当前位置:首页>南京>南京第一医院:IL-34/TREM2在散发性阿尔茨海默病小鼠模型中提供神经保护

南京第一医院:IL-34/TREM2在散发性阿尔茨海默病小鼠模型中提供神经保护

  • 2026-03-31 05:07:56
南京第一医院:IL-34/TREM2在散发性阿尔茨海默病小鼠模型中提供神经保护

关键词:阿尔茨海默病, IL-34, 小胶质细胞, 神经炎症, NLRP3, TREM2

keyword: Alzheimer's, IL-34, microglia, neuroinflammation, NLRP3, TREM2

期刊名:《Journal of Alzheimer's Disease》影响因子(IF):3.1,分区(JCR):Q2

标题:IL-34/TREM2 modulates microglia-mediated inflammation and provides neuroprotection in a mouse model of sporadic Alzheimer's disease(IL-34/TREM2调节小胶质细胞介导的炎症并在散发性阿尔茨海默病小鼠模型中提供神经保护)

第一作者及单位:Shi-Yao Wang(南京医科大学南京第一医院神经内科), Zhi-Hang Huang(南京医科大学南京第一医院神经内科)等

发表时间:2025年

主要结论概要:本研究发现,在散发性AD模型SAMP8小鼠中,脑IL-34浓度随疾病进展逐渐下降;IL-34输注能通过TREM2相互作用抑制小胶质细胞NLRP3炎症小体激活,改善认知功能、神经元损伤和神经炎症,提示IL-34/TREM2信号通路可作为AD治疗新靶点。

研究背景与目的

阿尔茨海默病(AD)是常见的神经退行性疾病,发病机制复杂,缺乏有效治疗手段。细胞因子IL-34主要由神经元产生,既往研究提示其具有神经保护作用,但具体机制不明。本研究旨在探讨IL-34在散发性AD模型中的动态变化及其通过调控小胶质细胞功能发挥神经保护的分子通路。

实验设计与方法

研究采用SAMP8小鼠(散发性AD经典模型)和年龄匹配的SAMR1对照鼠。通过ELISA检测不同月龄(4、8、12个月)小鼠脑内IL-34浓度变化,并对8月龄SAMP8小鼠进行连续4周脑室内IL-34输注。行为学测试(Morris水迷宫)评估空间认知功能;Western blot分析神经元标志物(NeuN)、突触蛋白(SYP、PSD-95)、氧化应激指标(MDA、SOD)及炎症因子(IL-1β、IL-6、TNF-α);体外实验使用Aβ42刺激原代小胶质细胞,结合TREM2基因敲低和Co-IP技术验证机制。

IL-34浓度动态变化

结果显示,SAMP8小鼠脑内IL-34浓度随AD进展显著降低(图1-A),而SAMR1对照鼠无此变化;IL-34输注成功提升脑内浓度(图1-B),证实其与疾病进程相关。这一发现与既往APP/PS1转基因模型研究一致[2],提示IL-34缺乏可能参与AD病理。

认知功能改善证据

Morris水迷宫测试中,SAMP8小鼠表现出血清学习记忆缺陷,路径长度延长,目标象限停留时间减少;IL-34输注后,小鼠认知功能明显改善,路径缩短(图2-B),探测试验中目标象限偏好恢复(图2-C),游泳速度无差异(图2-A),表明IL-34特异性缓解AD相关空间认知损伤。

神经元与突触保护

Western blot分析显示,SAMP8小鼠脑内NeuN、SYP和PSD-95蛋白水平下降,提示神经元和突触损伤;IL-34输注后这些标志物显著回升(图3-A至D),与Mizuno等研究一致[2],表明IL-34能直接保护神经结构完整性。

氧化应激与炎症抑制

SAMP8小鼠脑内氧化应激标志物MDA升高,抗氧化酶SOD活性降低;同时促炎因子(IL-1β、IL-6、TNF-α)及小胶质细胞标志物Iba-1、星形胶质细胞标志物GFAP上调。IL-34输注逆转这些变化(图4-A至H),选择性降低Iba-1水平,突出其通过抑制小胶质细胞激活缓解神经炎症的核心作用。

分子机制深度解析

体外实验中,Aβ42刺激原代小胶质细胞导致NLRP3炎症小体激活和促炎因子释放;IL-34预处理抑制这一过程(图5-A至E)。通过TREM2敲低实验,发现IL-34的抗炎作用依赖TREM2(图5-F),Co-IP证实两者直接结合,首次揭示IL-34/TREM2轴调控NLRP3通路的新机制。

研究局限与前景

本研究使用SAMP8小鼠,虽模拟散发性AD特征,但缺乏典型Aβ斑块和tau缠结;未来需在3xTg-AD等模型验证。此外,TREM2作用可能随疾病阶段变化[3],但整体数据支持IL-34/TREM2信号在AD早期具有抗炎和神经保护潜力,为药物开发提供新方向。

o, T. et al. “Interleukin-34 selectively enhances the neuroprotective effects of microglia to attenuate oligomeric amyloid-β neurotoxicity.” American Journal of Pathology vol. 179,4 (2011): 2016-2027. doi:10.1016/j.ajpath.2011.07.004

[3] Ho, A. et al. “IL-34 exacerbates pathogenic features of Alzheimer's disease and calvaria osteolysis in triple transgenic (3x-Tg) female mice.” Biomedicine & Pharmacotherapy vol. 166 (2023): 115435. doi:10.1016/j.biopha.2023.115435

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  1. CONNECT:[ UseTime:0.000494s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000697s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004744s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000316s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000543s ]
  6. SELECT * FROM `set` [ RunTime:0.000204s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000515s ]
  8. SELECT * FROM `article` WHERE `id` = 483120 LIMIT 1 [ RunTime:0.000419s ]
  9. UPDATE `article` SET `lasttime` = 1775376277 WHERE `id` = 483120 [ RunTime:0.015496s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000360s ]
  11. SELECT * FROM `article` WHERE `id` < 483120 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002202s ]
  12. SELECT * FROM `article` WHERE `id` > 483120 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001557s ]
  13. SELECT * FROM `article` WHERE `id` < 483120 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001508s ]
  14. SELECT * FROM `article` WHERE `id` < 483120 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000745s ]
  15. SELECT * FROM `article` WHERE `id` < 483120 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000682s ]
0.126261s