当前位置:首页>南昌>IF=14.1!南昌大学食品科学与资源挖掘全国重点实验室「谢建华」教授团队《Advanced Science》最新发文!

IF=14.1!南昌大学食品科学与资源挖掘全国重点实验室「谢建华」教授团队《Advanced Science》最新发文!

  • 2026-05-25 17:37:15
IF=14.1!南昌大学食品科学与资源挖掘全国重点实验室「谢建华」教授团队《Advanced Science》最新发文!

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2026年5月15日,南昌大学食品科学与资源挖掘全国重点实验室谢建华教授团队在国际顶级期刊《Advanced Science》(Q1,中科院1区Top,IF=14.1)发表题为“Sulfated Cyclocarya Paliurus Polysaccharide Sorchestrates the Gut Microbiome to Mobilize a Host-Derived 12-HEPE Against Ulcerative Colitis”的研究性论文。该文通讯作者为南昌大学食品科学与资源挖掘全国重点实验室申明月研究员(主要研究方向为食品化学与营养、食品安全)和谢建华教授(二级教授,美国普渡大学博士后,国家万人计划科技创新领军人才)。

成果介绍

  • 这项研究关注的是一个现实而棘手的问题:溃疡性结肠炎为什么难治,以及天然植物多糖能否通过调节肠道菌群来帮助缓解炎症。溃疡性结肠炎是一种反复发作的肠道炎症性疾病,患者常出现腹痛、腹泻、便血和免疫过度反应,长期患病还会增加结直肠癌风险。现有药物只能让部分患者获益,因此,寻找更温和、更具机制依据的新干预手段十分重要。本文研究对象是青钱柳多糖。青钱柳在我国南方分布较广,其叶片常被作为保健茶使用,已有研究认为其多糖成分具有抗氧化、抗炎和免疫调节作用,但天然多糖的理化性质限制了进一步应用。作者因此对青钱柳多糖进行了结构修饰,并比较了不同修饰方式对结肠炎的保护效果。

  • 研究首先制备并比较了天然青钱柳多糖、硫酸化青钱柳多糖、乙酰化青钱柳多糖和羧甲基化青钱柳多糖。结果发现,硫酸化青钱柳多糖,也就是SCP,效果最突出。在DSS诱导的小鼠结肠炎模型中,患病小鼠会出现体重下降、粪便变稀、结肠缩短、肠组织炎症浸润和隐窝结构破坏等典型症状。给予SCP后,这些症状明显减轻,结肠长度得到恢复,疾病活动指数下降,肠道组织损伤也更轻。与此同时,SCP还能降低TNF-α、IL-1β等促炎因子水平,恢复杯状细胞数量,提高紧密连接蛋白ZO-1、Occludin和Claudin-1等表达,说明它不仅是在“压低炎症”,还在帮助修复肠道屏障。

  • 更关键的是,研究发现SCP的作用并不是简单地直接作用于肠道细胞,而是很大程度上依赖肠道菌群。DSS处理后,小鼠肠道菌群发生紊乱,厚壁菌门增加,拟杆菌门减少;而SCP干预后,菌群结构向正常小鼠靠近,尤其是拟杆菌门等有益菌增加,短链脂肪酸水平也明显升高。短链脂肪酸是肠道菌群发酵膳食多糖产生的重要代谢物,能够为肠上皮细胞供能、维持屏障完整并调节免疫反应。因此,SCP更像是一种“菌群调度员”:它进入肠道后,为有益菌提供可利用底物,从而重塑肠道生态。

  • 为了证明这一点,作者设计了两个关键实验。第一,用抗生素清除小鼠肠道菌群后,SCP的保护作用基本消失,结肠炎反而更严重;第二,将SCP处理小鼠的粪菌移植给结肠炎小鼠,即使不额外给予SCP,也能模拟出类似的保护效果。这说明,SCP缓解结肠炎的核心环节确实是“先改变菌群,再由菌群影响宿主”。换句话说,SCP并不是单独作战,而是借助肠道微生物这个庞大的生态系统发挥作用。

  • 进一步的代谢组学分析揭示了一个重要分子:12-HEPE。它是一种来源于宿主的脂质介质,与炎症消退有关。研究发现,SCP处理和SCP来源粪菌移植都能提高小鼠血清和肝脏中的12-HEPE水平;而抗生素清除菌群后,12-HEPE显著下降。相关性分析显示,拟杆菌门与12-HEPE水平呈显著正相关,提示SCP富集的有益菌可能通过某些信号促进宿主产生12-HEPE。随后,作者直接给结肠炎小鼠补充12-HEPE,发现其同样能减轻体重下降、结肠缩短、炎症浸润和屏障损伤,说明12-HEPE很可能是连接“菌群变化”和“炎症缓解”的关键桥梁。

  • 那么12-HEPE如何抗炎?研究指向了TLR4信号通路。TLR4可以识别细菌来源的炎症刺激,是结肠炎进展中的重要“点火开关”。分子对接和分子动力学模拟显示,12-HEPE能够较稳定地结合TLR4;实验也显示,12-HEPE可抑制TLR4/MyD88/NF-κB/NLRP3炎症通路。但当研究者同时使用TLR4激活剂时,12-HEPE的保护作用被削弱甚至消失。这进一步证明,12-HEPE主要是通过阻断TLR4介导的炎症信号来发挥作用。

  • 有意思的是,在人群样本中,活动性溃疡性结肠炎患者血清12-HEPE水平并没有降低,反而高于健康人。作者认为,这并不意味着12-HEPE会促进疾病,而可能是机体面对炎症时启动的一种代偿性保护反应:炎症越明显,身体越试图产生更多促炎症消退的脂质介质来“刹车”。这一发现也提示,12-HEPE未来或许可以作为评估患者抗炎能力或疾病预后的潜在标志物。

  • 总体来看,这项研究提出了一条清晰的新机制:硫酸化青钱柳多糖进入肠道后,重塑菌群结构,富集有益菌并促进短链脂肪酸产生;被重塑的菌群进一步推动宿主产生12-HEPE;12-HEPE再通过抑制TLR4相关炎症信号,最终缓解溃疡性结肠炎。它的意义不只是发现了一种有潜力的天然多糖干预物,更重要的是揭示了“植物多糖—肠道菌群—宿主脂质代谢物—免疫受体”之间的连续调控链条,为利用食源性或药食同源成分干预炎症性肠病提供了新的思路。

图文赏析

说明:AI辅助完成,非原文图片,仅供参考,如有不妥,敬请谅解。

原文链接

https://doi.org/10.1002/advs.75681

① 长按二维码 或 ② 点击左下角“阅读原文”

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  1. CONNECT:[ UseTime:0.000647s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000985s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000337s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000646s ]
  6. SELECT * FROM `set` [ RunTime:0.000231s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000650s ]
  8. SELECT * FROM `article` WHERE `id` = 516425 LIMIT 1 [ RunTime:0.000498s ]
  9. UPDATE `article` SET `lasttime` = 1780207961 WHERE `id` = 516425 [ RunTime:0.004189s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000386s ]
  11. SELECT * FROM `article` WHERE `id` < 516425 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000625s ]
  12. SELECT * FROM `article` WHERE `id` > 516425 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000467s ]
  13. SELECT * FROM `article` WHERE `id` < 516425 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001392s ]
  14. SELECT * FROM `article` WHERE `id` < 516425 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000950s ]
  15. SELECT * FROM `article` WHERE `id` < 516425 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001274s ]
0.086310s