Metabotropic group II glutamate receptors in the basolateral amygdala mediate cue-triggered increases in incentive motivation

被引:2
作者
Garceau, Caroline [1 ]
Samaha, Anne-Noel [1 ,2 ]
Cordahi, Thomas [3 ]
Servonnet, Alice [3 ]
Khoo, Shaun Yon-Seng [1 ]
机构
[1] Univ Montreal, Fac Med, Dept Pharmacol & Physiol, Montreal, PQ H3T 1J4, Canada
[2] Univ Montreal, Fac Med, CNS Res Grp, Montreal, PQ H3T 1J4, Canada
[3] Univ Montreal, Fac Med, Dept Neurosci, Montreal, PQ H3T 1J4, Canada
基金
加拿大创新基金会;
关键词
Instrumental conditioning; Pavlovian conditioning; Pavlovian-to-instrumental transfer; Basolateral amygdala; Glutamate; mGlu(2/3) receptors; PAVLOVIAN-INSTRUMENTAL TRANSFER; AGONIST LY379268 ATTENUATE; NUCLEUS-ACCUMBENS CORE; INDUCED REINSTATEMENT; FOS EXPRESSION; COCAINE; SEEKING; REWARD; ACTIVATION; CONSOLIDATION;
D O I
10.1007/s00213-021-05907-7
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Rationale Reward-associated cues can trigger incentive motivation for reward and invigorate reward-seeking behaviour via Pavlovian-to-instrumental transfer (PIT). Glutamate signaling within the basolateral amygdala (BLA) modulates cue-triggered increases in incentive motivation. However, the role of BLA metabotropic group II glutamate (mGlu(2/3)) receptors is largely unknown. Objectives In Experiment 1, we characterized cue-triggered increases in incentive motivation for water reward using the PIT paradigm. In Experiment 2, we assessed the influence of intra-BLA microinjections of the mGlu(2/3) receptor agonist LY379268 on this effect. Methods Water-restricted male Sprague-Dawley rats learned to press a lever for water. Separately, they learned to associate one of two auditory cues with free water. On test days, rats could lever press under extinction conditions (no water), with intermittent, non-contingent CS+ and CS- presentations. In Experiment 1, rats were tested under baseline conditions. In Experiment 2, rats received intra-BLA microinjections of LY379268 (0, 3 and 6 mu g/hemisphere) before testing. Results Across experiments, CS+, but not CS-, presentations increased water-associated lever pressing during testing, even though responding was reinforced neither by water nor the CS+. Intra-BLA LY379268 abolished both CS+ potentiated pressing on the water-associated lever and CS+ evoked conditioned approach to the site of water delivery. LY379268 did not influence locomotion or instrumental and Pavlovian response rates during intervals between CS presentations or during the CS-, indicating no motor effects. Conclusions mGlu(2/3) receptor activity in the BLA mediates cue-triggered potentiation of incentive motivation for reward, suppressing both cue-induced increases in instrumental pursuit of the reward and anticipatory approach behaviour.
引用
收藏
页码:2905 / 2917
页数:13
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