线粒体质量控制网络失衡在肺动脉高压中的 作用机制及治疗前景
Mechanisms and Therapeutic Prospects of Mitochondrial Quality Control Network Imbalance in Pulmonary Arterial Hypertension
DOI: 10.12677/acm.2026.1631154, PDF, HTML, XML,   
作者: 单红光, 唐任绮, 平松鹤:绍兴大学医学院,浙江 绍兴;叶 涵:浙江大学医学院,浙江 杭州;何 梦*:绍兴市人民医院呼吸与危重症医学科,浙江 绍兴
关键词: 肺动脉高压线粒体动力学线粒体代谢重编程线粒体自噬靶向治疗Pulmonary Arterial Hypertension Mitochondrial Dynamics Mitochondrial Metabolic Reprogramming Mitophagy Targeted Therapy
摘要: 肺动脉高压(PAH)是以肺血管重构和肺动脉压进行性升高为特征的致命性疾病,其发病机制尚未完全阐明。线粒体作为能量代谢、氧化还原稳态及程序性死亡调控的核心细胞器,在PAH的发生发展中发挥关键调控作用。线粒体动力学失衡(分裂增强、融合受损)、代谢重编程(糖酵解优势)及线粒体自噬调控异常并非孤立事件,而是通过“动力学–代谢–自噬”恶性循环闭环协同重塑肺动脉平滑肌细胞(PASMCs)和肺动脉内皮细胞(PAECs)的增殖、凋亡与代谢表型,驱动血管重构。本文从系统生物学视角,整合线粒体质量控制三大核心机制在PAH中的交互网络,梳理靶向该网络的潜在干预策略及最新临床转化进展,以期为PAH的机制研究和临床精准治疗提供新思路。
Abstract: Pulmonary arterial hypertension (PAH) is a fatal disease characterized by pulmonary vascular remodeling and a progressive increase in pulmonary arterial pressure, the pathogenesis of which has not yet been fully elucidated. Mitochondria, as core organelles regulating energy metabolism, redox homeostasis, and programmed cell death, play a critical regulatory role in the occurrence and development of PAH. The imbalance in mitochondrial dynamics (enhanced fission, impaired fusion), metabolic reprogramming (glycolytic shift), and dysregulated mitophagy are not isolated events. Instead, they synergistically reshape the proliferation, apoptosis, and metabolic phenotypes of pulmonary artery smooth muscle cells (PASMCs) and pulmonary artery endothelial cells (PAECs) through a closed-loop “dynamics-metabolism-mitophagy” vicious cycle, driving vascular remodeling. From a systems biology perspective, this article integrates the interactive network of the three core mechanisms of mitochondrial quality control in PAH, reviews potential intervention strategies targeting this network, and discusses the latest advances in clinical translation, aiming to provide new insights into the mechanistic study and precision clinical treatment of PAH.
文章引用:单红光, 唐任绮, 平松鹤, 叶涵, 何梦. 线粒体质量控制网络失衡在肺动脉高压中的 作用机制及治疗前景[J]. 临床医学进展, 2026, 16(3): 3479-3490. https://doi.org/10.12677/acm.2026.1631154

1. 引言

肺动脉高压(pulmonary arterial hypertension, PAH)是一种由多种因素引起的肺血管结构和功能异常,导致肺血管阻力、肺动脉压力进行性升高、右心衰竭甚至死亡的严重综合征[1],全球约1%的人口受累,且疾病负担在低收入国家尤为突出[2]。尽管近年靶向药物(前列腺素类、内皮素受体拮抗剂等)能够在一定程度上改善患者症状与血流动力学指标,但仍无法逆转肺血管重构或显著降低死亡率,反映出其作用机制存在根本性局限[3]

近年来,研究逐渐揭示线粒体在PAH发生发展中的核心地位。线粒体作为细胞能量代谢、氧化应激与凋亡调控的枢纽,其功能异常并非孤立事件,而是体现为动力学失衡(分裂/融合异常)、代谢重编程(如Warburg效应)及自噬清除障碍相互交织的整体网络失调。这一失控的线粒体质量控制网络协同驱动肺动脉平滑肌细胞(pulmonary artery smooth muscle cells, PASMCs)和肺动脉内皮细胞(pulmonary artery endothelial cells, PAECs)的异常增殖与凋亡抵抗,驱动肺血管重构[4]-[6]。本文系统梳理线粒体质量控制网络在PAH中的作用机制,整合最新研究进展,以期为突破现有治疗瓶颈、开发新型多靶点整合策略提供理论依据。

2. 肺动脉高压的病理特征与发病机制

2.1. 疾病定义与分类

根据2022年ESC/ERS指南,PAH定义为海平面静息状态下平均肺动脉压(mean pulmonary arterial pressure, mPAP) > 20 mmHg,并伴有肺血管阻力(pulmonary vascular resistance, PVR) 2 Wood units,且肺动脉锲压15 mmHg [7]。低氧性肺动脉高压(hypoxia pulmonary hypertension, HPH)是慢性缺氧所致肺血管收缩和结构重塑,导致肺动脉压力异常增高的临床综合征,缺氧性肺血管重构是其核心病理基础[8]

2.2. 发病机制

PAH发病机制复杂[9] [10]:(1) 钙信号异常:PASMCs钙内流增加与细胞器钙摄取障碍,导致细胞收缩、增殖及抗凋亡表型;(2) 代谢重编程:在PAH中,肺动脉细胞由高效的氧化磷酸化转向低效的有氧糖酵解(Warburg效应),与线粒体动力学紊乱、金属离子信号异常紧密偶联;(3) 线粒体动力学紊乱:线粒体分裂的增加和线粒体融合的减少,有利于PAMSCs的异常增殖;(4) 遗传与表观遗传因素:骨形成蛋白Ⅱ型受体(bone morphogenetic protein receptorⅡ, BMPRⅡ)突变占遗传性PAH病例的75%、特发性肺动脉高压(idiopathic pulmonary arterial hypertension, IPAH)病例的15%~25% [11];DNA甲基化、非编码RNA均参与基因表达异常[12];(5) 炎症:重构的肺血管周围存在显著的炎症细胞浸润,包括巨噬细胞、T/B淋巴细胞等,这些炎症细胞释放大量细胞因子、趋化因子和黏附分子,导致PAECs损伤和PASMCs增殖[13]

2.3. 现有治疗的局限性

现阶段临床药物主要靶向NO、前列环素、内皮素三途径,以改善血管舒缩为主,对逆转血管重塑作用有限[14]。规范化靶向治疗虽将3年生存率提升至76%,但7年生存率仅49.0% [15] [16]。因此,深入解析线粒体相关机制,开发针对质量控制网络的整合性治疗策略,是突破现有瓶颈的关键方向。

3. 线粒体动力学失衡:结构网络的崩溃

3.1. 线粒体动力学的基本概念

线粒体通过持续的分裂与融合维持自身动力学稳态,这一动态过程称为线粒体动力学。线粒体分裂由胞浆动力相关蛋白DRP1 (dynamin-related protein 1, Drp1)介导,其在Ser616位点磷酸化后被激活,转移至线粒体外膜(mitochondrial outer membrane, OMM),与OMM上的线粒体分裂蛋白1 (fission 1, FIS1)、线粒体分裂因子(mitochondrial fission factor, MFF)、线粒体动力蛋白49/51 (mitochondrial dynamics protein of 49 kDa, MID49/51)结合,促进线粒体缢裂[4]。分裂可增加线粒体数量,也可隔离受损线粒体以启动自噬清除[17]。线粒体融合则依赖于OMM的线粒体融合蛋白1/2 (mitofusin 1/2, MFN1/2)以及线粒体内膜(mitochondrial inner membrane, IMM)的视神经萎缩蛋白1 (optic atrophy 1, OPA1)。MFN1/2通过GTP酶活性介导外膜融合,OPA1则调控内膜融合,两者协同维持线粒体网络的连续性,促进线粒体间物质交换与功能互补[17] [18]。分裂与融合的动态平衡对维持线粒体DNA完整性、能量代谢稳态及细胞命运决定至关重要[19]

3.2. PAH中的线粒体动力学失衡表现

3.2.1. PASMCs的分裂亢进与“凋亡抵抗”表型

PASMCs中Drp1表达及Ser616磷酸化水平显著升高,而融合蛋白MFN2和OPA1表达下调,导致线粒体网络碎片化[20]-[22]。这种过度分裂表型通过多重机制促进细胞增殖与凋亡抵抗:① HIF-1α/Notch信号激活——缺氧条件下,Drp1介导的线粒体分裂通过稳定HIF-1α,激活Notch通路,上调CyclinD1等增殖相关基因表达[4]。② ROS/Drp1正反馈环路——缺氧诱导的活性氧(reactive oxygen species, ROS)促进Drp1线粒体转位,而分裂又进一步增加ROS生成,形成恶性循环[5] [23]。③ 凋亡信号抑制——线粒体碎片化减少细胞色素c释放,抑制caspase-3激活[24],同时Mfn2下调激活PI3K/AKT通路,共同导致凋亡抵抗[25]

3.2.2. PAECs的融合缺陷与内皮功能障碍

与PASMCs不同,PAECs主要表现为MFN2下调导致的融合不足。线粒体网络断裂影响钙信号传导和内皮型一氧化氮合酶活性降低,NO生成减少,血管舒张能力减弱[24]。此外,分裂异常激活NF-κB通路,促进炎症因子表达,加剧内皮损伤和血栓形成[26]

3.3. 分子调控网络

翻译后修饰:在PAH中,缺氧通过HIF-1α/CDK1轴促进Drp1 Ser616磷酸化驱动分裂亢进,PI3K/AKT通路介导Ser637磷酸化抑制分裂[4]

受体蛋白协同:PAH中MiD49/51表达显著升高,与Drp1形成环形裂变装置,放大线粒体分裂信号,下调MiD49/51可恢复线粒体融合,逆转PASMCs的“假肿瘤”表型[27]

氧化应激与表观遗传:ROS通过氧化Drp1半胱氨酸残基增强其活性[5],MiD49/51启动子低甲基化可上调分裂相关基因表达[28],共同维持动力学失衡。

线粒体动力学失衡是PAH血管重构的早期事件,通过影响能量代谢、氧化应激和细胞命运决定,驱动疾病进展。靶向Drp1磷酸化、MiD49/51或MFN2等关键节点,可能成为逆转线粒体网络稳态的新策略。

4. 线粒体代谢重编程:能量、底物与离子稳态的全面失衡

4.1. 能量代谢途径重塑:Warburg效应

4.1.1. TCA循环抑制与PDK/PDH轴调控

线粒体动力学失衡导致的网络碎片化引发能量代谢的深刻改变——即从高效的氧化磷酸化转向低效但有氧糖酵解(Warburg效应)。PAH患者及动物模型中,PASMCs和PAECs的三羧酸(tricarboxylic acid cycle, TCA)循环通量显著降低,表现丙酮酸脱氢酶激酶(pyruvate dehydrogenase kinase, PDK)表达上调,磷酸化抑制丙酮酸脱氢酶(pyruvate dehydrogenase, PDH),阻断丙酮酸向乙酰辅酶A的转化,致使TCA循环底物耗竭[29] [30]。临床研究显示,PDK抑制剂二氯乙酸酯(dichloroacetate, DCA)可恢复PDH活性,降低PAH患者平均肺动脉压并改善运动功能,证实TCA循环异常在PAH中的致病作用[31]

4.1.2. 电子传递链功能障碍与ROS爆发

ETC复合物Ⅰ、Ⅱ、Ⅲ活性降低,ATP生成减少[32];复合物Ⅲ的醌氧化位点(Qo)异常激活,促使电子泄漏并与氧结合生成过量线粒体活性氧(mitochondrial reactive oxygen species, mtROS) [33] [34]。研究证实,线粒体Rieske铁硫蛋白(RISP)在缺氧条件下特异性募集至复合物Ⅲ,是缺氧性ROS爆发的关键来源,驱动肺血管收缩[35]。过量mtROS通过氧化损伤线粒体DNA、激活HIF-1α/NF-κB、氧化失活K+通道致Ca2+超载等多途径推动PAH进展[35] [36]。临床研究发现,PAH患者血清中超氧化物歧化酶(SOD)及过氧化氢酶(CAT)活性降低,抗氧化能力显著减弱,进一步加剧氧化还原失衡[37]

4.2. 代谢底物利用转换:支持生物合成的替代途径

4.2.1. 谷氨酰胺代谢的代偿性增强

PAH小鼠PAECs中谷氨酰胺酶表达上调,驱动谷氨酰胺分解为α-酮戊二酸进入TCA循环,同时为核酸、脂质等生物大分子合成提供碳骨架[38] [39]。抑制谷氨酰胺酶可显著减弱PAECs增殖及血管重塑,提示谷氨酰胺代谢可能成为纠正TCA循环异常的治疗靶点[39]

4.2.2. 脂代谢与核苷酸代谢的联动改变

PAH中的脂代谢呈现从分解向合成的系统性转变。代谢组学分析显示,PAH患者血浆磷脂酰胆碱、鞘磷脂下调,肺组织鞘脂代谢物上调[40] [41]。鞘氨醇激酶1 (SphK1)及其产物S1P的表达上调,通过激活ERK等通路直接驱动肺动脉平滑肌细胞增殖[42];脂肪酸合酶(FAS)的活化促进脂肪酸从头合成[43]β-氧化受损致长链酰基肉碱累积,提示线粒体脂质利用障碍[44] [45]。在核苷酸代谢方面,代谢组学研究揭示血浆tRNA特异性修饰核苷(N1-甲基肌苷、N2,N2-二甲基鸟苷)升高[40],腺苷一磷酸(AMP)水平降低[46],削弱AMPK抑增殖作用及NO生成[47]。磷酸戊糖途径(PPP)作为代谢枢纽,提供核糖-5-磷酸及NADPH,同时满足核苷酸与脂肪酸合成的巨量需求[48] [49]。转录层面,HIF-1α、癌基因MYC及固醇调节元件结合蛋白(SREBPs)协同上调糖酵解、PPP及脂质/核苷酸合成酶系,实现合成代谢程序化调控[50]-[52]

4.3. 线粒体离子稳态失衡:代谢反应的调控枢纽紊乱

钙信号异常:缺氧诱导内质网应激,破坏“内质网–线粒体单元”钙转运通道,线粒体钙摄取减少,胞质钙浓度升高[36] [53]。胞质钙超载激活钙调磷酸酶-NFAT通路,促进增殖细胞核抗原(proliferating cell nuclear antigen, PCNA)表达,驱动PASMCs增殖;线粒体钙缺乏抑制丙酮酸脱氢酶、异柠檬酸脱氢酶活性,进一步抑制TCA [36]。线粒体钙单向转运体(mitochondrial calcium uniporter, MCU)与钠钙交换(mitochondrial Na+/Ca2+ exchanger, NCX)功能失衡:PAH中MCU介导钙摄取增加可致线粒体钙超载、膜电位下降及通透性转换孔(mPTP)开放;NCX功能异常阻碍钙排出,形成“钙超载–膜电位崩溃”闭环[54]

铁离子稳态与铁死亡:铁是线粒体合成血红素和组装铁硫簇(如ETC复合物Ⅰ、Ⅱ、Ⅲ中的铁硫中心)的必需元素。缺氧下复合物Ⅲ RISP异常募集是mtROS重要来源[35]。线粒体内游离Fe2+扩大,可通过芬顿反应催化脂质过氧化物生成高活性的脂质自由基,引发致命的膜脂损伤——即铁死亡[55]。当粒体主要的抗氧化防御酶——谷胱甘肽过氧化物酶4 (GPX4)失活时触发铁死亡,直接损伤内皮细胞并释放DAMPs加剧炎症,参与血管重构[56] [57]

镁离子稳态:镁离子是天然钙拮抗剂和ATP酶的必需辅因子。PASMCs中镁外流增加或通过TRPM7、MagT1通道摄取受阻[58],细胞内游离镁浓度的降低产生多重影响:胞内低镁削弱对电压门控钙通道(VGCC)的抑制,间接加剧钙超载[59];ATP的合成与利用均依赖于Mg2+,低镁状态可能迫使细胞更加依赖糖酵解,从而巩固Warburg样代谢重编程[60];低镁降低超氧化物歧化酶(SOD)等抗氧化酶的活性,削弱细胞的整体抗氧化防御能力,使得线粒体更易遭受ROS的持续性攻击[61]

锌离子稳态:锌作为多种金属酶和锌指结构蛋白的必需辅因子,其胞内浓度精密调控。HIF-1α上调锌转运蛋白ZIP12 (SLC39A12)表达,致PASMCs锌异常累积[62]。过量锌置换铁硫簇中心铁原子,抑制复合物Ⅰ/Ⅲ活性,诱导线粒体ROS爆发[63];同时作为第二信使激活PI3K/AKT及ERK通路,直接驱动ASMCs的增殖与迁移表型[64]

5. 线粒体自噬调控障碍——质量控制的失效

5.1. 线粒体自噬的核心机制与生理功能

线粒体自噬是细胞选择性清除受损线粒体的关键过程,主要通过以下两大通路实现精准调控:(1) PINK1/Parkin依赖通路:当线粒体膜电位降低时,丝氨酸/苏氨酸激酶PINK1稳定于OMM并磷酸化激活E3泛素连接酶Parkin,介导线粒体膜蛋白泛素化,进而招募自噬受体(如p62)与LC3结合,促使受损线粒体被自噬体包裹降解[65]。(2) 受体介导的非经典通路:缺氧应激下,BNIP3、FUNDC1等受体蛋白通过LIR (LC3-interacting region, LIR)结构域直接与LC3结合,无需Parkin参与即可介导线粒体自噬。该通路在缺氧诱导的PAH中尤为关键,其过度激活或抑制均可能打破线粒体稳态[66]

5.2. PAH中线粒体自噬的双重失调

5.2.1. 肺动脉平滑肌细胞的自噬不足与损伤积累

PAH患者及动物模型中,PASMCs呈现PINK1/Parkin通路活性抑制、自噬标志物(如Beclin-1)表达下调,导致受损线粒体持续堆积[67]。堆积的线粒体释放ROS激活NF-κB,促进PASMCs异常增殖并抑制凋亡[68];氧化应激通过mTOR通路进一步抑制自噬,形成“损伤–自噬抑制”正反馈[69];自噬不足迫使细胞转向糖酵解供能,乳酸堆积促进血管平滑肌细胞表型转化[70]。雷帕霉素(mTOR抑制剂)干预可激活自噬,减少PASMCs线粒体碎片化,缓解PAH进展[71]

5.2.2. 肺动脉内皮细胞的自噬过度与功能耗竭

PAH中PAECs常表现为BNIP3/FUNDC1介导的自噬过度激活,线粒体过度清除致细胞能量耗竭,紧密连接蛋白ZO-1表达降低,血管通透性增加[72] [73];同时血管内皮生长因子(VEGF)信号受损,导致PAH特征性的“血管丛”样病变[74]。敲除BNIP3或使用小分子抑制剂(如FUNDC1-siRNA)可减少线粒体过度降解,改善内皮依赖性舒张功能,提示精准抑制过度自噬具有治疗潜力[75]

5.3. 恶性循环的交汇点:动力学、代谢与自噬的交互作用

线粒体自噬与动力学(融合/分裂)的协同失衡是PAH线粒体质量控制失效的核心机制,也是PAH病理进展的核心环节,其交互作用表现为:

1) 动力学异常驱动自噬功能紊乱:RhoA/ROCK通路促进Drp1磷酸化募集,过度分裂超出细胞自噬清除能力,致损伤线粒体堆积;同时,BMPR2突变可抑制Mfn2表达,线粒体融合不足使受损线粒体无法通过融合修复,进一步加重自噬负担[76] [77]。线粒体碎片化还直接导致ETC复合物组装异常,增强ROS生成,而Drp1抑制剂Mdivi-1可通过减轻线粒体分裂,改善PAH模型中的肺血管收缩[78]

2) 自噬缺陷反馈加剧动力学失衡:PASMCs中自噬相关基因(ATG5, Beclin-1)表达虽上调,但PINK1/Parkin募集异常,受损线粒体无法有效识别清除[67]。堆积的线粒体释放ROS,通过磷酸化修饰激活Drp1并抑制Mfn2,形成“分裂–损伤–分裂”的自我增强闭环[79]。研究显示,抑制过度自噬(如使用自噬抑制剂3-MA)有时可恢复部分代谢功能[80],提示自噬通量调节的复杂性。

3) AMPK/mTOR通路的交叉调控:该通路同时调控自噬激活与线粒体动力学蛋白表达,PAH中mTORC1过度激活可协同抑制自噬、促进线粒体过度分裂,全面瓦解质量控制网络[81] [82]

动物实验显示,联合应用Drp1抑制剂(Mdivi-1)与PINK1/Parkin通路激活剂可更有效恢复线粒体形态与自噬功能,协同减轻肺血管重构,疗效优于单一药物[83],这从治疗角度印证了同时纠正动力学失衡与自噬障碍的重要性。

6. 靶向线粒体的治疗策略探索

6.1. 动力学调节剂:纠正分裂与融合的失衡

Drp1抑制剂:其抑制剂Mdivi-1阻断Drp1寡聚化及GTP酶活性,减少线粒体分裂,在缺氧PAH模型中减轻PASMCs增殖和右心肥厚[84],但该分子存在明显的脱靶效应,可非特异性抑制线粒体复合物Ⅰ、干扰细胞整体GTP酶活性,且对Drp1的抑制缺乏亚型选择性,易引发心肌、骨骼肌等正常组织的线粒体功能紊乱[85]。为克服上述缺陷,更具选择性的干预方向已成为研究重点:一是通过遗传学验证,利用CRISPR/Cas9技术特异性敲除PASMCs中的Drp1或其受体蛋白(如MiD49/51),明确靶点病理特异性,排除非特异性抑制的干扰[27];二是开发线粒体靶向递送系统,鉴于Drp1在全身广泛表达,利用纳米载体(如脂质体、多聚物纳米粒)或细胞特异性适配体,将抑制剂靶向递送至肺血管PASMCs,实现精准干预、减少系统性副作用;三是探索新一代高选择性抑制剂,通过精准结合Drp1不同功能域(如GTP酶结构域),大幅减少对其他蛋白的非特异性作用[85]

Mfn2激动剂:Mfn2的表达下调不仅是导致线粒体网络断裂的原因,更能直接驱动细胞代谢向糖酵解转换[86]。因此,恢复Mfn2功能或表达,能够同时改善线粒体形态和代谢功能,实现“一石二鸟”的治疗效果,这体现了靶向单一节点却能调控多通路的新思路。

6.2. 自噬调控药物:实施细胞特异性的精准干预

自噬激活剂:线粒体自噬在PAH中存在细胞类型特异性失调,要求干预策略具备精准性。在自噬不足的PASMCs中,旨在增强清除能力的药物是研究重点。雷帕霉素及新型线粒体靶向雷帕霉素衍生物(Mito-Rapa)增强PINK1/Parkin通路,清除受损线粒体,降低PAH动物模型的肺动脉压[87]

自噬抑制剂:相反,在自噬可能过度的PAECs中,则需要防止线粒体的过度降解。研究表明,使用自噬抑制剂如羟氯喹可抑制自噬过度,保护PAECs免受缺氧诱导的线粒体过度清除,改善内皮功能[88]

6.3. 线粒体代谢调节剂:逆转能量与合成代谢的异常

PDK抑制剂:DCA通过激活PDH,促进葡萄糖氧化,逆转糖酵解优势,早期临床研究中显示出改善PAH患者血流动力学和运动能力的潜力[31]

剂线粒体靶向抗氧化剂:MitoQ能清除mtROS,减轻氧化应激,在临床前大动物模型中逆转机械缺氧所致内皮功能障碍[89]

代谢调节剂:曲美他嗪抑制线粒体脂肪酸氧化,促进葡萄糖氧化,改善能量代谢失衡,临床研究显示辅助治疗价值[37]

6.4. 联合治疗策略

多靶点药物联用:Mdivi-1与雷帕霉素联用,在缓解肺血管重构和右心肥厚方面具有协同效应,其效果优于单一用药[20]。这种“动力学调节 + 质量控制增强”的组合策略,旨在系统性地恢复线粒体稳态。

新型多靶点功能分子的开发:研究人员正致力于设计能同时作用于多个环节的单一化合物。例如,2025年报道的一种新型化合物SUL-150,在PAH动物模型中不仅能限制肺血管重塑,还能直接改善右心室功能,表现出对心肺的双重保护作用[90]

靶向细胞器交互界面:线粒体–内质网的接触位点(MAMs)是钙交换、脂质代谢和动力学调控的关键枢纽。稳定MAMs结构或调节相关蛋白有望从上游系统性修复多种线粒体功能障碍,代表了整合治疗的前沿方向[91]

临床转化中的挑战与启示:尽管临床前研究充满希望,但转化之路并非坦途。例如,钠–葡萄糖协同转运蛋白2抑制剂恩格列净在临床前研究中显示出通过改善线粒体生物合成减轻肺血管重构的潜力,但2025年的一项初步临床研究却未能在PAH患者中观察到一致获益[92]。这凸显了疾病复杂性、患者异质性以及从动物模型到人体疗效之间的差距,为未来整合策略的个性化设计提供了重要警示。

6.5. 线粒体质量控制网络枢纽节点的筛选

上述治疗策略的探索表明,线粒体质量控制网络的复杂性决定了单一靶点干预的局限性。如何从众多异常分子中筛选出最核心的“枢纽节点”,即能同时调控线粒体动力学、代谢重编程、自噬三大模块,且具备高证据等级、高可药性的核心靶点,是优化现有策略、设计新一代联合治疗方案的关键前提。其筛选依据为四级排序标准:① 证据等级:优先选择有人群/组织水平验证(PAH患者样本中靶点表达/活性异常)、动物模型重复验证、细胞水平机制明确的靶点;② 重复验证次数:筛选被≥3个独立研究团队在不同PAH模型(低氧、野百合碱、BMPR2突变)中验证过的靶点;③ 干预可药性:优先选择具备小分子调节剂、基因编辑工具、靶向递送系统等多种干预手段的靶点;④ 多模块调控能力:筛选能同时影响“动力学–代谢–自噬”中≥2个模块的靶点。

7. 挑战与展望

7.1. 基础研究的瓶颈

线粒体动力学与自噬在不同细胞类型(如平滑肌vs内皮细胞)中的差异调控机制尚不完全明确。遗传背景(如BMPR2突变)如何影响线粒体功能的分子机制需深入研究。

7.2. 临床转化的挑战

现有小分子工具药(如Mdivi-1)存在脱靶效应,亟需开发高亚型选择性、器官靶向性调节剂;如何通过循环标志物或分子影像无创评估患者线粒体功能状态、实现个体化治疗仍是未解难题。

7.3. 未来研究方向

整合单细胞测序与空间转录组学,解析PAH肺血管中不同细胞亚群的线粒体异质性及细胞间通讯;探索线粒体DNA甲基化、RNA修饰等表观遗传层面对动力学与自噬的调控;开展基于网络药理学及功能性标志物的多靶点联合治疗临床试验,系统评估长期疗效与安全性。

8. 结论

线粒体动力学失衡、代谢重编程及自噬调控异常并非独立事件,而是通过紧密交互、互为因果的恶性循环闭环,构成PAH线粒体质量控制的三大核心缺陷。该网络通过协同重塑PASMCs与PAECs的增殖、凋亡及代谢表型,最终驱动不可逆的肺血管重构。靶向线粒体网络的多节点联合干预策略在临床前研究中展现出显著优势,但向临床转化仍面临靶点特异性、患者分层及疗效预测等诸多挑战。未来应融合系统生物学、化学生物学与精准医学理念,推动从机制解析到临床治疗的全链条创新,为PAH患者带来突破性的治疗希望。

NOTES

*通讯作者。

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