当前位置:首页>南京>IF 45.8!恭喜南京大学医学院“国自然”重点项目登顶《Science》!首揭溃疡性结肠炎发病新路径!

IF 45.8!恭喜南京大学医学院“国自然”重点项目登顶《Science》!首揭溃疡性结肠炎发病新路径!

  • 2026-03-26 17:16:14
IF 45.8!恭喜南京大学医学院“国自然”重点项目登顶《Science》!首揭溃疡性结肠炎发病新路径!
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📍溃疡性结肠炎为何迁延难愈🤔?

📍南京大学医学院《Science》研究揭示全新机制:

三重新发现:

1️⃣ 新病原:鉴定出一种与溃疡性结肠炎强相关产气溶素气单胞菌变体MTB

2️⃣ 新机制:通过免疫组化流式细胞术分析,突破传统 “上皮中心论” ,首次提出 “巨噬细胞屏障率先崩溃” 的疾病新模型。

3️⃣ 新靶点气溶素毒素成为可精准干预的治疗靶点

该研究系统阐明了溃疡性结肠炎中 “细菌毒素→免疫屏障破坏→炎症发生” 的级联机制,为开发靶向气溶素毒素的新型疗法提供了明确方向👏!

文献解读
研究背景

溃疡性结肠炎(UC)是一种严重影响患者生活质量的慢性炎症性肠病,全球患者达500万至1000万,尽管UC被认为是多因素疾病,但其确切病因长期不明,现有治疗只能控制炎症而无法根治肠道上皮屏障破坏是UC的显著特征,但启动这一破坏的“起始事件”一直是未解之谜-2

研究目的

本研究旨在揭示溃疡性结肠炎发病的“起始事件”,探究是否存在特定微生物通过破坏肠道免疫屏障而诱发肠炎,并鉴定关键致病因子,为UC的诊断和治疗提供新靶点

研究方法

本研究旨在揭示溃疡性结肠炎发病的“起始事件”,探究是否存在特定微生物通过破坏肠道免疫屏障而诱发肠炎,并鉴定关键致病因子,为UC的诊断和治疗提供新靶点建立巨噬细胞毒性筛选模型,从UC患者粪菌中分离鉴定出产气溶素的气单胞菌新变种MTB通过构建气溶素基因缺陷菌株、动物模型(野生型及IL-10缺陷小鼠)及抗气溶素抗体干预实验,验证MTB及其气溶素通过选择性破坏巨噬细胞屏障诱发UC的机制

研究结果

巨噬细胞早于炎症缺失:对比UC患者健康人的结肠组织,研究者发现一个关键现象:在那些尚未发生炎症的区域,紧贴肠上皮下方的组织常驻巨噬细胞已出现显著减少【图1A-C】。这种免疫 “哨兵”的缺失,发生于任何可见的上皮损伤和炎症细胞浸润之前【图1D-G】。这一现象提示,结肠炎的始动因素可能并非肠壁本身,而是其下方的免疫防线率先崩解

UC粪便产巨噬细胞毒:

研究者据此推测,可能是肠道菌群中某种细菌分泌的毒素,直接导致了巨噬细胞的选择性死亡

通过对大量粪便样本的系统筛查发现,近半数UC患者来源的细菌培养物能够高效杀伤巨噬细胞,而健康对照则无此作用。

质谱分析进一步精准锁定其毒性成分为气溶素——一种由气单胞菌属细菌分泌的成孔毒素【图2C-D】。

气溶素靶杀巨噬细胞:

纯化的气溶素作用于小鼠肠道后发现,它能够特异性清除上皮下层的巨噬细胞,而肠上皮细胞几乎不受影响【图2F-G】。体外实验揭示了其靶向性的根源:巨噬细胞对气溶素的敏感性是肠道上皮细胞的20-80倍【图2H-I】。这种极高的选择性,使其能够精准破坏免疫屏障不直接损伤肠道结构

MTB为独特定植菌:

研究者成功分离出产毒菌株,命名为巨噬细胞毒性细菌基因组分析显示,MTB是一种独特的气单胞菌变体,与常见的弗氏气单胞菌亲缘关系较近但存在明显差异【图2J-L】。关键在于,普通气单胞菌难以在健康肠道中定植,而MTB却能在肠道屏障受损(如使用抗生素后)的环境下成功扎根长期潜伏

毒素必需,屏障破坏关键:

为验证气溶素在致病机制中的核心作用,研究者构建了毒素基因敲除的MTB突变株结果显示,失去毒素的MTB虽能正常定植,却完全丧失了引发结肠炎的能力【图4A-K】;而回补毒素基因后,其致病力立即恢复【图4L-P】。这一系列实验铁证如山气溶素正是MTB致病的 “核心武器” 。那么,巨噬细胞缺失是否是MTB致病的必需环节?当我们先用药物清除小鼠结肠巨噬细胞,再引入MTB时,MTB便无法加剧炎症【图3I-K】。这一结果明确表明,MTB的危害必须通过破坏巨噬细胞屏障这一 “枢纽步骤” 来实现。

从实验室证据到人类疾病:

这一机制在患者群体中是否同样成立?流行病学数据给出了肯定的答案

超过70%的UC患者粪便中可检出气单胞菌,阳性率远高于健康人群(约12%)和其他炎症性肠病患者(约2.6%)【图5A】。

更为关键的是,研究者利用特异性抗体,首次在UC患者的结肠病变组织内直接检测到气溶素蛋白【图5C-E】。

抗毒素抗体有效:

基于这一机制,研究者进一步测试了 “解毒”策略。无论是预防性还是治疗性给予抗气溶素中和抗体,均能在小鼠模型中有效阻止显著缓解MTB诱导的结肠炎,并成功保护巨噬细胞屏障【图6】。

本研究系统揭示了溃疡性结肠炎发病的一条新途径——特定气单胞菌变体MTB易感肠道定植 → 持续分泌气溶素 → 靶向清除上皮下巨噬细胞 → 免疫屏障崩溃 → 结肠炎发生

这一发现不仅革新了对UC起病机制的传统认知,更指明了以气溶素为靶点进行诊断和治疗崭新策略

文章小结

本研究鉴定出一种产气单胞菌变异株MTB,其分泌的气溶素毒素选择性杀伤肠道巨噬细胞,从而破坏免疫屏障诱发结肠炎

抗气溶素抗体在动物实验中疗效显著。该发现揭示了UC发病的全新机制,为靶向细菌毒素诊疗策略提供了直接依据

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  1. CONNECT:[ UseTime:0.000377s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000561s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001656s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000646s ]
  6. SELECT * FROM `set` [ RunTime:0.005457s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000577s ]
  8. SELECT * FROM `article` WHERE `id` = 508972 LIMIT 1 [ RunTime:0.000421s ]
  9. UPDATE `article` SET `lasttime` = 1774568525 WHERE `id` = 508972 [ RunTime:0.004832s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000312s ]
  11. SELECT * FROM `article` WHERE `id` < 508972 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000967s ]
  12. SELECT * FROM `article` WHERE `id` > 508972 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001852s ]
  13. SELECT * FROM `article` WHERE `id` < 508972 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002340s ]
  14. SELECT * FROM `article` WHERE `id` < 508972 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002301s ]
  15. SELECT * FROM `article` WHERE `id` < 508972 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002329s ]
0.092713s