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柠檬苦素对溃疡性结肠炎大鼠肠道损伤和肠道菌群紊乱的改善
作用及机制
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张 霞 ,贾慧宇 ,康金旺 ,赵汉清(1.河北北方学院附属第二医院消化内科,河北 张家口 075100;2.河北北
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方学院附属第二医院检验科,河北 张家口 075100;3. 河北北方学院附属第二医院中医科,河北 张家口
075100)
中图分类号 R965 文献标志码 A 文章编号 1001-0408(2024)01-0051-06
DOI 10.6039/j.issn.1001-0408.2024.01.09
摘 要 目的 探究柠檬苦素对溃疡性结肠炎(UC)大鼠肠道损伤和肠道菌群紊乱的改善作用及机制。方法 构建UC大鼠模型,
将建模成功的70只大鼠随机分为模型组和柠檬苦素低、中、高剂量组(12.5、25、50 mg/kg)以及柳氮磺胺吡啶组(阳性对照组,500
mg/kg),每组14只;另取14只大鼠作为对照组。各组大鼠灌胃相应药液或等量生理盐水,每天1次,连续2周。末次给药结束24 h后,
观察大鼠一般情况并称重,取结肠组织进行结肠黏膜损伤指数(CMDI)评分;检测大鼠结肠组织中白细胞介素1β(IL-1β)、IL-6、
肿瘤坏死因子 α(TNF-α)水平;观察大鼠结肠组织病理学变化;检测大鼠结肠组织中紧密连接蛋白 1(Claudin-1)、闭合蛋白
(Occludin)、闭锁小带蛋白 1(ZO-1)、高迁移率族蛋白 B1(HMGB1)、晚期糖基化终末产物受体(RAGE)蛋白的表达水平;基于
16S rRNA检测大鼠肠道菌群的相对丰度。结果 与对照组相比,模型组大鼠精神状态不佳、皮毛较暗、情绪烦躁易发怒,结肠组织
腺体排列杂乱,出现炎症细胞浸润和细胞坏死、水肿现象;CMDI评分和结肠组织中IL-1β、IL-6、TNF-α水平,HMGB1、RAGE蛋白
表达水平以及肠道变形菌门、拟杆菌门菌群的相对丰度均显著升高(P<0.05);体重和结肠组织中Claudin-1、Occludin、ZO-1蛋白
表达水平以及肠道厚壁菌门菌群的相对丰度均显著降低(P<0.05)。与模型组相比,柠檬苦素各剂量组大鼠一般情况和结肠组织
病理损伤均改善,上述指标水平均显著逆转(P<0.05),且具有剂量依赖性(P<0.05);柳氮磺胺吡啶组与柠檬苦素高剂量组大鼠
各项指标比较,差异均无统计学意义(P>0.05)。结论 柠檬苦素可改善UC模型大鼠肠道损伤及肠道菌群紊乱,其作用机制可能
与下调HMGB1/RAGE信号通路活性有关。
关键词 柠檬苦素;溃疡性结肠炎;肠道损伤;肠道菌群;高迁移率族蛋白 B1/晚期糖基化终末产物受体信号通路
Improvement effects of limonin on intestinal injury and intestinal flora disturbance in rats with ulcerative
colitis and its mechanism
ZHANG Xia ,JIA Huiyu ,KANG Jinwang ,ZHAO Hanqing(1. Dept. of Gastroenterology, the Second Affiliated
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Hospital of Hebei North University, Hebei Zhangjiakou 075100, China;2. Dept. of Clinical Laboratory, the
Second Affiliated Hospital of Hebei North University, Hebei Zhangjiakou 075100, China;3. Dept. of Traditional
Chinese Medicine, the Second Affiliated Hospital of Hebei North University, Hebei Zhangjiakou 075100,
China)
ABSTRACT OBJECTIVE To investigate the improvement effects of limonin on intestinal injury and intestinal flora disturbance
in rats with ulcerative colitis (UC) and its mechanism. METHODS UC rat models were established, and 70 rats with successful
modeling were randomly divided into model group, limonin low-, medium-, and high-dose groups (12.5, 25, 50 mg/kg), and
sulfasalazine group (positive control group,500 mg/kg), with 14 rats in each group. Another 14 rats were selected as the control
group. After modeling, each group was given the corresponding drug or equal amount of normal saline, once a day, for 2 weeks.
Twenty-four hours after the last administration, the general condition of rats was observed and the body weight was measured, and
colon tissue was collected for colonic mucosal damage index (CMDI) scoring; the levels of interleukin-1β (IL-1β), IL-6 and
tumor necrosis factor-α (TNF-α) in colon tissue were detected; the pathological changes of colon tissue were observed; the protein
expressions of Claudin-1, Occludin, ZO-1, high mobility group protein B1 (HMGB1) and receptor for advanced glycation end
products (RAGE) in colon tissue were detected; fecal 16S
Δ 基金项目 河北省医学科学研究课题计划项目(No.20210853)
rRNA sequencing was used to detect the relative abundance of
*第一作者 副主任医师。研究方向:溃疡性结肠炎。E-mail:
zhangxiaxia5287@163.com intestinal microbiota in rats. RESULTS Compared with the
中国药房 2024年第35卷第1期 China Pharmacy 2024 Vol. 35 No. 1 · 51 ·