大黄素防治慢性肝病作用机制的研究现状

陈雅洁 ,  王昕 ,  武云娟 ,  苏莹 ,  王钰涵 ,  张金雪 ,  姚凝 ,  秦英 ,  左小宁

临床肝胆病杂志 ›› 2026, Vol. 42 ›› Issue (01) : 228 -234.

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临床肝胆病杂志 ›› 2026, Vol. 42 ›› Issue (01) : 228 -234. DOI: 10.12449/JCH260130
综述

大黄素防治慢性肝病作用机制的研究现状

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Current status of research on the mechanism of action of emodin in the prevention and treatment of chronic liver diseases

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摘要

慢性肝病是指肝脏因长期受到各种损伤,出现持续时间超过6个月且不可逆性病理改变的疾病。大黄素(EMO)是一种来源于大黄的天然蒽醌衍生物,其药理作用已被广泛研究,表现出多种生物特性并涉及多个信号分子和途径。目前针对慢性肝病的治疗方案以西药或手术治疗为主,由于副作用、高成本等多种原因,治疗推进受限。EMO因其天然来源和疗效,在治疗慢性肝病方面具有独特的优势,现已成为研究热点。本文通过总结梳理EMO对慢性肝病的治疗作用并探讨其机制,以期为慢性肝病的中医药治疗与临床药物研发提供一定的科学依据。

Abstract

Chronic liver diseases are a group of diseases in which the liver is subjected to a variety of injuries over a long period of time, resulting in irreversible pathological changes that last longer than 6 months. Emodin (EMO) is a natural anthraquinone derivative derived from Rheum officinale, and its pharmacological effect has been extensively studied, exhibiting a variety of biological properties and involving multiple signaling molecules and pathways. Western medicine or surgical treatment is currently the main treatment regimen for chronic liver diseases, and the advance in treatment is limited by various reasons such as side effects and high costs. Due to its natural origin and efficacy, EMO has unique advantages in the treatment of chronic liver diseases and has now become a research hotspot. This article summarizes the therapeutic effect of EMO on chronic liver diseases and its mechanism, in order to provide a certain scientific basis for the traditional Chinese medicine treatment of chronic liver diseases and the development of drugs in clinical practice.

Graphical abstract

关键词

大黄素 / 肝疾病 / 信号传导

Key words

Emodin / Liver Diseases / Signal Transduction

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陈雅洁,王昕,武云娟,苏莹,王钰涵,张金雪,姚凝,秦英,左小宁. 大黄素防治慢性肝病作用机制的研究现状[J]. 临床肝胆病杂志, 2026, 42(01): 228-234 DOI:10.12449/JCH260130

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慢性肝病是一类以肝脏长期炎症、坏死和纤维化为特征的疾病,是导致慢性疾病死亡的主要原因之一,占全球死亡人数的4%1。慢性肝病具有多种发病原因,包括酗酒、肥胖、代谢疾病、病毒性肝炎和自身免疫异常等2。其中,脂质代谢异常是最主要因素,其引发的代谢相关脂肪性肝病(metabolic associated fatty liver disease,MAFLD)是慢性肝病发生发展的起始,加之与胰岛素抵抗、促炎与抑炎的失衡、氧化应激及不同程度的肝纤维化等因素相互作用,可进一步发展为肝硬化、肝衰竭,最终发展为肝癌。
大黄素(emodin,EMO)是一种从中药大黄中提取的天然蒽醌类化合物,在蓼科、豆科和鼠李科等植物科(包括虎杖、何首乌、决明子)中含量丰富,具有广泛的药理作用3。既往研究表明,EMO具有保肝作用,在治疗慢性肝病的作用机制中表现出多种生物学特性,涉及多个信号分子和途径,可用于治疗不同阶段的肝脏疾病,包括肝炎、脂肪肝、肝纤维化、肝硬化和肝癌4-6。本文系统梳理EMO对于慢性肝病的治疗作用,并探讨其机制(图1),以期为慢性肝病的中医药治疗与临床药物研发提供一定的科学依据。

1 EMO治疗慢性肝病的作用机制

1.1 抗炎

核因子κB(nuclear factor-κB,NF-κB)信号通路是参与炎症调控的经典通路之一。NF-κB是生产和释放多种炎症细胞的关键转录因子,EMO可降低其活性,从而抑制白细胞介素(interleukin,IL)-1β、IL-6、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)等促炎因子的产生7。IκB激酶是IκBα降解的催化剂,IκBα是该通路的关键负调节因子。EMO通过抑制IκB激酶 β亚基活性,进而抑制IκBα降解,防止NF-κB入核8。p65/p50复合体是NF-κB核转录因子的主要形式,EMO可抑制其形成,导致NF-κB入核的数量减少,从而抑制基因转录9

含pyrin结构域(pyrin domain,PYD)的NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3,NLRP3)炎症小体是先天免疫系统的关键组成部分。NF-κB介导pro-IL-1β、pro-IL-18和NLRP3转录上调后激活炎性小体。EMO可抑制NLRP3活化,阻断第一步过程10。作为炎性小体组装的关键步骤,PYD相互作用促进NLRP3寡聚化、凋亡相关斑点样蛋白斑点形成和半胱氨酸天冬氨酸酶-1激活,EMO可选择性地破坏凋亡相关斑点样蛋白聚合和炎性小体组装,并间接抑制半胱氨酸天冬氨酸酶-1活化,完成对NLRP3的第二步阻断11

丝裂原活化蛋白激酶(mitogen-aktivierter protein kinase,MAPK)信号通路同样参与炎症反应。其中,p38丝裂原活化蛋白激酶(p38 mitogen-activated protein kinase,p38)/c-Jun氨基末端激酶(c-Jun N-terminal kinase,JNK)统称为应激激活蛋白激酶,核心调控炎症反应。EMO可直接阻断p38/JNK磷酸化以抑制MAPK信号通路,减轻炎症反应12

1.2 调控脂质代谢

腺苷酸活化蛋白激酶(adenosine monophosphate-activated protein kinase,AMPK)信号通路在脂质代谢调控中发挥关键作用。AMPK是参与调节脂质代谢和三磷酸腺苷平衡的“能量传感器”,其关键上游激酶肝脏激酶B1可被EMO激活,进而提高三磷酸腺苷水平及AMPK活性。乙酰辅酶A羧化酶(acetyl-CoA carboxylase,ACC)是AMPK的主要下游底物,EMO降低可其表达水平,减少脂肪酸的生物合成13

固醇调节元件结合蛋白1(sterol regulatory element-binding protein 1,SREBP1)为脂质稳态调控的核心转录因子,EMO可显著降低其表达,抑制脂肪酸合成酶(fatty acid synthase,FASN)、ACC水平14

过氧化物酶体增殖物激活受体α(peroxisome proliferator-activated receptor α,PPARα)信号通路是调控脂质代谢的核心环节。肉碱脂酰转移酶-1(carnitine palmitoyltransferase 1,CPT-1)是参与脂肪酸氧化的关键酶,酰基辅酶A氧化酶1(acyl-CoA oxidase 1,ACOX1)主要调控脂质代谢,PPARα通路激活后可调控下游CPT-1、ACOX1等表达,EMO可显著增加PPARα、CPT1A和ACOX1的水平13

以上三者协同作用,AMPK可磷酸化SREBP1与PPARα,EMO增强AMPK磷酸化程度,抑制SREBP1,增强PPARα活性,达成脂质“合成-分解”平衡15

1.3 抗肝纤维化

转化生长因子(transforming growth factor,TGF)-β信号通路与肝纤维化关系密切。TGF-β具有双重调控功能:一方面,叉头框蛋白P3(forkhead box P3,Foxp3)表达是调节性T细胞(regulatory T,Treg)分化和功能的核心标志,TGF-β通过Smad2/3直接结合Foxp3促进Treg分化,EMO可调控TGF-β/Smad3通路,增强Foxp3水平,改变Treg细胞比例,影响免疫反应。另一方面,TGF-β1是肝纤维化的核心驱动因子,可刺激静息态肝星状细胞(hepatic stellate cell,HSC)转化为肌成纤维细胞(myofibroblast,MFB),诱导细胞外基质(extracellular matrix,ECM)分泌,EMO可下调TGF-β1/Smad通路表达,减少ECM合成进而抑制HSC增殖和迁移16

血小板衍生生长因子(PDGF)作为促肝纤维化因子,不仅可直接刺激HSC分裂、增殖及向MFB转化,还可上调基质金属蛋白酶抑制剂-1表达,减少ECM降解,促进肝纤维化进程。EMO可直接降低PDGF水平,下调基质金属蛋白酶抑制剂-1表达,加速ECM降解,从而起到抗肝纤维化的作用17

上皮间质转化(epithelial-mesenchymal transition,EMT)是MFB的来源,并促进ECM沉积。TGF-β1是EMT的“主开关”,可诱导EMT发生形成新的MFB,并进一步分泌TGF-β1,形成“损伤-EMT-MFB活化-更多损伤”的循环,加剧肝纤维化。EMO可减少TGF-β1对EMT(包括TGF-β1本身)的上调,阻断上述循环以抗肝纤维化18

1.4 抑制肿瘤细胞增殖

Wnt/β-连环蛋白(β-catenin)信号通路具有调节肝脏稳态和抗肿瘤的作用。Wnt配体是该通路的调控枢纽,β-catenin为核心效应分子。在该通路激活状态下,Wnt配体受体结合,促使降解复合物解体,β-catenin免于磷酸化后入核并启动下游靶基因,如细胞周期蛋白D1。EMO可抑制Wnt和β-catenin核转位,阻断细胞周期蛋白D1表达,降低Wnt/β-catenin通路表达水平,抑制肿瘤细胞增殖,诱导细胞凋亡19

2 EMO对慢性肝病治疗作用的研究

目前,慢性肝病的治疗方案仍以西药或手术治疗为主,然而其副作用显著、治疗成本高及术后并发症发生率高等问题不容忽视,这些问题在一定程度上限制了该类治疗方案的发展。相比之下,EMO因其多靶点、多维度的特点,在治疗慢性肝病方面具有独特优势。

2.1 脂肪肝

2.1.1 脂肪肝的治疗现状

脂肪肝是一种复杂的、多病因导致的病理过程,以肝细胞脂肪变性为主要特征20,分为MAFLD和酒精性脂肪肝21。随着发病率逐年增加,MAFLD已然成为引起慢性肝病的最主要原因22,目前,尚未批准用于脂肪肝广泛治疗的确定性药物,尽管美国食品药品监督管理局于2024年3月批准了Rezdiffra(活性成分为resmetirom)用于治疗代谢相关性脂肪性肝炎,但仅限于非肝硬化的成年代谢相关性脂肪性肝炎伴2期/3期纤维化患者,同时需结合运动和饮食。因此,临床仍需积极探索更为理想的治疗药物23

2.1.2 EMO对脂肪肝的治疗作用

Shen等24研究显示,在高脂饮食诱导的野生型和Nr1h4基因敲除小鼠模型中,80 mg/kg EMO不仅可显著降低血清甘油三酯、总胆固醇、丙氨酸氨基转移酶和天冬氨酸氨基转移酶水平,并一定程度抑制小鼠体重增加,预防高脂饮食引起的肝损伤;还可通过激活法尼酯X受体/SREBP1c通路,显著改善小鼠肝脏的脂质沉积,调节肝脂肪变性、葡萄糖耐量和胰岛素敏感性,并部分抑制高脂饮食诱导的炎症和氧化应激。Li等25将SD大鼠分为对照组、果糖喂养组以及EMO干预的低、中、高剂量(40、80和160 mg/kg)果糖喂养组。结果显示,中、高剂量时,EMO可显著减少果糖喂养大鼠的肝脏脂质积累,与其他两组相比,EMO处理后明显下调了大鼠肝脏中SREBP1c的mRNA水平,降低了葡萄糖调控蛋白78、磷酸化蛋白激酶R样内质网激酶、磷酸化真核翻译起始因子2α亚基、X盒结合蛋白1的表达,表明EMO能够通过内质网应激SREBP1c通路改善果糖诱导的非酒精性脂肪性肝病的脂质积累。Huang等26研究表明,EMO可通过MAPK通路下调p38、pERK1/2表达,并通过AMPK通路下调SREBP1c、ACC1、FASN和ATP柠檬酸裂解酶水平,减少小鼠肝脏的脂滴积累。

2.2 肝硬化

2.2.1 肝硬化的治疗现状

“多重打击假说”指出,多种损伤因素共同作用引起肝脂肪变性,诱发肝细胞损伤和炎症反应,导致脂肪肝发生。随着肝脏免疫微环境炎症反应进行性激活,HSC增殖与活化失控,导致大量ECM沉积,形成肝脏瘢痕组织,此时进入肝纤维化阶段;纤维化相关的再生生态位重塑异常,导致肝细胞增殖与分化受阻,肝脏有效再生能力逐渐丧失,最终发展为肝硬化27

当前,肝硬化的唯一治疗手段是原位肝移植。然而,由于全球范围内肝移植的需求量远大于可接受供体肝脏的可用量,同时受限于高投入成本、免疫排斥风险及术后并发症等原因,临床亟需寻找新的有效且实用的肝移植替代治疗方案28-29。近期,干细胞移植30及粪菌移植31-32等新兴疗法在肝硬化治疗研究中表现出良好的应用潜力。

2.2.2 EMO对肝硬化的治疗作用

体内实验中,Guo等33首创了EMO联合汉防己甲素的脂质纳米递送系统(E-T/LNPs)。研究结果显示,E-T/LNPs不仅降低了小鼠和斑马鱼的天冬氨酸氨基转移酶、丙氨酸氨基转移酶、Ⅲ型前胶原、Ⅳ型胶原、层粘连蛋白、透明质酸的表达水平,还下调了IL-1β和TGF-β的表达;同时,20 mg/kg的E-T/LNPs可以恢复肝脏的生理功能,并缓解四氯化碳诱导的肝纤维化。Ma等34研究显示,在四氯化碳-玉米油溶液诱导的肝硬化SD大鼠模型中,经EMO干预后,大鼠肝组织中肝细胞坏死、排列紊乱情况得到改善,纤维明显减少,血清天冬氨酸氨基转移酶、丙氨酸氨基转移酶、总胆红素、IL-6、TNF-α、IL-17水平均降低,研究表明EMO缓解肝硬化进程的机制可能与通过Toll样受体4(toll-like receptor 4,TLR4)/NF-κB信号通路改善肝功能、减轻炎症反应有关。

2.3 肝衰竭

2.3.1 肝衰竭的治疗现状

肝衰竭是由多种病因引起的临床综合征,其特征是肝功能急性失代偿,常伴有相关的多器官衰竭和高短期病死率。根据“器官功能障碍假说”,肝硬化相关免疫功能障碍和引发的全身炎症是肝衰竭的核心发病机制。细菌易位、坏死性凋亡和焦亡、高氨血症等是肝硬化相关免疫功能障碍发展的重要因素35。目前,临床针对该疾病的治疗多为药物支持治疗,与肝硬化所面临的问题一致,肝移植被认为是唯一有效的治疗方法36

2.3.2 EMO对肝衰竭的治疗作用

Yin等37的研究指出,针对脂多糖(50 μg/kg)和D氨基半乳糖胺(800 mg/kg)共同诱导的急性肝损伤小鼠模型,进行EMO预处理(10、30、100 mg/kg)后发现,予以100 mg/kg EMO时小鼠病死率低至40%,EMO预处理以剂量依赖性方式提高了存活率,有效改善了小鼠因给药被破坏的肝结构及广泛出血、坏死和中性粒细胞浸润等病理改变。体外实验中,EMO被进一步证实可降低TLR4/髓系分化因子2复合体与RAW264.7小鼠TNF-α的表达,进而抑制NF-κB和MAPK等信号通路。既往研究指出,对L02细胞进行40 mmol/L D氨基半乳糖胺干预12 h基础上加入10 μmol/L EMO干预后,肝细胞凋亡率显著降低,SLC2A1、Caspase-3基因表达下调。结果表明,EMO通过调节B细胞淋巴瘤2蛋白和溶质载体家族2成员A1发挥抗凋亡作用,从而减轻D氨基半乳糖所致肝细胞损伤38

2.4 肝癌

2.4.1 肝癌的治疗现状

肝癌是全球癌症相关死亡最常见的原因之一,以慢性肝病和肝硬化为基础39,发病本质是“慢性损伤-炎症-纤维化-癌变-转移”的多病因连续过程,包括原癌基因的激活与抑癌基因的失活,共同导致细胞恶性增殖、凋亡抑制,进而发展为肿瘤40。肝癌的年病死率约1%41,其中肝细胞癌占90%以上42。由于发现迟、切除后高复发率、手术和移植的比例低等限制原因39,肝癌的治疗方法大多选择度伐利尤单抗联合替西木单抗或单用度伐利尤单抗43, 以及程序性细胞死亡蛋白1和程序性细胞死亡配体1与细胞结合的免疫检查点抑制剂为核心的免疫治疗44-45。然而,以上方案总体有效率仍有限。

2.4.2 EMO对肝癌的治疗作用

为明确EMO对肝细胞癌的作用,Hassan等46诱导肝细胞癌大鼠模型后,发现采用最低治疗浓度(40 mg/kg)的EMO可增加大鼠存活率,减少肝结节数量,降低蛋白激酶C、细胞外信号调节激酶5、血小板反应蛋白解整合素金属肽酶4、基质金属蛋白酶3和血管内皮生长因子的mRNA和蛋白质的表达,以及核因子红系2相关因子2、血红素加氧酶1的mRNA和聚集蛋白聚糖的表达,表明EMO可能通过抑制氧化应激、细胞增殖、侵袭和血管生成等发挥抗肝细胞癌的作用。Qin等47在体外实验中对HepG2细胞进行15、30、60 μmol/L的EMO预处理24 h,结果显示,EMO可抑制HepG2细胞增殖,诱导S期和G2/M期停滞,进而促进HepG2细胞凋亡;同时EMO诱导的自噬促进了蜗牛家族转录抑制因子和β-catenin降解,表明EMO通过影响磷脂酰肌醇3-激酶/蛋白激酶B/哺乳动物雷帕霉素靶蛋白和Wnt/β-catenin信号通路抑制EMT。

3 小结与展望

本文系统综述了EMO治疗慢性肝病的作用机制及研究现状,从抗炎、调控脂质代谢、抗肝纤维化和抑制肿瘤细胞增殖等方面,证明了EMO通过多种机制和途径靶向治疗慢性肝病。除保肝作用外,既往研究表明EMO对心血管系统疾病(心肌梗死48)、呼吸系统疾病(急性肺损伤49)、泌尿系统疾病(肾纤维化50)和神经系统疾病(慢性不可预知轻度应激型抑郁51)等同样具有保护作用;同时,其在抗溃疡、抗皮肤癌等方面的作用亦被证实52-53

EMO在慢性肝病治疗方面表现出巨大的潜力和应用前景,为充分发挥其治疗潜能,需重点关注以下两个方面:(1)需确定最佳剂量、给药途径和治疗方案,以最大程度地体现EMO的治疗效果;(2)可通过生物活性结合分子结构特性方式,制造生物活性及纯度更高的衍生物,达到同时调节多个靶点、扩大治疗范围的目的。

然而,EMO的治疗应用仍面临诸多挑战:(1)长期大剂量使用EMO可能引起肝毒性等不良反应;(2)作为存在于中药中的天然化合物,EMO结构复杂,难以有效提取,限制了其广泛应用;(3)治疗慢性肝病涉及复杂的生物学机制,需干预多个靶点,这种复杂性限制单一药物发挥疗效;(4)EMO可以同时干预细胞增殖、凋亡、转移和免疫逃逸等多环节以发挥抗肝癌作用,具有巨大治疗潜力,未来需通过更多临床研究验证其安全性和联合用药策略。

总之,为有效和安全地利用EMO及其衍生物治疗慢性肝病,需要采取涵盖各方面的整体策略,从而为中医药防治慢性肝病提供新思路与方向。

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基金资助

国家自然科学基金(82160845)

甘肃省自然科学基金(25JRRA254)

甘肃省自然科学基金(20JR5RA181)

甘肃省中医药高水平重点科研项目(GZKZ2024-36)

甘肃中医药大学引进人才科研启动基金(2024-YJRC-01)

甘肃省教育厅高等教育创新基金项目(2021B-173)

甘肃省兰州市城关区科技计划项目(2021-2-5)

甘肃中医药大学中医药科学研究与创新基金资助项目(KCZD2018-1)

甘肃中医药大学研究生创新创业基金项目(2025CXCY-008)

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