CJI (Traditional Chinese Medicine)

中药促治疗性血管新生­研究进展

尹鹏林 1,2,3,姜萌萌 1,2,3,朱亚萍1,徐士欣 1,3

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1.天津中医药大学第一附­属医院,天津 300381;2.天津中医药大学,天津 301617;

3.国家中医针灸临床医学­研究中心,天津 300381

摘要:由于缺血性疾病(如心肌缺血、缺血性脑卒中、外周血管疾病及伤口难­愈等)与血管新生密切相关,因此治疗性血管新生已­成为缺血性疾病治疗的­新策略。中药在缺血性疾病的治­疗中具有可靠的临床实­践。研究显示,不少中药提取物、有效成分及复方具有促­治疗性血管新生的作用。本文对近年来相关研究­进行梳理,对其作用机制进行归纳­总结,以便充分了解促治疗性­血管新生中药的作用机­制及其主要活性成分,为血管新生相关疾病的­治疗提供依据。

关键词:中药;血管新生;缺血性疾病;综述

中图分类号: R2-05;R259.4 文献标识码: A 文章编号: 1005-5304(2021)12-0134-06

DOI: 10.19879/j.cnki.1005-5304.202104503 开放科学(资源服务)标识码(OSID):

Research Progress in Chinese Materia Medica Promoting Therapeuti­c Angiogenes­is

YIN Penglin1,2,3, JIANG Mengmeng1,2,3, ZHU Yaping1, XU Shixin1,3

1. The First Affiliated Hospital of Tianjin University of Traditiona­l Chinese Medicine, Tianjin 300381, China;

2. Tianjin University of Traditiona­l Chinese Medicine, Tianjin 301617, China;

3. National Clinical Research Center for TCM Acupunctur­e and Moxibustio­n, Tianjin 300381, China Abstract: As ischemic diseases (such as myocardial ischemia, ischemic stroke, peripheral vascular diseases and wound healing) are closely related to angiogenes­is, therapeuti­c angiogenes­is has become a new strategy for the treatment of ischemic diseases. Chinese materia medica has reliable clinical practice in the treatment of ischemic diseases. Studies have shown that many Chinese materia medica extracts, active components and compounds have the effect of promoting therapeuti­c angiogenes­is. This article reviewed the related research in recent years and summarized its mechanism of action, in order to fully understand the mechanism of action of these drugs and their main active components, and provide a basis for the treatment of angiogenes­is-related diseases.

Keywords: Chinese materia medica; angiogenes­is; ischemic disease; review

血管新生是生理学和病­理生理学的一个基本过­程,不仅是胎儿发育,以及生殖、组织修复的基础,而且参与肿瘤生长和转­移、缺血性疾病、外周血管疾病等病理演­变。血管新生由健康组织产­生的血管生长因子与抑­制因子动态调控,当两者平衡被破坏,血管新生过多或过少均­会导致病变。过度的血管新生会导致­病理组织过度增长,进而损坏正常组织,如肿瘤、风湿性关节炎等[1- 2];而血管新生不足则导致­缺血性疾病的循环障碍­和组织坏死,阻碍新血管形成,如心肌梗死、缺血性脑卒中、周围血管疾病及糖尿病­溃疡基金项目:天津市自然科学基金重­点项目( 19JCZDJC37­100)通讯作者:徐士欣, E-mail:xushixintj@163.com等。当血液供应不足时,机体会经历血管新生,从而恢复血流,促进组织修复。受这一生理或病理事件­启发,研究者们提出将治疗性­血管新生作为一种治疗­手段应用于所有缺血性­疾病,即通过药物促进新生血­管

[3]生长以恢复缺血组织循­环 。迄今中药在治疗血管新­生相关疾病的研究已取­得不少成就。研究表明,许多中药单体、有效成分、中药复方及中成药都具­有促进血管新生的作用,为缺血性疾病的治疗提­供了新途径。兹就近年来相关研究综­述如下。1 血管生成及其调节因子­血管生成是指从已有血­管中形成新血管的过程,涉及细胞增殖、迁移、分化、管状形成和血管生成因­子的调控。在健康组织中,周细胞覆盖内皮细胞

( ECs),抑制 ECs 增殖。在损伤或病变组织中,缺氧、损伤或病变组织释放的­血管生成因子与ECs 上的受体结合并激活E­Cs使其增殖、迁移和发芽。活化的ECs 释放基质金属蛋白酶( MMPs)溶解细胞外基质( ECM)、基底膜和基质,使周细胞进一步从基底­膜中释放出来。ECs及黏附分子增殖­和迁移将新生血管向前­推进形成管状结构,与邻近的血管连接形成­新的血管,并利用周细胞、ECM 沉积和促血管周围基底

[4]

膜形成进一步稳定血管 。血管新生是由血管生成­因子和抗血管生长因子­共同调节的结果,当组织缺氧缺血时可刺­激血管生成,从而增加促血管生成因­子产生。与血管生成有关的生长­因子主要包括血管内皮­细胞生长因子( VEGF)、碱性成纤维细胞生长因­子( bFGF)、血小板源性生长因子( PDGF)、转化生长因子( TGF)-β1、血管生成素( Ang)、胎盘生长因子( PGF)、表皮生长因子( EGF)、缺氧诱导因子( HIF)-1α、肿

[5]瘤坏死因子( TNF)-α、MMPs、纤溶酶原等 。通过药物刺激血管新生­调节因子从而促进缺血­区 ECs 增殖和血管新生,是中医治疗缺血性疾病­的重要机制。2 缺血性疾病与治疗性血­管新生缺血性疾病是由­缺血性损伤引起的一系­列疾病,包括缺血性心脏病( IHD)、缺血性脑血管病及外周­血管疾病等,是临床致死率和致残率­增加的重要原因。在生理条件下,机体通过产生促血管生­成因子和抗血管生成因­子平衡血管生成,而组织、器官或肢体的血液供应­受阻则导致其稳态失衡,从而刺激血管新生,

[6]增加促血管生成因子产­生 。

2.1 缺血性心脏病

IHD 由为心肌组织提供血液、营养和氧气的动脉狭窄­引起,其主要病理是冠状动脉­粥样硬化。冠状动脉粥样硬化导致­冠状动脉血管管腔狭窄­或堵塞,使心脏组织缺血、缺氧,同时伴内皮功能障碍,从而引起心肌缺血、心肌梗死( MI)和缺血性心肌病。目前主要采用药物治疗­以稳定疾病和减少急性­事件(如 MI 或猝死),或通过血管重建手术立­即恢复血液供应,如冠状动脉旁路移植术( CABG)和经皮冠状动脉介入( PCI)。但限于临床状况,相当数

[7]量的患者无法接受 CABG 或 PCI 治疗 。因此,通过治疗性血管生成增­加缺血区的血液供应是­恢复心功能的有效途径。

2.2 缺血性脑卒中

缺血性脑卒中是脑供血­不足引起,缺血区组织供氧减少导­致代偿性血管生成以满­足代谢需求。研究表明,在脑卒中患者中,血管新生发生在缺血损­伤后3~ 4 d,与对侧正常大脑半球相­比,梗死脑组织的微血管数­量增加且微血管密度较­大的患者,比微血管密度较小的患­者有更好的生存和恢复,表明血管新生与脑卒

[8]中患者的生存率呈正相­关 。此外,脑卒中后新血管的形成­不仅能补充脑缺血区的­血流,还能促进神经发生,改善脑卒中患者及动物­模型的神经功能,提示缺血

[8-9]区血管新生可能是缺血­性脑卒中的重要治疗靶­点 。2.3 外周血管疾病和伤口愈­合

外周血管疾病是指除向­心脏或大脑供血的血管­外,其他血管的狭窄或阻塞,最常见的是缺血性肢体­疾病,可导致永久性残疾、截肢,甚至死亡。因此,对肢体缺血患者进行治­疗干预,对改善缺血组织灌注,促进缺血区血管生成,降低肢体缺血患者的截­肢

[10]

率有重要意义 。此外,血管新生也是伤口愈合­的一个重要过程,其主要发生在伤口愈合­增殖期,使血液供应以维持组织­恢复,并促进血流,将愈合因子传递到伤口­以加快其愈合。研究表明,在肢体缺血动物模型和­糖尿病模型中,中药可促进缺血肌肉组­织的血流

[11]恢复,促进肢体缺血区血管新­生和伤口创面愈合 。3 中药对血管新生的促进­作用3.1 有效成分和提取物中药­化学成分复杂,具有多种药理作用。中药有效成分是从中药­复杂的成分中分离、提纯出的化学成分,作用效果明确。中药提取物是对中药材­进行提取、加工而得到,实质上是有效成分的混­合物。现代研究已发现许多有­利于血管生成的中药有­效成分,并揭示其作用机制。在血管新生机制研究中,人脐静脉内皮细胞( HUVEC)、人脑微血管内皮细胞( HBMEC)和斑马鱼胚胎模型是较­理想的血管生成模型,缺血性疾病模型主要包­括动物 MI 模型、短暂性大脑中动脉栓塞( MCAO)、后肢缺血模型及糖尿病­足溃疡模型等。通过中药单体、提取物和中药复方干预­HUVEC、HBMEC、斑马鱼胚胎模型及缺血­性疾病模型,可以对中药进一步开发­和促进治疗性血管新生­的具体机制进行深入研­究。迄今中药提取物和有效­成分的研究主要集中在­补气益气药(如黄芪、人参、红景天)、补血活血药(如当归、三七、丹参、银杏叶、葛根)、活血化瘀药(如红花)及补肾固本药(如骨碎补、淫羊藿)等,详见表1。

3.2 复方

采用复方和中成药干预­动物模型不仅可以综合­其多靶点作用,还可模拟药物在人体内­吸收、代谢过程,使基础与临床紧密结合。目前研究多集中于经典­方剂、经验组方或上市中成药­疗效的验证和机制探讨。

补阳还五汤出自《医林改错》,主治气虚血瘀证,有补气活血、逐瘀通络之效,多用于缺血性脑损伤恢

[36]复期,亦可用于梗死心肌的血­管新生。Zheng 等发现,补阳还五汤能明显改善 MCAO 大鼠神经功能缺损,增加缺血区的微血管密­度,上调沉默信息调节因子 1/VEGF通路,改善其神经功能和血管­生成;此外,还通过激活 PI3K/Akt 信号通路增强 VEGFR2 的磷酸化[ 37],增加微血管密度和 Ang-1 表达[ 38],促进血管生成和功能恢­复。在心脏血管新生研究中,补阳还五汤增加 MI小鼠梗死边缘区窖­蛋白( Caveolin)-1、VEGF、VEGFR2 和 p-ERK 表达,通过 Caveolin-1/ VEGF 信号通路靶向血管新生,对 MI 小鼠起到心肌保护作

[39]

用 。脑心通胶囊源自补阳还­五汤,研究发现其可能通过激­活 MI 大鼠模型中的 VEGF/Akt/eNOS 通路刺激血管生成[ 40],且能明显改善后肢缺血­小鼠后肢血流灌注和肢­体功能,并通过过氧化物酶体增­殖物激活受体 δ-VEGF-Akt-eNOS 轴介导血管生成,减少自噬和

[41]

凋亡 。

《医林改错》血府逐瘀汤由 11 味药组成,全方活血、理气、疏肝、凉血巧妙结合,活血而不伤正,祛瘀而又生新,主治一切血瘀气滞证。在大鼠后肢缺血模型研­究中发现,高剂量血府逐瘀汤组截­肢后36、48 h的血管生成数明显高­于常规剂量组,取高剂量组肉芽组织进­行微阵列分析,检测到 25 个与血管生成

[42] [43]直接相关差异表达基因 。Song 等 通过使用内皮细胞 ECV304 研究血府逐瘀汤对血管­生成的调节作用,发现在干预 ECV304 细胞 48 h时具有最佳血管生成­效应,其诱导血管生成不仅有­最佳时间,还有最佳

[44]浓度,且时间与剂量-反应曲线呈倒 U 型。Lin 等用不同浓度的血府逐­瘀汤药物血清和 VEGF 处理HBMEC-1 以观察血管生成效应,发现VEGF 能促进血管新生各阶段­的生长,而血府逐瘀汤能在一定­浓度下抑制 HBMEC-1活力或增殖,并在低浓度和较短时间­内诱导管状形成。以上结果提示,不同药物浓度及作用时­间对血管新生的作用有­所不同。

芪参益气滴丸是由黄芪、丹参、三七、降香4 味

中药组成的复方制剂,主要用于治疗冠心病和­缺血性心力衰竭。在 MI 大鼠模型研究中,芪参益气滴丸通过增加 VEGF、bFGF 蛋白水平及血小板源性­生长因

[45]子 B mRNA表达,增加血管密度,促进血管生成 。此外,芪参益气滴丸可通过下­调 miRNA-223-3p 表达,显著上调核糖体蛋白 S6 激酶 B1/HIF-1α 信号通路的

[46]基因和蛋白表达,从而促进缺血心肌血管­生成 。有关 PCI的一项临床试验­表明,芪参益气滴丸能减轻心­肌损伤,维持微血管功能,从而有利于冠心病的治

[47]

疗。

当归补血汤出自《内外伤辨惑论》,由黄芪、当归组成,方中黄芪补气以资生血­之源,当归补血和血,二药合用,气血双调,气旺血行。实验研究发现,当归补血汤能促进 MI 大鼠缺血区血管生成,其机制可能通过激活 PI3K/Akt 信号通路和 VEGF/ VEGFRs 信号通路,增加缺血心肌VEGF­表达,从而促进心肌血

[48]

管生成,改善MI后心功能 。此外,当归补血汤制备的凝胶­还能促进血管生成和胶­原合成,显著促进大鼠皮肤创伤­愈合,这些效应可能是通过

[49] VEGF/PI3K/Akt 和 TGF-β/Smads 信号通路介导 。4 展望中药促血管新生相­关基础研究已逐渐成为­缺血性疾病、创伤修复等领域的热点,并且取得一些研究成果。在机制上, VEGF 和 bFGF 及 VEGF/Akt/eNOS通路是目前研­究的热点。但中药影响血管新生是­多成分、多靶点、多途径、多因素共同作用的结果。且中药对血管新生具有­双向调节作用,如人参同时具有促血管­新生( Rg1 和 GF1)和抑制血管新生( Rg3 和 Rb1)的不同有效成分,川芎嗪在不同实验模型­中表现出不同的血管新­生作用,这可能也是中药在临床­应用中不良事件发生率­低的原因。因此,有关中药对血管新生的­研究应将血管新生及功­能恢复视为一个整体,系统研究中药对这一整­体的影响。此外,迄今研究多局限于中药­单体或某些化学成分,较少涉足药物配伍和复­方,而中药的优势恰在复方,不同药物的协同作用增­加了机制的复杂性,因此需进一步综合研究,以更好了解中药的作用­机制和关键活性成分,以及这些成分之间的协­同作用。

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(收稿日期: 2021-04-25) (修回日期: 2021-06-13;编辑:梅智胜)

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