Mechanistic study of the therapeutic effect of berberine on ulcerative colitis in mice based on the Bak/Bax/Caspase-9 pathway
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摘要: 目的 探讨小檗碱通过Bak/Bax/Caspase-9通路对溃疡性结肠炎(ulcerative colitis,UC)小鼠保护作用的机制。方法 将32只C57BL/6小鼠随机分为正常组、模型组、美沙拉嗪组、小檗碱组,每组8只。除正常组外,其余组予以3%葡聚糖硫酸钠盐(dextran sulfate sodium salt,DSS)构建UC小鼠模型。记录各组小鼠的疾病活动指数(disease activity index,DAI)评分及体重;测量结肠长度、脾脏指数;通过苏木精-伊红染色观察结肠、脾脏组织病理变化;利用qRT-PCR和Western blot法分别检测结肠组织中Bak、Bax、Caspase-9的mRNA和蛋白表达。结果 与模型组比较,小檗碱组小鼠的DAI评分与脾脏指数显著降低(P < 0.05),结肠及脾脏病理损伤显著缓解,体重变化率和结肠长度显著升高(P < 0.01),结肠组织中Bak、Bax、Caspase-9的mRNA和蛋白表达显著降低(P < 0.05)。结论 小檗碱能够降低UC小鼠的炎症反应,改善结肠和脾脏病理损伤,其作用可能与调控Bak/Bax/Caspase-9通路相关。
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关键词:
- 溃疡性结肠炎 /
- 小檗碱 /
- 凋亡 /
- Bak/Bax/Caspase-9通路
Abstract: Objective This study aimed to investigate the protective effect of berberine on mice with ulcerative colitis(UC) and the involvement of the Bak/Bax/Caspase-9 pathway.Methods A total of thirty-two C57BL/6 mice were divided into four groups: normal group, model group, mesalazine group, and berberine group. The mice were randomly assigned to these groups for the study. The UC mouse model was induced in all groups using 3% dextran sulfate sodium salt(DSS). Disease activity index(DAI) score and body weight were recorded daily. Colon length and spleen index were measured. HE staining examined colon and spleen tissue changes. Bak, Bax, and Caspase-9 mRNA/protein expression in colon was measured via qRT-PCR/Western blot.Results Compared to the model group, the berberine group exhibited a significant reduction in the DAI score and spleen index(P < 0.05), along with improved colon and spleen pathological damage, there were significant increases in percentage of body weight change and colon length(P < 0.01), mRNA and protein expression of Bak, Bax, and Caspase-9 in colon tissues were significantly decreased in the berberine group(P < 0.05).Conclusion Berberine reduced inflammation and improved colon and spleen pathological damage in UC mice, potentially through modulation of the Bak/Bax/Caspase-9 pathway.-
Key words:
- ulcerative colitis /
- berberine /
- apoptosis /
- Bak/Bax/Caspase-9 pathway
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表 1 DAI评分
分数/分 体重变化率/% 粪便性状 便血情况 0 0 正常 隐血阴性 1 1~5 2 >5~10 稀便 隐血阳性 3 >10~15 4 >15 腹泻 肉眼血便 表 2 引物序列
基因 上游引物序列(5′-3′) 下游引物序列(5′-3′) GAPDH AGCTTGTCATCAACGGGAAG TTTGATGTTAGTGGGGTCTCG Bak GATGGACAACTTGCCCCTGGAAC AATTCTGGAACTCTGTGTCGTAGCG Bax GCTACAGGGTTTCATCCAGGATCG TGCTGTCCAGTTCATCTCCAATTCG Caspase-9 TGCTGTGTCAAGTTTGCCTACCC TGCTGTGTCAAGTTTGCCTACCC -
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