当前位置:首页>南昌>临床数据+益生菌囊泡+肠脑轴发子刊!南昌大学聂少平Cell子刊:肠道益生菌派出“纳米囊泡”,跨越肠脑轴缓解阿尔兹海默症

临床数据+益生菌囊泡+肠脑轴发子刊!南昌大学聂少平Cell子刊:肠道益生菌派出“纳米囊泡”,跨越肠脑轴缓解阿尔兹海默症

  • 2026-05-08 08:52:48
临床数据+益生菌囊泡+肠脑轴发子刊!南昌大学聂少平Cell子刊:肠道益生菌派出“纳米囊泡”,跨越肠脑轴缓解阿尔兹海默症
大肠杆菌Nissle 1917通过含OmpA的外膜囊泡缓解小鼠阿尔茨海默病
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  • 阿尔茨海默病并不只是脑内 Aβ 沉积和神经元退变的问题,越来越多证据提示,肠道菌群失衡可能通过肠脑轴深度参与神经炎症和认知功能障碍。近日,南昌大学聂少平团队在 Cell Reports Medicine 发表研究,发现益生菌 E. coli Nissle 1917 可通过分泌富含 OmpA 的外膜囊泡进入脑内,重塑星形胶质细胞-小胶质细胞-神经元互作。该研究证明,EcN来源OMVs能够降低Aβ病理、缓解神经炎症、恢复突触功能并改善认知缺陷。更重要的是,这项工作将益生菌治疗从“调菌”推进到“后生元纳米囊泡精准调控肠脑轴”的新阶段。

    文/编辑|shanjie@ahmu 

    南昌大学聂少平教授报道的这项工作从益生菌生物材料角度看,这项工作的核心亮点不是简单证明“益生菌能改善阿尔茨海默病”,而是把益生菌 E. coli Nissle 1917(EcN) 分泌的外膜囊泡 OMVs 定义为一种天然“后生元纳米递送系统”,并进一步指出其中的 OmpA 蛋白 是决定其脑靶向和免疫调控功能的关键成分。

    这篇文章首先从临床样本出发,发现 AD 患者肠道中 EcN 样菌株水平降低,并且其丰度与认知能力呈正相关。随后作者在 APP/PS1 小鼠中证明,补充 EcN 可以降低 Aβ 沉积、缓解神经炎症并改善认知障碍;而当抑制 EcN 分泌 OMVs 后,这种保护作用明显减弱,说明 OMVs 是 EcN 发挥神经保护效应的重要功能载体。

    最有意思的是,作者进一步证明 EcN-OMVs 并不是只停留在肠道局部,而是可以进入血液循环,并最终到达脑组织,主要被神经元摄取,也可被小胶质细胞和星形胶质细胞摄取。进入脑内后,EcN-OMVs 能够重塑 星形胶质细胞-小胶质细胞-神经元 之间的异常互作,抑制胶质细胞过度激活,改善突触蛋白表达、树突棘密度和 LTP 功能,从而把“肠道菌群变化”与“脑内神经免疫稳态重建”连接起来。

    机制层面,文章通过 EcN ΔOmpA 突变株进一步证明,缺失 OmpA 后 OMVs 跨越生物屏障和缓解 AD 病理的能力明显下降;而游离 OmpA 静脉注射并不能复制完整 OMVs 的效果,说明 OmpA 需要依托 OMVs 的完整囊泡结构,才能实现稳定递送、靶向摄取和功能发挥。整体来看,这是一篇非常典型的益生菌来源外膜囊泡 + 肠脑轴 + 神经免疫调控 + AD治疗的高水平机制文章,也为“活菌治疗”向“后生元纳米囊泡治疗”转化提供了新的思路。

    相关研究以Escherichia coli Nissle 1917 alleviates Alzheimer’s disease in mice through OmpA-containing outer membrane vesicles发表在 Cell Reports Medicine上。

    1

    临床样本揭示AD相关肠道菌群失衡与EcN下降

    图1. AD患者肠道微生物群落不同于健康对照者

    2

    EcN-OMVs降低Aβ沉积并改善认知障碍

    图2. EcN通过分泌外膜囊泡缓解AD病理改变

    3

    益生菌纳米囊泡突破肠脑屏障并进入脑内细胞

    图3. EcN外膜囊泡在体内向脑组织转运

    4

    转录组揭示OMVs重塑神经免疫与突触功能程序

    图4. EcN外膜囊泡调控APP/PS1小鼠免疫与神经功能通路相关基因表达

    5

    恢复突触结构与LTP功能,改善神经网络可塑性

    图5. EcN外膜囊泡改善APP/PS1小鼠神经元功能

    6

    重塑星形胶质细胞-小胶质细胞-神经元互作

    图6. EcN外膜囊泡调控APP/PS1小鼠脑内免疫网络

    7

    OmpA决定OMVs脑靶向与神经保护效应

    图7. OmpA介导EcN外膜囊泡对AD病理的改善作用

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    1. CONNECT:[ UseTime:0.000639s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000938s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000360s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000265s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000545s ]
    6. SELECT * FROM `set` [ RunTime:0.000233s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000612s ]
    8. SELECT * FROM `article` WHERE `id` = 509165 LIMIT 1 [ RunTime:0.000472s ]
    9. UPDATE `article` SET `lasttime` = 1778435944 WHERE `id` = 509165 [ RunTime:0.016622s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.012465s ]
    11. SELECT * FROM `article` WHERE `id` < 509165 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.015238s ]
    12. SELECT * FROM `article` WHERE `id` > 509165 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010181s ]
    13. SELECT * FROM `article` WHERE `id` < 509165 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006046s ]
    14. SELECT * FROM `article` WHERE `id` < 509165 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004042s ]
    15. SELECT * FROM `article` WHERE `id` < 509165 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002892s ]
    0.144886s