实验动物与比较医学 ›› 2026, Vol. 46 ›› Issue (3): 332-343.DOI: 10.12300/j.issn.1674-5817.2025.105

• 人类疾病动物模型 • 上一篇    下一篇

两种雌性小鼠溃疡性结肠炎模型的比较与行为学观察

王娟1(), 徐佳慧1, 田韵远2, 张萌萌1, 李敏1, 王四旺2, 李瑶1()()   

  1. 1.陕西中医药大学药学院, 咸阳 712046
    2.西北大学生命科学学院, 西安 710069
  • 收稿日期:2025-07-02 修回日期:2025-12-09 出版日期:2026-06-25 发布日期:2026-06-19
  • 通讯作者:
    李 瑶(1991—),女,博士,讲师,研究方向为中药抗溃疡性结肠炎。E-mail:18792768149@163.com。ORCID:0000-0001-5464-8855
  • 作者简介:王 娟(2001—),女,硕士研究生,研究方向为中药抗溃疡性结肠炎。E-mail:15389667931@163.com。ORCID:0009-0000-3566-9271
  • 基金资助:
    国家自然科学基金资助项目“瑶药救必应‘功效成分组’调控NF-κB/MLCK信号通路改善肠黏膜屏障损伤抗溃疡性结肠炎的机制研究”(82304865);陕西中医药大学研究生质量提升工程专项项目“救必应-漏芦药对改善溃疡性结肠炎的药效物质基础和作用机制研究”(CXSJ202420);咸阳市科学技术研究与发展计划-秦创原中医药产业创新聚集区项目“夏酮丸抗肝纤维化的作用机制研究”(L2024-QCY-ZYYJJQ-X221)

Comparison and Behavioral Observation of Two Female Mice Models of Ulcerative Colitis

WANG Juan1(), XU Jiahui1, TIAN Yunyuan2, ZHANG Mengmeng1, LI Min1, WANG Siwang2, LI Yao1()()   

  1. 1.College of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, China
    2.College of Life Sciences, Northwest University, Xi'an 710069, China
  • Received:2025-07-02 Revised:2025-12-09 Published:2026-06-25 Online:2026-06-19
  • Contact: LI Yao (ORCID: 0000-0001-5464-8855), E-mail: 18792768149@163.com

摘要:

目的 比较葡聚糖硫酸钠(dextran sulfate sodium salt,DSS)诱导建立的雌性C57BL/6J和BALB/c溃疡性结肠炎(ulcerative colitis,UC)小鼠模型,为治疗UC创新药物研究中雌性动物模型选择提供依据。 方法 6~8周龄的C57BL/6J和BALB/c雌性小鼠各24只,分别分为对照组、2.5% DSS饮用3 d(UC-3d)组、2.5% DSS饮用7 d(UC-7d)组和2.5% DSS饮用7 d后更换纯水3 d(UC-停药)组,每组6只。每日记录每只小鼠体重、便血及粪便性状,计算疾病活动指数(disease activity index,DAI)评分。DSS诱导结束后,取材前给小鼠灌胃异硫氰酸荧光素(fluorescein isothiocyanate,FITC)-葡聚糖溶液,4 h后在吸入4%异氟烷深度麻醉下,经眼底静脉丛采血后以颈椎脱臼法实施安乐死。随即分离结肠,测量从肛门至回盲部的长度;取结肠段进行固定、包埋、切片后,采用HE染色和阿尔新蓝-过碘酸希夫(alcian blue-periodic acid-Schiff,AB-PAS)染色法综合评估结肠炎症程度。同时摘取脾脏并称重,计算脾脏系数。通过检测血清中FITC荧光强度及D-乳酸浓度,评价肠道通透性及屏障损伤情况。通过测定小鼠的理毛时长、埋球个数及旷场中心停留时间与总运动路程,评估小鼠的焦虑/抑郁样行为。 结果 DSS自由饮用3 d后,C57BL/6J和BALB/c小鼠均出现粪便隐血。与对照组相比,UC-7d组和UC-停药组BALB/c雌性小鼠体重下降率无显著变化(P>0.05),但DAI评分升高(P<0.01);而UC-7d组和UC-停药组C57BL/6J雌性小鼠体重下降率和DAI评分均升高(P<0.01)。C57BL/6J雌性小鼠的UC-7d组和UC-停药组脾脏系数较对照组升高(P<0.05),且结肠显著缩短(P<0.01),血清中FITC荧光强度明显升高(P<0.01),结肠出现明显的炎症反应区域,杯状细胞及酸性黏液层受损;而BALB/c雌性小鼠的UC-7d组和UC-停药组结肠长度及血清中FITC荧光强度和D-乳酸浓度均较对照组无显著变化(P>0.05),结肠组织黏膜层有少量炎症细胞和受损杯状细胞,其余无明显病变。此外,UC-7d组C57BL/6J雌性小鼠的旷场总运动路程和埋球个数均明显减少(P<0.05),表现出抑郁行为;理毛时长增加(P<0.05),表现出焦虑行为。 结论 BALB/c雌性小鼠对2.5% DSS不敏感,无法表现出典型的UC结肠病理变化。而2.5% DSS自由饮用7 d可成功诱导C57BL/6J雌性小鼠出现典型的UC病理症状和结肠病理变化,这一变化可持续至DSS停药后3 d,并且伴随小鼠焦虑/抑郁症状,提示该模型或可用于UC发病机制和治疗药物的研究。

关键词: 葡聚糖硫酸钠, 溃疡性结肠炎, 组织病理学变化, 焦虑/抑郁样行为, C57BL/6J小鼠, BALB/c小鼠

Abstract:

Objective To compare female C57BL/6J and BALB/c mice models of ulcerative colitis (UC) induced by dextran sulfate sodium salt (DSS), providing a reference for selecting female animal models in studies of innovative drugs for UC treatment. Methods A total of 48 female mice aged 6–8 weeks, including 24 C57BL/6J and 24 BALB/c mice, were divided into four groups: control group, UC-3d group (2.5% DSS drinking for 3 days), UC-7d group (2.5% DSS drinking for 7 days), and UC-withdrawal group (2.5% DSS drinking for 7 days followed by 3 days of pure water replacement), with 6 mice in each group. Body weight, fecal occult blood, and stool characteristics were recorded daily, and disease activity index (DAI) scores were calculated. At the end of DSS induction, mice were gavaged with fluorescein isothiocyanate (FITC)-labeled dextran solution before tissue collection. Four hours later, under deep anesthesia induced by inhalation of 4% isoflurane, blood samples were collected from the retro-orbital venous plexus, and euthanasia was performed by cervical dislocation. The colon was then separated immediately, and its length from the anus to the ileocecal junction was measured. Colon tissues were fixed, embedded, and sectioned, and they were evaluated using hematoxylin-eosin (HE) staining and alcian blue-periodic acid-Schiff (AB-PAS) staining to comprehensively assess the degree of colonic inflammation. The spleen was also collected and weighed, and the spleen coefficient was calculated. Serum FITC fluorescence intensity and D-lactic acid concentration were measured to evaluate intestinal permeability and barrier injury. The grooming duration, the number of buried marbles, the time spent in the center of the open field, and the total distance traveled were measured to evaluate anxiety/depression-like behaviors in mice. Results Fecal occult blood appeared in both C57BL/6J and BALB/c mice after 3 days of ad libitum access to DSS. Compared with the control group, there was no significant change in the weight loss rate of female BALB/c mice in the UC-7d and UC-withdrawal groups (P > 0.05), but the DAI score increased (P < 0.01). Conversely, both the weight loss rate and DAI score increased for female C57BL/6J mice in the UC-7d and UC-withdrawal groups (P < 0.01). In female C57BL/6J mice, both the UC-7d and UC-withdrawal groups had higher spleen coefficients than the control group (P < 0.05). Additionally, in these groups, colon length was significantly reduced (P < 0.01), FITC fluorescence intensity in serum was markedly increased (P < 0.01), obvious inflammatory reaction areas appeared in the colon, and the goblet cells and acidic mucus layer were damaged. In contrast, in female BALB/c mice, no significant differences were observed in colon length, serum FITC fluorescence intensity, or D-lactic acid concentration between the UC-7d and UC-withdrawal groups compared with the control group (P > 0.05). Only a few inflammatory cells and damaged goblet cells were observed in the colonic mucosal layer, and no other obvious pathological changes were detected. In addition, female C57BL/6J mice in the UC-7d group showed a significantly reduced total distance in the open field and fewer buried marbles (P < 0.05), indicating depression-like behavior, as well as prolonged grooming duration (P < 0.05), indicating anxiety-like behavior. Conclusion Female BALB/c mice are not sensitive to 2.5% DSS and do not show typical colonic pathological changes of UC. In contrast, ad libitum access to 2.5% DSS for 7 days successfully induces typical UC pathological symptoms and colonic pathological changes in female C57BL/6J mice. These changes persist for 3 days after DSS withdrawal, and the mice also exhibit symptoms of anxiety/depression. The results suggest that this model can be used for research on the pathogenesis and therapeutic drugs of UC.

Key words: Dextran sulfate sodium salt, Ulcerative colitis, Histopathological changes, Anxiety/depression-like behaviors, C57BL/6J mice, BALB/c mice

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