南方医科大学学报 ›› 2026, Vol. 46 ›› Issue (1): 131-140.doi: 10.12122/j.issn.1673-4254.2026.01.14

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茯苓新酸A通过调节AMPK/mTOR介导的自噬来减轻葡聚糖硫酸钠诱导的小鼠结肠炎

乔通1,3(), 尹林1, 张可妮1, 牛民主3, 黄菊2, 耿志军2, 李静1,2, 胡建国1,2()   

  1. 1.蚌埠医科大学第一附属医院,检验科,安徽 蚌埠 233030
    2.蚌埠医科大学第一附属医院,炎症相关性疾病基础与转化研究安徽省重点实验室,安徽 蚌埠 233004,安徽 蚌埠 233030
    3.蚌埠医科大学第一附属医院,基础医学院免疫学教研室,安徽 蚌埠 233030
  • 收稿日期:2025-05-19 出版日期:2026-01-20 发布日期:2026-01-16
  • 通讯作者: 胡建国 E-mail:qt1231126@163.com;jghu9200@bbmu.edu.cn
  • 作者简介:乔 通,在读硕士研究生,E-mail: qt1231126@163.com
  • 基金资助:
    安徽省临床医学研究转化专项(202427b10020093);安徽省卫生健康委科研项目(AHWJ2024Aa40007);安徽省高校优秀科研创新团队项目(2023AH010067)

Poricoic acid A alleviates dextran sulfate sodium-induced colitis in mice by regulating AMPK/mTOR-mediated autophagy and inhibiting intestinal epithelial cell apoptosis

Tong QIAO1,3(), Lin YIN1, Keni ZHANG1, Minzhu NIU3, Ju HUANG2, Zhijun Geng2, Jing LI1,2, Jianguo HU1,2()   

  1. 1.Department of Clinical Laboratory, First Affiliated Hospital of Bengbu Medical University
    Anhui Key Laboratory of Basic and Translational Research on Inflammatory Related Diseases, Bengbu 233004, China
    Department of Immunology, School of Laboratory Medicine, Bengbu Medical University, Bengbu 233030, China
  • Received:2025-05-19 Online:2026-01-20 Published:2026-01-16
  • Contact: Jianguo HU E-mail:qt1231126@163.com;jghu9200@bbmu.edu.cn

摘要:

目的 探讨茯苓新酸A(PAA)调控肠上皮细胞自噬对葡聚糖硫酸钠(DSS)诱导的小鼠结肠炎的作用和机制。 方法 18只C57BL/6小鼠随机分为对照组(WT组)、DSS模型组(DSS组)及PAA干预组(10 mg/kg),6只/组,评估小鼠体质量、结肠长度、疾病活动指数(DAI)及组织病理学评分等变化;构建DSS诱导的Caco-2细胞损伤模型,检测肠屏障蛋白(ZO-1、Claudin-1)、凋亡相关蛋白(Bcl-2/Bax/C-caspase3)及自噬标志物(LC3-II/I、P62)表达。通过分子对接和Western blotting分析PAA的作用机制。 结果 PAA显著改善DSS小鼠的体质量下降(P<0.05)、结肠缩短(P<0.05)及DAI评分升高(P<0.05),并降低结肠组织中促炎因子IL-1β和TNF-α水平(P<0.05)。此外,HE染色显示PAA缓解结肠隐窝损伤,降低炎症细胞浸润和炎症评分(P<0.05),AB-PAS染色显示PAA干预小鼠肠黏膜杯状细胞数量显著高于DSS组。PAA抑制了DSS诱导的紧密连接蛋白(ZO-1和Claudin-1)表达降低(P<0.05)和肠上皮细胞凋亡(降低Bax、C-caspase3,上调Bcl-2,P<0.05)。进一步分析发现,PAA可显著激活肠上皮细胞自噬水平(LC3-II/I比值升高,P62水平降低,P<0.05)。机制研究表明,PAA可通过靶向调控AMPK/mTOR信号,激活自噬并抑制肠上皮细胞凋亡。 结论 PAA通过AMPK/mTOR介导的自噬激活与肠上皮细胞凋亡途径,保护肠屏障功能和改善DSS诱导的小鼠结肠炎。

关键词: 炎症性肠炎, 茯苓新酸A, 自噬, 凋亡, 肠屏障

Abstract:

Objective To investigate the mechanism of poricoic acid A (PAA) for alleviating dextran sulfate sodium (DSS)-induced colitis in mice. Methods Eighteen C57BL/6 mice were randomly divided into control group, DSS-induced colitis model group, and PAA intervention (10 mg/kg) group. The changes in body weight, colon length, disease activity index (DAI), and histopathological scores of the mice were evaluated. In a DSS-induced Caco-2 cell model, the changes in expressions of ZO-1, claudin-1, Bcl-2, Bax, cleaved caspase-3, LC3-II/I, and P62 were detected. Molecular docking and Western blotting were used to analyze the mechanisms underlying the ameliorating effect of PAA on DSS-induced colitis. Results In the mouse models of DSS-induced colitis, PAA significantly ameliorated DSS-induced weight loss, colon shortening, and elevation of DAI scores while reducing colonic IL-1β and TNF-α levels. HE staining showed that PAA obviously alleviated colonic crypt damage, reduced inflammatory cell infiltration, and lowered histopathological scores of the colon. AB-PAS staining revealed significantly increased goblet cell counts in PAA-treated mice compared to those in DSS group. In DSS-induced Caco-2 cells, PAA treatment effectively inhibited DSS-induced downregulation of the tight junction proteins, reduced Bax and cleaved caspase-3 expressions, increased Bcl-2 expression and the LC3-II/I ratio, and decreased P62 expression. Mechanistic study suggested that PAA targeted the AMPK/mTOR pathway to activate autophagy and suppress cell apoptosis. Conclusion PAA protects intestinal barrier function and alleviates DSS-induced colitis in mice by activating AMPK/mTOR-mediated autophagy and inhibiting intestinal epithelial cell apoptosis.

Key words: inflammatory bowel disease, poricoic acid A, autophagy, apoptosis, intestinal barrier