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南京鼓楼医院徐标团队:肠-心轴新视角,细菌胞外囊泡移位加重心肌损伤 | 热心肠日报

  • 2026-04-17 12:36:13
南京鼓楼医院徐标团队:肠-心轴新视角,细菌胞外囊泡移位加重心肌损伤 | 热心肠日报
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本文要点

IF: 11
Invasion of gut-derived escherichia coli extracellular vesicles exacerbates myocardial ischemia/reperfusion injury
Junzhuo WangKe Hu
He LuKe ChenJian ZhangShaojun Wu
康丽娜谢峻徐标
Article|2026-02-28|OA
10.1080/19490976.2026.2635818

背景与设计

针对肠道菌群调节心肌缺血/再灌注(I/R)损伤机制不明的问题,结合小鼠模型及患者样本,鉴定了肠道细菌胞外囊泡(EVs)在肠-心轴中的媒介作用。

核心发现与意义

心肌I/R损伤导致肠道屏障破坏,促使肠道来源的大肠杆菌EVs携LPS跨屏障入侵,加剧全身及心脏局部炎症,恶化心脏修复,强化肠道屏障是防治心脏损伤的新策略。

EVs转位与载体作用

报告小鼠证实,心肌I/R后肠道屏障受损,大肠杆菌EVs可转位至循环和心脏组织;患者和小鼠数据显示外周血OmpA/C+ EVs水平与LPS浓度正相关,表明EVs是LPS转位的关键载体。

促炎效应与心脏损伤

口服大肠杆菌EVs加剧了I/R小鼠全身及心脏内中性粒细胞和Ly6Chigh促炎单核/巨噬细胞的募集与极化,并上调IL-1β等炎性因子,导致梗死面积扩大、心功能恶化及纤维化加重。

干预效果

使用胰高血糖素样肽-2增强肠道屏障功能,可抑制大肠杆菌EVs转位,减少促炎细胞浸润,提升心肌修复改善心功能。

核心关键词

肠道菌群大肠杆菌细胞外囊泡心肌缺血再灌注损伤肠道屏障脂多糖胰高血糖素样肽-2肠-心轴炎症

科普解读

一份发表在Gut Microbes的研究论文揭示,在心肌缺血再灌注损伤后,来自肠道细菌——尤其是大肠杆菌——分泌的细胞外囊泡会突破受损的肠道屏障,携带脂多糖等有害物质进入循环系统与心脏,显著加剧炎症反应,恶化心脏功能。

这一发现来自南京鼓楼医院的徐标、谢峻、康丽娜团队。该研究不仅首次揭示了肠道菌群来源的囊泡在心肌损伤中的关键角色,还发现胰高血糖素样肽-2可以通过加固肠道屏障来阻断这一有害过程,为心肌梗死后的治疗提供了新思路。

肠道屏障失守,心脏迎来不速之客

当心脏因心肌梗死缺血,又在血管再通后恢复血流时,会遭受“缺血再灌注损伤”。南京鼓楼医院团队发现,这种损伤并非局限于心脏。心肌的缺血会引发肠道供血不足,导致肠道屏障的紧密连接蛋白(如Claudin-1)表达下降,肠道通透性增加。团队观察到,小鼠在心梗后的肠道组织损伤评分显著升高。

借助巧妙的遗传学追踪技术,团队发现,肠道内的大肠杆菌来源的囊泡,正是在这个屏障受损的窗口期“溜”了出去。研究人员给肠道菌群被清除的小鼠灌饲了一种能表达Cre重组酶的特殊大肠杆菌,同时使用一种报告基因小鼠。当这种囊泡被宿主细胞摄取后,Cre酶会激活红色荧光报告基因的表达。结果显示,在心肌损伤后,小鼠外周血和心脏组织中确实出现了大量携带红色荧光的细胞,证明囊泡实现了“肠-心”迁移。

囊泡化身炎症“特洛伊木马”

这些穿越屏障的细菌囊泡为何如此关键?研究指出,大肠杆菌囊泡表面富含OmpC、OmpA等外膜蛋白,内部则装载了LPS等病原相关分子模式。在临床上,急性心肌梗死患者的血液中也发现了更高水平的OmpC阳性囊泡

重要的是,这些OmpC囊泡的水平与患者血液中的脂多糖浓度呈正相关,更与心肌损伤标志物肌红蛋白和肌钙蛋白T的水平同步升高。这意味着,这些来自肠道的囊泡很可能是脂多糖进入循环系统并加剧全身性炎症的重要载体。它们是炎症的“特洛伊木马”。

加剧的炎症与恶化的心脏

一旦这些装载LPS的囊泡进入循环并抵达心脏,它们便开启了“煽风点火”的模式。团队发现,给予小鼠口服大肠杆菌囊泡后,其外周血和心脏组织中的中性粒细胞数量显著增加,单核/巨噬细胞也更倾向于分化为促炎的Ly6Chigh亚型。血液中促炎因子白细胞介素-1、白细胞介素-6和肿瘤坏死因子-α的浓度也随之升高。

这种过度的炎症风暴直接加重了心脏损伤。动物实验证实,接受大肠杆菌囊泡干预的小鼠,在心肌损伤后心脏射血分数下降更严重,梗死面积扩大了近四分之一,心脏纤维化程度也显著加深。相比之下,来源于益生菌植物乳杆菌的囊泡则未观察到类似的促炎效应。

干预肠屏障,为心脏赢得生机

既然问题源于肠道屏障的漏洞,那么修复屏障能否阻断伤害?团队将目光投向了能够增强肠道屏障功能的胰高血糖素样肽-2。在给予肠道定植了特殊大肠杆菌的小鼠使用GLP-2后,研究人员惊喜地发现,心脏和外周血中由囊泡诱导的红色荧光信号显著减少

GLP-2通过提升肠道紧密连接蛋白表达、降低肠道通透性,有效阻止了细菌囊泡的“外逃”。随之而来的,是炎症反应的显著缓解:促炎的单核/巨噬细胞亚群和中性粒细胞的募集减少,梗死区域的炎症浸润被抑制。最终,这带来了心脏功能的改善纤维化程度的减轻

这项研究首次系统性揭示了肠道细菌囊泡在心肌缺血再灌注损伤中的有害作用,并明确了其作用路径:损伤导致肠道屏障破坏 → 大肠杆菌囊泡携LPS等物质入血 → 加剧系统性与局部心脏炎症 → 恶化心脏损伤与功能。通过GLP-2靶向肠道屏障的干预策略,为未来开发保护心脏的新疗法提供了全新视角。

图片摘要

图片由AI生成,可能有错,请谨慎辨别。

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  1. CONNECT:[ UseTime:0.001111s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000893s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000315s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000291s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000615s ]
  8. SELECT * FROM `article` WHERE `id` = 497468 LIMIT 1 [ RunTime:0.000510s ]
  9. UPDATE `article` SET `lasttime` = 1776849570 WHERE `id` = 497468 [ RunTime:0.000597s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000221s ]
  11. SELECT * FROM `article` WHERE `id` < 497468 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000461s ]
  12. SELECT * FROM `article` WHERE `id` > 497468 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000493s ]
  13. SELECT * FROM `article` WHERE `id` < 497468 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000660s ]
  14. SELECT * FROM `article` WHERE `id` < 497468 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000616s ]
  15. SELECT * FROM `article` WHERE `id` < 497468 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000889s ]
0.154148s