αCaMKII in the lateral amygdala mediates PTSD-Like behaviors and NMDAR-Dependent LTD.

αCaMKII in the lateral amygdala mediates PTSD-Like behaviors and NMDAR-Dependent LTD.
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外侧杏仁核中的 α CaMKII 介导 PTSD 样行为和 NMDAR 依赖性 LTD

DOI:
10.1016/j.ynstr.2021.100359
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发表时间:
2021-11
影响因子:
5
通讯作者:
Cao X
Cao X
中科院分区:
医学2区
文献类型:
--
作者:
An S;Wang J;Zhang X;Duan Y;Xu Y;Lv J;Wang D;Zhang H;Richter-Levin G;Klavir O;Yu B;Cao X

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创伤后应激障碍(PTSD)是一种困扰许多人的精神障碍。然而,其分子和细胞机制在很大程度上仍未被探索。在这里,我们发现创伤后应激障碍易感小鼠杏仁外侧核(LA)中的α-钙/钙调素依赖的激酶II(αCaMKII)显著上调。在丘脑外侧杏仁核(T-LA)突触中,持续增加GluA1Ser845/Ser831去磷酸化和a-amino-3-hydroxy-5-methyl-4-isoxazolepropionic酸受体(AMPAR)内化,不仅可引起创伤后应激障碍样行为,如恐惧消退和焦虑样行为,还可减弱丘脑-外侧杏仁核(T-LA)突触的N-甲基-D-天冬氨酸受体(α)依赖的长时抑郁(LTD)。抑制升高的αCaMKII至正常水平可完全挽救PTSD样行为和LTD、GluA1-Ser845/Ser831去磷酸化和AMPAR内化的损害。有趣的是,GluA1-Ser845/Ser831去磷酸化和AMPAR内化的缺陷不仅在受损的恐惧消退后被检测到,而且在弱化LTD后也被检测到。我们的结果提示LA中的αCaMKII可能是PTSD的一个潜在的分子决定因素。我们还首次证明了GluA1-Ser845/Ser831去磷酸化和AMPAR内化是恐惧消退和LTD之间的分子联系。
Post-traumatic stress disorder (PTSD) is a psychiatric disorder that afflicts many individuals. However, its molecular and cellular mechanisms remain largely unexplored. Here, we found PTSD susceptible mice exhibited significant up-regulation of alpha-Ca2+/calmodulin-dependent kinase II (αCaMKII) in the lateral amygdala (LA). Consistently, increasing αCaMKII in the LA not only caused PTSD-like behaviors such as impaired fear extinction and anxiety-like behaviors, but also attenuated N-methyl-D-aspartate receptor (NMDAR)-dependent long-term depression (LTD) at thalamo-lateral amygdala (T-LA) synapses, and reduced GluA1-Ser845/Ser831 dephosphorylation and a-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) internalization. Suppressing the elevated αCaMKII to normal levels completely rescued both PTSD-like behaviors and the impairments in LTD, GluA1-Ser845/Ser831 dephosphorylation, and AMPAR internalization. Intriguingly, deficits in GluA1-Ser845/Ser831 dephosphorylation and AMPAR internalization were detected not only after impaired fear extinction, but also after attenuated LTD. Our results suggest that αCaMKII in the LA may be a potential molecular determinant of PTSD. We further demonstrate for the first time that GluA1-Ser845/Ser831 dephosphorylation and AMPAR internalization are molecular links between fear extinction and LTD.
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