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IF=8.0!南京中医药大学药学院:结构明确的白术多糖具有缓解环磷酰胺诱导的免疫抑制和促进小鼠肠道稳态恢复的能力

  • 2026-04-17 12:24:06
IF=8.0!南京中医药大学药学院:结构明确的白术多糖具有缓解环磷酰胺诱导的免疫抑制和促进小鼠肠道稳态恢复的能力

图文来源:作者团队

结构明确的白术多糖具有缓解环磷酰胺诱导的免疫抑制和促进小鼠肠道稳态恢复的能力

南京中医药大学药学院:Huanzhi Ren(第一作者)狄留庆教授和王令充副研究员(通讯作者)在《Food Research International》(IF:8.0)上发表了题目为“The structurally defined polysaccharide of Atractylodes macrocephala Koidz demonstrates the ability to alleviate cyclophosphamide-induced immunosuppression and promote the restoration of intestinal homeostasis in mice”的文章。

01
研究概述

本研究从白术中分离得到一种新型的水溶性多糖XGM,旨在进一步提高其开发利用的潜力。我们阐明了它的精确结构特征,并在小鼠模型中证明了它的免疫调节作用。XGM的结构分析,通过甲基化分析和核磁共振(NMR)光谱进行,结果表明,XGM为均一的木葡甘露聚糖,平均分子量为5.5kDa,其线性骨架由α-1,4,6-D-Glcp和α-1,4,6-D-Glcp残基组成,经口给予XGM可有效减轻环磷酰胺(CTX)诱导的小鼠免疫抑制,如血清TNF-α、IL-10、IgG、TNF-α、IL-10和IgM,以及CD4+/CD8+T细胞和Treg细胞比率的正常化。在机制上,发现XGM增强有益肠道微生物群的丰度,如乳酸杆菌属,并恢复色氨酸代谢,这是肠道免疫的关键途径。这些发现表明XGM通过调节肠道微生物群-代谢物轴发挥其免疫调节作用,从而对白术的健脾作用和XGM的作用机制提供了新的见解。

02
研究背景

白术作为一种历史悠久的中草药和营养补充剂,已被列入中国允许用于保健食品的成分清单,传统应用中最基本的功能之一是健脾补虚。现代植物化学研究将这种功效主要归因于其多糖.白术多糖具有多种药理学特性,包括抗肿瘤活性、免疫调节活性和保肝活性,这与白术的传统功效一致.动物实验证实,来自白术的多糖可激活IL-2/STAT5信号通路以调节免疫并促进T/B淋巴细胞增殖,协同增强免疫细胞的功能。

尽管已经证明了白术多糖用于免疫调节和疾病预防和治疗的显著潜力,但其精确的组成和结构组成仍然是不确定的。目前,大多数研究集中在水溶性低分子量多糖,如菊粉和直链淀粉类似物,而由于技术限制或研究偏见,相对较高分子量的多糖可能会被忽略。值得注意的是,多糖的免疫调节活性与其结构特征密切相关,包括类,例如,分子量分布为5-30 kDa的多糖通常表现出上级免疫调节效力,这归因于它们对于受体相互作用有利的空间构象。具体而言,结构基序如β-(1 → 3)-葡聚糖主链和(1 → 6)已知侧链以高亲和力结合免疫细胞上的特异性受体。这种靶向接合可以激活更广泛的信号级联,从而引发更强效的抗肿瘤和免疫调节作用。

深入挖掘白术中的新型活性多糖,不仅可以填补成分研究的空白,还可以全面分析其功效的物质基础。我们团队的开创性工作发现了一种被忽视的半纤维素组分--通过碱水解提取的结构独特的木葡甘露聚糖(XGM)。这种结构新奇转化为功能多样性:在酒精诱导的小鼠肝损伤模型中,XGM调节丙二醛(MDA)和超氧化物歧化酶(SOD)水平以减轻氧化应激,并有效恢复肝脏谷胱甘肽(GSH)稳态。体外研究进一步表明,XGM衍生的寡糖具有抗炎特性,与天然多糖的免疫激活作用相比,对巨噬细胞表现出明显的调节作用。研究结果揭示了XGM的潜在生物活性。

然而,这些研究进展仍存在局限性,缺乏对白术免疫调节机制的进一步阐明,尤其是口服XGM对肠道免疫轴的影响。,我们假设XGM的免疫调节作用涉及肠道微生物群重塑和相关代谢物恢复。为了验证这一假设,我们的研究采用了多组学方法来研究XGM之间的相互作用,该策略旨在探索XGM作为环磷酰胺(CTX)诱导的免疫抑制预防剂的潜力。这些见解可以为开发具有明确作用机制的新型免疫佐剂提供信息。

03
研究方法与结论

本研究系统地从白术中分离得到一种均质的木葡甘露聚糖(XGM),并利用核磁共振(NMR)、气相色谱-质谱(GC-MS)等综合分析手段对其结构进行了表征。我们采用CTX诱导的免疫抑制模型研究了XGM对血液学参数、脾脏免疫细胞功能、肠道微生物群组成和代谢的影响。首先,测定白色血细胞计数、血清细胞因子和免疫球蛋白水平(IL-10,TNF-α,IgG,IgM)来评估对免疫抑制的总体效果。流式细胞术表征脾T淋巴细胞亚群结合16SrRNA基因测序和非靶向代谢组学进行多组学探索,以阐明多糖介导的肠道微生物群-代谢产物-免疫轴相互作用机制。

本研究从白术中分离纯化得到一种多糖XGM,其化学结构经鉴定为半纤维素新系列木葡甘露聚糖(XGM),动物实验表明XGM对环磷酰胺(CTX)所致的免疫抑制和脾损伤有明显的改善作用,高剂量XGM可改善免疫功能低下小鼠肠道菌群的生态失调。代谢组学分析表明,CTX诱导的代谢异常可被大剂量XGM部分改善,色氨酸代谢显著改善,同时有益微生物代谢产物包括短链脂肪酸和维生素普遍增加。总之,本研究从肠道微生物群和代谢组学角度全面阐明了XGM的免疫调节机制,表明XGM具有作为天然膳食补充剂的良好潜力。

04
图文赏析

原文链接: 

https://doi.org/10.1016/j.foodres.2026.118554

如需原文文章,可以扫描下方二维码添加科研小助领取

翻译:彭怀南

编辑:科研小助

审核:杨静

专家指导:张康逸

供稿团队:小麦绿色精深加工与功能性食品创制创新团队

免责声明:本平台推送文章仅供学术交流,本平台不主张原文的版权,如有侵权,请联系删除。文献解读如有疏漏之处,我们深表歉意,请作者团队及时联系我们,我们会在第一时间进行修改或撤稿重发,感谢您的谅解!

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  1. CONNECT:[ UseTime:0.001494s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002661s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001199s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001154s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.002275s ]
  6. SELECT * FROM `set` [ RunTime:0.001016s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.009585s ]
  8. SELECT * FROM `article` WHERE `id` = 500059 LIMIT 1 [ RunTime:0.002098s ]
  9. UPDATE `article` SET `lasttime` = 1776403915 WHERE `id` = 500059 [ RunTime:0.010117s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001110s ]
  11. SELECT * FROM `article` WHERE `id` < 500059 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002478s ]
  12. SELECT * FROM `article` WHERE `id` > 500059 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000776s ]
  13. SELECT * FROM `article` WHERE `id` < 500059 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002745s ]
  14. SELECT * FROM `article` WHERE `id` < 500059 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004484s ]
  15. SELECT * FROM `article` WHERE `id` < 500059 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002789s ]
0.224264s