基于网络药理学探究加味白头翁汤治疗溃疡性结肠炎的潜在机制

姜小雨 ,  汪海东 ,  郭金杰 ,  陈桂珍 ,  左守军 ,  栗亮亮 ,  宋鹏涛 ,  刘虎 ,  董海聚 ,  刘芳 ,  代宏宇

山西农业科学 ›› 2025, Vol. 53 ›› Issue (06) : 166 -175.

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山西农业科学 ›› 2025, Vol. 53 ›› Issue (06) : 166 -175. DOI: 10.26942/j.cnki.issn.1002-2481.2025.06.20
兽医学研究

基于网络药理学探究加味白头翁汤治疗溃疡性结肠炎的潜在机制

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Evaluation of the Potential Mechanism of Supplemented Pulsatilla Decoction in the Treatment of Ulcerative Colitis by Network Pharmacology Analysis

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摘要

为探究加味白头翁汤(SPD)治疗溃疡性结肠炎(UC)的潜在机制,采用网络药理学方法,从TCMSP、PubChem、Swiss Target Prediction和UniProt数据库筛选SPD的化学成分及作用靶点;利用Geencards、Disgenet及Ctd数据库获取UC相关靶点,通过比较分析确定SPD治疗UC的潜在作用靶点。进一步通过STRING、Cytoscape 3.8.2及DAVID进行靶点互作、网络构建和富集分析。结果显示,SPD含60种活性成分,匹配411个药物靶点;从3个数据库中分别筛选出5 027、1 460、18 098个UC相关靶点;经比较分析后,获得975个交集靶点可作为UC疾病靶点,进一步筛选确定SPD治疗UC的潜在靶点43个。STRING分析结果显示,Alb、IL-6、TNF、Caspase3、Egf、IL-10、Mmp9、Trp53、IfngMAPK14等为核心靶点;Cytoscape分析结果表明,槲皮素和木犀草素可能是SPD治疗UC的关键活性成分。GO富集分析结果显示,SPD通过调控基因表达等生物过程发挥作用;KEGG富集分析结果表明,SPD对UC的治疗作用涉及炎性肠炎、HIF-1信号通路、TNF信号通路及MAPK信号通路等。综上,SPD可能通过槲皮素、木犀草素作用于核心靶点,调控相关信号通路治疗UC。文章系统解析SPD治疗UC的成分—靶点—通路网络,明确了加味白头翁汤与原方的协同机制以及其核心成分、靶点及通路的特异性关联。

Abstract

To investigate the potential mechanism of supplemented pulsatilla decoction(SPD) in the treatment of ulcerative colitis(UC), in this study, a network pharmacology approach was employed. The chemical components and corresponding targets of SPD were screened from the TCMSP, PubChem, Swiss Target Prediction, and UniProt databases. UC-related targets were obtained from the GeneCards, DisGeNET, and Ctd databases, and the potential therapeutic targets of SPD for UC were identified through comparative analysis. Further analyses, including target interaction analysis, network construction, and enrichment analysis, were conducted using STRING, Cytoscape 3.8.2, and DAVID. The results showed that SPD contained 60 active components, which matched 411 drug targets. A total of 5 027, 1 460, and 18 098 UC-related targets were screened from the three databases, respectively. Through comparative analysis, 975 intersecting targets were identified as UC disease targets, and 43 potential targets of SPD for UC treatment were further screened and determined. STRING analysis revealed that Alb, IL-6, TNF, Caspase3, Egf, IL-10, Mmp9, Trp53, Ifng, and MAPK14 were core targets. Cytoscape analysis indicated that quercetin and luteolin might be the key active components of SPD in treating UC. GO enrichment analysis demonstrated that SPD exerted its effects by regulating the biological processes such as gene expression. KEGG analysis suggested that the therapeutic effect of SPD on UC involved inflammatory bowel disease, the HIF-1 signaling pathway, the TNF signaling pathway, and the MAPK signaling pathway, among others. In conclusion, SPD probably treated UC by acting on the core targets through quercetin and luteolin, thereby regulating related signaling pathways. In this article, the component-target-pathway network of SPD in UC treatment was systematically analyzed, the synergistic mechanism between SPD and the original decoction was clarified, and the specific associations between core components, targets, and pathways was identified.

Graphical abstract

关键词

网络药理学方法 / 加味白头翁汤 / 溃疡性结肠炎 / 靶点 / 通路网络

Key words

network pharmacology method / supplemented pulsatilla decoction / ulcerative colitis / target / pathway network

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姜小雨,汪海东,郭金杰,陈桂珍,左守军,栗亮亮,宋鹏涛,刘虎,董海聚,刘芳,代宏宇. 基于网络药理学探究加味白头翁汤治疗溃疡性结肠炎的潜在机制[J]. 山西农业科学, 2025, 53(06): 166-175 DOI:10.26942/j.cnki.issn.1002-2481.2025.06.20

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溃疡性结肠炎(Ulcerative colitis,UC)是一种慢性非特异性肠道炎症性疾病,以病程较长、复发率高为特点,临床表现为腹泻、腹痛,严重时出现血便[1]。其病理特征为结肠黏膜层和黏膜下层的连续性炎症,多始于直肠,逐渐蔓延至全结肠[2]。近年来,UC的发病率持续攀升,已成为常见的肠道疾病[3]。目前,临床治疗UC的主要药物存在依从性差、副作用显著等问题,严重时甚至危及生命[4]。因此,探索安全有效且副作用小的治疗方案,对人类健康以及动物健康均具有重要意义。中药因具备改善机体状态、调节免疫功能、毒副作用小等优点,在疾病防治中应用广泛[5]。白头翁汤作为治疗UC的经典复方,已在动物试验和临床应用中证实了其疗效[6],其主要通过调节肠道免疫环境、改善肠道微生态、保护黏膜屏障功能等机制发挥作用[7],其主要成分白头翁皂苷可通过抑制IL-1β、IL-6和TNF-α等促炎因子水平,减轻葡聚糖硫酸钠(DSS)诱导的UC损伤[8]。高彦明等[9]、雷彪等[10]和陈艾丽等[11]通过观察白头翁汤治疗大肠湿热型UC患者病例,发现白头翁汤对大肠湿热型UC有较好的治疗效果。然而,单一白头翁汤目前存在药效起效慢的问题,在应对复杂病理状态(如肠道屏障严重受损、免疫失衡持续存在)时,应用仍有局限12]。从作用机制来看,单一白头翁汤(核心成分如白头翁皂苷以抗炎为主)虽能调控TNF信号通路及部分促炎因子[13],但难以覆盖肠道屏障损伤—免疫失衡—局部缺氧的复杂病理链条[14]。马齿苋作为兼具多种生物活性的中药,具有抗菌、抗炎、抗氧化、调节肠道稳态等作用[15-16],其含有的马齿苋多糖(POP)可通过调节肠道稳态缓解DSS诱导的UC病理症状[17],提取物还能在结肠炎小鼠模型中发挥免疫调节作用[18]。但单一马齿苋(核心成分如槲皮素、木犀草素以抗氧化、免疫调节为主)虽可调节肠道稳态与免疫,却在抑制急性炎症放大、改善肠黏膜缺氧微环境方面作用较弱,导致其在重症UC或慢性复发期的疗效不佳[19]
从中医理论看,《景岳全书・痢疾》中记载UC属痢疾、肠澼范畴,核心病机为湿热蕴结肠道,气血壅滞,脉络受损。白头翁汤中,白头翁清热解毒、凉血止痢为君,黄连、黄柏清热燥湿为臣,秦皮收涩止痢为佐使,共同发挥清湿热、止痢痛的疗效,但针对湿热久羁、肠络损伤的重症UC,其凉血止血、修复肠络的疗效稍逊。马齿苋性味酸寒,归肝、大肠经,《本草纲目》载其具有散血消肿,利肠滑胎,解毒通淋的功效,既能助君药增强清热解毒之功,又能通过酸敛特性止血护络,契合UC湿热痢兼见便血的病机特点[20]。马齿苋与白头翁汤(清热解毒、凉血止痢)[21]配伍,符合“君臣佐使”理论中“佐药助君、增效减毒”的原则,可增强清利肠道湿热的作用,形成清湿热—止痢痛—护肠络的协同作用链,契合UC湿热痢的病机治疗原则[22]
白头翁和马齿苋的核心成分功效各有侧重,或因清热凉血有余而利湿不足,或因利湿止痢尚可而清热凉血欠缺,均无法形成抗炎—抗氧化—屏障修复的协同效应,难以全面应对UC的多环节病理机制。相比之下,加味白头翁汤(Supplemented pulsatilla decoction,SPD)通过白头翁汤与马齿苋的配伍,可弥补单一方剂的缺陷,形成更全面的治疗体系。但二者配伍后的协同作用机制尚未明确。
本研究在经典白头翁汤基础上加入马齿苋形成加味白头翁汤,通过网络药理学筛选其治疗UC的核心成分—潜在靶点—通路,旨在为中药复方“君臣佐使”配伍的现代生物学阐释提供参考,并为SPD治疗UC的临床应用奠定理论基础。

1 材料和方法

1.1 SPD活性成分及靶点预测

在TCMSP数据库(https://old.tcmsp-e.com/tcmsp.php)中分别输入马齿苋、白头翁、黄连、黄柏、秦皮进行检索,以口服生物利用度(Oral bioavailability,OB)≥30%和药物相似性(Drug-likeness,DL)≥0.18为条件筛选化学成分及对应蛋白靶点;对满足上述筛选条件但无对应靶点的成分使用PubChem网站(https://pubchem.ncbi.nlm.nih.gov/)对其进行结构查找,根据结构式使用Swiss target prediction网站(http://swisstargetprediction.ch/)进行靶点预测,使用UniProt网站(https://uniprot.org/)将各化学成分靶点匹配其对应基因名称,使蛋白质靶点信息标准化。

1.2 溃疡性结肠炎疾病靶点及药物—疾病交集靶点获取

利用Geencards(http://www.genecards.org/)、Disgenet(https://www.disgenet.org/search)及Ctd(http://ctdbase.org/)数据库,以“Ulcerative colitis”为关键词分别对其所收纳的疾病靶点进行查找,将各数据库得到的疾病相关基因通过Venn 2.1.0软件进行构图,获取交集靶点作为该疾病的靶点。以同样的方法使用Venn 2.1.0对药物预测潜在靶点与疾病相关靶点取交集,获得SPD对UC的潜在作用靶点。

1.3 交集靶点互作关系构建

将交集靶点输入到STRING网站(https://cn.string-db.org/)中的Multiple proteins选项中,进行各蛋白互作紧密程度分析,物种设置为Mus musculus,最低相互作用阈值设为高置信度High confidence(0.7),即获得蛋白互作关系图,结果以TSV格式导出并进行分析计算,提取网络中得分较高的节点,取前10个互作频次最高的靶点为关键作用靶点,在微生信平台(https://www.bioinformatics.com.cn/plot_basic_cluster_heatmap_plot_024)对关键靶点进行作图分析。

1.4 中药调控网络及蛋白质相互作用网络构建

将加味白头翁SPD的主要活性成分与潜在靶点导入Cytoscape 3.8.2软件中,基于介数中心性、接近中心性、度中心性和特征向量中心性等网络参数分析该网络的拓扑,并绘制中药—活性成分—潜在靶点网络图。

1.5 GO功能及KEGG通路富集分析

在DAVID(https://david.ncifcrf.gov/tools.jsp)网站内输入交集靶点,选择标识符OFFICIAL-GENE-SYMBOL,物种选择Mus musculus,提交获得功能分析工具,下载GO和KEGG通路进行富集分析。根据基因富集度分析,在微生信平台内构建KEGG气泡图和GO富集分析图。

2 结果与分析

2.1 SPD活性成分和交集靶点分析

在OB≥30%、DL≥0.18和小鼠为对象的条件下,5种SPD成分在TCMSP数据库中共检索出75种成分,其中,马齿苋10种、白头翁11种、黄连14种、黄柏37种、秦皮3种。去除重复项后获得60种活性成分(表1)。这些成分在TCMSP数据库共匹配到411个药物靶点,其中,马齿苋222个、白头翁332个、黄连286个、黄柏380个、秦皮12个。然后使用Geencards、Disgenet及Ctd数据库分别富集到5 027、1 460、18 098个疾病靶点,通过比较分析,获得975个交集靶点作为疾病靶点(图1-A)。再取疾病靶点与SPD靶点交集,共获得43个靶点(图1-B),即为SPD治疗UC的潜在靶点。

2.2 交集靶点互作关系及核心靶点筛选

将交集靶点导入STRING进行蛋白质互作网络分析(图2-A),将结果导出后,取互作频次最高的前10个蛋白,筛选出SPD治疗UC的核心靶点为:Alb、IL-6、TNF、Caspase3、Egf、IL-10、Mmp9、Trp53、Ifng和MAPK14(图2-B)。

2.3 SPD与UC交集靶点互作关系

将药物与疾病的交集靶点和药物的活性成分导入Cytoscape软件,构建SPD与UC之间的成分—靶点—通路网络(图3)。其中,槲皮素(Quercetin)和木犀草素(Luteolin)具有最高的连接性,其度数值分别为30和20,可能在治疗UC中发挥关键作用。

2.4 GO和KEGG富集分析

为了进一步研究SPD抗UC作用的机制,使用DAVID网站进行GO功能和KEGG通路分析。选取P值最小的前10个GO条目从生物过程(Biological process,BP)、细胞成分(Cellular component,CC)和分子功能(Molecular function,MF)3个方面进行分析(图4)。在BP项目中,SPD的抗UC作用主要集中在基因表达正调控、对药物的反应、细胞凋亡过程的正、负调控、细胞凋亡过程、DNA模板化、衰老、细胞增殖调控和蛋白质磷酸化的调控。MF项目主要包括蛋白结合、金属离子结合、酶结合、锌离子结合、细胞因子活性、大分子配合物结合、水解酶活性、蛋白质同源二聚体活性和蛋白酶的结合。CC项目主要包括细胞外、细胞质、细胞核、线粒体等,表明药物治疗的途径能在膜表面、胞质内、细胞核及线粒体等多个部位进行。

KEGG途径分析中选取前20个通路进行分析,结果发现(图5),与UC有关的通路主要包括癌症通路、糖尿病并发症中的AGE-RAGE信号通路、脂质与动脉粥样硬化、疟疾、锥虫病、弓形虫病、乙肝、结核病、炎性肠病、HIF-1信号通路、TNF信号通路、Mark信号通路等。其中,炎性相关通路TNF、Mark得到富集,表明其可能在SPD治疗UC中发挥重要作用。

3 结论与讨论

溃疡性结肠炎是炎性肠病的一种,目前尚无特效的治疗手段,只能通过缓解症状来改善生活质量。因此,探究能有效治疗UC的药物对于临床治疗来说是当务之急。网络药理学技术是基于疾病—药物—交集靶点—相关通路的方式进行研究,其可揭示药物在治疗疾病中涉及的可能靶点及靶点间的互作关系,从而为解决医学上复杂疾病和新药的探索提供理论支持[23]。本研究利用网络药理学技术初步分析了加味白头翁汤治疗UC的潜在机制,揭示了SPD通过多靶点协同调控UC的优势。

SPD是一种重要复方,具有多靶点治疗的特点,而UC的发生也受多种因素的调节。本研究利用网络药理学药物和疾病靶点交互作用分析,预测出了10种SPD和UC交互作用的核心靶点Alb、IL-6、TNF、Caspase3、Egf、IL-10、Mmp9、Trp53、Ifng和MAPK14。Alb是反映肠道吸收功能和营养状态的关键指标[24]。古丽不斯旦·吾守尔等[23]通过收集UC患者和健康体检者病例,发现UC患者因结肠黏膜损伤导致Alb合成减少,且并发营养不良,其水平与疾病活动度负相关。本研究发现,SPD对UC诱导的Alb水平变化具有调节作用,表明SPD可能有助于缓解UC患者全身营养失衡的状态,其机制可能与白头翁汤修复黏膜屏障[25]和马齿苋调节肠道稳态[26]有关。IL-6、TNF作为促炎因子网络的核心,在UC活动期显著升高[27-28]。张锦鹏等[29]也通过对代谢性、肿瘤等多种疾病的研究发现,IL-6、TNF可通过激活NF-κB等通路放大炎症反应。MAPK14在细胞信号传导中具有重要作用,其可参与炎症、衰老、分化、细胞凋亡、增殖等多种生物学过程[30]。ZHENG等[31]通过研究中医治疗UC的机制发现,治疗UC的经典方剂如清肝利肠汤和左金丸可以通过调节MAPK等信号通路缓解UC导致的结肠损伤。本研究发现,SPD可调节UC引起的MAPK14表达的变化,其机制可能与槲皮素抑制MAPK通路活性相关[32]。Ifng是Th1型免疫应答的核心细胞因子,FOUAD等[33]通过乙酸诱导小鼠UC模型,发现维格列汀(Vilda)可以通过降低Ifng在UC中过度表达调节免疫失衡,缓解UC症状。本研究发现,SPD可调节UC引起的Ifng表达变化,其机制可能与马齿苋中木犀草素调节Th1/Th2平衡的作用相关[34]。IL-10是一种抗炎因子,具有维持肠道免疫平衡的作用[35],这种平衡是缓解UC肠道稳态紊乱的关键。袁力等[36]研究发现,木犀草素可通过上调IL-10水平缓解葡聚糖硫酸钠(DSS)诱导小鼠溃疡性结肠炎。本研究发现,SPD可调节UC引起IL-10表达的变化,这种调节作用可能与SPD中活性成分木犀草素的免疫调节作用相关。Caspase3是细胞凋亡的执行蛋白,王倩等[37]研究发现,其过度激活会导致UC患者结肠黏膜上皮细胞异常死亡,导致肠黏膜修复障碍[37];Egf是上皮修复的关键因子,WANG等[38]研究发现,贻贝类黏附的热敏水凝胶可通过巨噬细胞极化增强Egf对2,4,6-三硝基苯磺酸(TNBS)诱导的UC大鼠结肠黏膜屏障的非纤维化修复作用。Caspase3和Egf的平衡调控是黏膜愈合的关键。本研究发现,SPD对Caspase3和Egf有潜在的调节作用,且GO富集分析结果也显示,SPD对细胞凋亡过程有潜在的调节作用,表明SPD可能通过调节UC诱发的黏膜“破坏>修复”的病理失衡状态,改善UC导致的结肠黏膜损伤。Mmp9是一种基质金属蛋白酶,薛永举[14]研究发现,Mmp9过度激活时会通过降解结肠黏膜基质破坏UC患者的结肠黏膜屏障发挥作用。本研究发现,SPD对Mmp9有潜在的调节作用。Trp53是小鼠体内与人类Tp53基因相对应的同源基因,具有重要的肿瘤抑制功能。TANG等[39]通过基因工程小鼠构建人类结直肠癌(CRC)模型,比较了常见的人类癌,发现Trp53功能异常可能参与UC向结肠癌转变。本研究发现,SPD对Trp53有潜在的调节作用。上述靶点共同构成UC病理链炎症发作—细胞异常死亡—肠道屏障受损的核心[40]。本研究发现,SPD对上述靶点具有调控作用,这既体现了SPD对UC发生关键环节的精准干预,又符合中药整体调节的特点。

本研究通过网络药理学发现,槲皮素和木犀草素是SPD的核心活性成分,与其他核心靶点交互频次最高,这些活性成分是复方优势的物质基础。李钦等[41]通过醋酸诱导大鼠UC模型发现,槲皮苷通过降低结肠黏膜MDA及MPO水平减轻UC损伤。李越[42]通过DSS诱导的小鼠UC模型,发现木犀草素通过抑制TNF-α、IL-6等促炎因子表达和上调IL-10表达,增强免疫保护作用,从而缓解UC损伤。槲皮素强大的抗氧化能力[43]与木犀草素的免疫调节功能[44]在SPD中通过协同作用于TNF、MAPK等靶点,形成抗氧化—抗炎的协同网络,弥补了单纯白头翁汤(侧重抗炎)或马齿苋(侧重免疫调节)的局限性。白头翁汤虽能调控TNF通路[13],但对氧化应激的干预较弱;马齿苋虽含槲皮素等抗氧化成分[17],却在抑制急性炎症放大方面作用有限[19]。表明槲皮素和木犀草素可能是SPD对UC潜在治疗作用的核心成分。

为进一步分析SPD调控UC的潜在机制,本研究进行了KEGG富集分析,结果显示,SPD可调控UC引起的TNF-α、MAPK及HIF-1信号通路的变化。其中,TNF通路是UC炎症放大的核心通路[45],ZHANG等[46]通过葡聚糖硫酸钠(DSS)诱导的小鼠UC模型,发现白头翁橄榄烷型皂苷可以通过抑制TNF-α信号通路减少下游炎症因子释放,从而改善体内肠上皮细胞屏障和肠道菌群来缓解UC症状。WANG等[47]通过DSS诱导的小鼠UC模型,发现Harvey大鼠肉瘤病毒癌基因同源物沉默(HRas沉默)可以抑制MAPK通路活化,恢复UC中的Treg/Th17细胞平衡,减轻UC黏膜损伤。HIF-1是低氧适应和病理反应中一个特异的中介因子。胡来明等[48]通过测定UC患者和健康体检者结肠组织中HIF-1α、iNOS的表达及与疾病活动性的关系,发现Hif-1α、iNOS的表达与UC患者疾病活动度呈正相关。本研究发现,SPD可调控UC引起的TNF-α、MAPK及HIF-1信号通路的变化,表明SPD可通过调控炎症、免疫、氧化应激等多种生物过程调节UC症状。

本研究利用网络药理学技术系统解析了SPD治疗UC的多成分—多靶点—多通路潜在机制。SPD可能主要是通过槲皮素、木犀草素,作用于Alb、IL-6、TNF、Caspase3、Egf、IL-10、Mmp9、Trp53、Ifng和MAPK14等关键靶点调控TNF-α、MAPK及HIF-1等多个信号通路来对UC进行治疗。但网络药理学结果仅为预测,仍需进一步试验验证。

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基金资助

“十四五”国家重点研发计划子课题(2023YFD1801304-8)

河南省高等学校重点科研项目(24A230010)

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