靶点尚未确定。因此,在本研究中,免疫组织化学与细胞特异性标记物和突触的体视学定量被用来确定是否上下文药物学习的兴奋性和抑制性/调节性突触的数量增加接触γ-氨基丁酸(GABA)中间神经元和/或锥体神经元的BLA电路。苯丙胺条件性位置偏爱(AMPH CPP)的数量增加的不对称(兴奋性)突触接触锥体神经元的棘和树突和接触锥体神经元和GABA中间神经元的多突触扣的数量。上下文药物学习增加GABA中间神经元树突上的不对称(兴奋性)突触和增加树突上的对称(抑制性或调节性)突触,但这些相同的中间神经元的胞体。背景药物关联的形成改变了BLA回路中的突触连接,这一发现对药物寻求行为具有重要意义。
Context-drug learning produces structural and functional synaptic changes in the circuitry of the basolateral nucleus of the amygdala (BLA). However, how the synaptic changes translated to the neuronal targets was not established. Thus, in the present study, immunohistochemistry with a cell specific marker and the stereological quantification of synapses was used to determine if context-drug learning increases the number of excitatory and inhibitory/modulatory synapses contacting the gamma-aminobutyric acid (GABA) interneurons and/or the pyramidal neurons in the BLA circuitry. Amphetamine conditioned place preference (AMPH CPP) increased the number of asymmetric (excitatory) synapses contacting the spines and dendrites of pyramidal neurons and the number of multisynaptic boutons contacting pyramidal neurons and GABA interneurons. Context-drug learning increased asymmetric (excitatory) synapses onto dendrites of GABA interneurons and increased symmetric (inhibitory or modulatory) synapses onto dendrites but not perikarya of these same interneurons. The formation of context-drug associations alters the synaptic connectivity in the BLA circuitry, findings that have important implications for drug-seeking behavior.
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