Article(id=1320889699464491829, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1320889471592149951, articleNumber=null, orderNo=null, doi=10.13386/j.issn1002-0306.2025010184, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1737388800000, receivedDateStr=2025-01-21, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1792854245296, onlineDateStr=2026-10-24, pubDate=1771084800000, pubDateStr=2026-02-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792854245296, onlineIssueDateStr=2026-10-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792854245296, creator=13701087609, updateTime=1792854245296, updator=13701087609, issue=Issue{id=1320889471592149951, tenantId=1146029695717560320, journalId=1260987677001138203, year='2026', volume='47', issue='4', pageStart='1', pageEnd='524', issueExtLink='null', onlineDate='null', pubDate='1771084800000', pubDateStr='2026-02-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792854190967, creator='13701087609', updateTime=1792854190967, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=425, endPage=434, ext={EN=ArticleExt(id=1320889699657429814, articleId=1320889699464491829, tenantId=1146029695717560320, journalId=1260987677001138203, language=EN, title=Mechanistic Study of Astragaloside IV on Intestinal Barrier Function in Colitis Mice Through AhR/IL-22 Signaling Pathway, columnId=1261343846965830077, journalTitle=Science and Technology of Food Industry, columnName=Nutrition and Healthcare, runingTitle=null, highlight=null, articleAbstract=

Objective: To investigate the effects of Astragaloside IV (AS-IV) on intestinal barrier function in mice with ulcerative colitis (UC) and to explore its underlying mechanisms. Methods: The UC mouse model was established using 3% dextran sulfate sodium (DSS). Upon successful model establishment, the animals were divided into control, DSS model, and AS-IV treatment groups (10, 20 and 40 mg/kg). All treatments were administered via oral gavage once daily for 10 days. The protein expression levels of the AhR/IL-22 pathway were analyzed by Western blotting. Fluorescence in situ hybridization (FISH) was performed to examine DAPI staining patterns in colon tissue sections. Apoptosis rates were measured by flow cytometry, and transcriptional levels of AHR, CYP1A1, and IL-22 were evaluated using qRT-PCR. Results: AS-IV ameliorated intestinal inflammation, reduced intestinal permeability, and promoted the restoration of colonic tight junction structures in colitis mice, potentially through activation of the AhR/IL-22 pathway. The therapeutic effects of AS-IV were partially attenuated by the AhR antagonist CH223191, whereas the AhR agonist FICZ exhibited comparable protective effects on colitis symptoms and intestinal barrier function. In vitro mechanistic investigations demonstrated that AS-IV treatment significantly upregulated the expression of CYP1A1 (P<0.01), a downstream target protein of AhR, in MNK-3 cells. Furthermore, AS-IV markedly enhanced IL-22 secretion (P<0.01) by facilitating AhR nuclear translocation. Notably, these regulatory effects were substantially diminished in AhR-silenced MNK-3 cells (shAhR-MNK3) (P>0.05), conclusively establishing that AS-IV modulates IL-22 production through an AhR-dependent mechanism. Conclusion: AS-IV ameliorated UC by activating the AhR/IL-22 pathway in ILC3 cells, thereby restoring intestinal barrier function. These findings highlight AS-IV as a potential therapeutic candidate for UC treatment.

, authors=Jie ZHOU1, Xuxia REN1, Yan SU1, Youqing DONG1, Feiyang LONG1, Yi MU1, Chang YU1, 3, *, Zaijing YUAN2, *, authorsList=Jie ZHOU, Xuxia REN, Yan SU, Youqing DONG, Feiyang LONG, Yi MU, Chang YU, Zaijing YUAN, authorCompany=null, correspAuthors=Chang YU, Zaijing YUAN, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Science and Technology of Food Industry. All rights reserved., 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, fund=null), CN=ArticleExt(id=1320889701100270403, articleId=1320889699464491829, tenantId=1146029695717560320, journalId=1260987677001138203, language=CN, title=基于AhR/IL-22通路探讨黄芪甲苷对结肠炎小鼠肠道屏障功能的影响及机制, columnId=1261343850979779009, journalTitle=食品工业科技, columnName=营养与保健, runingTitle=null, highlight=null, articleAbstract=

目的:研究黄芪甲苷 (Astragaloside IV,AS-IV)对溃疡性结肠炎(Ulcerative colitis,UC)小鼠肠道屏障功能的影响,并探讨其潜在机制。方法:使用3%葡聚糖硫酸钠(Dextran sulfate sodium,DSS)构建小鼠UC模型,建模成功后分为空白对照组、模型对照组、黄芪甲苷低、中、高剂量组(10、20、40 mg/kg),各组灌胃相应药物,每日1次,连续给药10 d。Western blotting检测AhR/IL-22通路的蛋白表达水平;荧光原位杂交技术检测结肠组织切片DAPI染色情况;流式细胞术检测细胞凋亡水平;qRT-PCR检测AHR、CYP1A1、IL-22等mRNA表达水平。结果:AS-IV可能通过促进AhR/IL-22通路改善结肠炎小鼠的肠道炎症状态,降低了肠道通透性,并促进了结肠紧密连接结构的修复。AhR拮抗剂CH223191可部分阻断AS-IV的治疗效果,而AhR激动剂FICZ可改善结肠炎小鼠的症状和肠道屏障功能。进一步的体外机制研究发现,AS-IV处理显著提高了MNK-3细胞中AhR下游靶蛋白CYP1A1的表达水平(P<0.01),并通过促进AhR核转位显著增强IL-22的分泌(P<0.01)。重要的是,在AhR基因沉默的MNK-3细胞(shAhR-MNK3)中,AS-IV对CYP1A1表达和IL-22分泌的促进作用被显著抑制(P<0.05),表明AS-IV通过AhR依赖性机制调控IL-22的产生。结论:AS-IV通过ILC3中的AhR/IL-22通路改善肠上皮屏障,改善结肠炎,从而为UC提供潜在的治疗方法。

, authors=周杰1, 任旭霞1, 苏岩1, 董右青1, 龙飞扬1, 牟易1, 余畅1, 3, *, 袁在静2, *, authorsList=周杰, 任旭霞, 苏岩, 董右青, 龙飞扬, 牟易, 余畅, 袁在静, authorCompany=null, correspAuthors=余畅, 袁在静, authorNote=

周杰(1990−),女,博士,助理研究员,研究方向:膳食营养,E-mail:

, correspAuthorsNote=
余畅(1970−),女,博士,教授,研究方向:慢性代谢性疾病,E-mail:。
袁在静(1989−),女,本科,主治医师,研究方向:炎症性肠病,E-mail:。
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周杰(1990−),女,博士,助理研究员,研究方向:膳食营养,E-mail:

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周杰(1990−),女,博士,助理研究员,研究方向:膳食营养,E-mail:

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Mucosal Immunology, 2022, 15(3): 480−490., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1320889701377094468, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, xref=1, ext=[AuthorCompanyExt(id=1320889701389677381, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, companyId=1320889701377094468, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1School of Basic Medicine Science, Chongqing University of Chinese Medicine, Chongqing 402760, China), AuthorCompanyExt(id=1320889701402260294, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, companyId=1320889701377094468, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1重庆中医药学院基础医学院,重庆 402760)]), AuthorCompany(id=1320889703054816071, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, xref=2, ext=[AuthorCompanyExt(id=1320889703063204680, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, companyId=1320889703054816071, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2Zhaotong First People's Hospital, Yunnan Province, Zhaotong 657000, China), AuthorCompanyExt(id=1320889703071593289, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, companyId=1320889703054816071, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2云南省昭通市第一人民医院,云南昭通 657000)]), AuthorCompany(id=1320889703159673674, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, xref=3, ext=[AuthorCompanyExt(id=1320889703168062283, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, companyId=1320889703159673674, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=3Chongqing Medical University, Chongqing 400030, China), AuthorCompanyExt(id=1320889703176450892, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, companyId=1320889703159673674, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=3重庆医科大学,重庆 400030)])], figs=[ArticleFig(id=1320889708142506878, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=EN, label=Fig.1, caption=AS-IV ameliorates DSS-induced colitis in mice (n=6), figureFileSmall=2BU2WW2wau1fRvN8tBMtaA==, figureFileBig=8z3Tt+LBs3/0vDmTRHJFBw==, tableContent=null), ArticleFig(id=1320889708230587263, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=CN, label=图1, caption=AS-IV改善DSS诱导的小鼠结肠炎(n=6)

注:Control:空白对照组;Model:DSS模型组;AL:AS-IV(10 mg/kg)组;AM:AS-IV(20 mg/kg)组;AH:AS-IV(40 mg/kg)组;CH+A:CH223191(AhR抑制剂组,10 mg/kg)+AS-IV(40 mg/kg)组;###表示与空白对照组相比,P<0.001;*表示与模型组相比,P<0.05,**表示P<0.01,***表示P<0.001;ΔΔΔ表示与AH组相比,P<0.001;图2~图6同。

, figureFileSmall=2BU2WW2wau1fRvN8tBMtaA==, figureFileBig=8z3Tt+LBs3/0vDmTRHJFBw==, tableContent=null), ArticleFig(id=1320889708465468288, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=EN, label=Fig.2, caption=AS-IV improves intestinal barrier structure and function in colitis mice, figureFileSmall=v3JmQR+VMxT3UGL13qZL5w==, figureFileBig=a06FPgiI7PjcVbj7u6nIIA==, tableContent=null), ArticleFig(id=1320889708662600577, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=CN, label=图2, caption=AS-IV改善结肠炎小鼠的肠道屏障结构和功能, figureFileSmall=v3JmQR+VMxT3UGL13qZL5w==, figureFileBig=a06FPgiI7PjcVbj7u6nIIA==, tableContent=null), ArticleFig(id=1320889708876510082, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=EN, label=Fig.3, caption=AS-IV alleviates colitis in mice by upregulating the AhR/IL-22 pathway (n=6), figureFileSmall=72U0aYGVfTondVHb4pg6PA==, figureFileBig=MDLhhlwZWzzbaa49HdjbLw==, tableContent=null), ArticleFig(id=1320889708956201859, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=CN, label=图3, caption=AS-IV通过上调AhR/IL-22通路来减轻小鼠结肠炎(n=6)

注:ΔΔ表示与AH组相比,P<0.01。

, figureFileSmall=72U0aYGVfTondVHb4pg6PA==, figureFileBig=MDLhhlwZWzzbaa49HdjbLw==, tableContent=null), ArticleFig(id=1320889709040087940, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=EN, label=Fig.4, caption=AS-IV activates AhR/IL-22 pathway in MNK-3 cells in vitro, figureFileSmall=mni5RCVBxEMB6r4ZbR0FfA==, figureFileBig=c1QNsLJJeQLaWiQ31OUxGQ==, tableContent=null), ArticleFig(id=1320889709136556933, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=CN, label=图4, caption=AS-IV体外激活MNK-3细胞中的AhR/IL-22通路, figureFileSmall=mni5RCVBxEMB6r4ZbR0FfA==, figureFileBig=c1QNsLJJeQLaWiQ31OUxGQ==, tableContent=null), ArticleFig(id=1320889709237220230, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=EN, label=Fig.5, caption=AS-IV induces IL-22 production in an AhR-dependent manner, figureFileSmall=A4N9STr/e186Sw0OuUxTRQ==, figureFileBig=ck+aBG5OIpQyq8BqJhKW+w==, tableContent=null), ArticleFig(id=1320889709312717703, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=CN, label=图5, caption=AS-IV以AhR依赖性方式诱导IL-22产生, figureFileSmall=A4N9STr/e186Sw0OuUxTRQ==, figureFileBig=ck+aBG5OIpQyq8BqJhKW+w==, tableContent=null), ArticleFig(id=1320889709384020872, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=EN, label=Fig.6, caption=AS-IV exerts protective effect on Caco-2 cells via IL-22, figureFileSmall=aZdOeUnDXU5nDky02YPKgw==, figureFileBig=t2PAAagCgp2O78jQ0vcKCQ==, tableContent=null), ArticleFig(id=1320889709455324041, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=CN, label=图6, caption=AS-IV通过IL-22发挥对Caco-2细胞的保护作用, figureFileSmall=aZdOeUnDXU5nDky02YPKgw==, figureFileBig=t2PAAagCgp2O78jQ0vcKCQ==, tableContent=null), ArticleFig(id=1320889709530821514, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=EN, label=Table 1, caption=

Primers used for qRT-PCR

, figureFileSmall=null, figureFileBig=null, tableContent=
引物序列
AHR 
Forward sequenceATGGAGAGGTGCTTCAGGTGCCG
Reverse sequenceATGGAGGGGTGGCTGAAGTGGAGT
CYP1A1 
Forward sequenceTCTGTGCCATTTGCTTTGGC
Reverse sequenceAGGCATTCAGGGAAGGGTTG
IL-22 
Forward sequenceCATGCAGGAGGTGGTACCTT
Reverse sequenceCAGACGCAAGCATTTCTCAG
GAPDH 
Forward sequence5ʹ- GGTTGTCTCCTGCGACTTCA-3ʹ
Reverse sequence5ʹ-TGGTCCAGGGTTTCTTACTCC-3ʹ
), ArticleFig(id=1320889709610513291, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889699464491829, language=CN, label=表1, caption=

用于qRT-PCR的引物序列

, figureFileSmall=null, figureFileBig=null, tableContent=
引物序列
AHR 
Forward sequenceATGGAGAGGTGCTTCAGGTGCCG
Reverse sequenceATGGAGGGGTGGCTGAAGTGGAGT
CYP1A1 
Forward sequenceTCTGTGCCATTTGCTTTGGC
Reverse sequenceAGGCATTCAGGGAAGGGTTG
IL-22 
Forward sequenceCATGCAGGAGGTGGTACCTT
Reverse sequenceCAGACGCAAGCATTTCTCAG
GAPDH 
Forward sequence5ʹ- GGTTGTCTCCTGCGACTTCA-3ʹ
Reverse sequence5ʹ-TGGTCCAGGGTTTCTTACTCC-3ʹ
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基于AhR/IL-22通路探讨黄芪甲苷对结肠炎小鼠肠道屏障功能的影响及机制
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周杰 1 , 任旭霞 1 , 苏岩 1 , 董右青 1 , 龙飞扬 1 , 牟易 1 , 余畅 1, 3, * , 袁在静 2, *
食品工业科技 | 营养与保健 2026,47(4): 425-434
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食品工业科技 |营养与保健 2026 , 47 (4) : 425 -434
基于AhR/IL-22通路探讨黄芪甲苷对结肠炎小鼠肠道屏障功能的影响及机制
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周杰1 , 任旭霞1, 苏岩1, 董右青1, 龙飞扬1, 牟易1, 余畅1, 3, * , 袁在静2, *
作者信息
  • 1重庆中医药学院基础医学院,重庆 402760
  • 2云南省昭通市第一人民医院,云南昭通 657000
  • 3重庆医科大学,重庆 400030
通讯作者:
余畅(1970−),女,博士,教授,研究方向:慢性代谢性疾病,E-mail:。
袁在静(1989−),女,本科,主治医师,研究方向:炎症性肠病,E-mail:。
作者简介:

周杰(1990−),女,博士,助理研究员,研究方向:膳食营养,E-mail:

Mechanistic Study of Astragaloside IV on Intestinal Barrier Function in Colitis Mice Through AhR/IL-22 Signaling Pathway
Jie ZHOU1 , Xuxia REN1, Yan SU1, Youqing DONG1, Feiyang LONG1, Yi MU1, Chang YU1, 3, * , Zaijing YUAN2, *
Affiliations
  • 1School of Basic Medicine Science, Chongqing University of Chinese Medicine, Chongqing 402760, China
  • 2Zhaotong First People's Hospital, Yunnan Province, Zhaotong 657000, China
  • 3Chongqing Medical University, Chongqing 400030, China
出版时间: 2026-02-15 doi: 10.13386/j.issn1002-0306.2025010184
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目的:研究黄芪甲苷 (Astragaloside IV,AS-IV)对溃疡性结肠炎(Ulcerative colitis,UC)小鼠肠道屏障功能的影响,并探讨其潜在机制。方法:使用3%葡聚糖硫酸钠(Dextran sulfate sodium,DSS)构建小鼠UC模型,建模成功后分为空白对照组、模型对照组、黄芪甲苷低、中、高剂量组(10、20、40 mg/kg),各组灌胃相应药物,每日1次,连续给药10 d。Western blotting检测AhR/IL-22通路的蛋白表达水平;荧光原位杂交技术检测结肠组织切片DAPI染色情况;流式细胞术检测细胞凋亡水平;qRT-PCR检测AHR、CYP1A1、IL-22等mRNA表达水平。结果:AS-IV可能通过促进AhR/IL-22通路改善结肠炎小鼠的肠道炎症状态,降低了肠道通透性,并促进了结肠紧密连接结构的修复。AhR拮抗剂CH223191可部分阻断AS-IV的治疗效果,而AhR激动剂FICZ可改善结肠炎小鼠的症状和肠道屏障功能。进一步的体外机制研究发现,AS-IV处理显著提高了MNK-3细胞中AhR下游靶蛋白CYP1A1的表达水平(P<0.01),并通过促进AhR核转位显著增强IL-22的分泌(P<0.01)。重要的是,在AhR基因沉默的MNK-3细胞(shAhR-MNK3)中,AS-IV对CYP1A1表达和IL-22分泌的促进作用被显著抑制(P<0.05),表明AS-IV通过AhR依赖性机制调控IL-22的产生。结论:AS-IV通过ILC3中的AhR/IL-22通路改善肠上皮屏障,改善结肠炎,从而为UC提供潜在的治疗方法。

AhR/IL-22  /  黄芪甲苷  /  溃疡性结肠炎  /  肠道屏障

Objective: To investigate the effects of Astragaloside IV (AS-IV) on intestinal barrier function in mice with ulcerative colitis (UC) and to explore its underlying mechanisms. Methods: The UC mouse model was established using 3% dextran sulfate sodium (DSS). Upon successful model establishment, the animals were divided into control, DSS model, and AS-IV treatment groups (10, 20 and 40 mg/kg). All treatments were administered via oral gavage once daily for 10 days. The protein expression levels of the AhR/IL-22 pathway were analyzed by Western blotting. Fluorescence in situ hybridization (FISH) was performed to examine DAPI staining patterns in colon tissue sections. Apoptosis rates were measured by flow cytometry, and transcriptional levels of AHR, CYP1A1, and IL-22 were evaluated using qRT-PCR. Results: AS-IV ameliorated intestinal inflammation, reduced intestinal permeability, and promoted the restoration of colonic tight junction structures in colitis mice, potentially through activation of the AhR/IL-22 pathway. The therapeutic effects of AS-IV were partially attenuated by the AhR antagonist CH223191, whereas the AhR agonist FICZ exhibited comparable protective effects on colitis symptoms and intestinal barrier function. In vitro mechanistic investigations demonstrated that AS-IV treatment significantly upregulated the expression of CYP1A1 (P<0.01), a downstream target protein of AhR, in MNK-3 cells. Furthermore, AS-IV markedly enhanced IL-22 secretion (P<0.01) by facilitating AhR nuclear translocation. Notably, these regulatory effects were substantially diminished in AhR-silenced MNK-3 cells (shAhR-MNK3) (P>0.05), conclusively establishing that AS-IV modulates IL-22 production through an AhR-dependent mechanism. Conclusion: AS-IV ameliorated UC by activating the AhR/IL-22 pathway in ILC3 cells, thereby restoring intestinal barrier function. These findings highlight AS-IV as a potential therapeutic candidate for UC treatment.

AhR/IL-22  /  astragaloside IV  /  ulcerative colitis  /  intestinal barrier
周杰, 任旭霞, 苏岩, 董右青, 龙飞扬, 牟易, 余畅, 袁在静. 基于AhR/IL-22通路探讨黄芪甲苷对结肠炎小鼠肠道屏障功能的影响及机制. 食品工业科技, 2026 , 47 (4) : 425 -434 . DOI: 10.13386/j.issn1002-0306.2025010184
Jie ZHOU, Xuxia REN, Yan SU, Youqing DONG, Feiyang LONG, Yi MU, Chang YU, Zaijing YUAN. Mechanistic Study of Astragaloside IV on Intestinal Barrier Function in Colitis Mice Through AhR/IL-22 Signaling Pathway[J]. Science and Technology of Food Industry, 2026 , 47 (4) : 425 -434 . DOI: 10.13386/j.issn1002-0306.2025010184
溃疡性结肠炎(Ulcerative colitis,UC)是一种以直肠为起始点并向近端结肠连续性扩展的慢性非特异性肠道炎症性疾病,其特征性病理改变为黏膜层局限性炎症浸润及上皮屏障损伤[1]。肠道屏障功能是评估UC患者的敏感预后指标[2],当肠道屏障被破坏时,肠腔微生物可穿透上皮层迁移至固有层,进而激活异常免疫应答并加剧炎症级联反应。因此,在UC的治疗中,除了给予抗生素和抗炎治疗外,修复受损的肠黏膜也至关重要[3−4]。白细胞介素22(Interleukin-22,IL-22)在肠上皮的再生和重建中发挥重要作用,主要通过促进肠道紧密连接来强化肠道屏障以及增加抗菌肽和粘蛋白来增强粘膜防御,因此上调IL-22表达对于上皮修复至关重要[5−6]。IL-22主要由辅助性T细胞(Th1、Th17和Th22细胞)、3型固有淋巴样细胞(ILC3)等产生,其中ILC3是其主要来源,并受芳烃受体(Aryl hydrocarbon receptor,AhR)调节[7]。作为配体依赖性转录因子,AhR在胞质中与分子伴侣蛋白形成复合体并保持非活性状态,当AhR与其激动剂结合后,AhR-配体复合体发生核转位,与外源性反应元件(Xenobiotic response elements,XRE)发生相互作用,进而启动对下游靶基因的转录调控过程。此外,AhR还通过与视黄醇相关孤儿受体γt(Retinoid-related orphan receptor γt,RORγt)相互协作,促进IL-22的基因表达,从而在肠黏膜修复过程中发挥核心调控作用[8]。
AhR在炎症性肠病(Inflammatory bowel disease,IBD)发病机制中的关键调控作用已得到广泛证实[9−11],研究表明,IBD患者炎症肠组织中的ILC3细胞的AhR表达显著降低。而AhR激动剂6-甲酰吲哚并[3,2-b]咔唑(FICZ)能够直接激活肠上皮细胞(Intestinal epithelial cells,IEC)AhR表达,有效降低肠道通透性,并发挥上皮细胞保护作用[12]。尽管AhR在调节肠道屏障功能方面扮演着至关重要的角色,然而,现有AhR激动剂普遍存在不同程度的毒性问题,严重制约其临床转化应用。因此,寻找安全有效的AhR激动剂已成为当前研究的迫切需求。黄芪甲苷(Astragaloside IV,AS-IV)作为传统中药黄芪的主要活性成分,具有抗炎、修复肠上皮等多种药理活性[13]。本研究通过体内DSS结肠炎模型结合AhR激动剂/拮抗剂干预、以及体外AhR基因沉默的ILC3细胞与肠上皮细胞共培养等实验,探究AS-IV在抵抗结肠炎方面的效果,并进一步分析AhR/IL-22信号通路是否以及如何参与AS-IV对肠道屏障的保护作用。
雄性C57BL/6小鼠(6~8周),体重20~22 g 湖南斯莱克景达实验动物有限公司(许可证号:SCXK(湘)2021-0002);MNK-3细胞 Bluefbio生物科技发展有限公司;黄芪甲苷(98%,HPC) 上海源叶生物科技有限公司;AhR激动剂FICZ(HY-12451)、AhR抑制剂的CH223191(A8609) 北京百奥莱博科技有限公司;DMEM培养基、胎牛血清(FBS,42F2362K) 赛默飞世尔科技中国有限公司;核蛋白提取试剂盒(R0050)、Luria-Bertani琼脂(L1015) 北京索莱宝科技有限公司;小鼠IL-22 ELISA试剂盒(EMC119) 深圳新生物科技公司;抗β-肌动蛋白抗体(BM0627) 武汉博士德生物科技有限公司;Foxp3/转录因子染色缓冲液组(00-5523-00)、PE抗小鼠RORγt抗体(2054914) 赛默飞世尔科技公司(美国);抗小鼠IgG(Alexa Fluor ® 488 Conjugate,4408) Cell Signaling Technology(美国);Cy3标记的羊抗大鼠IgG(A0507)、ZO-1、Occludin、AhR和细胞色素P450(CYP)1A1的抗体 碧云天生物科技有限公司。
CO2培养箱 美国Bio-Rad公司;qTower2.2荧光实时定量PCR仪 德国Anakytik Jena公司;iMark型酶标检测仪 德国Eppendorf公司;BD LSRFortessa流式细胞仪 美国BD公司。
MNK-3细胞使用含有10%胎牛血清(FBS)和1%青霉素-链霉素混合物的DMEM培养基进行常规培养(5% CO2,37 ℃)。MNK-3细胞进行如下5组处理:包括对照组、高中低三个剂量(20、10和5 μmol/L)AS-IV组及FICZ组(AhR激动剂,400 nmol/L),处理MNK-3细胞24 h。
雄性C57BL/6小鼠饲养在重庆中医药学院动物房,在标准温度(22±2 ℃)和湿度(55%±2%)下保持12 h光/暗循环。所有实验方案符合重庆中医药学院实验动物伦理委员会规定(动物福利伦理审查批文号:QT2024-01),并严格遵循动物伦理规定使用。将C57BL/6小鼠随机分组如下:空白对照组、模型组、AS-IV组(10、20和40 mg/kg)、FICZ组(1 μg/只)、CH223191(AhR抑制剂组,10 mg/kg)+AS-IV(40 mg/kg)(CH+AS-IV组)。除空白对照组外,其余各组小鼠自由饮用3% DSS,连续7 d。同时,空白对照组和模型组小鼠口服去离子水,AS-IV组小鼠口服含有AS-IV(10、20和40 mg/kg)的去离子水,FICZ组小鼠腹腔注射FICZ,CH+AS-IV组小鼠腹腔注射CH223191并灌胃AS-IV,连续10 d。第11 d,对所有小鼠实施安乐死。
小鼠处死后,分离小鼠的脾脏和肠系膜淋巴结(Mesenteric lymph nodes,MLN),于4 ℃下机械研磨1 min。将组织匀浆进行10倍系列梯度稀释,选取预期可产生30~300个孤立菌落的稀释度,取50~100 μL涂布于Luria-Bertani琼脂中,放入37 ℃培养,12 h后计算各组的细菌菌落数。
采用8%~12% SDS-PAGE电泳分离各处理组蛋白质样品,随后转印至PVDF膜。经5% BSA封闭后,分别与特异性一抗4 ℃孵育过夜(12 h),再与相应HRP标记的二抗(山羊抗鼠或兔抗山羊IgG)室温孵育1 h。使用ECL化学发光底物显色,β-actin作为内参进行归一化处理。所有实验均独立重复三次,使用Image J软件对蛋白条带灰度值进行定量分析。
所有小鼠禁食12 h后口服50 mg/kg FD4(4 kDa FITC-dextran),4 h后通过小动物成像系统观察其体内分布。采集外周血经离心(3000 r/min,4 ℃,10 min)后,参考以往研究[14],取100 μL血清使用荧光酶标仪(Ex/Em=480/520 nm)检测荧光强度。
结肠冰冻切片经丙酮固定20 min后,10%山羊血清封闭1.5 h,4 ℃下与抗ZO-1(1:100)和抗Occludin(1:250)一抗孵育过夜。随后与相应二抗(抗小鼠/大鼠IgG)避光室温孵育60 min,DAPI染核10 min,共聚焦显微镜观察。
参照以往研究[15]提取结肠固有层淋巴细胞,简言之,将结肠组织样本使用含有5%FBS、1 mmol/L DTT、5 mmmol/L EDTA和10 mmol/L HEPES的Hanks缓冲液预处理,20 min/次处理2次,每次消化后使用振荡仪振荡10 s弃上清;每管加入10 mL含有0.05%胶原酶II、10%FBS和100 μg/mL DNA酶的固有层消化液消化30 min;收集消化液,使用70 μmol/L细胞筛过滤后离心,使用Percoll缓冲液纯化后,收集细胞沉淀。结肠固有层淋巴细胞(1×105 cells/mL)于含10% FBS的DMEM中预培养6 h后,分别经不同浓度AS-IV处理24 h(5% CO2,37 ℃)。收集处理过的细胞并用预冷PBS洗涤后,然后将收集的细胞重新悬浮在结合缓冲液中,流式细胞术检测基因表达。
MNK-3细胞接种于含10% FBS的DMEM的48孔板。将不同浓度的GFP标记慢病毒与转染试剂混合转染12 h后继续培养72 h,通过流式细胞术检测荧光强度优化转染条件。转染细胞在含有合适浓度嘌呤霉素(杀死正常MNK-3细胞的最低浓度)的DMEM中培养进行纯化。
使用TRIzol试剂提取细胞总RNA。通过AG RNAex Pro RNA试剂提取MNK-3细胞的总RNA。然后,去除与总RNA混合的DNA,并通过Evo M-MLV反转录试剂盒Ⅱ将RNA反转录为cDNA。最后,将cDNA与引物和SYBR Green Pro Taq HS预混型qPCR试剂盒混合,并使用PCR仪进行扩增,具体参数参照以往研究[16]。以GAPDH为基准,并用2−ΔΔCT法计算。用于RT-qPCR的引物如表1所示:
所有数据均由至少三次独立实验计算得出,并以x±s表示;使用SPSS 20.0和GraphPad Prism 18.0分析实验数据;两组间比较采用t检验,多组间比较采用单因素方差分析;当P<0.05说明有统计学意义;P<0.01说明具有显著统计学差异。
为了验证AS-IV对UC的保护作用,对各处理组小鼠结肠进行病理学分析,结果如图1所示,与空白对照组相比,DSS模型组结肠组织炎症细胞增多、绒毛及隐窝结构受损。对结肠上皮细胞脱落、炎性细胞浸润、肌层广泛水肿以及病理组织进行评分(图1h),DSS模型组病理评分增加(P<0.001)。与DSS模型组相比,AS-IV干预能有效缓解结肠组织炎性状态、修复绒毛结构、降低病理学评分,而AhR抑制剂能显著逆转AS-IV的该效应。以上结果表明AS-IV能有效缓解DSS诱导结肠炎,且该效应与AhR有关。
细菌培养实验如图2a所示,与空白对照组相比,DSS诱导的结肠炎小鼠的MLN中培养出大量细菌。与DSS模型组相比,AS-IV干预后细菌复合显著降低。进一步使用免疫荧光检测小鼠结肠组织紧密连接蛋白的表达,结果如图2b所示,AS-IV明显上调DSS引起的ZO-1和occludin表达降低,且AS-IV还可以预防DSS引起的血清FITC-葡聚糖水平升高(图2c)。而AS-IV的上述效应被AhR抑制剂明显阻断。这表明AS-IV可以降低肠道通透性保护结肠炎小鼠的肠道屏障。
为深入探讨AS-IV对肠上皮保护作用的分子机制,本研究通过Western blot和ELISA技术检测了结肠炎小鼠模型肠道AhR/IL-22信号通路关键蛋白的表达水平。实验结果如图3所示,与对照组相比,结肠炎模型组小鼠AhR下游效应蛋白CYP1A1的表达水平及结肠组织IL-22含量均显著降低(P<0.05)。经AS-IV干预后,上述指标均呈现明显回升趋势(P<0.05)。这些结果表明,AS-IV可能通过特异性激活ILC3细胞中的AhR/IL-22信号通路,进而发挥其对结肠炎的治疗作用。
MNK-3细胞系是一种表达与ILC3相同的信号转录因子和细胞因子的小鼠淋巴细胞系,用于体外评估AS-IV对ILC3细胞AhR信号通路的调控作用。通过qRT-PCR分析发现,AS-IV处理虽未显著改变AhR mRNA的表达水平(P>0.05),但可显著上调AhR下游靶基因CYP1A1及IL-22的mRNA表达(P<0.05)(图4a~图4c)。且给予AS-IV后,AhR蛋白在细胞核中的表达增加,而在细胞质中的表达减少,这表明AS-IV促进了AhR向细胞核的易位(图4d)。此外,流式细胞术及Western blot检测结果证实,AS-IV处理显著提高了MNK-3细胞中CYP1A1及IL-22的蛋白表达水平(图4e~图4g)。综合上述结果,AS-IV可能通过激活AhR信号通路,促进其核转位,进而上调CYP1A1和IL-22的表达,表明AS-IV具有AhR激动剂样作用,并可调控MNK-3细胞中AhR/IL-22通路的活化。
本研究采用pLV shRNA载体系统,通过慢病毒转染将靶向AhR的shRNA高效递送至MNK-3细胞中。Western blot分析显示,携带AhR特异性序列1的慢病毒可显著抑制AhR蛋白表达(图5a),并成功构建了shAhR-MNK-3稳定转染细胞系。为进一步验证AS-IV激活的AhR是否主要促进IL-22的产生,使用AS-IV分别处理了MNK-3野生型细胞和shAhR-MNK-3细胞。Western blot及免疫荧光结果均显示,在野生型MNK-3细胞中,AS-IV与AhR激动剂FICZ均显著促进AhR的核转位(图5b、图5c),并促进IL-22分泌(图5d)。然而,在shAhR-MNK-3细胞中,AS-IV对AhR核转位及IL-22生成的促进作用被显著抑制。上述结果提示,AS-IV诱导的IL-22上调依赖于AhR的激活,进一步证实AhR在AS-IV介导的IL-22调控中起关键作用。
为探究ILC3在AS-IV介导的肠道屏障保护中的作用机制,本研究建立了一个由MNK-3(模拟ILC3功能)与Caco-2细胞共培养的体外肠道微环境模型。结果显示,40 μg/mL LPS处理显著增加Caco-2单层细胞的FITC-葡聚糖通透性(图6a),而25 ng/mL IL-22处理后显著降低LPS引起的通透性增加(图6b)。值得注意的是,经AS-IV处理的MNK-3细胞条件培养基能够有效逆转LPS诱导的Caco-2细胞通透性增加(图6c)。进一步分子机制研究表明,AS-IV处理的MNK-3细胞条件培养基可显著上调Caco-2细胞中紧密连接蛋白ZO-1和Occludin的表达(图6d),其作用结果与IL-22处理组一致。这些结果表明,AS-IV可能通过促进MNK-3细胞分泌IL-22,进而增强肠道上皮细胞紧密连接蛋白的表达,最终改善LPS诱导的肠道屏障功能障碍。
UC被认为是一种“屏障器官疾病”,目前临床上治疗UC的药物主要是5-氨基水杨酸(5-ASA)或糖皮质激素[17],但使用此类药物患者的复发率往往较高。因此亟需开发以改善肠道屏障为目的的新型药物[18]。在本研究中,证明来源于黄芪的AS-IV通过激活肠道ILC3的AhR/IL-22通路发挥对肠上皮细胞的保护作用。细菌易位主要指肠道细菌穿过上皮层到达固有层,然后迁移到其他组织的现象。在IBD患者中,细菌易位更可能是由于肠道屏障受损所致[19]。Liu等[20]研究发现粘液层的损失会导致微生物群粘附在上皮上,加速细菌易位的过程。由咬合蛋白(Occludin)和闭合蛋白(Claudin)组成的改变的紧密连接则会削弱屏障功能和上皮完整性[21]。本研究发现,AS-IV可以通过改善肠道屏障来减轻细菌浸润和易位。结肠炎小鼠结肠中的细菌浸润以及向MLN和脾脏的移位增加,而AS-IV减少了这种病理变化。此外,AS-IV可以调节肠上皮的紧密连接蛋白并修复功能失调的肠道屏障。
大量研究发现,ILC3和IL-22之间的相互作用对于肠道屏障功能和结构的调节至关重要,ILC3是肠道中IL-22的主要来源[22−25]。进一步假设AS-IV对上皮屏障的保护作用可能与ILC3、IL-22有关,结果发现AS-IV可以恢复结肠炎小鼠中IL-22/ILC3值和IL-22含量。Xiong等[26]研究发现AhR可能与RORγt结合促进IL-22基因转录。因此,推测AS-IV可以通过激活ILC3中的AhR直接增加IL-22的产生。本研究中AhR核转位和CYP1A1上调表明了AS-IV对AhR的激活作用。体内实验结果表明,结肠炎小鼠中CYP1A1蛋白表达显著降低。这可能是由于作为AhR配体的各种微生物来源的色氨酸代谢物,例如吲哚-3-乙酸、吲哚丙烯酸、吲哚-3-丙酸和色氨酸,在结肠炎的情况下受到损害。这些代谢物已被证明可以通过多种途径改善结肠炎[27]。进一步研究发现,AhR激动剂FICZ保护小鼠免受结肠炎的影响,而AhR拮抗剂CH223191则保留了AS-IV的积极作用,说明AS-IV的抗结肠炎作用是AhR依赖性的。与体内实验情况一致,AS-IV有效促进MNK-3细胞中AhR的核转位、增加CYP1A1表达并促进IL-22产生。相反,在shAhR-MNK3细胞中没有观察到上述效果,其中AhR表达被大幅降低,这说明AS-IV诱导的IL-22产生是AhR依赖性的。
在ILC3中,IL-22表达受到转录因子的共同调节,包括RORγt、AhR、信号转导子和转录激活子STAT3和STAT5[28−29]。STAT3和STAT5优先结合IL-22位点的STAT结合位点,并独立于AhR启动IL-22基因转录[15]。Ahlers等[30]研究发现,FICZ增强了Naïve CD4+T细胞中STAT3和STAT5的磷酸化。因此,推测FICZ通过促进STAT3和STAT5磷酸化并促进它们与IL-22启动子的结合来增强IL-22的转录和翻译,而不依赖于AhR途径。实验结果表明,FICZ可以显著增强shAhR-MNK3细胞对IL-22的分泌,这表明FICZ对MNK-3细胞的作用不仅仅由AhR介导。AhR是一种配体激活的转录因子,在各种免疫细胞中介导不同的作用。本研究发现,AS-IV可恢复ILC3中AhR激活后的IL-22平衡并修复受损的肠道屏障。
综上所述,本研究探讨了AS-IV可能通过AhR/IL-22通路改善肠道屏障功能的潜在机制。实验数据显示,AS-IV在DSS诱导的结肠炎模型中表现出缓解作用,其机制可能涉及促进AhR核转位、增强ILC3细胞IL-22分泌以及上调肠道上皮紧密连接蛋白表达等方面。这些发现与AhR激动剂在肠道保护方面的已有研究结果相呼应,并提示ILC3-上皮细胞互作可能是AS-IV发挥作用的潜在途径之一。研究结果为探索肠道炎症治疗新策略提供了实验依据,同时也为天然药物AS-IV的潜在临床应用提供了参考。然而,AS-IV与AhR的直接结合机制及其体内药效学特性仍需进一步验证。未来研究应着重于研究解析AS-IV与AhR的相互作用模式;AS-IV与其他疗法的协同效应。这些工作将推动AS-IV向临床转化,为炎症性肠病治疗提供新思路。

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doi: 10.13386/j.issn1002-0306.2025010184
  • 接收时间:2025-01-21
  • 首发时间:2026-10-24
  • 出版时间:2026-02-15
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    1重庆中医药学院基础医学院,重庆 402760
    2云南省昭通市第一人民医院,云南昭通 657000
    3重庆医科大学,重庆 400030

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余畅(1970−),女,博士,教授,研究方向:慢性代谢性疾病,E-mail:。
袁在静(1989−),女,本科,主治医师,研究方向:炎症性肠病,E-mail:。
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