Hayen Anja, Meese-Tamuri Saira, Gates Amy, Ito Rutsuko
Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford, OX1 3UD, UK.
Psychopharmacology (Berl). 2014 Jun;231(12):2483-92. doi: 10.1007/s00213-013-3414-0. Epub 2014 Jan 16.
Increasing evidence points to the prelimbic (PL) and infralimbic (IL) cortices of the medial prefrontal cortex (mPFC) and their dopaminergic innervations subserving opposing roles in the regulation of instrumental behavior. However, it is at present unclear if they hold similar roles in the regulation of Pavlovian learning.
The present study investigated the role of the dopaminergic innervations of the PL and IL in the modulation of Pavlovian appetitive cue and place conditioning, previously shown to be dependent on the basolateral amygdala and hippocampus, respectively.
Rats received preconditioning microinfusions of D-amphetamine, cis-flupenthixol, or vehicle solution directly into the PL or IL and were trained to simultaneously acquire conditioned cue and place preference in a radial maze.
Preconditioning blockade of dopamine neurotransmission in the PL and amphetamine microinfusions in the IL had the same effect of attenuating place conditioning. In contrast, place conditioning remained intact following preconditioning amphetamine microinfusions in the PL and dopamine receptor blockade in the IL. Instead, conditioned cue preference was attenuated following IL dopamine receptor blockade.
These data indicate that PL dopaminergic mechanisms are critical for the acquisition of appetitive place learning, while IL dopamine may oppose the influence of PL dopamine upon hippocampal-dependent learning. Furthermore, they implicate a functional reciprocity between mPFC and associated subregions of the nucleus accumbens in the regulation of limbic information processing.
越来越多的证据表明,内侧前额叶皮质(mPFC)的前边缘(PL)和下边缘(IL)皮质及其多巴胺能神经支配在工具性行为调节中发挥着相反的作用。然而,目前尚不清楚它们在巴甫洛夫学习调节中是否具有类似作用。
本研究调查了PL和IL的多巴胺能神经支配在巴甫洛夫式食欲线索调节和位置条件反射中的作用,先前研究表明这分别依赖于基底外侧杏仁核和海马体。
给大鼠在PL或IL中预先注入D-苯丙胺、顺式氟奋乃静或溶剂,然后训练它们在放射状迷宫中同时获得条件线索偏好和位置偏好。
预先阻断PL中的多巴胺神经传递以及在IL中注入苯丙胺,对减弱位置条件反射具有相同的效果。相反,在PL中预先注入苯丙胺以及阻断IL中的多巴胺受体后,位置条件反射保持完好。相反,阻断IL中的多巴胺受体后,条件线索偏好减弱。
这些数据表明,PL多巴胺能机制对获得食欲性位置学习至关重要,而IL多巴胺可能会对抗PL多巴胺对海马体依赖性学习的影响。此外,它们表明在边缘信息处理调节中,mPFC与伏隔核相关亚区域之间存在功能互惠关系。