黄芪甲苷防治肝脏疾病的药理作用及其机制

付珂 ,  代书 ,  游娟 ,  杨晨 ,  李晓莉 ,  曾莉 ,  蒲诗云

临床肝胆病杂志 ›› 2025, Vol. 41 ›› Issue (10) : 2174 -2179.

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临床肝胆病杂志 ›› 2025, Vol. 41 ›› Issue (10) : 2174 -2179. DOI: 10.12449/JCH251032
综述

黄芪甲苷防治肝脏疾病的药理作用及其机制

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Pharmacological action of astragaloside Ⅳ in the prevention and treatment of liver diseases and its mechanism

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摘要

黄芪甲苷(AS-Ⅳ)是一种来源于黄芪的三萜皂苷类天然化合物,在调控肝脏疾病方面展现出重要潜力。本文系统梳理并总结了AS-Ⅳ在肝脏疾病研究领域的国内外最新进展,发现AS-Ⅳ可通过调节脂质代谢、抗肿瘤、抗炎、抗纤维化及调节肠道菌群等途径发挥对肝脏的保护作用。其作用机制涉及多条信号传导通路,包括AMPK、NLRP3、NF-κB、JAK2/STAT3和Nrf2等。这些研究成果为基于天然产物AS-Ⅳ开发保肝药物或相关功能性食品提供了科学依据。

Abstract

Astragaloside Ⅳ (AS-Ⅳ) is a natural triterpenoid saponin compound derived from Astragalus membranaceus and has shown significant potential in the regulation of liver diseases. This article reviews the latest research advances in AS-Ⅳ in the field of liver diseases in China and globally, and it is found that AS-Ⅳ exerts a liver-protecting effect by regulating lipid metabolism, exerting an anti-tumor/anti-inflammatory/anti-fibrotic effect, and modulating gut microbiota. Its mechanism of action involves multiple signaling pathways, such as AMPK, NLRP3, NF-κB, JAK2/STAT3, and Nrf2. These research findings provide a scientific basis for the development of liver-protecting drugs or functional foods based on the natural product AS-Ⅳ.

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关键词

肝疾病 / 黄芪甲苷 / 药理作用分子作用机制

Key words

Liver Diseases / Astragaloside Ⅳ / Molecular Mechanisms of Pharmacological Action

引用本文

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付珂,代书,游娟,杨晨,李晓莉,曾莉,蒲诗云. 黄芪甲苷防治肝脏疾病的药理作用及其机制[J]. 临床肝胆病杂志, 2025, 41(10): 2174-2179 DOI:10.12449/JCH251032

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肝脏疾病的主要类型包括代谢相关脂肪性肝病、酒精性肝病、慢性病毒性肝炎、肝硬化及肝癌等1。流行病学数据显示,全球每年因肝病死亡的人数约为200万,占全球总死亡人数的4%2。因此,探索新的药物与治疗手段对于解决这一重大公共卫生问题具有重要意义。
黄芪甲苷(astragaloside Ⅳ,AS-Ⅳ)属于三萜皂苷类天然化合物,是中药黄芪的主要活性成分。其分子式为C41H68O14,相对分子质量为784.97,密度为(1.4±0.1)g/cm3,熔点为295~296 ℃。常温下,AS-Ⅳ为白色结晶粉末,微溶于水,易溶于甲醇、乙醇和丙酮。现代药理学研究表明,AS-Ⅳ具有多种药理活性,包括抗炎3、抗氧化4以及对肝脏5、神经6和心脏7的保护作用。目前,国内外学者已针对AS-Ⅳ防治肝脏疾病的药理作用及机制开展了大量且广泛的实验研究,本文将重点综述相关研究成果,为基于AS-Ⅳ研发肝脏疾病治疗的新药或功能性食品提供科学参考。

1 多途径调节脂质代谢

1.1 激活AMP活化蛋白激酶(AMP-activated protein kinase,AMPK)信号通路

AMPK作为代谢紊乱相关疾病(包括脂肪性肝病、肥胖症、糖尿病及癌症等)的潜在治疗靶点8,已受到广泛关注。研究显示,在2型糖尿病合并代谢相关脂肪性肝病的小鼠模型中,AS-Ⅳ(30 mg/kg)可显著逆转p-AMPK/AMPK蛋白表达水平的下调,以及固醇调节元件结合蛋白1(sterol regulatory element-binding protein-1,SREBP-1)和脂肪酸合成酶(fatty acid synthase,FAS)蛋白表达水平的上调9,从而改善脂质代谢。在游离脂肪酸诱导的人肝癌HepG2细胞和原代小鼠肝细胞中,100 μg/mL剂量的AS-Ⅳ可显著抑制肝细胞中的脂质蓄积10;同时,50~200 μg/mL剂量的AS-Ⅳ以浓度依赖方式增强AMPK、乙酰辅酶A羧化酶(acetyl-CoA carboxylase,ACC)和SREBP-1c的磷酸化,抑制成熟SREBP-1的积累与核转位,从而降低ACC1、FAS和硬脂酰辅酶A去饱和酶1等脂肪生成基因mRNA的表达水平10

1.2 抑制内质网应激

当机体受到某些生理或病理因素影响导致稳态紊乱时,大量未折叠或错误折叠的蛋白质在内质网腔内聚积,引发内质网应激11-12。研究表明,内质网应激与代谢相关脂肪性肝病13、糖尿病14和高脂血症15等多种疾病的发生和病理进展密切相关。Zhou等10发现,在游离脂肪酸诱导的人肝癌HepG2细胞和原代小鼠肝细胞中,AS-Ⅳ可通过抑制关键标志物——葡萄糖调节蛋白78、CCAAT/增强子结合蛋白同源蛋白和磷酸化蛋白激酶R样内质网激酶等蛋白的表达,减轻游离脂肪酸诱导的肝脏内质网应激,从而有效改善脂质代谢紊乱。

1.3 诱导自噬

自噬是通过降解细胞器和蛋白质等细胞组分,维持细胞存活和功能的重要溶酶体途径16。已有研究明确自噬在肝脏脂质代谢中的关键作用,细胞自噬缺失会导致脂滴中甘油三酯(triglycerides, TG)储存增加,进而引发细胞功能障碍或死亡17-18。在高脂饮食联合低剂量链脲佐菌素诱导的2型糖尿病伴肝损伤大鼠模型中,AS-Ⅳ(80 mg/kg)改善了大鼠的肝功能、脂质代谢异常、氧化应激和炎症反应,该作用与促进AMPK/雷帕霉素靶蛋白(mechanistic target of rapamycin,mTOR)介导的自噬有关19。在棕榈酸诱导的脂肪肝细胞模型中,0.25、0.5和1 μg/mL剂量的AS-Ⅳ降低了蛋白激酶B(protein kinase B,AKT)和mTOR蛋白的磷酸化水平,同时增加了自噬体形成及自噬相关蛋白微管相关蛋白轻链3(light chain 3,LC3)和苄氯素1的表达20。此外,研究者通过LC3B与BODIPY493/503荧光双染色进一步发现,1 μg/mL剂量的AS-Ⅳ可通过增强细胞自噬,降低细胞内脂质沉积水平20

1.4 调节线粒体活性

临床证据显示,在慢性肝病患者中,线粒体功能受损会导致脂肪生成增加、脂肪酸β-氧化减少,进而造成肝细胞内TG积累,引发脂质代谢紊乱21。Luo等22发现,在代谢相关脂肪性肝病小鼠模型中,存在脂肪酸β-氧化、酮体生成异常及肝脏线粒体生物合成功能障碍;采用AS-Ⅳ(30和90 mg/kg)干预后,可逆转上述病理改变。此外,AS-Ⅳ还降低了模型小鼠血清和肝脏中的TG水平,促进脂肪酸在白色脂肪组织中的动员,上调了ACC、肉碱棕榈酰转移酶1A/1B及短链烯酰辅酶A水合酶等相关酶的表达22

2 抗肿瘤活性

2.1 抑制β-连环蛋白(β-catenin)

β-catenin是一种多功能且进化保守的分子,可介导细胞间黏附和基因转录调控,并参与多种恶性肿瘤的发生发展23。研究显示,在人肝癌HepG2细胞中,β-catenin的表达异常升高,而AS-Ⅳ(25、50和100 nmol/L)干预后,可逆转该蛋白的异常高表达,同时显著抑制HepG2细胞的侵袭和迁移,并促进细胞凋亡24。此外,10、50和100 nmol/L剂量的AS-Ⅳ以浓度依赖的方式,上调人肝癌Huh7和MHCC97-H细胞中上皮型钙黏蛋白的表达,下调神经型钙黏蛋白的表达,减少AKT和糖原合成酶激酶-3β(glycogen synthase kinase-3β, GSK-3β)的磷酸化水平,并抑制β-catenin的表达25。机制方面,AS-Ⅳ通过靶向AKT/GSK-3β/β-catenin信号通路,抑制上皮-间质转化,从而减弱肝癌细胞的迁移和侵袭能力,发挥抗肿瘤作用25

2.2 抑制血管生成

新生血管为肿瘤生长提供必不可少的氧气和营养,并为癌症扩散提供必要的运输通道,是癌症发展的关键环节26,因此抑制血管生成是癌症治疗的有效手段。在人原位肝癌裸鼠模型中,与未接种HepG2细胞的裸鼠相比,单独使用AS-Ⅳ(20 mg/kg)或与姜黄素联合使用,均能显著降低平均肿瘤质量及肿瘤微血管密度27;同时,两者联合应用还可通过降低成纤维细胞生长因子2、血管内皮生长因子、肝细胞生长因子和凝血因子Ⅶ等的表达,抑制肝癌进展,并在微血管密度、血管生成和血栓形成相关因子的表达方面表现出显著的协同作用27

2.3 抑制基质金属蛋白酶2(matrix metalloproteinase 2,MMP2)

MMP2属于ATP结合盒转运蛋白家族成员,可介导化疗药物从肿瘤细胞外排,降低化疗药物在肿瘤细胞内的浓度28-29。研究显示,顺铂能诱导小鼠肿瘤和人肝癌HepG2细胞中MMP2过表达,进而降低顺铂的化疗敏感性,增强肿瘤细胞的耐药性;而AS-Ⅳ干预不仅可逆转上述病理改变,还能与顺铂产生协同增效作用。在荷瘤小鼠模型中,50 mg/kg剂量的AS-Ⅳ显著抑制了肿瘤体积与质量,促进肿瘤细胞凋亡,并抑制了肿瘤组织中MMP2的表达30。此外,在人肝癌HepG2细胞中,AS-Ⅳ可显著降低细胞活力,增加细胞凋亡并降低MMP2的表达30

2.4 调节microRNA(miRNA)信号通路

miRNA是真核生物细胞中一类高度保守的短链非编码RNA,通常由18~24个核苷酸组成,已有研究证实其与肝癌31、结直肠癌32及乳腺癌33等多种癌症的发生和发展密切相关。近期研究显示,AS-Ⅳ(10、20、40和80 μg/mL)能够以浓度依赖的方式抑制人肝癌Huh-7和SMMC-7721细胞的增殖34。在接种人肝癌Huh-7细胞的雄性BALB/c裸鼠中,50、100和150 mg/kg剂量的AS-Ⅳ可延缓肿瘤生长并减小肿瘤体积。机制上,AS-Ⅳ通过miR-135b-5p/肌肽酶1轴降低细胞表面程序性死亡配体1的表达,从而增强抗肿瘤免疫应答34。在人肝癌原位移植瘤裸鼠模型中,20 mg/kg剂量的AS-Ⅳ可降低平均肿瘤质量,其抗肿瘤作用可能部分源于对miR-122和miR-221表达的调节27

3 抗炎活性

3.1 抑制核因子-κB(nuclear factor kappa-B, NF-κB)信号通路

NF-κB是一类关键的转录因子,其激活可促进炎症介质的释放,参与急性和慢性炎症反应35。在肝移植缺血再灌注损伤大鼠模型中,100 g/mL剂量的AS-Ⅳ预处理可下调TNF-α水平,抑制NF-κB的转录活性,显著提高大鼠存活率,改善肝功能,减轻肝脏炎性损伤36。在高脂饮食诱导的非酒精性脂肪性肝病大鼠模型中,AS-Ⅳ同样可显著抑制高脂饮食引起的肝脏炎症:20、40和80 mg/kg剂量的AS-Ⅳ可降低模型大鼠血清AST、ALT、TG、TNF-α、IL-6和IL-8水平,并下调肝组织中Toll样受体4和NF-κB的基因与蛋白表达37。上述研究提示,AS-Ⅳ通过靶向NF-κB通路抑制炎症级联反应,在多种肝脏疾病动物模型中均展现出显著的抗炎活性。

3.2 抑制核苷酸结合寡聚化结构域样受体蛋白3(nucleotide-binding oligomerization domain-like receptor protein 3,NLRP3)炎症小体

NLRP3炎症小体是一种多蛋白复合物,可通过识别病原体相关分子模式和损伤相关分子模式,激活含半胱氨酸的天冬氨酸蛋白酶-1(cysteinyl aspartate specific proteinase-1, Caspase-1),促进IL-1β和IL-18的成熟与分泌,在炎症反应中发挥核心调控作用38。Wu等39研究发现,在急性酒精刺激小鼠模型中,50、150和500 mg/kg剂量的AS-Ⅳ可改善肝组织的病理改变,并抑制肝脏NLRP3、Caspase-1、IL-1β和IL-18蛋白的表达,表现出显著的肝脏保护作用。在辐射诱导的肝脏炎症小鼠模型中,NLRP3、Caspase-1和IL-1β的表达及炎症因子水平显著升高,而AS-Ⅳ(20和40 mg/kg)可显著逆转上述变化40。此外,Qu等41研究表明,腹腔注射顺铂可诱发急性肝、肾损伤,并激活NLRP3炎症小体;而使用40和80 mg/kg剂量的AS-Ⅳ进行干预,能够通过抑制NLRP3的表达,有效逆转顺铂诱导的上述损伤。

3.3 抑制Janus激酶2/信号转导和转录激活因子3(Janus kinase 2/signal transducer and activator of transcription 3,JAK2/STAT3)信号通路

JAK2/STAT3通过调控促炎因子的表达和免疫细胞功能参与炎症反应,其异常激活与多种炎症性疾病密切相关42。因此,抑制JAK2/STAT3信号通路可改善炎症反应。例如,在重症急性胰腺炎肝损伤大鼠模型中,20 mg/kg剂量的AS-Ⅳ可改善肝脏病理损伤,降低血清AST、ALT、IL-6、TNF-α及IL-1β水平,同时下调肝脏中p-JAK2和p-STAT3的蛋白表达,有效缓解肝损伤。机制上,AS-Ⅳ通过抑制JAK2/STAT3信号通路的活化,从而发挥其肝脏保护作用43

4 抗纤维化活性

Li等44研究发现,AS-Ⅳ可在体外通过氧化应激介导的p38丝裂原活化蛋白激酶(mitogen-activated protein kinase,MAPK)途径,抑制肝星状细胞(hepatic stellate cell,HSC)的增殖、活化和胶原合成,从而有效改善肝纤维化。在胆管结扎诱导的肝纤维化大鼠模型中,AS-Ⅳ(10.8 mg/kg)治疗可减轻模型大鼠的肝纤维化。机制上,AS-Ⅳ可诱导核因子E2相关因子2(nuclear factor erythroid 2-related factor 2,Nrf2)在细胞核内积累,通过负调控GSK-3β,促进抗氧化酶的合成,清除活性氧,进而抑制HSC的活化45。已有文献表明,HSC在慢性肝损伤过程中被激活转化为肌成纤维细胞,是肝纤维化的重要枢纽46。AS-Ⅳ可通过多种途径阻断HSC的活化,在肝纤维化治疗中展现出较大潜力。

5 抗病毒活性

Wang等47研究表明,在转染HBV的人肝癌细胞株HepG22.2.15中,40、100和200 μg/mL剂量的AS-Ⅳ能有效抑制HBV抗原的分泌,其中100 μg/mL浓度作用9天时,对HBsAg和HBeAg的分泌抑制率分别为23.6%和22.9%。在鸭HBV感染的雏鸭模型中,10、40和120 mg/kg剂量的AS-Ⅳ处理10天后,对血清中鸭HBV的抑制率分别为41.7%、49.6%和64.0%,且能显著降低血清中鸭HBV DNA水平47。综上所述,AS-Ⅳ在细胞和动物模型中均表现出良好的抗HBV活性,可显著抑制病毒复制及抗原分泌,对病毒性肝炎具有潜在治疗价值。

6 调节肠道菌群

Wu等39研究发现,AS-Ⅳ可改善酒精诱导的肝脏病理变化、功能障碍、炎症和氧化损伤,降低血清脂多糖和髓过氧化物酶水平。此外,AS-Ⅳ可恢复肠道菌群的稳态,调节ButyricicoccusTuricibacterAkkermansiaAnaerotruncusMucispirillum等失调菌群的丰度,使其更接近未用酒精造模的正常小鼠水平39。更重要的是,这些肠道菌群与潜在生物标志物之间存在较强的相关性。在高脂饮食诱导的代谢相关脂肪性肝病小鼠模型中,12.5、25和50 mg/kg剂量的AS-Ⅳ减轻了高脂饮食引起的肝脏病理损伤和代谢异常,尤其是肝脂肪变性48。机制上,AS-Ⅳ通过调节肠道菌群的组成和结构,抑制胆汁酸的解偶联,进而通过肠道法尼醇X受体(farnesoid X receptor, FXR)信号通路减轻肝脏损伤及脂肪变性48。需注意,AS-Ⅳ口服生物利用度较低,但其药理活性较强,肠道菌群可能是连接两者的关键靶点,值得在后续研究中深入探讨。

7 其他药理作用

除了上述已经阐述的药理活性,AS-Ⅳ的抗氧化作用也在体内实验中被进行评估49-50。以对乙酰氨基酚诱导的小鼠肝脏毒性模型为实验对象,结果证实,20和40 mg/kg剂量的AS-Ⅳ可改善肝脏病理状态,增强谷胱甘肽和超氧化物歧化酶的活性,并降低丙二醛的含量。机制上,AS-Ⅳ通过增强Nrf2的转录激活作用,诱导血红素加氧酶1的表达,进而促进下游抗氧化基因的转录表达。此外,在顺铂诱导的肝损伤小鼠模型中,40和80 mg/kg剂量的AS-Ⅳ可通过抑制过氧化物酶体增殖物激活受体α/铁死亡抑制蛋白1信号通路,阻止铁离子积聚,从而有效缓解肝损伤、炎症反应和氧化应激5

8 小结与展望

AS-Ⅳ可通过调节脂质代谢、抗肿瘤、抗炎、抗氧化、抗纤维化、抗病毒及调节肠道菌群等多种途径发挥肝脏保护作用(图1),在代谢相关脂肪性肝病、肝癌、肝纤维化及病毒性肝炎等复杂肝病的防治中具有广阔的应用前景。然而,利用AS-Ⅳ治疗肝脏疾病仍存在以下不足。(1)AS-Ⅳ因高分子量及低水溶性的理化特性,生物利用度显著受限,口服给药后绝对生物利用度仅为2.2%。为此,可开发以纳米粒、外泌体、脂质体等为载体的新型AS-Ⅳ制剂,以提升其生物利用度,增强药理活性并提高肝脏靶向性。(2)现有研究虽证实AS-Ⅳ可通过多种途径发挥保肝作用,但各途径间的级联效应尚未明确。因此,可构建代谢组学、转录组学与蛋白质组学的三元整合分析策略,并结合单细胞测序和空间组学技术构建多维度分子互作网络,从更深层次探究AS-Ⅳ的肝保护机制。(3)AS-Ⅳ的野生植物资源有限,且植物生长周期长、受环境影响较大。同时,直接从植物中提取AS-Ⅳ的过程繁琐且效率低下。故可采用合成生物学等更高效的方法,解决AS-Ⅳ资源供应不足的问题。总体而言,AS-Ⅳ作为一种高效、低毒且价廉的天然产物,具有广阔的临床应用前景,值得进一步深入研究与开发。

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基金资助

国家自然科学基金(82003828)

委校联合创新基金项目(WXLH202402028)

四川省中医药管理局基金项目(2022CP7147)

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