Mild blast events alter anxiety, memory, and neural activity patterns in the anterior cingulate cortex.

Mild blast events alter anxiety, memory, and neural activity patterns in the anterior cingulate cortex.
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DOI:
10.1371/journal.pone.0064907
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Tsien JZ
Tsien JZ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xie K;Kuang H;Tsien JZ

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人们普遍有兴趣了解暴露于情感创伤事件是否以及如何改变记忆功能和焦虑行为。在这里,我们开发了一种新的实验室版本的轻度爆炸暴露组成的高分贝炸弹爆炸声加上强烈的空气冲击波的小鼠。这个模型使我们能够将情感恐惧成分的影响与炸弹爆炸造成的创伤性脑损伤或身体损伤的影响分离开来。我们证明,这种轻微的爆炸暴露是能够损害物体识别记忆,增加焦虑高架O型迷宫测试,并导致上下文泛化。我们的体内神经系综记录表明,这种温和的爆炸暴露产生了不同的放电变化,在前扣带皮层,一个区域处理情绪记忆和抑制控制。此外,我们发现这些实时神经集成模式经历了事件后的回响,表明这些可怕的经历迅速巩固。识别爆炸引起的额叶神经活动变化可能使我们更好地理解轻微的爆炸经历如何导致记忆功能的异常变化和与创伤后应激障碍相关的过度恐惧泛化。
There is a general interest in understanding of whether and how exposure to emotionally traumatizing events can alter memory function and anxiety behaviors. Here we have developed a novel laboratory-version of mild blast exposure comprised of high decibel bomb explosion sound coupled with strong air blast to mice. This model allows us to isolate the effects of emotionally fearful components from those of traumatic brain injury or bodily injury typical associated with bomb blasts. We demonstrate that this mild blast exposure is capable of impairing object recognition memory, increasing anxiety in elevated O-maze test, and resulting contextual generalization. Our in vivo neural ensemble recording reveal that such mild blast exposures produced diverse firing changes in the anterior cingulate cortex, a region processing emotional memory and inhibitory control. Moreover, we show that these real-time neural ensemble patterns underwent post-event reverberations, indicating rapid consolidation of those fearful experiences. Identification of blast-induced neural activity changes in the frontal brain may allow us to better understand how mild blast experiences result in abnormal changes in memory functions and excessive fear generalization related to post-traumatic stress disorder.
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