Time-Dependent Recruitment of Prelimbic Prefrontal Circuits for Retrieval of Fear Memory

被引:13
|
作者
Quinones-Laracuente, Kelvin [1 ,2 ,3 ]
Vega-Medina, Alexis [1 ,2 ,4 ]
Quirk, Gregory J. [1 ,2 ]
机构
[1] Univ Puerto Rico, Sch Med, Dept Psychiat, Lab Gregory J Quirk, San Juan, PR 00936 USA
[2] Univ Puerto Rico, Sch Med, Dept Anat & Neurobiol, Lab Gregory J Quirk, San Juan, PR 00936 USA
[3] NYU, Dept Psychiat, Langone Med Ctr, 550 1St Ave, New York, NY 10016 USA
[4] Univ Michigan, Neurosci Grad Program, Ann Arbor, MI 48109 USA
来源
基金
美国国家科学基金会;
关键词
PL; amygdala; PVT; fear retrieval; time differences; BASOLATERAL AMYGDALA; CORTEX; EXTINCTION; NUCLEUS; PROJECTIONS; EXPRESSION; ANTERIOR; THALAMUS; INPUTS;
D O I
10.3389/fnbeh.2021.665116
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
The long-lasting nature of fear memories is essential for survival, but the neural circuitry for retrieval of these associations changes with the passage of time. We previously reported a time-dependent shift from prefrontal-amygdalar circuits to prefrontal-thalamic circuits for the retrieval of auditory fear conditioning. However, little is known about the time-dependent changes in the originating site, the prefrontal cortex. Here we monitored the responses of prelimbic (PL) prefrontal neurons to conditioned tones at early (2 h) vs. late (4 days) timepoints following training. Using c-Fos, we find that PL neurons projecting to the amygdala are activated early after learning, but not later, whereas PL neurons projecting to the paraventricular thalamus (PVT) show the opposite pattern. Using unit recording, we find that PL neurons in layer V (the origin of projections to amygdala) showed cue-induced excitation at earlier but not later timepoints, whereas PL neurons in Layer VI (the origin of projections to PVT) showed cue-induced inhibition at later, but not earlier, timepoints, along with an increase in spontaneous firing rate. Thus, soon after conditioning, there are conditioned excitatory responses in PL layer V which influence the amygdala. With the passage of time, however, retrieval of fear memories shifts to inhibitory responses in PL layer VI which influence the midline thalamus.
引用
收藏
页数:9
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