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Cell子刊 | 南昌大学喻本桐/王建斌发现肺腺癌抵抗铜死亡新机制

  • 2026-06-11 19:37:59
Cell子刊 | 南昌大学喻本桐/王建斌发现肺腺癌抵抗铜死亡新机制

iNature

铜死亡(Cuproptosis)是由铜过载触发、依赖铜离子的新型细胞死亡方式,已成为肿瘤领域新兴的治疗研发方向,但调控该过程的肿瘤特异性分子通路尚不明确。

2026年6月1日,南昌大学喻本桐、王建斌共同通讯Cell Reports(IF=8.1)线发表“SIRT5-mediated FDX1 desuccinylation confers cuproptosis resistance in lung adenocarcinoma的研究论文本研究证实肺腺癌(LUAD)组织铜离子含量异常升高,且LUAD细胞株普遍对铜死亡产生耐受。机制层面:铜应激上调去琥珀酰化酶SIRT5表达,使LUAD细胞整体蛋白琥珀酰化修饰水平下降。
研究进一步证实,SIRT5可靶向铁氧还蛋白1(FDX1)第84位赖氨酸(Lys84)位点并对其去琥珀酰化修饰,是调控铜死亡的关键中介分子;该修饰可启动TRIM8介导的泛素化反应,促使FDX1经蛋白酶体途径降解,最终造成细胞铜死亡抗性上升。以上结果阐明SIRT5在LUAD铜死亡抵抗中发挥关键作用。值得关注的是,SIRT5抑制剂MC3482联用铜死亡诱导剂Elesclomol-Cu可在体内协同抑制肿瘤生长,具备良好的临床转化潜力。本研究解析了肿瘤铜死亡耐药的分子机制,为LUAD提供了全新的治疗思路。

铜元素在促进细胞代谢、维持机体基础生命活动中不可或缺,同时还深度参与肿瘤发生、血管生成、肿瘤复发与远处转移进程。但胞内铜离子浓度超过临界阈值时,会诱发一种特殊的细胞死亡形式-铜死亡。铜离子过量蓄积通过引发线粒体蛋白毒性应激启动铜死亡,最终造成细胞凋亡。相较于正常细胞,肿瘤细胞可耐受更高浓度铜离子,借此促进自身增殖并拮抗铜死亡。已有多项研究证实,诱导肿瘤细胞发生铜死亡是极具潜力的抗肿瘤治疗方向,但肺腺癌(LUAD)中铜死亡的启动、级联放大及抑制调控机制尚不明确。
铁氧还蛋白1(FDX1)是铜死亡发生的必需分子:该蛋白可促使脂酰化蛋白二氢硫辛酰胺S-乙酰转移酶(DLAT)、二氢硫辛酰胺S-琥珀酰转移酶(DLST)异常聚集,造成铁硫簇(Fe-S)蛋白耗竭,同时将二价铜(Cu²⁺)还原为毒性更强的一价铜(Cu⁺),最终介导细胞死亡。FDX1蛋白下调、脂酰化蛋白丢失是肿瘤细胞铜死亡的特征性标志物,但FDX1降解属于铜死亡的结果而非诱因;反之,FDX1低表达会使细胞产生铜死亡耐药。此外,FDX1是铜死亡诱导剂Elesclomol的关键作用靶点,多种肿瘤中FDX1表达下调是肿瘤耐受铜死亡的重要原因,但肿瘤内FDX1低表达的上游调控机制仍未阐明。
琥珀酰化修饰是线粒体中丰度极高的蛋白质翻译后修饰(PTMs),在肿瘤进展中发挥关键作用,可调控多种线粒体蛋白功能。琥珀酰化能够改变底物蛋白的空间构象与电荷属性,进而调控多条核心代谢通路。沉默信息调节因子5(SIRT5)是定位于线粒体的核心去琥珀酰化酶,与肿瘤发生发展密切相关,在不同癌种中兼具促癌或抑癌的双重作用。既往研究表明SIRT5参与调控糖酵解、谷氨酰胺代谢、脂肪酸氧化及磷酸戊糖通路,但SIRT5能否调控铜死亡相关蛋白的琥珀酰化修饰、进而影响铜死亡进程尚无报道。

图形摘要(图源自Cell Reports 

本研究发现LUAD组织铜含量显著升高,LUAD细胞通过降低FDX1蛋白稳定性获得更强的铜死亡抗性;高铜环境可上调SIRT5表达,整体下调细胞蛋白琥珀酰化水平。机制研究证实,SIRT5结合FDX1并对其第84位赖氨酸(Lys84)位点去琥珀酰化修饰,进而抑制铜死亡;该修饰可启动TRIM8介导的泛素化通路,促使FDX1经由蛋白酶体途径降解。治疗层面,采用SIRT5小分子抑制剂MC3482联合铜死亡诱导剂Elesclomol-Cu具有强效协同效应,可显著抑制LUAD细胞增殖,并在异种移植瘤小鼠、KrasLSL-G12D/+;Trp53fl/fl(KP)基因编辑肺癌小鼠模型中有效遏制肿瘤生长。上述结果揭示了LUAD铜死亡耐药的分子机制,为肺腺癌提供了极具前景的联合治疗新方案。
参考消息:
10.1016/j.celrep.2026.117481

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  1. CONNECT:[ UseTime:0.000617s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000849s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000363s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000296s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000632s ]
  6. SELECT * FROM `set` [ RunTime:0.000255s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000586s ]
  8. SELECT * FROM `article` WHERE `id` = 526120 LIMIT 1 [ RunTime:0.000453s ]
  9. UPDATE `article` SET `lasttime` = 1782131323 WHERE `id` = 526120 [ RunTime:0.016265s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000291s ]
  11. SELECT * FROM `article` WHERE `id` < 526120 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000747s ]
  12. SELECT * FROM `article` WHERE `id` > 526120 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000450s ]
  13. SELECT * FROM `article` WHERE `id` < 526120 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001120s ]
  14. SELECT * FROM `article` WHERE `id` < 526120 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001071s ]
  15. SELECT * FROM `article` WHERE `id` < 526120 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007068s ]
0.100329s