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IF19.5!恭喜南京医科大学副教授在《Nature》子刊上连发两篇!

  • 2026-05-06 15:33:51
IF19.5!恭喜南京医科大学副教授在《Nature》子刊上连发两篇!

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引言

这篇发表于《Nature Cell Biology》的研究,由南京医科大学张茜副教授联合其他团队完成,首次打通了“TAMs→乳酸→GSCs→KU70乳酸化→DNA修复→cGAS-STING免疫逃逸”的完整代谢-免疫调控通路。研究发现TAMs通过MCT4分泌乳酸,GSCs通过MCT1摄取,由P300催化KU70 K317乳酸化,增强NHEJ修复并抑制cGAS-STING通路,减少I型干扰素,最终削弱CD8+T细胞抗肿瘤免疫。

南京医科大学国家卫健委抗体技术重点实验室副教授,江苏省发育生物学学会青年委员会委员,主要从事肿瘤干细胞微环境的免疫与代谢调控机制、肿瘤免疫治疗靶向干预策略,在胶质瘤的基础与转化应用领域取得了具有创新性与影响力的研究成果。

文献解读

文章题目:抑制巨噬细胞来源的乳酸转运可恢复cGAS–sting信号通路并增强胶质母细胞瘤的抗肿瘤免疫功能

发表期刊:Nature Cell Biology

发表时间:2026年1月

影响因子:19.5/Q1

01

研究背景

胶质母细胞瘤是一种恶性程度极高的脑肿瘤,其肿瘤微环境由GBM干细胞主导,并富含肿瘤相关巨噬细胞,且存在异常代谢通路。乳酸作为糖酵解的关键代谢产物,已知可促进肿瘤进展,但其在GBM微环境中的转运机制及乳酸化修饰的具体作用尚不明确。

02

研究方法

细胞与分子实验
  • 利用患者来源的GSCs与TAMs,通过shRNA敲除+rescue实验,验证乳酸转运及KU70乳酸化的功能。

  • 采用IP、质谱、体外修饰实验,鉴定KU70 K317 位点乳酸化及其调控酶。

  • 通过报告基因、彗星实验、γ-H2AX荧光染色,评估DNA修复效率。

动物模型
  • 构建髓系特异性MCT4敲除小鼠,验证TAM来源乳酸的作用。

  • 建立颅内移植模型,评估肿瘤生长、生存期及免疫细胞浸润。

临床样本分析
  • 利用TCGA数据库分析MCT1/MCT4表达与GBM患者预后的关系。

  • 免疫组化检测患者样本中KU70 K317lac水平,并关联生存期。

研究结果

01

TAM-GSC乳酸转运轴的鉴定

单细胞测序分析:TAMs高表达MCT4,GSCs高表达MCT1,且两者在GBM组织中空间共定位。[图1a-d]

功能验证:TAM敲除MCT4后,上清液乳酸水平下降70%,GSC摄取乳酸减少;GSC敲除MCT1后,13C标记乳酸摄取量降低约55%,证实MCT4-MCT1依赖的乳酸转运。[图1g-k]

物模型:髓系特异性敲除MCT4的小鼠,肿瘤体积缩小,生存期延长,肿瘤细胞内乳酸水平降低40%[图1m-p]

图1. GSCs与TAMs中的乳酸代谢及转运蛋白特性

GSC增殖实验:外源性乳酸以剂量依赖方式促进GSC增殖,TAM上清液可刺激GSC神经球形成,而MCT4敲除TAM的上清液则抑制该效应,外源性乳酸可挽救[图2a-c]

MCT1功能验证:GSC敲除MCT1后,乳酸诱导的增殖和神经球形成被阻断,回补MCT1可恢复[图2f-i]

体内实验:GSC敲除MCT1的小鼠模型中,肿瘤生长减缓,生存期延长。[图2j-k]

图2. 通过MCT1–MCT4在胶质瘤干细胞与肿瘤相关巨噬细胞之间转运乳酸可促进GSCs增殖

核心发现:TAMs通过MCT4分泌乳酸,GSCs通过MCT1摄取乳酸,形成代谢耦联。

02

KU70 K317乳酸化调控GSC干性与DNA修复

乳酸化水平检测:GSC的泛乳酸化水平显著高于NSC,TAM上清液刺激可提升GSC乳酸化,而MCT1敲除或MCT4敲除则降低乳酸化[图3a-c]

KU70 K317乳酸化鉴定:质谱显示KU70是GSC中差异乳酸化最显著的蛋白之一,K317位点乳酸化在GSC中高表达,而总KU70水平无差异。[图3d-h]

功能实验:KU70敲除抑制GSC增殖,回补WT KU70可恢复,而回补K317R突变体则无法完全恢复,且K317R组小鼠生存期延长、肿瘤体积缩小。[图3j-m]

图3. TAM来源的乳酸诱导了DNA损伤修复蛋白KU70 K317的乳酰化,从而导致胶质瘤干细胞增殖

NHEJ修复效率:MCT1敲除或KU70 K317R突变显著降低NHEJ活性,增加γ-H2AX水平[图4a,d]

干性维持:MCT1敲除或KU70 K317R突变导致GSC干性标志物表达下降,NHEJ抑制剂NU7441可模拟该效应[图4g-h]

分子机制:KU70的Ku核心区是与KU80结合的关键区域,K317R突变削弱KU70-KU80-DNA-PKcs复合物形成 [图4j-k]

图4. KU70K317位点的乳酰化修饰可增强NHEJ功能并维持GSC的干性

核心发现:TAM来源乳酸诱导KU70 K317乳酸化,增强NHEJ修复并维持GSC干性。

03

KU70 K317乳酸化抑制

cGAS-STING通路与免疫抑制

通路富集分析:MCT1敲除、KU70敲除或K317R突变均富集IFN-α/β应答通路,提示cGAS-STING激活。[图5a-c]

胞质dsDNA与cGAS激活:MCT1敲除或KU70 K317R突变导致GSC胞质dsDNA积累,cGAS与dsDNA共定位增加。[图5e-f]

信号通路验证:MCT1敲除或KU70 K317R突变激活cGAS-STING-TBK1-IRF3通路,增加IFN-α/β分泌,而回补WT KU70可抑制该通路 。[图5g-h]

免疫细胞浸润:TCGA数据库分析显示MCT1高表达与CD8⁺T细胞signatures负相关,提示免疫抑制。[图5k-l]

图5. KU70K317位点的乳酰化可抑制cGAS–sting信号通路,并维持免疫抑制TME 

用hM3Dq激活IBS小鼠vDG颗粒细胞后,旷场中心时间增加、悬尾和强迫游泳不动时间减少(图6A-F)vDG神经元活性是缓解情绪症状的“充分条件”——不需要吲哚,直接激活vDG就能起效。

抑制vDG→吲哚白白浪费:用hM4Di抑制vDG颗粒细胞后,吲哚的抗焦虑和抗抑郁效果全部消失(图6G-L)vDG神经元活性同时也是吲哚起效的“必要条件”——没有vDG参与,吲哚再多也没用。 一正一反,闭环完美。

图6. 乳酸转运体抑制剂联合PD-1抗体在GBM中的治疗效果

核心发现:KU70 K317lac通过减少胞质dsDNA积累,抑制cGAS-STING通路,导致免疫抑制。

04

联合治疗策略的验证

MCT抑制剂单药疗效:TAM敲除MCT4或GSC敲除MCT1均显著抑制肿瘤生长,延长小鼠生存期。[图6a-e]

联合治疗:MCT抑制剂联合抗PD-1抗体较单药更显著缩小肿瘤体积,延长生存期,CD8⁺T细胞浸润和颗粒酶B分泌增加,TAMs减少 [图6f-h]

KU70 K317靶向治疗:KU70 K317-Peptide联合抗PD-1抗体可抑制肿瘤生长,延长生存期。[图6o-p]

临床相关性:GBM患者样本中KU70 K317lac高表达与生存期缩短显著相关(中位生存期:11.43vs.19.70个月,P=0.0236)[图6k-l]

图6. 乳酸转运体抑制剂联合PD-1抗体在GBM中的治疗效果

核心发现:靶向乳酸转运或KU70乳酸化联合抗PD-1抗体可增强抗肿瘤效果。

文章小结

本研究揭示了TAM通过MCT4-MCT1轴向GSCs转运乳酸,诱导KU70 K317乳酸化,进而增强NHEJ修复、维持GSC干性、抑制cGAS-STING通路,最终形成免疫抑制微环境的机制。靶向乳酸转运或KU70 K317乳酸化联合免疫检查点阻断为GBM治疗提供了新策略,具有重要临床转化价值。

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  1. CONNECT:[ UseTime:0.000769s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000829s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000299s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000245s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000575s ]
  8. SELECT * FROM `article` WHERE `id` = 554179 LIMIT 1 [ RunTime:0.000478s ]
  9. UPDATE `article` SET `lasttime` = 1778114505 WHERE `id` = 554179 [ RunTime:0.000683s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 554179 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000507s ]
  12. SELECT * FROM `article` WHERE `id` > 554179 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000426s ]
  13. SELECT * FROM `article` WHERE `id` < 554179 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005179s ]
  14. SELECT * FROM `article` WHERE `id` < 554179 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002364s ]
  15. SELECT * FROM `article` WHERE `id` < 554179 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000936s ]
0.088412s