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南昌大学聂少平教授团队:肠道优势菌协同介导果胶对结肠炎症的改善作用

  • 2026-04-06 22:46:33
南昌大学聂少平教授团队:肠道优势菌协同介导果胶对结肠炎症的改善作用

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果胶作为应用最广泛的膳食纤维之一,其对结肠炎的缓解作用是如何实现的?南昌大学聂少平教授团队在国际期刊“Journal of Agricultural and Food Chemistry”发表了题为"Dominant Gut Commensals Enriched by Pectin with Low Esterification Degree Orchestrate the Amelioration of Acute Ulcerative Colitis”的文章,阐述了果胶基于菌群调节缓解结肠炎的作用机制,为利用低酯果胶及其衍生的菌群组合来开发创新性IBD疗法提供理论依据。

- 研究背景 -

炎症性肠病(IBD)严重影响健康,确切机制未明,肠道菌群失衡及其代谢产物改变被认为是关键致病因素。饮食因素与IBD密切相关,膳食纤维摄入不足显著增加患病风险。果胶作为安全天然的膳食纤维,其生物活性受酯化度影响。前期研究发现,低酯果胶缓解结肠炎的效果优于高酯果胶,且能显著富集双歧杆菌、拟杆菌及肠球菌等有益菌。

基于此,研究从健康供体中分离出果胶诱导的优势菌种(长双歧杆菌NSP002、解木聚糖拟杆菌NSP003和屎肠球菌NSP004),利用DSS诱导的急性结肠炎小鼠模型,开展粪便菌群移植及单菌/混菌干预实验。通过综合分析结肠病理、黏膜屏障、免疫反应、微生物组、基因转录及代谢组学等指标,旨在阐明肠道菌群在低酯果胶缓解结肠炎中的介导作用及潜在机制。

- 研究结果 -

1

低酯果胶对结肠炎的缓解作用

利用DSS诱导的小鼠结肠炎模型,采用粪菌移植(FMT)技术,将摄入低酯果胶小鼠的粪便移植给结肠炎小鼠。结果显示,与果胶预防干预组类似,接受粪菌移植的小鼠在多项病理指标上均表现出明显改善,包括体重减轻缓解、DAI值降低、结肠萎缩减轻、肠道屏障恢复,以及炎症因子水平和氧化应激水平显著下降。因此,低酯果胶预防溃疡性结肠炎的作用机制主要依赖于对肠道菌群组成的调节。

图 摄入果胶小鼠的粪便菌群移植缓解了DSS诱导的急性溃疡性结肠炎

2

优势菌对结肠炎的缓解作用

在单独肠道菌干预组中,长双歧杆菌NSP002活菌及其与果胶复配后,可改善小鼠体重及器官指数,缓解肠道炎性浸润,降低小鼠DAI值和肠道通透性,降低促炎因子及氧化应激水平;灭活菌仅可降低小鼠血清iNOS水平。解木聚糖拟杆菌NSP003活菌,可改善小鼠体重减轻、DAI值和脾脏指数,缓解结肠炎性浸润,降低氧化应激水平;与果胶复配后,还能够增加结肠长度,降低肠道通透性及炎症因子水平;灭活菌无明显改善作用。屎肠球菌NSP004活菌,可改善结肠炎小鼠肠道缩短情况,降低促炎因子TNF-α的分泌和iNOS的含量;与果胶复配后,还可显著改善体重减轻、DAI值及器官指数,缓解结肠炎性浸润;灭活菌仅上调了Occludin、下调了iNOS含量。

三种优势菌混合活菌或与果胶复配物,能够缓解结肠炎相关各项病理指标,但灭活混合菌仅降低小鼠血清iNOS水平。因此,推测三种优势菌复配后能够发挥相互促进的作用。

图 优势菌对结肠炎的缓解作用

3

肠道菌群介导缓解DSS诱导结肠炎的潜在机

3.1 肠道菌群重塑

通过对小鼠肠道菌群组成的分析发现,FMT及三种优势菌混合活菌显著增加了拟杆菌的丰度、降低了AkkermansiaHelicobacter的相对丰度。FMT及三种优势菌混合活菌显著增加了肠道中丙酸的水平。

图 FMT及优势菌群混合制剂对菌群的调节作用

3.2 肠道稳态调节

通过对小鼠结肠进行转录组分析发现,FMT及三种优势菌混合活菌组小鼠结肠中大量免疫球蛋白链显著上调,机体钙离子通路的基因下调,可能与MAPK、NOD-like receptor等信号通路激活相关,减少炎症因子IL-1β的生成,缓解炎症反应。

图 FMT及优势菌群混合制剂干预下的结肠组织基因转录谱分析

3.3 系统性代谢重编程

FMT及三种优势菌混合活菌组的小鼠血清代谢物组成明显区别于模型组。FMT及三种优势菌混合活菌组的小鼠血清中鞘氨醇、乳清酸等代谢物水平明显上升。

图 FMT及优势菌群混合制剂干预下的血清代谢组学分析

- 结论和展望 -

研究证实低酯果胶缓解结肠炎的作用依赖于肠道菌群。通过研究分离出长双歧杆菌NSP002、解木聚糖拟杆菌NSP003和屎肠球菌NSP004三株果胶诱导的优势菌株,发现其组合相比单一菌株具有更优越的协同保护效应,有望成为靶向性FMT的替代方案。机制上,该保护作用可能通过重塑肠道菌群、调节肠道稳态以及诱导系统性代谢重编程三条途径实现。未来该研究还需进一步向临床验证拓展,并深入探索菌群组合与药物的联用疗效及微胶囊优化技术。

复杂碳水化合物

供稿丨李   松

审核丨谭惠子

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  1. CONNECT:[ UseTime:0.000783s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000789s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000225s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000483s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000497s ]
  8. SELECT * FROM `article` WHERE `id` = 483661 LIMIT 1 [ RunTime:0.000403s ]
  9. UPDATE `article` SET `lasttime` = 1775534153 WHERE `id` = 483661 [ RunTime:0.009374s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000316s ]
  11. SELECT * FROM `article` WHERE `id` < 483661 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000513s ]
  12. SELECT * FROM `article` WHERE `id` > 483661 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000360s ]
  13. SELECT * FROM `article` WHERE `id` < 483661 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000854s ]
  14. SELECT * FROM `article` WHERE `id` < 483661 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000605s ]
  15. SELECT * FROM `article` WHERE `id` < 483661 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004239s ]
0.132043s