Amygdala Nuclei Volume and Shape in Military Veterans With Posttraumatic Stress Disorder.

Amygdala Nuclei Volume and Shape in Military Veterans With Posttraumatic Stress Disorder.
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DOI:
10.1016/j.bpsc.2019.11.016
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发表时间:
2020-03
期刊:
Biological psychiatry. Cognitive neuroscience and neuroimaging
影响因子:
--
通讯作者:
LaBar KS
LaBar KS
中科院分区:
其他
文献类型:
--
作者:
Morey RA;Clarke EK;Haswell CC;Phillips RD;Clausen AN;Mufford MS;Saygin Z;VA Mid-Atlantic MIRECC Workgroup;Wagner HR;LaBar KS

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杏仁核是一种皮质下结构,参与社会情绪和联想恐惧学习过程,与理解创伤后应激障碍(PTSD)的机制相关。对动物的研究表明,杏仁核是一种异质结构,其中基底外侧和中心内侧部分很容易受到压力。虽然杏仁核复合体与 PTSD 的病理生理学有关,但我们对构成杏仁核复合体的各个核的具体贡献知之甚少。退伍军人 (n = 355),包括患有 PTSD 的退伍军人 (n = 149) 和没有 PTSD 的创伤暴露对照受试者 (n = 206),接受了高分辨率 T1 加权解剖扫描。 FreeSurfer 对杏仁核的自动分割产生了 9 个结构:基底核、外侧核、辅助基底核、前杏仁核、中央核、内侧核、皮质核和旁层核,以及皮质杏仁核过渡区。使用普通最小二乘回归与相关人口和临床回归量比较各组之间的次区域体积,然后对整个杏仁核进行 3 维形状分析。 PTSD 与较小的左侧和右侧外侧核和旁层核相关,但与较大的左侧和右侧中央、内侧和皮质核相关(p < .05,错误发现率已纠正)。形状分析显示,与对照组相比,PTSD 患者双侧杏仁核前部的径向距离较小,双侧杏仁核后部的雅可比行列式较低。特定杏仁核亚核体积的改变和区域形状扭曲与退伍军人的创伤后应激障碍有关。与 PTSD 相关的外侧核和中心内侧复合体的体积差异表现出一种亚区域特异性模式,这与其在恐惧学习和恐惧表达行为中的功能作用一致。
The amygdala is a subcortical structure involved in socioemotional and associative fear learning processes relevant for understanding the mechanisms of posttraumatic stress disorder (PTSD). Research in animals indicates that the amygdala is a heterogeneous structure in which the basolateral and centromedial divisions are susceptible to stress. While the amygdala complex is implicated in the pathophysiology of PTSD, little is known about the specific contributions of the individual nuclei that constitute the amygdala complex. Military veterans (n = 355), including military veterans with PTSD (n = 149) and trauma-exposed control subjects without PTSD (n = 206), underwent high-resolution T1-weighted anatomical scans. Automated FreeSurfer segmentation of the amygdala yielded 9 structures: basal, lateral, accessory basal, anterior amygdaloid, and central, medial, cortical, and paralaminar nuclei, along with the corticoamygdaloid transition zone. Subregional volumes were compared between groups using ordinary-least-squares regression with relevant demographic and clinical regressors followed by 3-dimensional shape analysis of whole amygdala. PTSD was associated with smaller left and right lateral and paralaminar nuclei, but with larger left and right central, medial, and cortical nuclei (p < .05, false discovery rate corrected). Shape analyses revealed lower radial distance in anterior bilateral amygdala and lower Jacobian determinant in posterior bilateral amygdala in PTSD compared with control subjects. Alterations in select amygdala subnuclear volumes and regional shape distortions are associated with PTSD in military veterans. Volume differences of the lateral nucleus and the centromedial complex associated with PTSD demonstrate a subregion-specific pattern that is consistent with their functional roles in fear learning and fear expression behaviors.
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