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Nat Commun | 南昌大学潘秉兴/张文华团队揭示PTSD延迟回避的环路特异性分子机制

  • 2026-04-19 06:08:30
Nat Commun | 南昌大学潘秉兴/张文华团队揭示PTSD延迟回避的环路特异性分子机制

创伤后应激障碍(PTSD是极端创伤暴露后高发的精神疾病,全球普通人群患病率约6%-8%,过度回避是其核心症状之一,严重影响患者社会功能与生活质量。临床中大量患者呈现症状延迟发作特征——创伤暴露后数天至数周才出现明显回避行为,这一现象的神经环路与分子机制长期未被阐明,成为PTSD精准干预的关键瓶颈。

基底外侧杏仁核(BLA是情绪加工核心脑区,其投射神经元具有高度异质性,其中BLA→腹侧海马(vHPC)与BLA→伏隔核(NAc)两条通路分别参与厌恶与奖赏相关行为调控。同时,下丘脑-垂体-肾上腺(HPA)轴异常、皮质酮(CORT-糖皮质激素受体(GR)信号紊乱是PTSD重要病理特征,但该信号如何特异性调控BLA特定投射通路、驱动延迟回避行为,仍缺乏明确答案。血清/糖皮质激素调控激酶1Sgk1)作为GR下游关键分子,与精神疾病发病密切相关,但其在PTSD延迟回避中的作用尚未可知。

近日,南昌大学潘秉兴/张文华团队在Nature Communications上发表题为“Sgk1 upregulation in hippocampus-projecting amygdala neurons underlies the delayed onset of PTSD-like avoidance behavior”的研究性论文。本研究利用不可逃避足底电击构建PTSD小鼠模型,揭示创伤应激通过CORT-GR 信号通路,特异性上调基底外侧杏仁核腹侧海马(BLA→vHPC)投射神经元中Sgk1表达,增强该神经元兴奋性与兴奋性突触传递,最终介导PTSD样回避行为的延迟发作。这一发现阐明了PTSD延迟回避的环路特异性分子机制,为PTSD治疗提供全新潜在靶点。

01

足底电击应激诱导小鼠延迟且持久的PTSD样回避行为

研究团队通过梯度强度与时长的足底电击筛选,确定0.5 mA、连续 天的电击范式可稳定诱导雌雄小鼠出现延迟回避行为:应激后1天无明显异常,天起在旷场、高架十字迷宫中表现出显著回避,且行为可持续至14天;同时小鼠创伤相关情境恐惧记忆增强,运动能力不受影响。该模型完美模拟了临床PTSD回避行为延迟发作、长期持续的核心特征。

02

应激特异性增强BLA→vHPC投射神经元活性,而非BLA→NAc通路

借助光纤、c-Fos染色等技术,团队发现应激后BLA神经元活性呈延迟升高趋势,仅在 天出现钙信号与c-Fos表达上调,与回避行为时间高度耦合。进一步靶向记录两条关键投射通路发现,该活性增强具有高度投射特异性:BLA→vHPC神经元钙信号、c-Fos比例显著升高,BLA→NAc神经元无明显变化,证实BLA→vHPC通路是介导延迟回避的核心环路。

03

BLA→vHPC神经元内在兴奋性与兴奋性突触传递选择性增强

电生理实验显示,应激后 7 天,BLA→vHPC 神经元动作电位发放频率、输入电阻显著升高,微型兴奋性突触后电流(mEPSC)频率增加,而抑制性突触传递无改变;BLA→NAc神经元的电生理特性未受应激影响。说明应激通过选择性增强BLA→vHPC神经元兴奋性与兴奋性输入,实现该通路的特异性激活。

04

化学遗传抑制BLA→vHPC神经元缓解延迟回避行为

为验证因果关系,研究采用抑制性DREADDs系统特异性沉默BLA→vHPC神经元,给予CNO后,应激小鼠在旷场中心停留时间、高架开臂进入次数与停留时间显著增加,回避行为明显缓解。直接证明BLA→vHPC 神经元过度激活是延迟回避行为的充分必要条件。

05

CORT-GR信号是应激诱导延迟回避与神经元异常激活的核心上游通路

应激后小鼠血清皮质酮仅在 1 小时出现短暂飙升,随后快速恢复正常;提前给予皮质酮合成抑制剂美替拉酮、GR拮抗剂米非司酮,均可阻断延迟回避行为与BLA→vHPC神经元异常激活,而盐皮质激素受体(MR)拮抗剂无此作用。局部BLA核团注射米非司酮同样有效,且该机制在雌雄小鼠中保守,证实BLA局部CORT-GR信号是关键调控环节。

06

Sgk1GR下游介导该效应的特异性关键分子

团队筛选GR通路下游分子发现,应激不改变GRMR等基因表达,仅特异性上调BLA→vHPC神经元中Sgk1mRNA与蛋白水平,BLA→NAc神经元中Sgk1无变化。功能实验显示,BLA→vHPC神经元中过表达显性负性Sgk1Sgk1-DN),可完全阻断应激诱导的回避行为、神经元钙信号升高、电生理异常;而单独过表达Sgk1不足以诱发回避,但可显著降低小鼠应激易感性,使阈下应激即可触发回避行为与神经元异常激活。

07

总结

本研究系统阐明了PTSD样延迟回避行为的神经环路-分子调控轴:创伤应激引发短暂皮质酮飙升,通过BLA局部GR信号,特异性上调BLA→vHPC投射神经元中Sgk1表达,进而增强该神经元内在兴奋性与兴奋性突触传递,最终导致神经元延迟过度激活,诱发PTSD样回避行为。该发现首次揭示了Sgk1PTSD延迟回避中的环路特异性作用,为PTSD的精准靶向治疗提供了全新分子靶点与理论依据。

文献来源:https://doi.org/10.1038/s41467-026-71129-0
END

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  1. CONNECT:[ UseTime:0.000705s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000921s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000348s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000326s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000507s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000568s ]
  8. SELECT * FROM `article` WHERE `id` = 496855 LIMIT 1 [ RunTime:0.000655s ]
  9. UPDATE `article` SET `lasttime` = 1776794030 WHERE `id` = 496855 [ RunTime:0.000942s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000232s ]
  11. SELECT * FROM `article` WHERE `id` < 496855 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000435s ]
  12. SELECT * FROM `article` WHERE `id` > 496855 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000363s ]
  13. SELECT * FROM `article` WHERE `id` < 496855 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001733s ]
  14. SELECT * FROM `article` WHERE `id` < 496855 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001011s ]
  15. SELECT * FROM `article` WHERE `id` < 496855 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000758s ]
0.100554s