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   复旦学报(医学版)  2023, Vol. 50 Issue (1): 147-153      DOI: 10.3969/j.issn.1672-8467.2023.01.021
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Th17/Treg在慢性阻塞性肺疾病中的研究进展
刘韩韩1 , 朱蕾1,2     
1. 复旦大学附属中山医院呼吸与危重症医学科 上海 200032;
2. 清华大学附属北京清华长庚医院重症医学科 北京 102218
摘要:辅助性T淋巴细胞17(T-helper 17,Th17)及调节性T淋巴细胞(regulatory T lymphocyte,Treg)在慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)中的作用不同,两者之间的平衡在COPD发生、发展中的作用更为重要。调控Th17/Treg平衡的分子机制众多且复杂,涉及miR-21 Smad7转化生长因子β(transforming growth factor-β,TGF-β)、c-Jun/同种异体移植物炎症因子1(allograft inflammatory factor 1,AIF1)、Wnt/β-catenin、细胞因子信号转导抑制因子(suppressor of cytokine signaling,SOCS)、信号转导和转录激活因子(signal transducer and activator of transcription,STAT)及腺苷A2a受体(adenosine A2a receptor,A2aR)等信号通路。针对Th17及Treg的分子靶向治疗现处于动物实验阶段。N-乙酰半胱氨酸、红霉素等已被证实通过调节Th17/Treg平衡可减轻COPD患者的全身炎症,改善肺功能,减缓疾病进展。本文对Th17/Treg在COPD中的作用及治疗进展进行综述,以期为COPD患者的免疫治疗提供相关研究信息。
关键词Th17    Treg    Th17/Treg平衡    慢性阻塞性肺疾病(COPD)    分子机制    靶向治疗    
Research progress of Th17/Treg in chronic obstructive pulmonary disease
LIU Han-han1 , ZHU Lei1,2     
1. Department of Pulmonary and Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China;
2. Department of Critical Care Medicine, Beijing Tsinghua Changgung Hospital, Tsinghua University, Beijing 102218, China
Abstract: T-helper 17 (Th17) and regulatory T lymphocyte (Treg) play different roles in chronic obstructive pulmonary disease (COPD), however, the balance of Th17/Treg plays a more important role in the pathogenesis and development of COPD. The molecular mechanisms involved in Th17/Treg homeostasis are numerous and complex, including miR-21/Smad7/transforming growth factor-β (TGF-β), C-Jun/allograft inflammatory factor 1(AIF1), Wnt/β-catenin, cytokine signal suppressor (SOCS), signal transduction and transcription activator (STAT), and adenosine A2a receptor (A2AR) signaling pathways. The targeted therapy for Th17/Treg is currently in the stage of animal trials. N-acetylcysteine and erythromycin had been proved to reduce systemic inflammatory response, improve lung function and delay disease progression in COPD patients by regulating Th17/Treg balance.This review summarizes the role and treatment progress of Th17/Treg in COPD, aiming to provide assistance for immunotherapy in COPD patients.
Key words: Th17    Treg    Th17/Treg balance    chronic obstructive pulmonary disease (COPD)    molecular mechanism    targeted therapy    

慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)是以持续气流受限为特征的慢性炎症疾病,吸烟、空气污染是主要的诱发因素[1]。香烟烟雾等使树突状细胞(dendritic cell,DC)在气道上皮下大量聚集,活化的T细胞和B细胞在肺内克隆增生,引起免疫炎症反应[2],其中CD4+T细胞在COPD发病中的作用逐渐受到重视。外周血中未经抗原刺激的naïve CD4+T细胞在识别抗原后活化、增殖并分化为不同的功能亚群,如辅助性T淋巴细胞(helper T lymphocyte,Th)和调节性T淋巴细胞(regulatory T lymphocyte,Treg),到达肺部介导多种炎症介质的释放,导致气道炎症和肺气肿。辅助性T淋巴细胞17(T-helper 17,Th17)作为Th细胞的一个亚群,主要分泌促炎细胞因子,介导嗜中性粒细胞气道炎症;Treg则具有免疫抑制功能,Th17/Treg的平衡影响气道-肺炎症和COPD的发展。

Th17/Treg概述  Th17细胞产生IL-17A、IL-17F和IL-22,这些细胞因子通过诱导上皮细胞产生抗菌肽,促进黏膜防御细胞外细菌和真菌感染;同时通过诱导趋化因子招募中性粒细胞,加重炎症反应[3]。Th17细胞的分化和致病作用受众多胞内外信号的调控。蛋白质信号转导和转录激活因子3(signal transduction and transcription activator 3,STAT3)在T细胞抗原受体/共刺激信号以及转化生长因子β(transforming growth factor-β,TGF-β)和IL-6的刺激下被激活,上调维甲酸相关孤核受体γ(retinoid-related orphan receptors-γt,RORγt)和α(RORα)的表达,促使CD4+T细胞向Th17亚群分化。IL-2是Th17分化的关键阻遏物,IL-2通过激活STAT5抑制Th17产生IL-17A。

Treg最初被定义为高表达CD25(IL-2受体的α亚基)的CD4+T细胞,需要持续的IL-2信号刺激维持体内平衡和功能。叉头盒蛋白P3(forkhead box protein P3,FOXP3)是Treg细胞特异性的转录调控因子,对CD4+ CD25+ Tregs的发育和功能发挥有重要促进作用。Miyara等[4]将人Treg细胞分为3个功能和表型独立的亚群:CD45RA+ FOXP3low静息细胞(rTreg)、CD45RA- FOXP3high活化细胞(aTreg)、CD45RA- FOXP3low细胞。aTreg亚群细胞高表达FOXP3和CD25,具有高免疫抑制能力。

已知活化的Treg细胞主要通过释放颗粒酶A和穿孔素杀死效应细胞或抗原提呈细胞,或通过细胞毒性T淋巴细胞相关抗原4(cytotoxic T lymphocyte-associated antigen-4,CTLA-4)、CD80和/或CD86对效应细胞和抗原提呈细胞进行功能调节,也可通过分泌抗炎因子IL-10和TGF-β抑制DC和T细胞的功能。Akkaya等[5]发现抗原特异性Tregs细胞还可消耗DC表面的肽-主要组织相容性复合物Ⅱ类(peptide-MHC class Ⅱ molecules,pMHCⅡ)而下调DC的抗原呈递功能,抑制免疫反应。

Th17与COPD   影响Th17细胞分化的上游机制和Th17主要通过分泌IL-17A影响下游靶基因的表达,参与COPD的发病过程;Th17还使机体发挥防御胞外细菌和真菌感染的作用,减少COPD的急性加重。

影响Th17分化的上游分子机制  Pu等[6]发现在COPD实验模型中,烟雾暴露可通过Toll样受体2(Toll-like receptor 2,TLR2)显著增强DC的成熟和活化,导致大鼠出现Th17反应和肺气肿。He等[7]在烟雾诱导的COPD模型小鼠中,发现miR-21/Smad7/TGF-β通路可诱导Th17分化,参与COPD的发病。

IL-17A诱导COPD发病的机制  IL-17A可通过激活IκB激酶抑制剂α(IκB kinase-α,IKK-α)诱导胸腺基质淋巴细胞生成素(thymic stromal lymphopoietin,TSLP)表达,促进COPD的气道炎症[8];以自分泌方式作用于局部气道,放大炎症并增加COPD的黏液产生[9];增加P53及其下游糖蛋白纤溶酶原激活物抑制剂1(plasminogen activator inhibitor-1,PAI-1)的表达,导致COPD患者CXC型趋化因子配体1和2(CXC chemokine ligand,CXCL1 and CXCL2)和趋化因子受体2(CXC chemokine receptor 2,CXCR2)升高,促进肺泡上皮细胞凋亡和肺损伤[10-11];增强TGF-β1的水平,抑制炎症相关介质或炎症细胞自噬,促进气道重塑[11];诱导中性粒细胞趋化因子,如IL-8、粒细胞集落刺激因子(granulocyte-colony-stimulating factor,G-CSF)和CXCL2的表达,募集中性粒细胞至炎症病灶,分泌更多的中性粒细胞弹性蛋白酶和髓过氧化物酶,破坏肺泡壁,引起肺气肿。

IL-17A使机体发挥防御胞外细菌和真菌感染的作用,可能有助于防止COPD急性发作或发生肺炎等并发症。Geng等[12]发现,与单纯COPD患者相比,COPD合并侵袭性肺曲霉菌病(invasive pulmonary aspergillosis,IPA)患者外周血中RORγt、IL-17A水平更高;然而在COPD合并IPA的小鼠中敲除IL-17A基因,曲霉菌负荷几乎是COPD合并IPA的2倍,IL-17A的缺失加重了COPD合并IPA的进展。

IL-17A水平可预测COPD病情严重程度及类固醇抵抗  Zou等[13]发现COPD急性加重期(acute exacerbation COPD,AECOPD)患者血清IL-17A明显高于稳定期COPD患者和健康人,血清IL-17A水平与超敏C反应蛋白和中性粒细胞百分比正相关,与1秒用力呼吸容量预计值(FEV1%pred)负相关。Kubysheva等[14]的研究共纳入58名COPD患者,并对其进行为期2年的随访,其研究结果显示,在COPD患者中血清IL-17A水平随疾病严重程度增加而升高,肺功能GOLD Ⅳ级的COPD患者其血清IL-17A水平最高,血清IL-17A水平与FEV1%pred和用力肺活量(forced vital capacity,FVC)负相关。Li等[15]共招募87名稳定期COPD患者、24名AECOPD患者及29名健康对照,同样得出IL-17A与肺功能负相关,与患者临床症状和恶化正相关。因此,IL-17A升高可作为COPD患者持续嗜中性气道炎症和病情严重程度的标志。

Christenson等[16]进一步分析了GLUCOLD数据集中49名进行了支气管镜活检患者的临床资料,结果显示与安慰剂组相比,吸入性糖皮质激素(inhaled corticosteroid,ICS)治疗组中部分患者的1秒用力呼吸容量(forced expiratory volume in one second,FEV1)改善,部分恶化,其中前者与气道上皮中IL-17A低水平相关,后者与气道上皮中IL-17A高水平相关,证明气道上皮IL-17A升高与COPD患者的类固醇抵抗相关,且IL-17A与ICS之间的相互作用不受气道嗜酸性粒细胞的影响。

Treg与COPD  Treg及其亚群的细胞数量减少或功能缺陷与COPD患者肺功能减退、病情进展有关。Treg细胞除免疫抑制作用外,在COPD中还发挥促炎和促纤维化作用。

Treg及其亚群的数量和功能与病情严重程度负相关  Ström等[17]发现肺功能快速下降的COPD患者肺泡灌洗液中Treg细胞数量较低。Chiappori等[18]证明外周血Treg细胞数量的降低与肺功能下降有关。Bruzzaniti等[19]发现,与肺功能GOLD Ⅲ和Ⅳ级的COPD患者相比,肺功能GOLD Ⅱ级的COPD患者外周血CD4+ FoxP3-all+和CD4+ FoxP3-E2+ pTreg亚群细胞数量更多,CD4+ FoxP3+Treg和CD4+ FoxP3-E2+ pTreg的数量与肺功能呈正相关。COPD患者iTreg亚群的抑制功能随病情进展而逐渐下降。

Treg细胞的促炎及促纤维化作用  CD4+ CD25- Foxp3+ Treg在促炎环境下可促进CD4+T向Th17转化,加重COPD炎症反应。Wu等[20]观察到循环CD4+ CD25- Foxp3+ Treg细胞在稳定型COPD患者中显著增加,且可能是COPD患者持续性气道炎症的原因;TGF-β1可以降低CD25的表达,诱导CD4+ CD25+ Foxp3+ Treg细胞生成CD4+ CD25- Foxp3+ Treg细胞。Sandra等[21]的研究表明,Treg细胞可通过TGF-β自分泌信号通路高表达血小板衍生生长因子-B(platelet-derived growth factor-B,PDGF-B),促进肺纤维化。

综上所述,尽管Th17和Treg的主要作用是对抗的,但在某些情况下发挥协同作用,说明COPD发病机制的复杂性;Th17/Treg失衡与COPD有更密切的作用。

Th17/Treg失衡与COPD   COPD患者体内存在Th17、Treg细胞数量及比例的异常,吸烟引起COPD患者Th17细胞分泌大量的炎症细胞因子,抑制Treg细胞的分化,促进CD4+T细胞向Th17转化,导致Th17/Treg下降。Th17介导的促炎作用增强和Treg发挥的抗炎作用减弱促进COPD发生、发展。Th17/Treg失衡的分子作用机制复杂,且与疾病的严重程度和合并症/并发症密切相关。

Th17/Treg失衡在COPD发生中的机制   研究显示Th17/Treg失衡的机制主要有以下4个方面:(1)DNA甲基转移酶3a(DNA methyltransferase 3A,DNMT3a)通过正向调节c-Jun/AIF1轴调控DC,进而诱导Th17/Treg失衡[22]。(2)体外烟雾暴露可通过增加卷曲分泌蛋白(secreled Frizzled-relaled proteins 2,sFRP2)的水平调控Wnt/β-catenin信号通路,扰乱COPD患者外周血单核细胞(peripheral blood mononuclear cell,PBMC)中的Th17/Treg平衡,干预sFRP2可减弱Th17分化、增强Treg分化[23]。(3)细胞因子信号抑制因子1(cytokine signal suppressor,SOCS1)和3(SOCS3)以及STAT3和STAT5也参与Th17/Treg的失衡。在COPD动物模型中,肺支气管血管周围区域FOXP3+细胞数量与STAT5+和pSTAT5+细胞数量呈正相关[24]。既往研究证实,STAT5可以直接上调FOXP3的基因表达,诱导T细胞向Treg细胞分化;STAT3可诱导T细胞向Th17分化。SOCS3是STAT3的特异性抑制剂,可直接参与酪氨酸激酶2(janus kinase 2,JAK2)/STAT3信号通路,抑制Th17作用[25]。SOCS1可通过调节SOCS3水平和阻断INF-γ信号传导,促进Th17分化;也可能负调节胸腺中FOXP3+细胞的产生[24]。(4)腺苷2a受体(adenosine 2a receptor,A2aR)的激活也可增强下游p-STAT5表达,降低p-STAT3水平,抑制Th17分化及其相关细胞因子的作用,促进Treg分化[26]

Th17/Treg失衡加重疾病进展  Cervillha等[27]在香烟烟雾暴露的动物模型中证实Th17/Treg失衡可导致气道炎症恶化。Sales等[28]发现:在吸烟的COPD患者,小气道的Treg数量减少,TGF-β和IL-10水平降低,IL-17的分泌增加,Th17/Treg失衡与患者的气流阻塞有关。Zheng等[29]发现,在COPD患者的外周血和肺组织中,Th17/Treg显著升高,在AECOPD患者中更加明显。Th17/Treg与FEV1%pred、FVC%pred、FEV1/FVC等呈负相关。Th17/Treg越高,患者的肺功能越差。

Th17/Treg失衡的COPD患者更易发生合并症或并发症。Wang等[30]证实COPD合并2型糖尿病患者外周血Th17及Th17相关细胞因子和转录因子水平较单纯COPD组和与健康组显著升高,Treg及Treg相关细胞因子和转录因子水平较单纯COPD组和健康组显著降低。COPD伴随合并症的患者Th17/Treg失衡较单纯COPD患者更为严重。COPD相关并发症患者体内同样存在严重的Th17/Treg失衡。Zhu等[31]发现COPD并发肺动脉高压患者的IL-17A水平较健康人显著升高,TGF-β的表达较健康人显著降低,Th17/Treg失衡可能与COPD相关肺动脉高压患者体内的Ras鸟苷三磷酸酶(Ras guanosine triphosphatase,Ras-GTPase)激活有关。

Th17/Treg及其平衡与COPD的治疗

基础实验研究

靶向Th17  Christenson等[16]发现气道上皮细胞中IL-17A升高与COPD患者类固醇抵抗有关。Ouyang等[32]证实使用抗IL-17A单克隆抗体,通过消耗促中性粒的集落刺激因子3(colony-stimulating factor 3,CSF3)增强了COPD小鼠对地塞米松的敏感性。Fukuzaki等[33]在弹性蛋白酶诱导的肺气肿模型中,使用抗IL17-A治疗改善了小鼠的肺部炎症。Liang等[34]使用拮抗性CD40抗体阻断了DC和T细胞之间的CD40-CD40L通路,减少了香烟烟雾暴露的COPD小鼠肺组织中Th17、IL-17A和IL-27水平,为COPD免疫炎症治疗提供了新靶点。Li等[35]发现某些中药的复方组合(20-S-人参皂苷Rh1、黄芪甲苷、淫羊藿苷、川陈皮素和丹皮酚)可抑制Th17分化,显著减轻COPD大鼠的炎症反应。

靶向Th17/Treg平衡  Yuan等[36]发现暴露于慢性烟雾的C1q(补体蛋白1复合物的一个组成部分)缺陷小鼠表现出以Th17细胞增加为标志的失控性肺部炎症;C1q重建可以增加Treg丰度,抑制烟雾引起的肺部炎症,并逆转已经存在的肺气肿。香烟烟雾介导的C1q损失可能在外周耐受性降低中起关键作用,有望成为治疗肺气肿的靶点。

Tang等[37]发现红霉素可减少外周血中的Th17细胞,增强Treg反应,改善小鼠肺气肿和肺部炎症。毛喉鞘蕊花植物的异福司可林(isoforskolin,ISOF)是腺苷酸环化酶异构体的有效激活剂,Xiao等[38]的研究表明ISOF可以降低Th17/Treg,改善COPD大鼠的肺组织损伤和肺功能、减轻全身炎症反应。Zhao等[26]明确补肺益肾方通过激活A2aR,抑制Th17细胞分化及其相关细胞因子的分泌,增强Treg细胞分化,改善COPD大鼠的肺功能,减轻肺部炎症。

临床研究  Eich等[39]开展的靶向IL-17A的2期临床试验结果显示,使用抗IL-17A单克隆抗体治疗中重度COPD患者未显示出疗效;在健康受试者中,使用抗IL-17A单克隆抗体中和IL-17A并不能减轻急性臭氧诱导的气道中性粒细胞增多症[40]。相反,阻断IL-17A可能削弱COPD患者的宿主防御能力,诱发或加重细菌感染。

研究显示多种临床药物可通过调节Th17/Treg失衡改善COPD患者的炎症反应,Liu等[41]发现N-乙酰半胱氨酸可通过降低缺氧诱导因子1a(hypoxia-inducible factor-1a,HIF-1a)调节Th17/Treg失衡,改善COPD患者的全身炎症。Xu等[42]纳入80例COPD患者和35例健康人,明确了人参皂苷可通过上调FOXP3调节Th17/Treg,从而改善COPD患者的全身炎症,稳定COPD患者的临床症状。Chen等[43]纳入120例稳定期COPD患者,随机分为安慰剂组和水苏颗粒组,随访1年,结果显示水苏颗粒降低了COPD患者体内Th17和IL-17A,升高了抗炎因子IL-10,减少了COPD患者的急性加重频率。

结语  综上所述,Th17及Treg在COPD中作用不同,两者之间的平衡对COPD至关重要。Th17主要发挥促炎作用,Treg则相反,两者失衡会加重气道炎症、加剧肺功能恶化,并与COPD合并症/并发症密切相关。调控Th17/Treg平衡的机制众多且复杂,涉及miR-21/Smad7/TGF-β、c-Jun/AIF1、Wnt/β-catenin、SOCS及STAT、A2aR等信号通路。针对Th17及Treg的分子靶向治疗正处于动物实验阶段。N-乙酰半胱氨酸、红霉素等药物被证实可以通过调节Th17/Treg平衡改善COPD患者的炎症。

Th17/Treg细胞作为COPD发病中重要的一环,针对Th17/Treg的免疫治疗在COPD中显示出良好前景,但Th17/Treg平衡与健康人免疫功能息息相关,如何减少T细胞介导的损伤,同时又对呼吸道感染产生免疫力,应充分考虑COPD的治疗过程中Th17及Treg细胞的潜在有利及有害影响,这些都值得进一步研究。

作者贡献声明  刘韩韩  文献调研,论文构思和撰写。朱蕾  论文审校和修订。

利益冲突声明  所有作者均声明不存在利益冲突。

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文章信息

刘韩韩, 朱蕾
LIU Han-han, ZHU Lei
Th17/Treg在慢性阻塞性肺疾病中的研究进展
Research progress of Th17/Treg in chronic obstructive pulmonary disease
复旦学报医学版, 2023, 50(1): 147-153.
Fudan University Journal of Medical Sciences, 2023, 50(1): 147-153.
Corresponding author
ZHU Lei, E-mail: tfzhu@126.com.
基金项目
上海市科委医学引导类科技支撑项目(19411969700)
Foundation item
This work was supported by the Medicine-guided Science and Technology Supportive Project of Science and Technology Commission of Shanghai Municipality (19411969700)

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