Unconditioned- and Conditioned- Stimuli Induce Differential Memory Reconsolidation and β-AR-Dependent CREB Activation.

Unconditioned- and Conditioned- Stimuli Induce Differential Memory Reconsolidation and β-AR-Dependent CREB Activation.
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非条件刺激和条件刺激诱导差异记忆再巩固和β-AR依赖性CREB激活

DOI:
10.3389/fncir.2017.00053
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发表时间:
2017
影响因子:
3.5
通讯作者:
Ma L
Ma L
中科院分区:
医学3区
文献类型:
--
作者:
Huang B;Zhu H;Zhou Y;Liu X;Ma L

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巩固的长期恐惧记忆变得不稳定,并在提取时通过呈现条件刺激(CS)或无条件刺激(US)而重新巩固。CS检索和US检索是否会触发不同的记忆再巩固过程尚不清楚。在这项研究中,我们引入了一种顺序恐惧条件反射范式,在该范式中,脚电击(FS)与两种不同的声音(CS-A和CS-B)配对。US(FS)恢复后应用β肾上腺素能受体(β-AR)拮抗剂心得安可抑制CS-A或CS-B引起的冰冻行为。选择性β1-AR拮抗剂倍他洛尔也有类似的作用。然而,一个CS(如CS-A)回收后的心得安治疗只抑制同一CS(即CS-A)引起的冰冻行为,而不能抑制另一个CS(CS-B)引起的冰冻行为。这些数据表明,β-AR在US-和CS-提取引发的恐惧记忆的再巩固中起关键作用,而US-提取后阻断β-AR比CS-提取对CS-US联系产生更多的干扰。此外,US修复后,CREB在几乎整个杏仁核和海马区均有显著激活,而CS修复仅在杏仁外侧核和海马CA3区激活CREB。此外,心得安治疗可抑制记忆恢复诱导的CREB激活。这些数据表明,US提取比CS提取激活了更多的记忆痕迹,导致更多CS-US联系的记忆重新巩固。
Consolidated long-term fear memories become labile and reconsolidated upon retrieval by the presentation of conditioned stimulus (CS) or unconditioned stimulus (US). Whether CS-retrieval or US-retrieval will trigger different memory reconsolidation processes is unknown. In this study, we introduced a sequential fear conditioning paradigm in which footshock (FS) was paired with two distinct sounds (CS-A and CS-B). The treatment with propranolol, a β-adrenergic receptor (β-AR) antagonist, after US (FS)-retrieval impaired freezing behavior evoked by either CS-A or CS-B. Betaxolol, a selective β1-AR antagonist, showed similar effects. However, propranolol treatment after retrieval by one CS (e.g., CS-A) only inhibited freezing behavior evoked by the same CS (i.e., CS-A), not the other CS (CS-B). These data suggest that β-AR is critically involved in reconsolidation of fear memory triggered by US- and CS-retrieval, whereas β-AR blockade after US-retrieval disrupts more CS-US associations than CS-retrieval does. Furthermore, significant CREB activation in almost the whole amygdala and hippocampus was observed after US-retrieval, but CS-retrieval only stimulated CREB activation in the lateral amygdala and the CA3 of hippocampus. In addition, propranolol treatment suppressed memory retrieval-induced CREB activation. These data indicate that US-retrieval activates more memory traces than CS-retrieval does, leading to memory reconsolidation of more CS-US associations.
DOI: 10.1016/j.nlm.2005.12.008
发表时间: 2006-09-01
影响因子: 2.7
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期刊: Learning & memory (Cold Spring Harbor, N.Y.)
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影响因子: 3.5
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发表时间: 2001-11-01
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