创伤后应激障碍（PTSD）是创伤事件后高发的精神障碍，恐惧记忆异常提取是其核心病理特征，而海马星形胶质细胞功能紊乱在其中扮演关键角色。近期发表于MedComm的高分研究系统揭示海马星形胶质细胞 PGC-1α 缺失通过 PGC-1α/CX43 轴介导 ATP 释放异常，导致恐惧记忆增强，为 PTSD 靶向治疗提供全新靶点。

本研究中，爱必信（Absin）组织解离液（abs9482） 作为关键实验试剂，为高纯度星形胶质细胞分选与机制验证提供核心支撑，助力科研团队突破关键技术瓶颈。

一、研究背景：PTSD 机制研究的 "胶质细胞新视角"

PTSD 核心表现为创伤线索触发的恐惧记忆过度提取、泛化与消退障碍，既往研究多聚焦神经元环路，而星形胶质细胞作为中枢数量最多的胶质细胞，调控神经通讯、突触可塑性与能量代谢，其在 PTSD 中的作用被严重低估。

PGC-1α 是能量代谢与线粒体生成核心调控因子，临床 PTSD 患者脑内 PGC-1α 显著下调，但其在海马星形胶质细胞中调控恐惧记忆的分子机制尚不明确。本研究以单一长时间应激（SPS）PTSD 小鼠模型为对象，解析星形胶质细胞 PGC-1α 的作用通路。

二、研究思路：从表型到机制，层层递进破解 PTSD 密码

研究采用六步法逻辑，完整构建 "表型 — 分子 — 干预" 的证据链：

1. 定位关键细胞：验证 SPS 模型中海马星形胶质细胞结构与功能异常（图 1）；

FIGURE 1.
The involvement of hippocampal ASTs in SPS‐induced PTSD‐like behaviors. (A) Analysis of the functional connectivity network characteristics of the hippocampus; (B) scanning each sampling volume (corresponding to four slices) in the height direction of 1.6 mm within 2.2 s; (C) brain regions with mean values from both groups and where there was a difference in functional connectivity (filtering condition: difference p < 0.05, correlation ecoefficiency > 0.15) (n = 3/group); (D) regional functional intensity (absolute difference between the average values of control group and model group mice); the involved brain regions include dentate gyrus (DG), thalamus (Tha), olfactory areas (Olf), perirhinal area (Per), striatum dorsal region (DS), visceral area (Vis), field CA1 (CA1), striatum‐like amygdalar nuclei (Str‐amy), hippocampal region (Hip), primary somatosensory area (SI), hypothalamic medial zone (Hyp), retrohippocampal region (Retro‐Hip), pallidum, dorsal region (Dor), primary somatosensory area (Pos), retrosplenial area (Rsp), perirhinal area (Per), hypothalamic lateral zone (Hyp), supplemental somatosensory area (SMA), agranular insular area (Agr), posterior parietal association area (Pos), temporal association areas (Tem), auditory areas (Aud); (E) diagram showing the number of astrocytes in local brain regions of mice; (F) statistical analysis of the differences in the number of astrocytes in various brain regions; (G) representative images of S100A10 immunofluorescence staining in the CA1 regions of the control group and SPS group (scale bar: 50 µm); (H) percentage of colabeling of S100A10 and GFAP in the control group and SPS group (n = 3/group); (I) statistical values of the average fluorescence intensity of S100A10 in the control group and SPS group. Data are presented as mean and SEM. *p < 0.05 between groups (t‐test).

2. 监测动态信号：实时记录恐惧提取期星形胶质细胞 Ca²⁺信号与 ATP 释放（图 2）；

FIGURE 2.
Hippocampal AST calcium signals and ATP release were reduced during fear memory retrieval in PTSD model mice. (A) Flowchart of the experiment (n = 8/group); (B) representative graph of GcaMP6f‐labeled ASTs; (C) representative graph of the calcium signal changes in the hippocampus of mice during the contextual fear test; (D) difference graph of the calcium transient AUC of ASTs; (E) quantitative data of the calcium transient AUC of AST; (F) peak number of calcium signal releases in the contextual fear test of mice; (G) freezing time of mice in the contextual fear test; (H) correlation analysis between the peak number of calcium signal and the freezing time of mice; (I) flowchart of the experiment (n = 6/group) and representative graph of ATP fluorescent probe virus‐labeled AST; (J) representative graph of the ATP fluorescence signal changes in the hippocampus of mice during the contextual fear test; (K) difference graph of ATP fluorescence signal AUC; (L) quantitative data of ATP fluorescence signal AUC; (M) peak mean of ATP fluorescence signal release; (N) peak number of ATP fluorescence signal releases; (O) freezing time of mice in the contextual fear test. Data are presented as mean and SEM. *p < 0.05, **p < 0.01, ***p < 0.001 between groups (t‐test).

3. 锁定核心轴：发现 SPS 小鼠星形胶质细胞PGC-1α/CX43 轴显著下调（图 3）；

FIGURE 3.
Reduction of AST PGC‐1α–CX43 axis in SPS mice was responsible for the enhanced fear retrieval. (A) Experimental steps of FACS (n = 3/group); (B) gate strategy and sorting results; (C) representative bands and quantitative data of PGC‐1α and NRF1 proteins; (D) representative bands and quantitative data of hippocampal CX43 protein in the control group and on Days 1, 7, and 14 after SPS modeling; (E) flowchart of the experiment (n = 6/group); (F and G) freezing time of Con+CSF and Con+GAP27 group mice in the contextual fear test (F) and the cued fear test (G); (H) ELISA for detecting the ATP levels in the hippocampal tissues of the mice in the Con+CSF and Con+GAP27 groups; (I) ELISA for detecting the ATP levels in the hippocampal tissues of the mice in the control and SPS groups. Data are presented as mean and SEM. *p < 0.05, ***p < 0.001 between groups (t‐test or Tukey test).

4. 功能验证：星形胶质细胞特异性敲低 PGC-1α 模拟 PTSD 恐惧表型（图 4–6）；

FIGURE 4.
AST PGC‐1α knockdown enhanced fear memory and anxiety‐like behaviors and impaired AST structure. (A) Flowchart of the experiment (n = 9/group); (B) representative images of virus‐labeled astrocytes; (C) representative bands and quantitative data of PGC‐1α and CX43; (D) freezing of mice in the contextual fear test; (E) freezing of mice in the cued fear test; (F) the percentage of time that mice spent exploring the open arm in the elevated maze test out of the total time; (G and H) the total distance and representative traces of the open field test; (I and J) the results and representative images of the Sholl analysis of astrocytes. The data are presented as mean ± standard error (n = 3/group). (K) Representative image of S100A10 immunofluorescence staining (scale bar: 50 µm); (L) the percentage of colabeling of S100A10 and PGC‐1α (n = 3/group). Data are presented as mean and SEM. *p < 0.05, **p < 0.01, ***p < 0.001 between groups (t‐test).

FIGURE 5.
AST PGC‐1α knockdown impaired hippocampal neuronal activity. (A) Flowchart of the experiment; (B) representative images showing the colocalization of the fluorescence of the PGC‐1α knockdown virus (green) with the immunofluorescence of the AST marker GFAP (red) and the electrode implantation location (scale bar: 50 µm); (C–E) mean frequency (C), bursts per minute (D), and AI value (E) of mouse hippocampal neurons recorded by multichannel electrodes during the conditioned fear test (n = 5/group); (F) grating diagram of mouse hippocampal neurons spike; (G) schematic of the patch‐clamp experiment (n = 5/group); (H) original current representation of action potential; (I) statistical data of action potential; (J) original current representation of spontaneous excitatory postsynaptic current; (K) frequency of spontaneous excitatory postsynaptic current; (L) amplitude of spontaneous excitatory postsynaptic current. Data are presented as mean and SEM. *p < 0.05, **p < 0.01 between groups (t‐test).

5. 机制深挖：PGC-1α 缺失抑制 CX43、减少 ATP 释放、损伤海马神经元活性（图 5–6）；

FIGURE 6.
AST PGC‐1α knockdown prohibited the release of extracellular ATP. (A) Flowchart of the experiment (n = 4/group); (B) representative images of virus‐labeled astrocytes (scale bar: 50 µm); (C) representative graphs and quantitative data of the area under curve (AUC) of ATP fluorescence signal during the first training period; (D and E) representative graphs showing the changes in ATP levels in the two groups of mice during the contextual fear memory (D) and cued fear memory (E) tests; (F) representative graphs and heat maps of the AUC of ATP levels during the contextual fear memory test; (G) quantitative data of the AUC of ATP levels during the contextual fear memory test; (H and I) peak values (H) and frequencies (I) of ATP release during the contextual fear memory test; (J) representative graph and heatmap of the AUC of ATP levels in the two groups of mice during the fear memory test; (K) quantitative data of the AUC of ATP levels during the fear memory test; (L and M) peak values (L) and frequency (M) of ATP release during the fear memory test. Data are presented as mean and SEM. *p < 0.05 between groups (t‐test).

6. 干预验证：激活星形胶质细胞或 PGC-1α 可逆转 PTSD 样行为（图 7）。

FIGURE 7.
Activation of hippocampal AST or PGC‐1α reduced fear memory retrieval in SPS mice. (A) Flowchart of experiment 5 (n = 7/group); (B) representative image of immunofluorescence of hM3Dq‐labeled AST; (C) freezing time of mice in the contextual fear test; (D) freezing time of mice in the cued fear test; (E) percentage of time that mice spent exploring the open arm in the elevated maze test out of the total time; (F) flowchart of the experiment 5 (n = 6/group); (G) freezing time of mice in the contextual fear memory; (H) freezing time of mice in the cued fear memory; (I) percentage of time that mice spent exploring the open arm in the elevated maze test out of the total time; (J and K) representative bands of GFAP (J) and CX43 (K) along with quantitative data; (L) flowchart of the experiment 6 (n = 7/group); (M) schematic diagram of the hM3Dq–mCherry/AAV5–PGC‐1α viral injection site and colabeling; (N) freezing time of mice in the contextual fear memory; (O) freezing time of mice in the cued fear memory. Data are presented as mean and SEM. *p < 0.05, **p < 0.01, ***p < 0.001 between groups (t‐test or Tukey test).

三、核心成果：PGC-1α/CX43/ATP 通路是 PTSD 治疗新靶点

1. 海马星形胶质细胞是 PTSD 关键靶细胞（原文图 1）

• SPS 模型小鼠海马与丘脑、下丘脑功能连接减弱，与杏仁核连接异常增强；
• 海马 GFAP 阳性星形胶质细胞数量显著减少，S100A10（神经保护型 A2 星形胶质细胞标志物）表达降低，提示星形胶质细胞萎缩与功能耗竭是 PTSD 重要病理改变。

2. 恐惧提取期星形胶质细胞 Ca²⁺与 ATP 信号双重缺陷（原文图 2）

• 光纤记录显示：SPS 小鼠恐惧提取时，海马星形胶质细胞 Ca²⁺信号峰值减少、ATP 释放量与频率显著降低；
• Ca²⁺信号峰值与僵住时间呈显著负相关，星形胶质细胞信号缺陷直接驱动恐惧记忆增强。

3. PGC-1α/CX43 轴下调是核心分子机制（原文图 3）

• 流式分选高纯度星形胶质细胞证实：SPS 小鼠星形胶质细胞 PGC-1α 及下游 NRF1 显著下调；
• 海马 CX43（星形胶质细胞主要间隙连接蛋白）表达降低，阻断 CX43 可模拟恐惧增强表型并降低 ATP 水平；
• 明确PGC-1α 通过调控CX43 控制 ATP 释放，维持正常恐惧记忆。

4. 星形胶质细胞 PGC-1α 缺失足以诱发 PTSD 样行为（原文图 4–6）

• 海马星形胶质细胞特异性敲低 PGC-1α：恐惧记忆显著增强、焦虑样行为增加；
• 星形胶质细胞分支减少、A2 型标志物降低，海马神经元放电频率与 sEPSC 频率下降；
• 直接证明PGC-1α 缺失是恐惧记忆异常的充分条件。

5. 激活 PGC-1α 或星形胶质细胞可逆转 PTSD 表型（原文图 7）

• 化学遗传学激活海马星形胶质细胞、PGC-1α 激动剂（ZLN005、白藜芦醇）均能：
✅ 降低恐惧记忆僵住时间；✅ 恢复 CX43 与 GFAP 表达；✅ 改善焦虑样行为；
• 同时敲低 PGC-1α 可阻断星形胶质细胞激活的治疗效应，PGC-1α 是干预必需靶点。

四、Absin abs9482：解锁星形胶质细胞机制的 "关键钥匙"

本研究流式细胞分选高纯度海马星形胶质细胞（原文图 3A–B）是机制验证的核心步骤，而Absin 组织解离液（abs9482） 是该步骤的核心试剂，发挥不可替代作用：

实验方法原文描述：为将小鼠海马组织解离为单细胞，按比例加入 abs9482 组织解离液，制备单细胞悬液后进行流式分选（对应原文图 3A）。

五、研究意义与转化前景

本研究首次证实：
海马星形胶质细胞 PGC-1α 缺失→CX43 下调→ATP 释放减少→神经元功能异常→恐惧记忆过度提取，构成 PTSD 核心病理轴；
提出星形胶质细胞靶向（激活 PGC-1α/CX43 轴）是 PTSD 防治全新策略，为药物研发提供精准靶点。

Absin abs9482 以高活性、高适配性、高稳定性，助力神经科学与精神疾病领域突破，是胶质细胞研究、单细胞分选、类器官构建的优选试剂。