Article(id=1212692427429827341, tenantId=1146029695717560320, journalId=1190317699101192196, issueId=1212692423956939344, articleNumber=1001-2494(2024)17-1581-09, orderNo=null, doi=10.11669/cpj.2024.17.005, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1715356800000, receivedDateStr=2024-05-11, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1767058005435, onlineDateStr=2025-12-30, pubDate=1725724800000, pubDateStr=2024-09-08, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1767058005435, onlineIssueDateStr=2025-12-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1767058005435, creator=13701087609, updateTime=1767058005435, updator=13701087609, issue=Issue{id=1212692423956939344, tenantId=1146029695717560320, journalId=1190317699101192196, year='2024', volume='59', issue='17', pageStart='1553', pageEnd='1664', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1767058004596, creator=13701087609, updateTime=1767058886858, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1212696124457140722, tenantId=1146029695717560320, journalId=1190317699101192196, issueId=1212692423956939344, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1212696124457140723, tenantId=1146029695717560320, journalId=1190317699101192196, issueId=1212692423956939344, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1581, endPage=1589, ext={EN=ArticleExt(id=1212692427807314704, articleId=1212692427429827341, tenantId=1146029695717560320, journalId=1190317699101192196, language=EN, title=Coptisine Derivative Q3 Ameliorates DSS-induced Ulcerative Colitis in Mice by Modulating TLR4/NF-κB Signaling Pathway and Intestinal Microbiota, columnId=null, journalTitle=Chinese Pharmaceutical Journal, columnName=null, runingTitle=null, highlight=null, articleAbstract=

OBJECTIVE To explore the mechanism of action of coptisine derivative Q3 against dextran sulfate sodium (DSS)-induced ulcerative colitis (UC) in mice from the perspective of changes in the inflammatory signaling pathway TLR4/NF-κB and compositions of the intestinal microbiota. METHODS Fifty mice were randomly divided into normal control group, model group, sulfasalazine (SASP) group, Q3-low dose group, Q3-high dose group, with 10 in each group. Mice in the groups except the control group were orally administered with 2.5% DSS solution to induce UC model. The SASP was given 700 mg·kg-1·d-1 of sulfasalazine by intragastric administration, and the Q3 low and high dose groups were given 50 and 100 mg·kg-1·d-1 of Q3, respectively. The other groups were given an equal amount of distilled water. After 6 days of administration, the mouse colon tissues were taken for DAI score and length measurement. HE staining was used to detect the degree of pathological damage in each group. 16S rRNA high-throughput sequencing was used to detect changes in intestinal flora in the intestinal contents of mice. Immunohistochemistry and Western blot were used to detect the expression of TLR4 and p-p65 in colon tissue. The protein expressions of TLR4, p-p65 and p-IκBα and the nuclear translocation of NF-κB p65 in IEC6 cells and RAW264.7 cells were detected by Western blot and immunofluorescence. RESULTS In the DSS-induced mouse ulcerative colitis model, compared with the model group, in vivo Q3 could significantly improve the weight loss, colon length, and increase in DAI scores of UC mice. HE staining results showed that Q3 significantly improved the intestinal pathological damages such as tract epithelial damage, crypt structure disorder and goblet cell reduction; immunohistochemistry and Western blot results showed that Q3 could significantly reduce the expression of TLR4 and p-p65 in the colon tissue of mice in the model group. The results of 16S rRNA showed that Q3 could increase the biodiversity of intestinal microbiota and regulate the composition of intestinal microbiota after DSS administration. It was also shown that in vitro Q3 could inhibit the nuclear translocation of NF-κB p65 in both IEC6 and RAW264.7 cells by immunofluorescence. CONCLUSION Q3 can improve intestinal inflammation by inhibiting the TLR4/NF-κB pathway and regulating the composition of intestinal flora, exerting anti-UC effects, which is expected to become a candidate compound for the treatment of UC.

, correspAuthors=Lianqiu WU, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Xiaoqian CHI, Changwei CHAI, Haijing ZHANG, Lianqiu WU), CN=ArticleExt(id=1212692430021907283, articleId=1212692427429827341, tenantId=1146029695717560320, journalId=1190317699101192196, language=CN, title=黄连碱衍生物Q3通过调节TLR4/NF-κB信号通路和肠道微生物改善葡聚糖硫酸钠诱导的小鼠溃疡性结肠炎研究, columnId=1212692426674848354, journalTitle=中国药学杂志, columnName=炎症性肠病研究专栏, runingTitle=null, highlight=null, articleAbstract=

目的 从炎症信号通路Toll 样受体4(TLR4)/核因子κB(NF-κB)以及肠道微生物群组成改变的角度探究黄连碱衍生物Q3抗葡聚糖硫酸钠(dextran sodium sulfate, DSS)诱导小鼠溃疡性结肠炎(ulcerative colitis, UC)的作用机制。方法 将50只小鼠随机分为正常对照组、模型组、阳性药柳氮磺吡啶(SASP)组、Q3-低剂量组和Q3-高剂量组,每组10只,除正常对照组外其余组小鼠以2.5% DSS溶液喂饮建立UC模型。SASP组灌胃给予700 mg·kg-1·d-1SAPA,Q3低与高两个剂量组分别灌胃给予50和100 mg·kg-1·d-1Q3,其余组给予等量蒸馏水。给药6 d后取小鼠结肠组织进行疾病活动指数(disease activity index, DAI)评分和长度测量,苏木精-伊红染色(hematoxylin-eosin staining,HE)检测各组病理损伤程度,16S rRNA高通量测序检测小鼠肠内容物中肠道菌群的变化,免疫组织化学(IHC)检测结肠组织TLR4和p-p65的表达,Western blot法检测结肠组织中TLR4、p-p65和p-IκBα的蛋白表达,体外实验,利用脂多糖(lipopolysaccharide, LPS)诱导炎症反应,免疫荧光法检测IEC6细胞和RAW264.7细胞中NF-κB p65的核转位。结果 体内:在DSS诱导的小鼠UC模型中,与模型组相比,Q3能够显著改善UC小鼠体重降低、结肠挛缩和DAI评分升高等情况,HE染色结果显示Q3明显改善UC小鼠肠道上皮破坏、隐窝结构紊乱和杯状细胞减少等病理损伤;16S rRNA结果表明Q3可以增加DSS作用后肠道菌群的生物多样性,调节肠道菌群组成。免疫组化和Western blot结果显示Q3可以显著降低模型组小鼠结肠组织中TLR4和p-p65的表达;体外:免疫荧光和Western blot结果显示Q3能够抑制IEC6和RAW264.7两种细胞中NF-κB p65的核转位。结论 Q3能够通过抑制TLR4/NF-κB通路以及调节肠道菌群组成改善肠道炎症,发挥抗UC作用,有望成为治疗UC的候选化合物。

, correspAuthors=吴练秋, authorNote=null, correspAuthorsNote=
* 吴练秋,女,博士,研究员,硕士生导师 研究方向:抗炎免疫相关疾病新靶点的发现和新药开发研究 Tel:(010)63031589
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迟笑倩和柴常伟为共同第一作者

迟笑倩,女,硕士研究生 研究方向:抗炎免疫;

柴常伟,男,硕士研究生 研究方向:抗炎免疫。

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Am J Physiol Gastrointest Liver Physiol, 2005, 288(5):G1055-1065., articleTitle=Toll-like receptor-4 is required for intestinal response to epithelial injury and limiting bacterial translocation in a murine model of acute colitis, refAbstract=null), Reference(id=1212786713731191806, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, doi=null, pmid=null, pmcid=null, year=2008, volume=125, issue=2, pageStart=145, pageEnd=153, url=null, language=null, rfNumber=[47], rfOrder=46, authorNames=HIMMEL M E, HARDENBERG G, PICCIRILLO C A, journalName=Immunology, refType=null, unstructuredReference=HIMMEL M E, HARDENBERG G, PICCIRILLO C A, et al. The role of T‐regulatory cells and Toll‐like receptors in the pathogenesis of human inflammatory bowel disease[J]. Immunology, 2008, 125(2):145-153., articleTitle=The role of T‐regulatory cells and Toll‐like receptors in the pathogenesis of human inflammatory bowel disease, refAbstract=null)], funds=[Fund(id=1212786708005966661, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, awardId=2022-I2M-1-014, language=CN, fundingSource=中国医学科学院医学与健康科技创新工程资助(2022-I2M-1-014), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1212786702595314291, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, xref=null, ext=[AuthorCompanyExt(id=1212786702607897203, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, companyId=1212786702595314291, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=State Key Laboratory of Digestive Health, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China), AuthorCompanyExt(id=1212786702616285812, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, companyId=1212786702595314291, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中国医学科学院、北京协和医学院药物研究所 消化健康全国重点实验室, 北京 100050)])], figs=[ArticleFig(id=1212786705359360774, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=EN, label=Fig.1, caption=Effects of Q3 on body weight, colon length, DAI score and pathology of UC model mice (×40). n=10,$\stackrel{-}{x}$±s

A-weight growth rate; B-colon length; C-disease activity index(DAI); D-colon morphology; E-hematoxylin-eosin staining of colons;→labeled inflammatory infiltrations and destroyed crypt structures;1) P<0.01, vs control group; 2) P<0.05,3) P<0.01, vs model group.

, figureFileSmall=vzQuCyt4UGIbDSDyUkFdGg==, figureFileBig=CBK5h93Xz4lf7Wu67vHX6w==, tableContent=null), ArticleFig(id=1212786705426469642, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=CN, label=图1, caption=Q3对溃疡性结肠炎(UC)模型小鼠体质量、结肠长度、疾病活动指数(DAI)评分以及病理的影响(×40)。n=10,$\stackrel{-}{x}$±s

A-体质量增长率变化;B-结肠长度;C-疾病活动指数(DAI);D-结肠形态;E-苏木精-伊红(HE)染色;→标记的是炎性浸润与被破坏的隐窝结构;与对照组相比,1) P<0.01; 与模型组相比,2) P<0.05,3) P<0.01。

, figureFileSmall=vzQuCyt4UGIbDSDyUkFdGg==, figureFileBig=CBK5h93Xz4lf7Wu67vHX6w==, tableContent=null), ArticleFig(id=1212786705581658896, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=EN, label=Fig.2, caption=Effects of Q3 on the expression of TLR4-related proteins in mouse colon tissue. n=10,$\stackrel{-}{x}$±s

A-immunohistochemistry of colon tissues(×200); B-expression changes of TLR4,p-p65,and p-IκBα protein in colon tissues; C-quantitative results of TLR4 expression; D-quantitative results of p-IκBα expression;1) P<0.05, vs control group;2) P<0.05, vs model group.

, figureFileSmall=Kv+JLhdUcud08OXJms/r/Q==, figureFileBig=GRG/iA5DJQDszGhLd1t1LA==, tableContent=null), ArticleFig(id=1212786705682322198, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=CN, label=图2, caption=Q3对小鼠结肠组织Toll样受体4(TLR4)相关蛋白表达的影响。n=10,$\stackrel{-}{x}$±s

A-结肠组织免疫组化(×200);B-结肠组织中TLR4、p-p65、p-IκBα蛋白的表达变化;C-TLR4表达的定量结果;D-p-IκBα表达的定量结果;与对照组相比,1) P<0.05;与模型组相比,2) P<0.05。

, figureFileSmall=Kv+JLhdUcud08OXJms/r/Q==, figureFileBig=GRG/iA5DJQDszGhLd1t1LA==, tableContent=null), ArticleFig(id=1212786705787179798, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=EN, label=Fig.3, caption=16S rRNA analysis of the effects of Q3 on the diversity of intestinal microbiota in mice. n=6-7

A-shannon index;B-ACE index;C-chao 1 index;D-observed-species index.

, figureFileSmall=RWfpmCtInbDwJVOwMNsV/A==, figureFileBig=YxqWgHI0eckaInb7ReBqQA==, tableContent=null), ArticleFig(id=1212786707024499480, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=CN, label=图3, caption=16S rRNA 分析Q3对小鼠肠道菌群多样性的影响。n=6~7

A-香农多样性指数;B-基于丰度的覆盖估计值指数;C-Chao 1 指数;D-观测物种指数。

, figureFileSmall=RWfpmCtInbDwJVOwMNsV/A==, figureFileBig=YxqWgHI0eckaInb7ReBqQA==, tableContent=null), ArticleFig(id=1212786707125162783, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=EN, label=Fig.4, caption=Effects of Q3 on intestinal microbiota abundance in mice at genus level. n=6-7,$\stackrel{-}{x}$±s, figureFileSmall=iS87OvELS69Mh/00RDFMbA==, figureFileBig=OcSfAVbUIQORnTMQoKL+HA==, tableContent=null), ArticleFig(id=1212786707209048870, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=CN, label=图4, caption=Q3在属水平对小鼠肠道菌群丰度的影响。n=6~7,$\stackrel{-}{x}$±s, figureFileSmall=iS87OvELS69Mh/00RDFMbA==, figureFileBig=OcSfAVbUIQORnTMQoKL+HA==, tableContent=null), ArticleFig(id=1212786707309712170, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=EN, label=Fig.5, caption=Effects of Q3 on the abundance of beneficial and pathogenic bacteria in the intestine of mice at the genus level. n=6-7,$\stackrel{-}{x}$±s

A-Effect of Q3 on the abundance of beneficial bacteria at the genus level;B-Effect of Q3 on the abundance of pathogenic bacteria at the genus level;1) P<0.05,3) P<0.01, vs control group; 2) P<0.05, vs model group.

, figureFileSmall=/N05wJUhPZWsyUfNKBRtZQ==, figureFileBig=71bXo7V2ZUTiEjjnK4bdpg==, tableContent=null), ArticleFig(id=1212786707393598251, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=CN, label=图5, caption=Q3在属水平对小鼠肠道有益菌群和致病菌群丰度的影响。n=6~7,$\stackrel{-}{x}$±s

A-属水平下Q3对有益菌群丰度的影响;B-属水平下Q3对致病菌群丰度的影响;与对照组相比,1) P<0.05,3) P<0.01; 与模型组相比,2) P<0.05。

, figureFileSmall=/N05wJUhPZWsyUfNKBRtZQ==, figureFileBig=71bXo7V2ZUTiEjjnK4bdpg==, tableContent=null), ArticleFig(id=1212786707511038768, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=EN, label=Fig.6, caption=The intestinal microbiota of mice in each group was based on the results of principal component analysis (PCA) of OTU. n=6-7,$\stackrel{-}{x}$±s, figureFileSmall=N0Cyx7RB+St1ZzUqusghGw==, figureFileBig=ql2jAkZllwYtJfMYL8iSuw==, tableContent=null), ArticleFig(id=1212786707611702072, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=CN, label=图6, caption=小鼠肠道菌群基于操作分类单元(OTU)的主成分分析(PCA)结果。n=6~7,$\stackrel{-}{x}$±s, figureFileSmall=N0Cyx7RB+St1ZzUqusghGw==, figureFileBig=ql2jAkZllwYtJfMYL8iSuw==, tableContent=null), ArticleFig(id=1212786707733336893, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=EN, label=Fig.7, caption=Effects of Q3 on changes of TLR4/NF-κB related protein expression in IEC6 and RAW 264.7 cells stimulated by LPS. n=3,$\stackrel{-}{x}$±s

A-expression of TLR4/NF-κB related proteins in IEC6 and RAW264.7 cells; B-nuclear translocation of NF-κB p65 in IEC6 and RAW264.7 cells(×63).

, figureFileSmall=VTrMkYhSuutpTBwq8IstCQ==, figureFileBig=mn+GsUj2XSKadvGo4TQZNA==, tableContent=null), ArticleFig(id=1212786707829805887, tenantId=1146029695717560320, journalId=1190317699101192196, articleId=1212692427429827341, language=CN, label=图7, caption=Q3对脂多糖(LPS)刺激IEC6与RAW264.7细胞后TLR4/NF-κB相关蛋白表达变化。n=3,$\stackrel{-}{x}$±s

A-IEC6和RAW264.7细胞中TLR4/NF-κB相关蛋白表达;B-IEC6和RAW264.7细胞中NF-κB p65核转位情况 (×63)。

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黄连碱衍生物Q3通过调节TLR4/NF-κB信号通路和肠道微生物改善葡聚糖硫酸钠诱导的小鼠溃疡性结肠炎研究
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迟笑倩 , 柴常伟 , 张海婧 , 吴练秋 *
中国药学杂志 | 炎症性肠病研究专栏 2024,59(17): 1581-1589
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中国药学杂志 | 炎症性肠病研究专栏 2024, 59(17): 1581-1589
黄连碱衍生物Q3通过调节TLR4/NF-κB信号通路和肠道微生物改善葡聚糖硫酸钠诱导的小鼠溃疡性结肠炎研究
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迟笑倩, 柴常伟, 张海婧, 吴练秋*
作者信息
  • 中国医学科学院、北京协和医学院药物研究所 消化健康全国重点实验室, 北京 100050
  • 迟笑倩,女,硕士研究生 研究方向:抗炎免疫;

    柴常伟,男,硕士研究生 研究方向:抗炎免疫。

通讯作者:

* 吴练秋,女,博士,研究员,硕士生导师 研究方向:抗炎免疫相关疾病新靶点的发现和新药开发研究 Tel:(010)63031589
Coptisine Derivative Q3 Ameliorates DSS-induced Ulcerative Colitis in Mice by Modulating TLR4/NF-κB Signaling Pathway and Intestinal Microbiota
Xiaoqian CHI, Changwei CHAI, Haijing ZHANG, Lianqiu WU*
Affiliations
  • State Key Laboratory of Digestive Health, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
出版时间: 2024-09-08 doi: 10.11669/cpj.2024.17.005
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目的 从炎症信号通路Toll 样受体4(TLR4)/核因子κB(NF-κB)以及肠道微生物群组成改变的角度探究黄连碱衍生物Q3抗葡聚糖硫酸钠(dextran sodium sulfate, DSS)诱导小鼠溃疡性结肠炎(ulcerative colitis, UC)的作用机制。方法 将50只小鼠随机分为正常对照组、模型组、阳性药柳氮磺吡啶(SASP)组、Q3-低剂量组和Q3-高剂量组,每组10只,除正常对照组外其余组小鼠以2.5% DSS溶液喂饮建立UC模型。SASP组灌胃给予700 mg·kg-1·d-1SAPA,Q3低与高两个剂量组分别灌胃给予50和100 mg·kg-1·d-1Q3,其余组给予等量蒸馏水。给药6 d后取小鼠结肠组织进行疾病活动指数(disease activity index, DAI)评分和长度测量,苏木精-伊红染色(hematoxylin-eosin staining,HE)检测各组病理损伤程度,16S rRNA高通量测序检测小鼠肠内容物中肠道菌群的变化,免疫组织化学(IHC)检测结肠组织TLR4和p-p65的表达,Western blot法检测结肠组织中TLR4、p-p65和p-IκBα的蛋白表达,体外实验,利用脂多糖(lipopolysaccharide, LPS)诱导炎症反应,免疫荧光法检测IEC6细胞和RAW264.7细胞中NF-κB p65的核转位。结果 体内:在DSS诱导的小鼠UC模型中,与模型组相比,Q3能够显著改善UC小鼠体重降低、结肠挛缩和DAI评分升高等情况,HE染色结果显示Q3明显改善UC小鼠肠道上皮破坏、隐窝结构紊乱和杯状细胞减少等病理损伤;16S rRNA结果表明Q3可以增加DSS作用后肠道菌群的生物多样性,调节肠道菌群组成。免疫组化和Western blot结果显示Q3可以显著降低模型组小鼠结肠组织中TLR4和p-p65的表达;体外:免疫荧光和Western blot结果显示Q3能够抑制IEC6和RAW264.7两种细胞中NF-κB p65的核转位。结论 Q3能够通过抑制TLR4/NF-κB通路以及调节肠道菌群组成改善肠道炎症,发挥抗UC作用,有望成为治疗UC的候选化合物。

溃疡性结肠炎  /  黄连碱衍生物  /  肠道菌群  /  Toll样受体4  /  NF-κB

OBJECTIVE To explore the mechanism of action of coptisine derivative Q3 against dextran sulfate sodium (DSS)-induced ulcerative colitis (UC) in mice from the perspective of changes in the inflammatory signaling pathway TLR4/NF-κB and compositions of the intestinal microbiota. METHODS Fifty mice were randomly divided into normal control group, model group, sulfasalazine (SASP) group, Q3-low dose group, Q3-high dose group, with 10 in each group. Mice in the groups except the control group were orally administered with 2.5% DSS solution to induce UC model. The SASP was given 700 mg·kg-1·d-1 of sulfasalazine by intragastric administration, and the Q3 low and high dose groups were given 50 and 100 mg·kg-1·d-1 of Q3, respectively. The other groups were given an equal amount of distilled water. After 6 days of administration, the mouse colon tissues were taken for DAI score and length measurement. HE staining was used to detect the degree of pathological damage in each group. 16S rRNA high-throughput sequencing was used to detect changes in intestinal flora in the intestinal contents of mice. Immunohistochemistry and Western blot were used to detect the expression of TLR4 and p-p65 in colon tissue. The protein expressions of TLR4, p-p65 and p-IκBα and the nuclear translocation of NF-κB p65 in IEC6 cells and RAW264.7 cells were detected by Western blot and immunofluorescence. RESULTS In the DSS-induced mouse ulcerative colitis model, compared with the model group, in vivo Q3 could significantly improve the weight loss, colon length, and increase in DAI scores of UC mice. HE staining results showed that Q3 significantly improved the intestinal pathological damages such as tract epithelial damage, crypt structure disorder and goblet cell reduction; immunohistochemistry and Western blot results showed that Q3 could significantly reduce the expression of TLR4 and p-p65 in the colon tissue of mice in the model group. The results of 16S rRNA showed that Q3 could increase the biodiversity of intestinal microbiota and regulate the composition of intestinal microbiota after DSS administration. It was also shown that in vitro Q3 could inhibit the nuclear translocation of NF-κB p65 in both IEC6 and RAW264.7 cells by immunofluorescence. CONCLUSION Q3 can improve intestinal inflammation by inhibiting the TLR4/NF-κB pathway and regulating the composition of intestinal flora, exerting anti-UC effects, which is expected to become a candidate compound for the treatment of UC.

ulcerative colitis  /  coptisine derivatives  /  intestinal flora  /  TLR4  /  NF-κB
迟笑倩, 柴常伟, 张海婧, 吴练秋. 黄连碱衍生物Q3通过调节TLR4/NF-κB信号通路和肠道微生物改善葡聚糖硫酸钠诱导的小鼠溃疡性结肠炎研究. 中国药学杂志, 2024 , 59 (17) : 1581 -1589 . DOI: 10.11669/cpj.2024.17.005
Xiaoqian CHI, Changwei CHAI, Haijing ZHANG, Lianqiu WU. Coptisine Derivative Q3 Ameliorates DSS-induced Ulcerative Colitis in Mice by Modulating TLR4/NF-κB Signaling Pathway and Intestinal Microbiota[J]. Chinese Pharmaceutical Journal, 2024 , 59 (17) : 1581 -1589 . DOI: 10.11669/cpj.2024.17.005
溃疡性结肠炎(ulcerative colitis, UC)是一种病因不明的慢性炎症性肠病[1] 。UC的病理机制涉及肠道上皮屏障缺陷、肠道微生物群紊乱和免疫反应失调等[2],其症状取决于结肠炎症的部位和严重程度,多表现为便血、里急后重和腹痛[3] 。2023年流行病学调查数据显示,北美地区UC的患病率约占人口的0.4%,共计有150万左右患者深受UC的困扰[4]。虽然UC多发于北美地区,但随着亚洲以及拉丁美洲等大陆板块现代化与工业化水平逐渐提升,UC已然演变为严峻的全球卫生问题[5]
临床常用的治疗药物包括5-氨基水杨酸类药物、皮质类固醇和免疫抑制剂,这些药物大多疗效不理想或不良反应严重,不能用于长期治疗;针对具体靶点的生物制剂(如抗TNF-α单克隆抗体和抗IL-23单克隆抗体等)疗效有所改善,但由于患者个体差异大并且生物制剂价格高昂导致应用受限[6-7]。因此,寻找更安全更有效且经济负担小的潜在治疗药物具有重要的临床意义。
Toll样受体(toll-like receptors,TLR)是一类跨膜蛋白家族受体,在非特异性或先天免疫防御中发挥关键作用。TLR4/NF-κB作为一条经典炎症信号通路,常活跃于多种炎症性疾病的发病机制中并发挥关键作用[8-9]。UC患者结肠黏膜中常见TLR4/核因子κB(NF-κB)信号通路的异常激活,这种异常的激活导致肠道炎症持续加重,因此,靶向TLR4成为治疗药物研发的方向之一[10]。与此同时,与疾病相关的肠道菌群的研究表明,紊乱的肠道菌群在肠道疾病包括炎症性肠病(inflammatory bowel disease, IBD)、肥胖、肝病和结直肠癌等的发生发展过程中发挥着关键作用[11]。肠道菌群的动态失衡增加了能够分泌内毒素的革兰阴性细菌的丰度,高水平的内毒素与TLR4结合激活NF-κB通路,使得异常激活的炎症反应持续发生[12]。最新研究也证明,过度激活的免疫反应,尤其是通过肠道微生物组扰动介导的TLR依赖性免疫功能障碍,在IBD的发病机制中起关键作用[13]
黄连是一种传统中草药,在我国广泛用于治疗包括腹泻、急性肠胃炎在内的多种疾病[14] 。黄连碱是黄连的特征活性成分之一,具有典型的天然生物碱骨架,具有广泛的抗炎、抗菌、抗肿瘤等显著的生物活性,是一种很有前景的治疗UC的活性成分[15-16]。本项目通过对天然活性产物黄连碱进行结构修饰改造获得了黄连碱衍生物Q3,经前期工作[17]确认Q3具有良好的体外抗炎活性。基于以上研究基础,本课题组着眼于TLR4/NF-κB信号通路并结合肠道菌群,综合探讨并考察了黄连碱衍生物Q3抗UC的药效与机制,证明了黄连碱衍生物Q3具有开发成治疗UC药物的潜在可能性,为黄连碱衍生物的进一步开发提供科学依据。
超净工作台(北京东联哈尔仪器制造有限公司,型号:DJ-CJ-2ND),低温离心机(日本久保田公司,型号:K21128-F000),一体式化学发光成像仪(上海勤翔科学仪器有限公司,型号:ChemiScope S6),酶标分析仪(美国Bio-Tek公司),共聚焦显微镜(美国Leica公司),光学显微镜(日本Olympus公司),细胞恒温培养箱(北京五洲东方科技发展有限公司),蛋白电泳仪(美国Bio-Rad公司)。
化合物Q3(中国医学科学院药物研究所自行合成),葡聚糖硫酸钠(dextran sulfate sodium,DSS,美国MP Biomedicals公司,批号:YD08001),柳氮磺吡啶(SASP)肠溶片(上海信谊天平药业有限公司,批号:09230106),10%福尔马林中性组织固定液、DMEM培养基、PBS缓冲液、RIPA裂解液、蛋白酶混合抑制剂(北京索莱宝科技有限公司),胎牛血清(FBS)、青霉素和链霉素(美国Gibco Life Technologies公司),脂多糖(LPS)、Triton X-100(美国Sigma-Aldrich公司),Western blot 快速制胶试剂盒(北京聚德安泰科技有限公司),聚偏二氟乙烯(PVDF)膜(美国Merck Millipore公司),牛血清白蛋白(BSA,北京普利莱基因技术有限公司),TLR4抗体(美国Abcam公司,货号:ab217274),p-p65、p-IκBα、NF-κB p65抗体(美国Cell Signaling Technology公司,货号:3033S、2859S、8242S),甘油醛-3-磷酸脱氢酶(GAPDH)(博奥瑞京北京科技发展有限公司,货号:ab1019t),山羊抗兔IgG、山羊抗鼠IgG抗体(北京中杉金桥生物技术有限公司,货号:ZB-2301、ZB-5305)山羊血清(碧云天),山羊抗兔488 nm荧光抗体(proteintech公司,货号:SA00013-2)。
C57BL/6J雄性小鼠,SPF级,50只,6~8周龄,体重(20±2)g。饲养于中国医学科学院药物研究所动物房,温度25 ℃,湿度40%,每12 h明暗交替循环饲养,动物自由饮食、饮水。所有动物实验按照相关规定执行,并经中国医学科学院药物研究所实验动物福利和伦理委员会审核批准,批号:00009659。
小鼠于SPF级动物房适应性饲养7 d后随机分为5组:即CON组、MOD组、SASP组、Q3-低剂量组、Q3-高剂量组,每组10只。除CON组外,MOD组及各给药组小鼠给予2.5%DSS水溶液替代正常饮水,每日自由饮水诱导小鼠结肠炎模型。从造模第二天开始灌胃给药,SASP组给予700 mg·kg-1·d-1,Q3低、高两个剂量组分别给予50和100 mg·kg-1·d-1,其余组给予等量蒸馏水。约6 d后MOD组动物出现明显精神萎靡、活动减少、稀便等UC典型症状。在第8天终止实验,处死各组动物,并检测结肠炎各项相关评价指标,综合评价黄连碱衍生物Q3的抗UC药效学活性。
取各实验组病变部位结肠保存于10%福尔马林组织固定液中,使用梯度浓度的乙醇脱水后,将组织包埋于石蜡中,并切5 μm厚组织切片,载于玻片上,清洗并重新水化。按照标准方法使用苏木精和伊红对组织切片进行染色。光镜下观察组织形态学改变。
取结肠组织按照0.1 g·mL-1的比例加入含有蛋白酶抑制剂和磷酸酶抑制剂的RIPA裂解液,在冰上匀浆,裂解45 min后离心取上清,BCA蛋白法定量上清中蛋白总含量;SDS-PAGE电泳分离蛋白,电转移至PVDF膜上,5%BSA室温封闭1 h,以1%BSA稀释液按照相应的稀释比例稀释一抗(TLR4,1∶1 000;p-p65,1∶1 000;p-IκBα,1∶1 000;GAPDH,1∶5 000),4 ℃结合过夜,二抗按照相应的稀释比例稀释(山羊抗兔IgG、山羊抗鼠IgG抗体,1∶5 000)常温孵育1 h,化学发光法检测目的条带。利用Image J软件分析蛋白条带灰度值,以各组目的蛋白条带与各组内参GAPDH条带的灰度值比值作为该蛋白的相对表达量并进行统计分析。
将包埋于石蜡中的组织进行5 μm厚的切片,组织切片载于玻片上并于60 ℃烘箱中烘干备用,以1∶100的比例稀释抗体并用链霉菌抗生物素蛋白-过氧化物酶联结(streptavidin-perosidase, SP)两步法进行IHC染色,脱水封片后置于100倍光学显微镜下观察。
分别给予IEC6细胞和RAW264.7细胞10、1 μg·mL-1的LPS进行造模,给药组在造模的基础上给予10 μmol·L-1 Q3,24 h后弃去培养基,加入4%多聚甲醛室温固定细胞30 min后加入0.3%Triton X-100对细胞进行通透处理。15 min后弃去透膜液加入10%山羊血清封闭30 min,加入NF-κB p65抗体(1∶400)4 ℃孵育过夜。荧光二抗室温避光孵育1 h,冲洗,加入4',6-二脒基-2-苯基吲哚(4',6-diamidino-2-phenylindole,DAPI)混合封片剂后于共聚焦显微镜下观察。
收集小鼠粪便并储存于-80 ℃。将小鼠粪便分为3组(n=6~7):CON组、MOD组和Q3(100 mg·kg-1)组。粪便样本在干冰条件下送往微基生物科技(上海)有限公司进行16S rDNA基因测序。使用QIAamp® Fast DNA Stool Mini Kit 提取小鼠粪便中总细菌的DNA。选择对应于细菌16S rRNA V3-V4区域的引物进行扩增。所有样本的序列数据的测序结果和统计结果均基于测序读数和操作分类单位(OTU)。
使用GraphPad Prism 8.3.0软件进行数据分析,实验结果以“Means±SD”表示。多组间比较采用单因素方差分析,两组间比较采用t检验。P<0.05表示有显著统计学差异。
本研究构建了DSS诱导的小鼠UC模型用于评价黄连碱衍生物Q3的抗UC活性,主要通过小鼠体质量变化率、结肠长度以及疾病活动指数(disease activity index,DAI)三项指标进行综合评价。实验结果(图1A~D)显示,与正常对照组相比,MOD组在造模8 d后体质量下降了16.95%,具有显著统计学差异。造模后8 d MOD组小鼠体形消瘦,弓背,毛色暗淡无光,肛周明显可见血样黏液分泌。将小鼠安乐死后取结肠进行长度测量与DAI评分,MOD组小鼠结肠挛缩明显,DAI明显升高,以上结果提示UC造模成功。通过给予Q3治疗后,UC小鼠体质量下降、结肠挛缩与DAI升高等情况得到了明显的改善,并具有统计学差异。此外,Q3能够显著改善UC小鼠结肠组织的病理损伤。光镜下观察组织HE染色切片(图1E),与MOD组相比,Q3给药组小鼠结肠组织黏膜结构趋于完整,杯状细胞数量有所升高,隐窝结构的破坏得到了明显控制,黏膜固有层中炎性浸润明显减少;SASP组小鼠结肠组织结构有所恢复,但腺体排列仍紊乱且炎性浸润明显。综上所述,黄连碱衍生物Q3具有一定程度上的抗UC活性,并且药效优于阳性药SASP。
为阐明Q3的抗UC作用机制,本研究对小鼠结肠组织进行了免疫组织化学分析(图2A)。与CON组相比,MOD组小鼠结肠组织固有层中TLR4/NF-κB信号通路相关蛋白,如TLR4和p-p65等均存在大量表达的情况,而Q3降低了TLR4和p-p65的表达水平。小鼠结肠组织的Western blot(图2B~D)结果显示,MOD组小鼠结肠组织中TLR4、p-IκBα表达量升高,与模型组相比,Q3组小鼠结肠组织中TLR4和p-IκBα均有所降低。这提示Q3可能通过TLR4/NF-κB通路改善DSS诱导的UC炎症。
取小鼠结肠内容物进行16S rRNA进行分析。α多样性指数,包括Shannon指数、ACE、Chao1指数以及观测物种指数等可以用于判断肠内容物中肠道菌群的多样性。与CON组相比,MOD组小鼠结肠肠道菌群α多样性显著下降(P <0.05,图3),属水平上瘤胃梭菌属(Ruminiclostridium)、副拟杆菌属(Parabacteroides)、另枝菌属(Alistipes)和阿克曼菌属(Akkermansia)等有益菌的相对丰度降低;毛梭菌属(Lachnoclostridium)、假单胞菌属(Pseudomonas)、粘螺菌属(Mucispirillum)和埃希菌属(Escherichia)等致病菌的相对丰度升高(图4~5)。瘤胃梭菌属(Ruminiclostridium)、阿克曼菌属(Akkermansia)等有益菌在免疫和炎症应答、短链脂肪酸的产生和肠道屏障完整性维持中起到重要作用;而毛梭菌属(Lachnoclostridium)、假单胞菌属(Pseudomonas)等致病菌属与持续的炎症反应密切相关。给予Q3后小鼠肠道菌群的多样性增加,并逆转了部分菌群在MOD组中的含量变化,例如:瘤胃梭菌属等的相对丰度增加,而毛梭菌属等的相对丰度降低。基操作分类单元(operational taxonomic units,OTU)的主成分分析(principal component analysis,PCA)结果(图6)显示,DSS显著改变了小鼠肠道微生物群组成,给予Q3可以调节UC小鼠的肠道微生物群组成。以上结果表明,Q3可以通过调节肠道微生物群有益菌与致病菌的稳态平衡发挥抗UC的作用。
为了进一步研究Q3抑制DSS诱导的UC机制,本研究在体外建立LPS诱导的 IEC6细胞和RAW264.7细胞两种模型,通过检测Q3对LPS诱导后两种细胞炎症介质蛋白表达水平的影响判断Q3的作用机制。Western blot结果显示(图7A),LPS处理后IEC6和RAW264.7细胞中TLR4、p-p65和p-IκBα蛋白表达水平增加,表明存在NF-κB通路的活化,而Q3可显著抑制这些异常活化的NF-κB通路相关蛋白的表达水平。此外,免疫荧光结果证明黄连碱衍生物Q3可以通过抑制NF-κB p65的核转位抑制TLR4/NF-κB通路(图7B)。这些结果表明,Q3可能通过抑制NF-κB p65的核转位减弱TLR4/NF-κB信号级联,从而发挥抗UC作用。
UC具有复杂的发病机制。研究表明,UC的致病机制与宿主炎症反应和肠道微生态失调有关[18-19],是一种由基因-环境相互作用驱动的对肠道微生物群的异常免疫反应[20]。目前的治疗措施着重于抑制炎症,比如5-氨基水杨酸类药物、糖皮质激素等在轻度至重度UC中的应用。但除此之外,已有的小分子药物与生物制剂仍无法达到理想的治疗效果,伴随着UC的高复发性,往往为患者带来巨大痛苦的同时也加重社会医疗体系的负担[21]。因此,寻找药效更佳且对患者经济负担更小的药物已成为当务之急。目前已有多方研究报道提示中药治疗在UC中发挥着不可小觑的作用[22]
黄连是一种著名的中药材,在距今1 800年前的《神农本草经》就已提到黄连清热燥湿,泻火解毒的突出疗效。近些年来,由于在临床上展现了治疗UC等多种潜在用途,黄连受到了各国学者的广泛关注[23]。作为黄连的特色活性成分之一,黄连碱表现出类似的治疗效应和突出的药理活性,但较低的生物利用度阻碍了黄连碱药效的进一步提高[24]。因此,笔者通过一定的结构修饰和改造合成了一种源自黄连碱的单体化合物Q3,意图通过有针对性地改善黄连碱的药动学特性提高其成药性,最大程度上发挥黄连碱治疗UC的药用潜力。
TLR4是模式识别受体(PRR)家族的重要成员,是肠道微生物群变化的关键感应器,在肠道中可特异性识别病原体相关分子模式(PAMP)和损伤相关分子模式(damage associated molecular patterns,DAMPs)[25-26]。在UC中,TLR4作为传感器介导肠道共生微生物群与宿主免疫之间的串扰[27],细胞表面的TLR4感知肠道微生物的变化并对相关分子模式进行特异性识别,通过MyD88和TRIF依赖途径进行上下游信号传递,最终激活NF-κB[28]。在未激活状态下,NF-κB与其抑制蛋白IκB结合,作为非活性二聚体复合物存在于细胞质中。在各种炎症刺激激活后,IκBα被IκB激酶磷酸化后降解,NF-κB p65释放进入细胞核激活相关基因转录表达,促进炎性细胞因子的产生,引发炎症反应[29-30]。正常生理过程中,炎性细胞因子生成有利于组织修复,但过度活化的NF-κB通路会引起炎症介质和细胞因子过度释放,最终形成持续的、不可控的炎症,导致组织损伤[31]。研究表明,TLR4在IBD患者的上皮和固有层细胞中高表达[32],由于TLR4/NF-κB信号通路的持续激活肠道炎症反复不断,迁延难愈[33]
TLR4/NF-κB信号通路的异常持续激活与肠道致病菌丰度显著增加有关。肠道致病菌与有益菌的稳态失调使得肠道内LPS含量增加,进而激活TLR4/NF-κB信号通路,诱发下游炎症级联反应。这种肠道菌群结构或数量失衡并不仅仅局限于消化道疾病,在代谢综合征以及高脂血症、肥胖等疾病领域也体现出一定的疾病相关性[34]
DSS诱发的结肠炎能够导致结肠功能障碍,包括严重的肠道屏障损伤、炎症浸润、直肠出血和肠道菌群变化,与人类UC的临床和组织学表现相似[35-36]。在本研究中,通过构建DSS诱导的小鼠UC模型,考察并确认了黄连碱衍生物Q3在体内的抗UC活性。在评估UC进展时,体质量变化率、DAI 评分和结肠长度通常被视为炎症指标[37]。研究结果显示,Q3显著改善了小鼠UC症状,具体体现在与MOD组相比,给予Q3的小鼠体质量有所恢复、DAI评分降低、结肠挛缩得到改善、组织病理学损伤减轻。在正常生理条件下,TLR4在肠上皮细胞中低水平表达[38];在UC的病理条件下,细菌释放的LPS通过作用于TLR4受体激活宿主炎症反应[29],这一作用触发下游NF-κB通路的激活和促炎介质的产生,从而促进UC肠道炎症发展。因此,提出Q3是否通过调节TLR4/NF-κB通路抑制DSS诱导的小鼠UC的猜想。IHC和WB结果表明,给予DSS进行造模后小鼠结肠组织中TLR4、p-p65和p-IκBα的表达显著上调,Q3可以显著降低小鼠结肠组织中TLR4、p-p65和p-IκBα的蛋白表达。在IEC6和RAW264.7两种细胞上建立LPS刺激的体外炎症模型也表明Q3可以通过抑制NF-κB p65的核转位抑制NF-κB信号通路的激活。以上体内体外结果表明Q3可通过抑制TLR4/NF-κB信号通路发挥抗UC药效。
在一些小鼠肠道炎症模型中,UC可以通过具有IBD样表型小鼠的粪便转移至无菌小鼠身上[39],在常规条件下饲养时自发发生UC的几种模型在无菌条件下饲养时并未显示出炎症[40-41],这提示我们肠道微生物群在IBD的炎症发展中起到重要作用。此前的研究表明,单味中药和众多名方中药均可发挥不同程度的抗炎作用,并能够有效改善UC小鼠肠道菌群[42-43]。中药有效成分能够与肠道菌群发生相互作用,通过调节肠道菌群结构及其代谢产物发挥维持肠道微生物稳态的功能[44]。最新研究显示,TLR4信号通路对于肠道上皮的损伤以及共生菌群的识别均起到不可或缺的作用,是一把“双刃剑”[13]。慢性炎症不可避免地被TLR4通路放大,导致UC持续进展;而在稳态条件下识别共生菌群保证耐受性,消除病原微生物方面TLR4又是必要的[45-47]。结合Q3对TLR4/NF-κB通路抑制作用的初期验证,为了研究Q3是否对肠道菌群具有一定改善作用,对不同给药组小鼠的肠道微生物群组成进行了16S rRNA分析。肠道菌群多样性结果表明,Q3有助于恢复UC小鼠肠道菌群的多样性。从群落结构来看,Q3能够恢复瘤胃梭菌属 (Ruminiclostridium) 、副拟杆菌属( Parabacteroides)等的丰度。同时,阿克曼菌(Akkermansia)等几种益生菌的丰度在给予Q3后显著增加。这证明Q3发挥的抗UC药效部分依托于对肠道菌群的调节作用。
综上所述,本研究发现经过结构修饰改造后的黄连碱衍生物Q3具有明显的抗UC活性,该作用强于SASP且剂量优势明显,具有进一步开发成为治疗UC的候选药物的潜力。Q3的治疗作用一方面体现在可以通过抑制TLR4/NF-κB通路缓解炎症反应;另一方面,Q3可以调节肠道菌群的组成,提高有益菌的丰度,从而改善肠道菌群状态,使肠道炎症损伤得到一定程度的恢复。尽管证明了Q3对TLR4/NF-κB通路的抑制作用,但Q3通过TLR4对UC过程中肠道菌群和宿主免疫的影响还需要未来进行深入探究。本研究为黄连碱衍生物Q3继续开发应用于市场进行UC的治疗提供了可靠的实验依据。
  • 中国医学科学院医学与健康科技创新工程资助(2022-I2M-1-014)
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2024年第59卷第17期
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doi: 10.11669/cpj.2024.17.005
  • 接收时间:2024-05-11
  • 首发时间:2025-12-30
  • 出版时间:2024-09-08
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  • 收稿日期:2024-05-11
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中国医学科学院医学与健康科技创新工程资助(2022-I2M-1-014)
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    中国医学科学院、北京协和医学院药物研究所 消化健康全国重点实验室, 北京 100050

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* 吴练秋,女,博士,研究员,硕士生导师 研究方向:抗炎免疫相关疾病新靶点的发现和新药开发研究 Tel:(010)63031589
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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