当前位置:首页>南京>Gut重磅|南京医科大学王学浩院士团队证实乳酸修饰酶 AARS2 驱动HCC恶性进程与免疫微环境

Gut重磅|南京医科大学王学浩院士团队证实乳酸修饰酶 AARS2 驱动HCC恶性进程与免疫微环境

  • 2026-05-29 11:00:51
Gut重磅|南京医科大学王学浩院士团队证实乳酸修饰酶 AARS2 驱动HCC恶性进程与免疫微环境

肝细胞癌(HCC)是全球最常见的癌症之一,具有高死亡率、早期诊断困难、易复发转移和耐药性强等特点。代谢重编程(尤其是糖酵解增强导致的乳酸积累)是HCC的重要特征。近年来,乳酸不仅仅是代谢废物,还被发现可通过乳酸化修饰(lactylation)调控蛋白功能,影响肿瘤进展和免疫逃逸。然而,乳酸代谢、乳酸化修饰与HCC恶性进展之间的系统调控机制尚不明确。

2026年5月11日,南京医科大学戴晶晶/李清/王学浩教授团队合作在《Gut》(IF:26.2)发表文章“ Landscape screening identifies the lactate-modifying enzyme AARS2 as a master regulator and therapeutic target in hepatocellular carcinoma”。该研究依托乳酸化蛋白质组、空间转录组与单细胞测序等多组学技术,筛选发现乳酸修饰酶AARS2是肝细胞癌恶性进展的关键调控因子,进一步阐明AARS2通过乳酸化转录因子AP‑2γ并启动E3泛素连接酶TRIM28介导的K63泛素化和核转位,驱动HCC恶性进展的新机制;同时开发了首个靶向该通路的抑制剂Kukoamine A,并利用ZIF‑8纳米递送系统实现肝靶向和免疫联合治疗,为HCC精准治疗提供了新策略。

Research Highlights

研究亮点

  1. 首次系统筛选出乳酸修饰酶AARS2,并证明其在HCC中作为主调控因子。

  2. 揭示AARS2-AP-2γ-TRIM28轴:AARS2通过乳酸化修饰AP-2γ,促进其核转位和肿瘤恶性行为。

  3. 开发首个靶向AARS2-AP-2γ相互作用的小分子抑制剂——Kukoamine A。

  4. 构建ZIF-8纳米递送系统,实现肝靶向、pH响应释放,并与PD-1阻断剂协同增强免疫治疗。

Research Result

研究结果

01

乳酸代谢与肿瘤恶性程度正相关,乳酸修饰酶AARS2是HCC恶性进展的关键

本研究首先通过单细胞RNA测序(scRNA-seq)和空间转录组学,对肝细胞癌(HCC)样本进行代谢景观筛选。根据乳酸代谢(LAM)评分将肿瘤细胞分为高、中、低三组,发现高LAM区域肿瘤恶性程度更高,且乳酸代谢与蛋白乳酸化修饰呈正相关。差异基因分析及临床组织微阵列验证表明,乳酸修饰酶AARS2在高LAM区域显著高表达,其蛋白水平与增殖标志物Ki67呈正相关,且在HCC组织中明显高于癌旁组织,提示AARS2是连接乳酸代谢与HCC恶性进展的关键候选基因。功能实验证实AARS2敲降抑制肿瘤生长和肺转移,而过表达则促进恶性行为。

02

乳酸化修饰组学筛选AARS2靶点AP-2γ,乳酸化修饰促进其核转位

为阐明机制,该研究采用免疫共沉淀‑质谱(IP-MS)联合乳酸化蛋白组学,交集筛选出AP‑2γ作为AARS2的下游靶点。通过截短突变体和AlphaFold3分子对接证实AARS2的658‑985氨基酸区域与AP‑2γ的1‑127区域直接相互作用。进一步发现AARS2催化AP‑2γ第444位赖氨酸(K444)发生乳酸化修饰。

03

E3泛素连接酶 TRIM28介导的K63泛素化促进AP-2γ核转位

进一步发现,乳酸化修饰并不改变AP‑2γ总蛋白水平,而是通过增强其与E3泛素连接酶TRIM28的结合,促进AP‑2γ的K63连接泛素化(主要位点为K202和K284)。免疫荧光和核质分离实验显示,K444R突变或AARS2酶活性缺失均阻断AP‑2γ的核转位,证明乳酸化→泛素化→核转位的级联反应是AARS2促癌的核心分子机制。

04

Kukoamine A阻断AARS2-AP-2γ相互作用

基于上述机制,研究者开展了靶向AARS2‑AP‑2γ相互作用的小分子抑制剂筛选。通过虚拟筛选160万个小分子化合物库,结合高通量化合物筛选及表面等离子体共振(SPR)分析,鉴定出Kukoamine A(KD=35.1 μM)为首个可选择性阻断AARS2与AP‑2γ结合的抑制剂。GST pull‑down和共免疫沉淀证实Kukoamine A与AARS2直接结合,且定点突变AARS2关键残基后结合减弱。该抑制剂呈剂量依赖性破坏AARS2‑AP‑2γ相互作用,降低AP‑2γ的乳酸化、K63泛素化及核转位,并在小鼠皮下移植瘤模型中显示出良好的安全性和肿瘤抑制作用。

05

ZIF-8纳米递送系统增强肝靶向与免疫联合治疗

为改善Kukoamine A水溶性差、肝脏靶向性不足的问题,研究采用ZIF‑8 纳米载体对药物进行包裹,并联合肿瘤细胞膜与叶酸进行表面修饰,成功制备 ZIF‑8@KukA‑MEM‑FA 纳米药物。最后通过小鼠原位肝癌模型开展联合治疗实验,结果显示Kukoamine A纳米药物单药即可显著抑制肿瘤生长并延长生存期,与 PD‑1 抑制剂联合使用时呈现协同抗肿瘤效果,可明显增强免疫治疗疗效,有效逆转肝癌对免疫检查点抑制剂的耐药。

Research Conclusions and Significance

研究结论与意义

本研究证实AARS2是肝细胞癌中连接乳酸代谢、蛋白质乳酸化修饰与肿瘤恶性进展的核心主调控因子,它通过催化下游转录因子 AP-2γ 的 K444 位点乳酸化,增强 AP-2γ 与 E3 泛素连接酶 TRIM28 的结合并促进其 K63 位泛素化与核转位,进而驱动肝癌细胞增殖、侵袭转移并塑造免疫抑制微环境;同时筛选获得靶向 AARS2-AP-2γ 相互作用的特异性小分子抑制剂枸杞酰胺 A,经 ZIF-8 纳米载体递送后可实现高效肝脏靶向与 pH 响应释药,单独使用即可显著抑制肿瘤生长,与 PD-1 免疫治疗联用还能产生协同增效作用。

该研究不仅揭示了乳酸代谢调控肝癌恶性进展的全新分子机制,也为肝癌提供了极具转化价值的预后标志物、精准治疗靶点与联合免疫治疗新策略。

供稿:隋馨莹

编辑:市场部

QLBio

青莲百奥修饰组学解决方案

青莲百奥修饰蛋白组学产品线升级,不仅精心打磨了经典修饰产品线(如磷酸化、糖基化、泛素化等),同时开拓了一系列新型修饰产品线(如乳酸化、棕榈酰化、琥珀酰化、氧化还原等)。现凭借先进的高分辨率、高灵敏度质谱技术,积累了丰富的修饰组学研究经验,提供深入的生物信息学分析报告,为科研工作的深入探索和成果的有效转化提供强有力的支持。

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  1. CONNECT:[ UseTime:0.001042s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001254s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000618s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000556s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001053s ]
  6. SELECT * FROM `set` [ RunTime:0.005337s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001332s ]
  8. SELECT * FROM `article` WHERE `id` = 566591 LIMIT 1 [ RunTime:0.017640s ]
  9. UPDATE `article` SET `lasttime` = 1780349525 WHERE `id` = 566591 [ RunTime:0.002807s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002947s ]
  11. SELECT * FROM `article` WHERE `id` < 566591 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001023s ]
  12. SELECT * FROM `article` WHERE `id` > 566591 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015629s ]
  13. SELECT * FROM `article` WHERE `id` < 566591 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.038154s ]
  14. SELECT * FROM `article` WHERE `id` < 566591 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.025308s ]
  15. SELECT * FROM `article` WHERE `id` < 566591 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009338s ]
0.297882s