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STTT重磅综述!南京医科大院士团队总结国自然热点机制——乳酸代谢与乳酸化修饰在癌症中的进展

  • 2026-07-09 00:12:42
STTT重磅综述!南京医科大院士团队总结国自然热点机制——乳酸代谢与乳酸化修饰在癌症中的进展
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2026年5月21日,南京医科大学第一附属医院王学浩院士团队在国际权威期刊《Signal Transduction and Targeted Therapy》(IF=52.7)上发表重磅综述,系统梳理了乳酸代谢与乳酸化修饰在肿瘤发生、转移、免疫逃逸及耐药中的核心作用,挑战了乳酸作为“代谢废物”的传统认知,提出了乳酸积累是肿瘤主动适应性策略的新假说,并为靶向乳酸代谢和乳酸化的精准治疗提供了理论框架。

乳酸穿梭——从器官间协同到细胞内代谢的精密运输

乳酸穿梭是机体维持代谢稳态的核心机制。器官间穿梭表现为科里循环:运动时肌肉产生乳酸,经血液运输至肝脏,经糖异生重新合成葡萄糖,再返回肌肉利用。细胞间穿梭由单羧酸转运蛋白介导:MCT4主要外排乳酸,MCT1主要摄取乳酸,肿瘤细胞与癌相关成纤维细胞通过这一机制形成代谢共生。细胞内穿梭则是一个假想模型:线粒体内膜上的MCT与细胞色素C氧化酶及CD147偶联,线粒体LDH位于内膜外侧,共同构成乳酸氧化复合体,使乳酸能够直接进入三羧酸循环供能。

乳酸化的双向合成与可逆调控

乳酸化分为L-乳酸化和D-乳酸化,前者由LDH催化丙酮酸生成,后者通过甲基乙二醛通路产生。L-乳酸化通过两条途径实现酶依赖途径中,ACSS2或GTPSCS将L-乳酸转化为乳酰辅酶A,再由p300/CBP、GCN5、KAT8、HBO0等酰基转移酶转移至赖氨酸残基;非酶途径中,AARS1/2直接以ATP依赖方式将乳酸转移至底物。D-乳酸化则通过GLO2产生的SLG中间体介导。擦除方面,HDAC1-3和SIRT1-3被证实具有去乳酸化活性。阅读器方面,BRG1和DPF2首次被鉴定为组蛋白乳酸化的识别蛋白,能够结合特定乳酸化位点并调控染色质状态与基因转录。

肿瘤微环境中的乳酸驱动网络

肿瘤细胞通过“反向瓦博格效应”诱导成纤维细胞转化为癌相关成纤维细胞,后者增强糖酵解并分泌乳酸,为肿瘤细胞提供能量和生物合成原料。乳酸同时驱动肿瘤相关巨噬细胞极化为M2型,分泌TGF-β和VEGF,促进免疫抑制和血管生成。在免疫细胞层面,乳酸抑制树突状细胞的抗原提呈能力,减少CD80和MHC II表达;诱导CD4+ T细胞向Treg转化,并通过MOESIN乳酸化增强TGF-β信号;加速CD8+ T细胞耗竭,上调PD-1和CTLA-4。在血管系统,乳酸通过MCT1进入内皮细胞,激活NF-κB/IL-8通路,促进异常血管生成,同时诱导血管拟态形成,为肿瘤提供非内皮依赖的供血途径。

乳酸驱动肿瘤转移的全过程

在肿瘤起始阶段,乳酸通过酸性微环境诱导DNA损伤,增加C→T突变频率,并通过p53乳酸化削弱其抑癌功能。增殖阶段,乳酸酸化微环境选择更具侵袭性的克隆,并维持肿瘤干细胞干性。局部侵袭时,乳酸通过Snail1乳酸化和TGF-β/p38 MAPK通路促进上皮-间充质转化,同时激活基质金属蛋白酶降解基底膜。循环阶段,乳酸上调CD44和整合素,促进循环肿瘤细胞团簇形成,并与血小板黏附以抵抗剪切应力和NK细胞杀伤。外渗时,MCT4/CD147与MMP14共定位于侵袭伪足,通过F- actin运输到细胞膜,降解细胞外基质。定植阶段,乳酸通过外泌体构建预转移微环境,诱导靶器官酸化、免疫抑制和基质重塑,为肿瘤细胞提供适宜的“土壤”。

乳酸调控的多条致癌信号通路

乳酸不仅作为代谢物,更作为信号分子直接激活多条经典通路。GPR81和GPR132是乳酸的G蛋白偶联受体,激活后抑制cAMP产生或调节免疫细胞极化。乳酸通过PI3K/AKT/HIF-1α通路增强糖酵解和乳酸产生,形成正反馈。在Hippo通路中,AARS1介导YAP和TEAD1的乳酸化,促进下游靶基因转录。乳酸通过MAPK通路(ERK、JNK、p38)调节应激反应和增殖。Wnt/β-catenin通路中,β-catenin乳酸化促进肿瘤干细胞特性。JAK-STAT通路中,乳酸通过METTL3介导的m6A修饰激活STAT3。NF-κB通路中,乳酸通过H3K18乳酸化增强p65活性,上调TNFR2促进Treg免疫抑制。TGF-β通路中,乳酸增强MOESIN与TGF-β受体的结合,促进FOXP3转录。此外,Notch和Hedgehog通路也参与乳酸介导的代谢重编程和纤维化。

靶向乳酸代谢与乳酸化的临床策略

针对乳酸产生,LDHA抑制剂(如GSK2837808A、GNE-140)、PKM2抑制剂和己糖激酶抑制剂(2-DG、氯尼达明)可减少乳酸生成,但单药疗效有限,更适合联合治疗。针对乳酸转运,MCT1抑制剂AZD3965已进入临床试验,MCT4抑制剂VB124在肝细胞癌中显示强效抗肿瘤活性,syrosingopine作为已获批药物在多发性骨髓瘤中有效。针对乳酸化修饰,p300/CBP抑制剂inobrodib可降低乳酸化水平;针对特定乳酸化位点的精准干预,如靶向RIG-I K852乳酸化的小分子和靶向MRE11 K673乳酸化的多肽K673-pe,在动物模型中显示出良好安全性和疗效;针对APOC2 K70乳酸化的特异性抗体可增强PD-1抗体疗效。在联合治疗方面,乳酸靶向策略与免疫检查点抑制剂、靶向治疗、放化疗的联合应用正在积极探索中,有望克服传统治疗的耐药问题。

总结与展望
乳酸和乳酸化修饰正在彻底改变我们对肿瘤代谢和表观遗传调控的认知。未来研究应聚焦于开发更具特异性的靶向药物,基于乳酸化谱筛选生物标志物以实现肿瘤分型和个体化治疗,整合多组学数据揭示乳酸调控网络的时空异质性,并建立单细胞水平的空间代谢图谱。乳酸-乳酸化轴有望成为连接基础科学与临床治疗的关键桥梁,推动癌症治疗进入精准动态调控的新时代。

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  1. CONNECT:[ UseTime:0.000581s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000811s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000335s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000324s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000497s ]
  6. SELECT * FROM `set` [ RunTime:0.000220s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000616s ]
  8. SELECT * FROM `article` WHERE `id` = 578282 LIMIT 1 [ RunTime:0.015936s ]
  9. UPDATE `article` SET `lasttime` = 1783745061 WHERE `id` = 578282 [ RunTime:0.021049s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001003s ]
  11. SELECT * FROM `article` WHERE `id` < 578282 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000694s ]
  12. SELECT * FROM `article` WHERE `id` > 578282 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000484s ]
  13. SELECT * FROM `article` WHERE `id` < 578282 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001623s ]
  14. SELECT * FROM `article` WHERE `id` < 578282 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002175s ]
  15. SELECT * FROM `article` WHERE `id` < 578282 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001664s ]
0.120446s