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IF33.9!南京医科大学博士一作登顶一区TOP刊!“乳酸化+NNMT”破解EGFR-TKI耐药之谜

  • 2026-09-07 08:14:32
IF33.9!南京医科大学博士一作登顶一区TOP刊!“乳酸化+NNMT”破解EGFR-TKI耐药之谜

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引言

这篇发表于《Molecular Cancer》的研究论文,由南京医科大学第一附属医院博士生作为共同第一作者的研究团队完成,系统揭示了非小细胞肺癌中NNMT促进EGFR-TKI获得性耐药的新机制。文章解析了NNMT如何通过EGR1介导的转录激活上调表达,进而消耗甲基供体SAM,降低H3K9me3H3K27me3水平,表观激活EGR1和ALDH3A1;ALDH3A1则通过增加乳酸生成,经p300介导的H3K18乳酸化进一步促进NNMT表达,形成EGR1/NNMT/EGR1与NNMT/ALDH3A1/乳酸/NNMT双正反馈环路

文献解读

文章题目:NNMT通过在非小细胞肺癌中形成EGR1和乳酸介导的双正反馈环路,促进获得性的EGFR-TKI耐药性

发表期刊:Molecular Cancer

发表时间:2025年3月

影响因子:33.9/Q1

01

研究背景

EGFR-TKI耐药导致非小细胞肺癌治疗失败,表观遗传调控机制尚不明确。NNMT在耐药中的角色及其与乳酸化修饰的关联亟待揭示。

02

研究方法

利用GEO数据库筛选差异基因,构建PC9/HCC827耐药细胞系。采用siRNA/过表达调控NNMT,结合MTT、克隆形成、EdU、流式评估功能。通过ChIP、双荧光素酶报告基因、Seahorse、ELISA及异种移植模型探究机制与治疗策略。

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研究结果

01

NNMT在肺癌EGFR-TKI耐药中

的作用

在多个数据库和临床样本中,NNMTEGFR-TKI耐药细胞和组织中高表达,且高表达患者预后更差。ROC曲线提示NNMT可预测耐药风险。耐药细胞系中NNMT蛋白水平显著升高(图1)。

图1. 生物信息学分析揭示了NNMT在肺癌EGFR-TKI耐药中的作用

02

NNMT调控NSCLC细胞中EGFR-

TKI耐药性

敲低NNMT降低耐药细胞对TKIs的IC50和增殖能力,增加凋亡;过表达NNMT则增强敏感细胞耐药性。NNMT直接调控非小细胞肺癌对EGFR-TKIs的耐药表型(图2)。

图2. NNMT调控NSCLC细胞中的EGFR-TKI耐药性

03

TKI耐药性中NNMT高表达

EGR1直接结合NNMT启动子并激活其转录。敲低EGR1减少NNMT表达,过表达则相反。EGR1/NNMT形成正反馈,且NNMT部分介导EGR1促耐药效应(图3)。

图3. EGR1直接在TKI抵抗性中通过转录激活NNMT

04

EGR1和ALDH3A1表观遗传激活

RNA-seq显示NNMT敲低后EGR1和ALDH3A1表达下降。GO分析富集到代谢、增殖等通路。ALDH3A1被确认为NNMT下游关键效应分子,参与耐药调控(图4)。

图4. NNMT调控EGR1和ALDH3A1导致NSCLC对EGFR-TKIs产生抗性

NNMT敲低升高SAM/SAH比值,增加H3K9me3和H3K27me3修饰,抑制EGR1ALDH3A1启动子区染色质开放。NNMT通过消耗甲基供体,表观激活两基因(图5)。

图5. NNMT还原H3K9me3和H3K27me3导致EGR1表观遗传激活

05

乳酸介导的正反馈回路促进TKI

耐药性

ALDH3A1促进乳酸生成,乳酸通过p300介导的H3K18la修饰激活NNMT转录。耐药组织中整体乳酸化水平升高。乳酸-H3K18la-NNMT构成正反馈(图6)。

图6. ALDH3A1通过靶向NNMt介导组蛋白乳酸化促进EGFR-TKI耐药性

ALDH3A1NNMT互相正向调控。敲低ALDH3A1减少乳酸和H3K18la结合NNMT启动子,过表达则相反。NNMT/ALDH3A1/乳酸环路驱动耐药,且EGR1参与其中(图7)。

图7. NNMT通过介导组蛋白乳酰化促进TKI耐药性形成乳酸介导的正反馈回路

06

NNMT在体内调控肺癌中EGFR-

TKI耐药性

体内异种移植模型中,敲低NNMT抑制肿瘤生长,降低Ki67、NNMT、EGR1、ALDH3A1表达。NNMT抑制剂联合奥希替尼显著缩小耐药肿瘤,展示治疗潜力(图8)。

图8. NNMT在体内调节肺癌中的EGFR-TKI耐药性

文章小结

本研究揭示NNMTEGFR-TKI耐药中高表达,通过消耗SAM降低H3K9me3/H3K27me3,表观激活EGR1与ALDH3A1。ALDH3A1升高乳酸,经H3K18la促进NNMT转录,形成EGR1/NNMT与乳酸介导的双正反馈环路。靶向NNMT联合奥希替尼可有效逆转耐药。

往期回顾

· IF42.5!苏州大学博士一作登顶《Cell》!国自然热点“丙酮酰化+免疫”简直王炸!

· IF15.7!中南财经政法大学本科生一作0实验国自然拿下“豪门水刊”NC!

· IF11.2!中南大学本科生一作!多组学整合+国自然拿下一区!

· IF48.5!华东师大博士一作登顶《Nature》!国自然热点“组蛋白泛素化+异染色质”堪称王炸!

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  133. /wwwdata/wwwroot/b.460.net.cn/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  134. /wwwdata/wwwroot/b.460.net.cn/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  135. /wwwdata/wwwroot/b.460.net.cn/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
  136. /wwwdata/wwwroot/b.460.net.cn/vendor/topthink/think-template/src/Template.php ( 46.61 KB )
  137. /wwwdata/wwwroot/b.460.net.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /wwwdata/wwwroot/b.460.net.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /wwwdata/wwwroot/b.460.net.cn/runtime/temp/b39519a33326a37e6706712aa3b5c984.php ( 11.95 KB )
  140. /wwwdata/wwwroot/b.460.net.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.001031s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002891s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000732s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000632s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.002730s ]
  6. SELECT * FROM `set` [ RunTime:0.000626s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002543s ]
  8. SELECT * FROM `article` WHERE `id` = 533234 LIMIT 1 [ RunTime:0.000809s ]
  9. UPDATE `article` SET `lasttime` = 1789060310 WHERE `id` = 533234 [ RunTime:0.002275s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000333s ]
  11. SELECT * FROM `article` WHERE `id` < 533234 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000931s ]
  12. SELECT * FROM `article` WHERE `id` > 533234 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000809s ]
  13. SELECT * FROM `article` WHERE `id` < 533234 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001405s ]
  14. SELECT * FROM `article` WHERE `id` < 533234 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001365s ]
  15. SELECT * FROM `article` WHERE `id` < 533234 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001323s ]
0.066040s