当前位置:首页>南京>IF44.5!恭喜南京医科大学斩获《Cell》子刊!铜死亡耐药核心机制被破解,国自然新方向来了!

IF44.5!恭喜南京医科大学斩获《Cell》子刊!铜死亡耐药核心机制被破解,国自然新方向来了!

  • 2026-06-02 23:03:03
IF44.5!恭喜南京医科大学斩获《Cell》子刊!铜死亡耐药核心机制被破解,国自然新方向来了!
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引言YINYAN

🔍铜死亡作为新型细胞死亡方式,通过靶向线粒体脂酰化蛋白诱导肿瘤细胞死亡,在肿瘤治疗中极具潜力。但实体瘤缺氧微环境会显著降低癌细胞对铜死亡的敏感性,具体耐药机制尚不明确。

📈缺氧诱导因子-1α(HIF-1α)是缺氧应答核心调控因子,广泛参与肿瘤代谢重编程与治疗耐药,其在铜死亡耐药中的调控作用与分子通路亟待深入解析。

为此,本研究系统揭示HIF-1α通过双重机制驱动癌细胞对铜死亡产生耐药,并证实抑制HIF-1α可显著增强铜死亡诱导剂的抗肿瘤效果,为实体瘤联合治疗提供全新靶点与策略。

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文章标题:缺氧诱导因子-1α驱动癌细胞对铜死亡产生耐药性

发表期刊:Cancer Cell

发表时间:2025年5月

影响因子:44.5/Q1

研究背景

铜死亡是新兴的抗癌策略,但实体瘤缺氧微环境常导致耐药。HIF-1α是否及如何调控铜死亡尚不明确。本研究揭示HIF-1α通过PDK1/3下调DLAT并诱导MT2A螯合线粒体铜,从而驱动耐药,为联合治疗提供新靶点。

研究方法

本研究采用空间/单细胞转录组、CRISPR/Cas9基因编辑、蛋白质印迹、ChIP-qPCR、微尺度热泳、分子对接、ICP-MS测铜、Seahorse代谢分析及小鼠移植瘤模型,解析HIF-1α通过PDK1/3及MT2A介导铜死亡耐药机制。

研究结果
01

HIF-1α 驱动缺氧相关的铜死亡

耐药

空间转录组和单细胞测序显示,缺氧区铜死亡评分显著低于常氧区,两者呈负相关。细胞实验中,缺氧显著降低多种癌细胞对铜载体(ES+Cu)的敏感性。敲低HIF-1α可恢复铜死亡敏感性,过表达则促进耐药,而HIF-2α或KDM5A无此作用(图1)

图1.HIF-1α在缺氧肿瘤微环境中驱动铜死亡耐药

02

HIF-1α通过PDK1/3下调DLAT

表达

缺氧条件下,DLAT及脂酰化DLAT蛋白水平显著下降,且依赖HIF-1α。HIF-1α不直接转录调控DLAT,而是通过激活PDK1/3促进DLAT磷酸化和泛素化降解。敲除PDK1/3可恢复DLAT表达及铜死亡敏感性(图2)

图2.HIF-1α抑制铜靶点DLAT的表达

03

铜离子结合HIF-1α并抑制其

泛素化

ES+Cu处理抑制三羧酸循环、耗氧率和PDH活性,同时激活糖酵解并稳定HIF-1α蛋白。铜直接结合HIF-1α,抑制其与VHL结合,减少泛素化降解。敲低葡萄糖转运蛋白GLUT1可增强铜死亡(图3)

图3.铜稳定HIF-1α蛋白

04

HIF-1α促进MT2A等金属硫蛋白

积累

HIF-1α转录激活金属硫蛋白家族。缺氧和ES+Cu均上调MT2A表达,且呈氧浓度依赖性。HIF-1α直接结合MT2A启动子中的缺氧反应元件。铜与MT2A结合亲和力远高于其他金属离子(图4)

图4.HIF-1α促进缺氧下金属硫蛋白的积累

05

MT2A螯合线粒体铜引起铜死亡

抵抗

MT2A主要定位于细胞核和细胞膜,不进入线粒体。缺氧下线粒体铜水平降低,过表达MT2A减少线粒体铜并恢复细胞活力,敲除MT2A则增加线粒体铜和铜死亡敏感性。HIF-1α直接转录调控MT2A,两者在肿瘤组织中表达正相关(图5)

图5.MT2A螯合线粒体铜并导致铜死亡耐药

06

MT2A支持癌细胞在铜应激下长期

增殖

高MT2A表达与泛癌种较差总生存和无病生存相关。敲除MT2A不影响短期活力但显著抑制长期克隆形成能力,同时线粒体铜累积。铜螯合剂TTM或敲低铜转运蛋白SLC31A1可挽救克隆形成缺陷。体内实验中MT2A敲除抑制肿瘤生长,TTM可逆转(图6)

图6.MT2A促进癌细胞在铜应激下的长期增殖

07

HIF-1α抑制剂增敏铜死亡并协同

抑瘤

ES+Cu联合治疗抑制小鼠移植瘤生长,但高剂量铜导致肝损伤。联合HIF-1α抑制剂PX-478与低剂量ES+Cu可显著抑制肿瘤生长,效果等同于高剂量铜且无肝毒性。在AOM/DSS诱导的结直肠癌模型中同样有效。AAV介导的HIF-1α敲低也增强疗效(图7)

图7.HIF-1α抑制剂增敏肿瘤细胞对铜死亡的反应

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文章小结

本研究通过细胞与动物实验证实,缺氧微环境中HIF‑1α通过激活PDK1/3下调DLAT、上调MT2A螯合线粒体铜,驱动癌细胞对铜死亡耐药。铜可稳定HIF‑1α形成正反馈,抑制HIF‑1α能显著增敏铜死亡疗法,为肿瘤治疗提供新策略。

END
往期推荐:

IF52.7!国自然上大分!天津医科大学校长荣登国产神刊《STTT》!胰腺癌治疗破局:锁定GPR34通路!

IF21.7!中南湘雅医院副校长“国自然”八图斩获一区顶刊!破解癌细胞遗传毒性药耐药密码!

IF45.8!国自然上大分!仅六图斩获《Science》!

IF42.5!“国自然”助力中南大学湘雅医院团队荣登《Cell》!精准破解皮肤-下丘脑轴的代谢调控机制!

IF52.7!国自然上大分!大连医科大学团队荣登国产神刊《STTT》!

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  1. CONNECT:[ UseTime:0.000531s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000907s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000340s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000671s ]
  6. SELECT * FROM `set` [ RunTime:0.000247s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000756s ]
  8. SELECT * FROM `article` WHERE `id` = 560355 LIMIT 1 [ RunTime:0.007192s ]
  9. UPDATE `article` SET `lasttime` = 1780809827 WHERE `id` = 560355 [ RunTime:0.003847s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000282s ]
  11. SELECT * FROM `article` WHERE `id` < 560355 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000477s ]
  12. SELECT * FROM `article` WHERE `id` > 560355 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000954s ]
  13. SELECT * FROM `article` WHERE `id` < 560355 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014477s ]
  14. SELECT * FROM `article` WHERE `id` < 560355 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014262s ]
  15. SELECT * FROM `article` WHERE `id` < 560355 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008502s ]
0.141376s