原发性醛固酮增多症肾上腺皮质腺瘤的 分子机制研究进展
Research Progress on the Molecular Mechanisms of Aldosterone-Producing Adrenocortical Adenomas in Primary Aldosteronism
摘要: 原发性醛固酮增多症(PA)是一种因肾上腺皮质自主分泌过量醛固酮导致的内分泌性高血压疾病,其中心亚型——分泌醛固酮的肾上腺皮质腺瘤(APA)具有高度异质性和复杂分子机制。近年来,随着高通量测序技术的发展,APA的分子机制研究取得重要进展。本文系统综述了APA在流行病学、诊断挑战、基因表达特征及分子分型等方面的最新研究。流行病学数据显示PA在高血压人群中患病率可达5%~20%,且与心血管风险显著相关。分子机制上,约90%的APA存在体细胞突变,涉及KCNJ5、CACNA1D、ATP1A1、ATP2B3等基因,这些突变通过影响离子通道功能导致细胞内钙信号异常激活,进而驱动醛固酮合成限速酶CYP11B2高表达。全转录组分析进一步揭示了基于不同驱动突变的分子亚型(如KCNJ5突变型、CACNA1D突变型和CTNNB1突变型),各亚型具有独特的转录特征与临床表型。这些机制研究已逐步转化为临床实践,包括CYP11B2免疫组化病理诊断、基因分型指导治疗决策以及新型PET示踪剂的开发。未来,通过多组学整合与空间转录组学等技术,有望实现APA的精准分型与个体化治疗,改善患者预后。
Abstract: Primary aldosteronism (PA) is an endocrine hypertensive disorder caused by autonomous excessive secretion of aldosterone from the adrenal cortex. Its central subtype, the aldosterone-producing adrenocortical adenoma (APA), exhibits high heterogeneity and complex molecular mechanisms. In recent years, significant progress has been made in understanding APA pathology with the advancement of high-throughput sequencing technologies. This review systematically summarizes the latest research on APA regarding epidemiology, diagnostic challenges, gene expression characteristics, and molecular classification. Epidemiological data indicate that PA affects 5%~20% of hypertensive populations and is significantly associated with increased cardiovascular risk. At the molecular level, approximately 90% of APAs harbor somatic mutations involving genes such as KCNJ5, CACNA1D, ATP1A1, and ATP2B3. These mutations impair ion channel function, leading to aberrant activation of intracellular calcium signaling, which in turn drives the overexpression of CYP11B2 (the rate-limiting enzyme in aldosterone synthesis). Whole-transcriptome analyses have further identified molecular subtypes based on distinct driver mutations (e.g., KCNJ5-mutant, CACNA1D-mutant, and CTNNB1-mutant subtypes), each characterized by unique transcriptional signatures and clinical phenotypes. These mechanistic insights have gradually translated into clinical practice, including CYP11B2 immunohistochemistry for pathological diagnosis, genetic profiling to guide therapeutic decisions, and the development of novel PET tracers. Future integration of multi-omics approaches and spatial transcriptomics is expected to enable precise molecular subtyping and personalized treatment of APA, ultimately improving patient outcomes.
文章引用:Kyoe Kyar San, 李志鹏. 原发性醛固酮增多症肾上腺皮质腺瘤的 分子机制研究进展[J]. 临床医学进展, 2026, 16(3): 592-599. https://doi.org/10.12677/acm.2026.163826

1. 引言

原发性醛固酮增多症(Primary Aldosteronism, PA)是由于肾上腺皮质自主分泌过量醛固酮,导致肾素–血管紧张素系统被抑制[1]。分泌醛固酮的肾上腺皮质腺瘤(Aldosterone-Producing Adenoma, APA)和双侧肾上腺增生(BIH)是PA最主要的病理亚型。已有研究表明,现有筛查手段检出肾上腺肿瘤最终为ACA的确诊率高达96% [2]。但含有脂肪组织并且血管丰富的肾上腺转移瘤和嗜铬细胞瘤在临床及影像学表现不典型时,易被误诊为ACA [3] [4],甚至导致医疗不良事件,因此,在临床医师诊疗过程中需要更准确的诊断。近年来在分子机制研究方面取得了突破性进展,这些分子机制的阐明为PA的精准诊断、早期筛查和靶向治疗提供了新的方向,特别是通过转录组和表观遗传学分析,有望实现更有效的个体化治疗策略[5]。本文旨在综述近年来APA在基因表达与分子机制方面的核心研究进展。

2. 原发性醛固酮增多症被低估的公共健康问题(流行病学)

PA主要表现为高血压、低钾血症(或正常血钾),也是继发性高血压根本原因[1] [6]。过去曾被认为是罕见病,但近二十年的流行病学数据彻底改变了这一认知。在高血压门诊中,PA的患病率约为5%~10%,而在难治性高血压、高血压合并自发性或利尿剂所致低钾血症、高血压合并肾上腺意外瘤以及早发性高血压或有PA家族史的患者中,其患病率可高达20%以上[7] [8]。PA的重要性远不止于其患病率。与年龄、性别和血压水平相匹配的原发性高血压患者相比,PA患者罹患脑卒中、心肌梗死、心房颤动、心力衰竭和肾功能不全的风险显著增加[9] [10]。这种过高的心血管风险被认为与醛固酮的独立病理作用有关,包括促进纤维化、炎症和内皮功能障碍。因此,早期识别和针对性治疗PA,对于降低心脑血管事件负担具有重大公共卫生意义。

3. 原发性醛固酮增多症诊断现状及挑战

3.1. 当前诊断流程

PA诊断包括筛查(目前国内外均推荐以血浆醛固酮/肾素比值(ARR)作为首选的筛查指标) [11]、确认(主要包括氟氢可的松试验、口服钠负荷试验、生理盐水输注试验(saline infusion test, SIT)及卡托普利试验(captopril challenge test, CCT)) [12]和分型(侵入性检查:肾上腺静脉采血(AVS)、无创影像学检查:肾上腺增强CT薄层扫描、高准确率的新型无创检查–核医学PET-CT、基因检测和病理诊断) [13]三个步骤。

3.2. 面临的挑战

ARR筛查主要依赖于血浆醛固酮/肾素比值,ARR的准确性受检测方法局限性的显著影响[14];确诊试验(如盐水输注试验、卡托普利试验等)虽能提高特异性[15],但其操作标准化、判断界值及在不同亚型中的敏感性仍存争议[13];AVS虽被国内外指南推荐为原醛分型诊断的金标准,但AVS是一项技术难度高、有创且昂贵的操作[16];高准确率的新型无创检查–核医学PET-CT:PET/CT具有较高的病变检测和表征潜力,且具有良好的重复性,但核医学检查价格高昂,整体灵敏度相对较低,且并非所有医疗机构都能开展该项技术[17]

4. 肾上腺皮质腺瘤:从病理描述到分子解构

APA是PA的主要亚型,也是肾上腺切除术能够根治的主要亚型[18] [19]。传统上,APA被视作肾上腺皮质球状带来源的良性上皮性肿瘤,通过改变肾上腺皮质球状带细胞的离子稳态(尤其是细胞内钙离子浓度),异常激活醛固酮合成限速酶CYP11B2的表达,但是无法完全解释肿瘤生长、增殖及与瘤旁组织的动态相互作用。APA的发生是一个多步骤、多基因参与的复杂过程,涉及转录组水平的全局性重编程。全转录组分析技术,尤其是高通量RNA测序,能够无偏倚地检测组织中所有转录本(包括mRNA、lncRNA、circRNA、miRNA等)的表达丰度和结构变异,为系统揭示APA的转录组特征提供了前所未有的机会[20] [21]

5. APA差异表达基因与通路

5.1. 离子通道与转运体相关基因的异常表达

APA曾被视为一个分子机制相对单一的疾病,但近年来研究揭示其高度的异质性。约90%的APA存在体细胞突变,主要涉及KCNJ5、CACNA1D、ATP1A1、ATP2B3等基因[22]

KCNJ5:最常见的突变基因(约占40%),编码G蛋白敏感的内向整流钾通道Kir3.4。热点突变(如p.Gly151Arg, p.Leu168Arg)破坏其离子选择性,导致钠离子内流、细胞膜持续去极化,电压门控钙通道(VGCC)随之开放,引起钙内流[23]

CACNA1D:编码L型电压门控钙通道Cav1.3亚基,突变(如p.Gly403Asp)使其更易激活或失活减慢,导致基础钙内流增加[24]

ATP1A1与ATP2B3:分别编码Na+/K+-ATP酶α1亚基和质膜钙ATP酶3 (PMCA3)。其突变通过削弱钠泵功能或钙泵出能力,间接导致细胞内钠蓄积、膜电位去极化及钙离子清除障碍[25]

5.2. Wnt/β-Catenin通路基因突变

CTNNB1:编码β-catenin蛋白,其突变(如p.Ser45Pro)导致蛋白稳定性增加,在细胞核内累积,组成性激活Wnt/β-catenin信号通路。该通路主要促进细胞增殖,与腺瘤形成密切相关,对醛固酮合成的直接驱动作用较弱[26]

6. 全转录组视野下的基因表达特征与分子亚型

6.1. 全转录组的认识

全转录组(Whole Transcriptome)分析旨在捕获编码和非编码RNA,并对细胞、组织、器官甚至整个身体的基因表达的异质性进行量化,在破译基因组结构和功能、确定细胞、生理、生化和生物系统的遗传网络以及建立应对疾病、病原体和环境挑战的分子生物标志物方面发挥着重要作用[21]。研究的可靠性很大程度上取决于样本质量。理想的对照是同一患者同侧肾上腺的瘤旁组织(Peri-tumoral Adjacent Cortex, P-ADR),可最大程度消除个体间遗传背景差异。数据分析流程通常包括:质控、序列比对、基因表达定量、差异表达分析(如DESeq2, edgeR)、功能富集分析(GO, KEGG)、加权基因共表达网络分析(WGCNA)以及竞争性内源RNA(ceRNA)网络构建等[27]。整合基因组(突变信息)与转录组数据,可建立基因型–表型关联。

6.2. 基于驱动突变的分子亚型及其表达谱

不同的驱动突变定义了具有独特转录特征的APA亚型:

(1) KCNJ5突变型:通常表现为更高水平的CYP11B2表达和更强的醛固酮合成能力。其转录组特征还包括细胞外基质重塑、细胞粘附相关基因的上调,以及更高的肿瘤内异质性。单细胞测序技术进一步揭示了KCNJ5突变肿瘤内存在醛固酮高合成细胞与增殖细胞亚群[28]

(2) CACNA1D突变型:其转录特征与持续钙信号激活高度一致,但与KCNJ5型存在差异。

(3) CTNNB1突变型:特征为Wnt/β-catenin通路靶基因(如AXIN2,LEF1)的显著富集,细胞周期相关通路更为活跃。

6.3. 体细胞突变与离子稳态崩溃

KCNJ5、CACNA1D、ATP1A1、ATP2B3等通过影响离子通道功能,导致肾上腺球状带细胞膜电位异常(去极化)和细胞内钙离子浓度持续升高,高钙信号作为核心第二信使,激活钙调蛋白/CaMK和钙调磷酸酶/NFAT两条关键信号轴。这些信号级联反应最终使醛固酮合成限速酶基因CYP11B2的剧烈上调,促进醛固酮过度生成。

6.4. 关键失调的信号通路

(1) 类固醇合成通路:APA显著上调CYP11B2 (醛固酮合酶)、HSD3B2和CYP21A2,同时下调CYP17A1,呈现“去17α-羟化”特征,使代谢流向醛固酮而非皮质醇。DACH1和LGR5在瘤旁肾小球带(ZG)高表达,在APA中显著下调,分别通过TGF-β/Smad和Wnt/β-catenin通路抑制醛固酮合成,其失活构成APA自主分泌的基础[29]

(2) 细胞增殖与信号通路:空间转录组学揭示APA存在两种转录亚型:CYP11B2-type 1保留ZG特征(KCNJ5、VSNL1高表达,富集TP53通路和氧化应激反应),而CYP11B2-type 2呈现束状带(ZF)样特征(CYP17A1、CYP11B1高表达),富集mTORC1和缺氧信号,多见于KCNJ5突变型APA [30]。单细胞分析显示APA细胞沿假时间轨迹向两个分化命运演进,伴随CTNNB1 (Wnt信号)、CALM2 (钙信号)及FTH1 (铁死亡抑制)的上调[31] [32]

(3) 细胞外基质与免疫微环境:NPNT (肾连蛋白)作为ZG特异性细胞外基质蛋白,在APA中选择性高表达并与Wnt通路双向调控,其沉默通过下调BCL2诱导凋亡,提示ECM重塑参与肿瘤生长。免疫浸润研究显示APA免疫微环境相对“冷”状态,但瘤周ZG区呈现Shh信号显著激活和干细胞/祖细胞标志物(CD56、β-catenin)再表达,提示肿瘤前体细胞状态[33]。miR-203在APA中下调,通过靶向WNT5A解除对醛固酮分泌的抑制,且血浆WNT5A水平可定位肿瘤侧别[34]

7. 国内外研究现状

早期研究依赖于基因芯片技术,但其通量有限,且只能检测已知序列。二代测序技术的成熟,使得全转录组RNA测序(RNA-seq)成为主流[35]。单细胞RNA测序(scRNA-seq)和空间转录组学的兴起,进一步将研究精度从组织水平提升至细胞水平和空间微环境层面,能够解析APA肿瘤内细胞亚群的异质性、识别致病细胞类型及其与微环境的相互作用。

中国学者在APA分子领域做出了重要贡献。早期证实了KCNJ5突变在中国PA患者中的高频率(可达60%以上),并详细描述了其临床特征[36]。在对CACNA1D和ATP1A1突变探索中,国内团队也验证并分析了其在人群中的分布特点。近年来,国内多个中心开展了基于RNA-seq的转录组学研究,系统描绘了中国APA患者的转录组图谱,发现了具有人群特异性的非编码RNA标志物,并积极利用机器学习方法构建诊断模型[37] [38]。在单细胞研究方面,国内团队也正积极布局,旨在揭示APA的细胞生态系统。

8. 从机制到临床:分子研究的转化意义

原发性醛固酮增多症的病理与发病机制是一个从基因突变到离子通道功能障碍,再到细胞内信号转导异常、转录重编程,最终导致细胞自主分泌与增殖表型的完整链条。这一机制的理解已深刻改变了临床实践。

8.1. 分型

基因分型正逐渐用于预测手术预后和指导治疗决策[36] [39]。新版共识建议年龄 < 20岁,有原醛家族史或早发脑卒中家族史者应做基因检测,确定是否为糖皮质激素可抑制性醛固酮增多症。因为家族性醛固酮增多症则与种系突变相关:FH I型为CYP11B1/CYP11B2嵌合基因所;FH II型涉及CLCN2基因突变;FH III型和IV型分别与KCNJ5和CACNA1H基因突变有关[40]

(1) KCNJ5突变型(约占40%~50%):KCNJ5突变是高血压治愈的最佳预测因子。Kitamoto等发现KCNJ5突变型APA患者术后高血压缓解率达85.2%,显著高于野生型(60%),且与年轻、高血压病程短、用药少、血醛固酮水平高独立相关[41]。对术前高度怀疑为KCNJ5突变型的年轻、单侧大腺瘤患者,手术获益预期更明确。

(2) CACNA1D与ATP1A1/ATP2B3突变型(合计约占30%~40%):转录组上显示更强烈的钙信号通路激活和离子稳态失衡特征。这类患者多为老年男性,肿瘤常较小。其临床意义在于,由于突变直接作用于钙信号通路,该亚型对二氢吡啶类钙通道阻滞剂(如硝苯地平)可能具有特殊的敏感性,这为无法手术患者的药物选择提供了精准方向[42]

(3) CTNNB1突变型(约占5%~10%):转录组以Wnt/β-catenin通路靶基因的显著富集为标志,细胞增殖信号突出。其临床关联在于,此亚型可能与较高的术后持续高血压或复发风险相关,因为其生长驱动信号(Wnt通路)在术后可能仍在残留组织中发挥作用[43]

8.2. 术前突变检测可优化临床决策

(1) 对KCNJ5突变型年轻患者,优先推荐手术以获得血压治愈机会;对CTNNB1突变型需警惕术后残留高血压,强化药物随访;对CACNA1D主导的微结节型则可能需调整手术边界[41]

(2) 突变通道的药理学特性为靶向治疗提供可能:维拉帕米及大环内酯类抗生素可特异性抑制突变GIRK4通道,为难治性患者提供非手术治疗选择[44]。临床上针对钙信号通路(如使用钙通道阻滞剂)和盐皮质激素受体拮抗剂(如螺内酯、依普利酮)的治疗依据就是直接源于对机制的认知[45]

8.3. 诊断

CYP11B2免疫组化已成为病理诊断的金标准,能精准定位功能性病灶[46]

8.4. 分子影像学

靶向CYP11B2的新型PET示踪剂已进入临床研究,有望实现APA的无创、在体可视化诊断与定位[47]

9. 小结与展望

总之,基于全转录组的分析不仅深化了我们对APA发病机制的理解,也为该疾病的分子分型、精准诊断和靶向治疗开辟了新的道路。随着技术的不断进步和研究的深入,最终一定会实现APA的精准分子诊断、分型及个体化治疗,从而改善这一常见内分泌性高血压患者的临床预后。未来研究的方向可以包括:多组学整合将转录组与基因组、甲基化组、蛋白质组数据结合,构建更全面的调控网络;空间转录组学精准解析APA肿瘤内部(如CYP11B2高表达区与低表达区)的异质性;标志物的临床转化;精准治疗靶点开发为无法手术的患者提供新的治疗选择。

NOTES

*通讯作者。

参考文献

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