当前位置:首页>南昌>【Adv Sci】代谢组 | 南昌大学谢建华团队揭示硫酸化青钱柳多糖通过重塑肠道菌群,缓解溃疡性结肠炎!

【Adv Sci】代谢组 | 南昌大学谢建华团队揭示硫酸化青钱柳多糖通过重塑肠道菌群,缓解溃疡性结肠炎!

  • 2026-05-26 10:21:54
【Adv Sci】代谢组 | 南昌大学谢建华团队揭示硫酸化青钱柳多糖通过重塑肠道菌群,缓解溃疡性结肠炎!

导读:溃疡性结肠炎(UC)作为一种反复发作的炎症性肠病,其治疗一直是医学界的难题。传统中药青钱柳(Cyclocarya paliurus)的多糖成分虽被证实具有抗炎潜力,但其具体的“药理密码”尚未完全破译。

5月15日,南昌大学谢建华教授团队在Advanced Science发表最新研究。通过结构修饰,成功制备磺化青钱柳多糖(SCP),并利用多组学技术揭示了其治疗UC的全新机制:SCP并非直接作用于宿主,而是通过重塑肠道菌群,诱导宿主产生一种关键的脂质代谢物12-HEPE,从而抑制炎症通路。

这一发现不仅为中药多糖的现代化应用提供了坚实的理论依据,更揭示一条全新的“微生物群-宿主代谢-免疫”互作轴。


🔬 提炼机制图解:

启动信号:溃疡性结肠炎(UC)病理状态 → 肠道菌群紊乱、炎症通路过度激活

⬇️

干预阶段:SCP(硫酸化青钱柳多糖)干预 → 选择性富集拟杆菌门菌群、提升短链脂肪酸(SCFAs)水平 

⬇️

诱导阶段:菌群-宿主互作增强 → 诱导宿主内源性生成12-HEPE

⬇️

效应阶段:12-HEPE特异性结合并抑制TLR4 → 阻断下游NF-κB/NLRP3炎症通路 → 缓解溃疡性结肠炎


📝 整体研究过程与实验设计:

研究阶段
核心手段
关键结论
菌群依赖性验证
① 抗生素清除 (ABX)② 粪菌移植 (FMT)
SCP疗效完全依赖菌群:• 清空菌群后,SCP失效• 移植SCP供体菌群,可复刻疗效
代谢物功能确证
① 外源补充 (12-HEPE)② 激动剂阻断 (KS09)
12-HEPE 是核心效应分子:• 补充12-HEPE可模拟SCP的治疗效果• 激活TLR4后,12-HEPE疗效消失
分子互作机制
① 转录组/代谢组② 分子动力学模拟 (MD)
锁定 TLR4 为直接靶点:• 组学筛选出12-HEPE与拟杆菌门正相关• 模拟证实12-HEPE能稳定结合TLR4口袋

🌟研究结果解析

图 1. CP1的精细结构解析

☑ 结构基础:CP1主链由1,6-Glc与1,3-Gal以4:2比例交替连接,约每两个重复单元在O-2和O-6位发生取代

☑ 侧链组成:T-Araf、T-Glcp、1,4-Manp、1,3-Araf及1,2,6-Manp

☑ 硫酸化位点:2D NMR HSQC显示δ 84.71、83.82、80.11 ppm处峰减弱,证实C4(残基A)、C2(残基A)及C2(残基C)为主要硫酸化位点

☑ 表征手段:¹H NMR、DQF-COSY、HSQC、HMBC及SEM形貌观察联合确证

图 2. CP、SCP、ACCP及CMCP对DSS诱导小鼠结肠炎的缓解效应比较

☑ 筛选优势:SCP在体重维持、结肠长度保护、粪便性状改善及DAI降低方面效果最优

☑ 病理改善:SCP显著减轻炎症细胞浸润、绒毛丢失和隐窝破坏

☑ 分子机制:RNA-seq显示SCP组与模型组差异最大,MAPK、NFκB及ECM通路显著富集

☑ 免疫调节:SCP显著降低TNFα、IL-1β,恢复杯状细胞,减少CD4⁺/CD8⁺/巨噬细胞浸润

☑ 屏障修复:上调ZO-1、Occludin、Claudin-1及MUC-2表达,降低DAO、LBP、LPS水平

图 3. SCP对肠道菌群多样性及群落组成的重塑作用

☑ 菌群恢复:SCP使DSS扰动的菌群向正常组偏移,PCoA中SCP组最接近N组

☑ 门水平调控:显著降低Firmicutes丰度(p<0.05),升高Bacteroidetes丰度(p<0.05),优化F/B比值

☑ 关键菌属:富集g_Eubacterium等有益菌,降低c_Clostridiales等潜在致病菌

☑ 功能预测:SCP重塑的菌群增强SCFAs产生,恢复肠道微生态稳态

图 4.  抗生素清除实验验证SCP疗效依赖于肠道菌群

☑ 菌群清除:抗生素鸡尾酒显著耗尽肠道菌群,SCFAs降至模型组一半

☑ 表型逆转:抗生素处理后SCP对体重、结肠长度、粪便性状及DAI的改善作用完全消失

☑ 病理加剧:抗生素组炎症浸润和结构破坏较模型组更严重,SCP无法缓解

☑ 机制阻断:SCP对NFκB/ECM通路、紧密连接蛋白及细胞因子的调控在无菌状态下失效

图 5. 粪菌移植(FMT)验证SCP通过菌群介导抗结肠炎效应

☑ 移植成功:FMT组菌群组成与SCP供体高度相似,BacteroidetesFirmicutes变化趋势一致

☑ 表型复现:SCP粪菌移植可模拟SCP直接给药的疗效,改善体重、结肠长度及DAI

☑ 功能验证:FMT组SCFAs水平显著恢复,与SCP组相当

☑ 协同作用:FMT+SCP联合组未显著优于单独FMT组,提示SCP主要作为益生元而非直接抗炎。

图 6. 粪菌移植实验验证SCP通过重塑肠道菌群缓解结肠炎

☑ 宏观指标:FMT显著改善DSS诱导的体重下降、结肠缩短、粪便稀溏及pH升高

☑ 病理修复:恢复腺体排列,减轻炎症浸润和结构破坏

☑ 免疫调节:增加杯状细胞数量,降低CD4⁺/CD8⁺细胞浸润

☑ 通路抑制:FMT抑制NFκB、IκBα、SMAD2/3磷酸化及TLR4/MyD88/TGFβ3表达,与SCP机制一致

图 7. 12-HEPE外源性补充对DSS诱导结肠炎的缓解效应

☑ 代谢物筛选:靶向代谢组学发现SCP处理小鼠血清/肝脏中12-HEPE显著富集,抗生素清除后降低

☑ 功能验证:12-HEPE注射(100 ng/mL)可模拟SCP疗效,改善体重、结肠长度及DAI

☑ 病理改善:减轻结肠炎症浸润和结构破坏,恢复杯状细胞

☑ 机制指向:12-HEPE显著抑制TLR4/NFκB通路关键蛋白,提示其为菌群介导的宿主保护性代谢物

图 8. TLR4是12-HEPE发挥抗结肠炎作用的关键靶点

☑ 蛋白机制:12-HEPE显著抑制TLR4、MyD88、NFκB、IκBα及NLRP3表达,降低p-NFκB/NFκB、p-IκBα/IκBα比值

☑ 旁路影响:对TGFβ/SMAD及MAPK通路亦有抑制作用,但TLR4/NFκB为核心

☑ 分子对接:12-HEPE与TLR4结合自由能为−6.1 kcal/mol,结合于MD2疏水口袋

☑ 关键残基:HIS158、TYR183形成疏水相互作用,SER182、GLU265、PHE262、ALA157形成范德华力

☑ 动力学验证:100 ns MD模拟显示RMSD稳定在5.2 Å,Rg/SASA波动小,维持约2个氢键,RMSF<4 Å,证实结合稳定。

图 9. 12-HEPE通过阻断TLR4激活发挥结肠炎保护作用

☑ 靶点确证:TLR4激动剂KS09与12-HEPE联合给药后,12-HEPE对NFκB、IκBα磷酸化及MyD88、NLRP3的抑制作用完全消失

☑ 表型拯救:KS09存在时,12-HEPE对体重、结肠长度、粪便性状及DAI的改善作用全部失效

☑ 免疫逆转:杯状细胞恢复、CD4⁺/CD8⁺/巨噬细胞减少及炎症因子降低等效应均被阻断

☑ 结论:12-HEPE的抗结肠炎效应严格依赖于TLR4受体抑制,证实靶点特异性

图 10. 12-HEPE抗结肠炎机制的免疫细胞、炎症因子验证及临床队列检测

☑ 免疫调节:12-HEPE减少CD4⁺、CD8⁺、F4/80⁺细胞浸润,增加AB-PAS⁺杯状细胞

☑ 炎症平衡:降低TNFα、IL-1β、IFNγ、MPO、LBP、CCL2,升高IL-2、IL-4、IL-13、IL-17、IL-22

☑ 屏障修复:恢复Claudin-1、ZO-1及MUC-2表达,降低DAO

☑ 临床关联:活动期UC患者血清12-HEPE水平显著高于健康对照,提示其为宿主代偿性保护反应

☑ 转化价值:12-HEPE可能作为评估抗炎能力或预后的生物标志物,指导个体化补充治疗

参考文献:Chen, X., Shen, M., Zhang, R., et al. Sulfated Cyclocarya Paliurus Polysaccharide Sorchestrates the Gut Microbiome to Mobilize a Host-Derived 12-HEPE Against Ulcerative Colitis. Advanced Science, 2026. 
https://doi.org/10.1002/advs.75681                                                                                                                                                                                                                                                                                                
#肠道菌群#短链脂肪酸#肥胖#脂肪组织#粪菌移植#硫酸化青钱柳多糖

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  1. CONNECT:[ UseTime:0.001290s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002037s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000826s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000996s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001535s ]
  6. SELECT * FROM `set` [ RunTime:0.000731s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001828s ]
  8. SELECT * FROM `article` WHERE `id` = 516046 LIMIT 1 [ RunTime:0.001241s ]
  9. UPDATE `article` SET `lasttime` = 1780241209 WHERE `id` = 516046 [ RunTime:0.001654s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000777s ]
  11. SELECT * FROM `article` WHERE `id` < 516046 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001187s ]
  12. SELECT * FROM `article` WHERE `id` > 516046 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001722s ]
  13. SELECT * FROM `article` WHERE `id` < 516046 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001648s ]
  14. SELECT * FROM `article` WHERE `id` < 516046 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002035s ]
  15. SELECT * FROM `article` WHERE `id` < 516046 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002400s ]
0.177002s