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IF15.4!南京医大副校长韩峰团队“国自然”登顶《Nature》子刊:打破抗血管生成困局,重塑内皮“抑癌”新范式!

  • 2026-05-29 15:52:36
IF15.4!南京医大副校长韩峰团队“国自然”登顶《Nature》子刊:打破抗血管生成困局,重塑内皮“抑癌”新范式!

引言:

🔍胶质母细胞瘤中,肿瘤干细胞定植于血管微环境,依赖内皮细胞维持干性及治疗抵抗;传统抗血管生成疗法疗效有限且易诱发肿瘤侵袭,提示ECs兼具促癌与抑癌双重作用。解析并激活ECs内源性抑癌信号、阻断GSCs“生态位”支持,是逆转GBM耐药复发的关键。

✅ 2025年,南京医科大学韩峰教授团队《Cell Death & Differentiation》(IF=15.4)杂志上发表的研究,为我们带来了新希望。他们发现,正常状态下内皮细胞分泌的SEMA3G蛋白在GBM中显著下调,而补充这个蛋白,能通过一条精妙的信号链,诱导GSCs的核心干性因子c-Myc降解,从而釜底抽薪,抑制肿瘤生长。这为GBM治疗提供了一个全新的、靶向肿瘤微环境的策略。

文献解读

中文标题:内皮细胞来源的SEMA3G通过诱导c-Myc降解来抑制胶质母细胞瘤干细胞

发表期刊:Cell Death & Differentiation

发表时间:2025年12月

影响因子:15.4/Q1

研究背景

胶质母细胞瘤是恶性程度最高的成人脑肿瘤,难治根源在于肿瘤干细胞(GSCs)的放化疗抵抗与血管新生的双重加持。ECs不仅通过VEGF促血管生成,更构建了血管周围微环境(PVN)作为GSCs的“庇护所”,助长其干性与复发。

研究方法

模型构建与临床关联:

  • 数据打地基: 一边收病人的肿瘤组织和脑脊液,一边扒TCGA、GEO(GSE162631)这些大数据库,单细胞加生存分析,先把临床相关性做实了。

  • 体内体外全铺开: 细胞用病人来源的GSC(07/27)和GL261,动物上内皮特异性敲除鼠(Sema3G cKO)加裸鼠原位成瘤,把血管微环境的台子搭得稳稳的。

分子机制与功能验证:

  • 不光做WB、Co-IP这些常规操作,关键是用TurboID和BiFC直接拍到蛋白互作,再用CHX和泛素化搞清楚蛋白是怎么降解的。

  •  神经球形成看干性,极限稀释看成瘤能力,配合GTPase Pull-down测活性,一套组合拳下来,把“为啥耐药、为啥复发”的逻辑链彻底锁死。

研究结果

1

SEMA3G在GBM患者中低表达,且主要源于内皮细胞

直接锁定了SEMA3G这个靶点。从单细胞数据(GSE162631)一看,GBM内皮细胞里它掉得最狠,P值极显著。后续在多中心数据库和临床样本里都得到验证:不管是mRNA还是蛋白,肿瘤里都比正常脑组织和脑脊液低一大截,而且它和内皮标志物CD34/CDH5完全同步,实锤主要由内皮细胞分泌。

图1.GBM患者中SEMA3G的表达谱

复现建议:

如果你的课题也关注某种分泌蛋白在肿瘤微环境中的作用,可以借鉴这套“单细胞数据初筛 -> 多数据库验证 -> 自有样本qPCR/WB验证 -> 体液ELISA验证”的完整流程。在自己论文中,可以先用公共数据库快速锁定目标,再聚焦验证。

2

内皮来源的SEMA3G在体内抑制GBM生长

通过CellChat分析预测,SEMA3G的主要作用对象是肿瘤细胞(图2A),并通过免疫荧光和AP配体结合实验,证实SEMA3G确实能结合到GBM组织上,且依赖于其受体NRP2(图2B, C)

为了验证功能,他们构建了内皮细胞特异性敲除Sema3G的小鼠。原位接种肿瘤后,敲除鼠脑内的肿瘤长得更快、更大,老鼠死得更早(图2D-I)

图2.SEMA3G抑制颅内胶质母细胞瘤生长

复现建议:

这里非常推荐大家学他们这套“细胞特异性基因操作”的思路,做机制验证时特别管用。首选肯定是Cre-LoxP条件性敲除小鼠,直接在源头把目标细胞的功能“减”掉,干净利落;如果造小鼠周期太长,也可以用AAV局部注射或者腹腔打重组蛋白来做“加法”回补。

3

SEMA3G直接削弱GSC的干性

体外实验表明,重组SEMA3G蛋白能时间和浓度依赖性地抑制GSC的生长、神经球形成能力和自我更新能力(图3A-H)。更重要的是,他们收集了过表达SEMA3G的HUVEC细胞的条件培养基(CM) 来模拟内皮细胞的旁分泌作用。结果发现,这种CM同样能抑制GSC的干性,而这种抑制作用可以被NRP2的中和抗体所“挽救”(图3I-L)。

图3.SEMA3G抑制GSCs的生长和自我更新

复现建议:

强烈推荐使用Transwell共培养或条件培养基体系。设计实验时,务必设置“挽救”组,这能让你的机制研究从“相关性”走向“因果性”

4

SEMA3G通过泛素-蛋白酶体途径促进c-Myc降解

把SEMA3G怎么干掉c-Myc的机制摸透了。GSEA一看,SEMA3G低的病人,c-Myc通路疯涨。说明是翻译后调控。放线菌酮实验显示c-Myc的半衰期明显变短了。实验证实SEMA3G只管蛋白不管RNA,蛋白半衰期实验更是实锤:加了SEMA3G,c-Myc死得快。最后锁定是泛素化途径,SEMA3G能拉泛素化给c-Myc贴“死亡标签”,用MG-132一堵,蛋白就不降了,逻辑链完美闭环。

图4.SEMA3G在GSCs中降低c-Myc蛋白的稳定性

复现建议:

当发现一个蛋白水平变化但mRNA不变时,CHX追踪半衰期和MG-132处理是必须做的两个实验。在自己的论文里,如果发现类似现象,可以立刻沿着“泛素化”这条路往下走,去筛选E3连接酶或去泛素化酶。

5

WWP2是SEMA3G诱导c-Myc降解的关键E3泛素连接酶

抓到了真正的“刽子手”WWP2。作者先筛了6个候选E3连接酶,Co-IP一筛,只有WWP2能跟c-Myc抱团。截短体实验精准定位到了c-Myc的bHLH/LZ区域是结合位点。功能上,WWP2就是降解开关:过表达它就降,敲低它就升。最绝的是在GSC里敲掉WWP2,SEMA3G彻底失效,既降不了c-Myc,也干不掉神经球,实锤SEMA3G全靠WWP2干活。

图5.SEMA3G通过依赖WWP2的方式促进c-Myc降解

复现建议:

这里强烈推荐大家抄这套“互作筛选+功能挽救”的作业,做机制的时候特别顺手。找互作蛋白别瞎蒙,先跑个质谱或者翻翻BioGRID、STRING这些数据库,圈几个候选出来再用Co-IP去验证,命中率能高不少。

6

SEMA3G通过NRP2/PLXNA1受体复合物失活Cdc42

通过TurboID邻近标记和Co-IP,确定SEMA3G的受体复合物是NRP2/PLXNA1(图6A-C)。敲低PLXNA1同样能阻断SEMA3G对c-Myc的下调作用(图6D-H)

GO分析提示“GTPase活性负调控”。通过GST-Pull-down实验,他们发现SEMA3G特异性地抑制了Cdc42的活性,而对RhoA和Rac1影响不大(图6I-O)

图6.SEMA3G通过GSCs中的NRP2/PLXNA1失活Cdc42

复现建议:

推荐大家学这套“互作+活性”的组合拳,做信号通路机制时特别管用。想找受体复合物,普通实验室没必要死磕高门槛的TurboID,踏踏实实用Co-IP加免疫荧光共定位就是最稳的黄金搭档。

7

Cdc42充当分子开关,调控WWP2与c-Myc的结合

把这台“分子开关”拆得明明白白。用Cdc42的突变体一看:死掉的Cdc42(T17N)能让c-Myc跟着陪葬,而活蹦乱跳的Cdc42(Q61L)则把它护得死死的。机制上更精妙,平时Cdc42像个“保镖”一样把WWP2扣住,不让它碰c-Myc;一旦SEMA3G来了,Cdc42失活(GDP态)WWP2立马被释放,转身就把c-Myc拖去降解了

图7.Cdc42充当分子开关,调控WWP2介导的c-Myc降解过程

复现建议:

研究这种复杂的动态竞争机制,BiFC或FRET技术是很好的选择。在研究中,一个蛋白的非经典功能可能比其经典功能(GTPase)更重要。在自己的课题中,当发现两个蛋白功能相关但无直接催化关系时,可以大胆假设存在一个“竞争性结合”“扣押-释放”的模型。

 三

文章小结

该研究不仅加深了我们对肿瘤微环境中细胞间对话的理解,更重要的是,它从一个“抑制性”角度提供了治疗GBM的新思路——不是简单地抗血管,而是重编程血管内皮细胞,让其释放更多像SEMA3G这样的“有益”信号。

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  1. CONNECT:[ UseTime:0.001013s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001510s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005252s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001817s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001504s ]
  6. SELECT * FROM `set` [ RunTime:0.001341s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001532s ]
  8. SELECT * FROM `article` WHERE `id` = 573041 LIMIT 1 [ RunTime:0.004457s ]
  9. UPDATE `article` SET `lasttime` = 1780120540 WHERE `id` = 573041 [ RunTime:0.003222s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000769s ]
  11. SELECT * FROM `article` WHERE `id` < 573041 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001354s ]
  12. SELECT * FROM `article` WHERE `id` > 573041 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004044s ]
  13. SELECT * FROM `article` WHERE `id` < 573041 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009697s ]
  14. SELECT * FROM `article` WHERE `id` < 573041 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014472s ]
  15. SELECT * FROM `article` WHERE `id` < 573041 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005920s ]
0.266242s