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减轻癌细胞转移!武汉大学中南医院等单位合作发文:有效的防治胃癌扩散的治疗策略

  • 2026-08-31 17:06:35
减轻癌细胞转移!武汉大学中南医院等单位合作发文:有效的防治胃癌扩散的治疗策略

【免费】第二届西部单细胞与空间组学论坛

近日,武汉大学中南医院/武汉大学研究团队在期刊《ScienceAdvances》上发表了研究论文,题为“Reprogramming of valine metabolism mediated by abnormally low ALDH6A1 expression promotes invasive metastasis of gastric cancer”,本研究通过将CRISPR-Cas9代谢基因敲除筛选与患者转录组数据相结合,鉴定出线粒体酶ALDH6A1为一种抗侵袭因子。表观遗传重编程促进了小鼠胃癌肝转移。使用Alda-1药理激活ALDH6A1,或通过左旋肉碱系统性清除MMA,均可降低H3K4me2水平,抑制侵袭程序并减轻转移负担。这些发现揭示了ALDH6A1-MMA轴是胃癌转移中可靶向的代谢-表观遗传通路。

肿瘤转移级联过程中的代谢灵活性作用机制

 01 

肿瘤转移是一个高度有序的多步骤级联过程,癌细胞突破基底膜和血管结构,以循环肿瘤细胞的形式存活,并在远处微环境中形成微小的克隆灶,最终发展为肉眼可见的病灶。在整个过程中,代谢灵活性至关重要:细胞内动态的代谢重编程以及细胞外代谢物的波动,使肿瘤细胞能够通过有氧糖酵解产生三磷酸腺苷(ATP),通过过度活跃的谷氨酰胺代谢满足生物合成需求,并适应缺氧、酸中毒和营养缺乏等恶劣环境。

靶向ALDH6A1介导的缬氨酸代谢重塑可抑制胃癌在体内的肝转移

 02 

为探究低表达ALDH6A1如何导致胃癌细胞中甲基丙二酸(MMA)积累并调控H3K4me2(一种与侵袭相关的标志物),研究人员进一步在体内评估了ALDH6A1-MMA-H3K4me2轴的作用机制。研究人员建立了BALB/c-nu裸鼠脾内注射模型以诱导胃癌肝转移,并利用IVIS系统实时监测肿瘤进展。与注射野生型AGS细胞的小鼠相比,ALDH6A1过表达显著降低了肝脏荧光信号,而ALDH6A1敲除则明显增强了该信号。值得注意的是,ALDH6A1缺失组中升高的转移信号通过腹腔注射二甲基α-酮戊二酸(dm-α-KG)或L-肉碱后显著减弱。同样,外源性MMA增强了肝脏荧光信号,而联合使用dm-α-KG则在很大程度上逆转了这一效应。定量分析显示,ALDH6A1敲除和MMA处理均显著增加了肝转移灶的数量,而ALDH6A1过表达、dm-α-KG及L-肉碱的给予则明显减少了转移病灶。同时,研究人员检测了各组小鼠的血清MMA水平,发现ALDH6A1敲除导致循环MMA水平升高,而ALDH6A1过表达或L-肉碱治疗则降低了血清MMA水平。蛋白质免疫印记实验结果证实,在ALDH6A1缺失或MMA积累后,肝转移灶中的侵袭标志物及H3K4me2水平均升高,而dm-α-KG或L-肉碱处理则抑制了这些促侵袭效应。ChIP-qPCR进一步表明,在ALDH6A1-KO或MMA处理的小鼠肝转移灶中,ANGPT2和MMP7启动子区域的H3K4me2富集水平显著升高,而dm-α-KG或左旋肉碱干预可将该水平恢复至基线。

在本研究中,胃癌细胞内MMA的积累是由于ALDH6A1表达降低导致酶活性丧失所致。Alda-1作为ALDH6A1的激动剂,已被证实可增强其酶功能。为评估ALDH6A1-MMA轴是否可作为胃癌肝转移的治疗靶点,研究人员在裸鼠胃癌肝转移模型中通过腹腔注射给予Alda-1和L-肉碱。结果显示,Alda-1和L-肉碱均能有效抑制胃癌肝转移灶的形成。这些治疗效果伴随着血清MMA水平下降、侵袭相关基因ANGPT2和MMP7启动子区域H3K4me2富集程度降低,以及转移性肿瘤细胞侵袭表型的整体减弱和H3K4me2水平的下调。

靶向ALDH6A1-MMA代谢轴可减少胃癌的肝转移

这些体内实验结果共同表明,增强ALDH6A1活性或促进MMA排泄均能有效抑制胃癌肝转移,凸显了ALDH6A1-MMA代谢轴作为转移性胃癌潜在治疗靶点的重要性。

参考资料:

https://www.science.org/doi/10.1126/sciadv.aeb2892

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  1. CONNECT:[ UseTime:0.001002s ] mysql:host=127.0.0.1;port=3306;dbname=f460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001962s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000459s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000368s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001418s ]
  6. SELECT * FROM `set` [ RunTime:0.000336s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001423s ]
  8. SELECT * FROM `article` WHERE `id` = 587492 LIMIT 1 [ RunTime:0.000748s ]
  9. UPDATE `article` SET `lasttime` = 1788753205 WHERE `id` = 587492 [ RunTime:0.004855s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000781s ]
  11. SELECT * FROM `article` WHERE `id` < 587492 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000873s ]
  12. SELECT * FROM `article` WHERE `id` > 587492 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000693s ]
  13. SELECT * FROM `article` WHERE `id` < 587492 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000858s ]
  14. SELECT * FROM `article` WHERE `id` < 587492 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001992s ]
  15. SELECT * FROM `article` WHERE `id` < 587492 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000904s ]
0.066458s