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IF45.8!南京大学医学院团队凭借“国自然”斩获《Science》顶刊!

  • 2026-03-27 02:10:32
IF45.8!南京大学医学院团队凭借“国自然”斩获《Science》顶刊!

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UC患者体内新发现的产气溶素气单胞菌变体可通过其毒素破坏巨噬细胞屏障、诱发结肠炎,而抗气溶素抗体有望成为干预新策略。

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文献导读

文章题目产生气溶蛋白的气单胞菌变异体会促进溃疡性结肠炎的易感性

发表期刊:Science

发表时间2025年11月20日

影响因子:IF=45.8

1

研究背景

溃疡性结肠炎(UC)是一种常见的炎症性肠病,但部分致病机制仍不明确。研究发现,UC患者尚未出现明显炎症的结肠区域存在巨噬细胞耗竭现象,提示细菌毒素可能在疾病早期起重要作用。

2

研究方法

本研究在UC患者中发现一种致病性气单胞菌变异体(MTB),其分泌的气溶素能介导巨噬细胞死亡并驱动结肠炎,且该菌在患者中携带率更高,提示其在疾病中的作用。

3

研究亮点

✅发现并鉴定了一种与UC相关的致病细菌新变体

✅揭示了UC发病的一种新机制——毒素介导的巨噬细胞屏障破坏

✅明确了aerolysin毒素在致病中的核心作用

✅提出了潜在的新型诊断标记物和治疗策略

研究结果

1

PPD-Qs的毒性预测与分析

图1显示,在UC患者的结肠组织中,上皮下巨噬细胞在形态完好的区域已显著减少,且巨噬细胞缺失先于明显上皮炎症;动物实验中,巨噬细胞耗损后小鼠对肠道刺激更敏感,易诱发结肠炎。

图1.溃疡性结肠炎(UC)患者结肠上皮固有巨噬细胞减少,且在动物模型中可导致对DSS的易感性

2

从UC患者粪便中分离出巨噬

细胞毒性细菌(MTB)

图2表明,从UC患者粪便中分离的细菌培养上清对巨噬细胞具有毒性,经纯化与质谱鉴定该毒素为 aerolysin;巨噬细胞对 aerolysin 的敏感性远高于上皮细胞;并鉴定出产生该毒素的 Aeromonas 变体 MTB。

图2.巨噬细胞对气单胞菌属MTB分泌的气溶素具有超敏反应

3

MTB在病理条件下定植小鼠

并诱导UC样结肠炎

图3证实,MTB 可在病理条件下持续定植于小鼠肠道,并导致结肠巨噬细胞减少,进而诱发类似UC的炎症表型;在 IL-10 缺陷小鼠中,MTB 单独即可引发结肠炎

图3.MTB给药诱导了溃疡性结肠炎样表型及免疫应答

4

气溶素是MTB诱导结肠炎的

必需因子

图4通过构建 aerolysin 缺陷株及回补实验,证明 aerolysin 是 MTB 引起巨噬细胞破坏和结肠炎所必需的毒素

图4.气溶素(Aerolysin)对结核分枝杆菌(MTB)诱导的巨噬细胞破坏及结肠炎具有不可或缺的作用

5

MTB和气溶素在UC患者

中高检出

图5检测显示,UC患者粪便中 Aeromonas 的检出率与相对丰度均显著高于健康对照和克罗恩病患者;在UC患者结肠组织中也可检测到 aerolysin 蛋白。

图5.溃疡性结肠炎粪便中分枝杆菌的存在及UC结肠组织中气溶素蛋白的检测

6

抗气溶素抗体可预防和治

疗MTB诱导的结肠炎

图6表明,预防性或治疗性使用抗 aerolysin 多克隆抗体或单克隆抗体,均可减轻 MTB 诱导的小鼠结肠炎,保护巨噬细胞屏障并降低炎症指标。

图6.抗气溶胶素抗体减轻MTB诱导的结肠炎

总结

MTB通过分泌气溶素介导巨噬细胞死亡,促进结肠炎发生;靶向气溶素的抗体可缓解小鼠模型病情,且UC患者气单胞菌检出率更高。该研究揭示了一种新的UC发病机制,并为治疗提供了潜在靶点。有需要的话可以戳我头像~

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  1. CONNECT:[ UseTime:0.000470s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000710s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000278s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000560s ]
  6. SELECT * FROM `set` [ RunTime:0.000255s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000600s ]
  8. SELECT * FROM `article` WHERE `id` = 487938 LIMIT 1 [ RunTime:0.000394s ]
  9. UPDATE `article` SET `lasttime` = 1775307920 WHERE `id` = 487938 [ RunTime:0.002291s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000279s ]
  11. SELECT * FROM `article` WHERE `id` < 487938 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000462s ]
  12. SELECT * FROM `article` WHERE `id` > 487938 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000414s ]
  13. SELECT * FROM `article` WHERE `id` < 487938 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002118s ]
  14. SELECT * FROM `article` WHERE `id` < 487938 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001174s ]
  15. SELECT * FROM `article` WHERE `id` < 487938 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001610s ]
0.104955s