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IF33.0!南京医科大学王学浩院士用'国自然',登顶双一区TOP!

  • 2026-06-01 10:42:44
IF33.0!南京医科大学王学浩院士用'国自然',登顶双一区TOP!
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引言

最近读到南京医科大王学浩院士团队发在《Journal of Hepatology》上的一项工作,挺有意思的。他们发现肝癌里一个叫eIF3f的蛋白,通过稳定ACSL4、促进脂肪酸合成,不光自己长,还能抑制CD8+T细胞,相当于给肿瘤“加油又挡枪”。不过反过来看,靶向eIF3f再联合PD-1,在小鼠模型上效果还挺好。感觉这个靶点以后有戏,说不定能帮到一部分肝癌病人。

如果你想做国自然,可以找小柒帮忙,能给你的科研之路实实在在助力一把,欢迎来试试~

literature interpretation
文献解读

标题:eIF3f通过重塑肝细胞癌中的脂肪酸生物合成促进肿瘤恶性化

发表期刊:Journal of Hepatology

发表时间:2025年9月

影响因子:33.0/Q1

研究背景

脂肪酸代谢与肝细胞癌密切相关。阐明影响HCC中脂肪酸代谢的分子对于开发精准治疗非常重要。然而,揭示肿瘤细胞中脂肪酸代谢变化的具体分子机制具有挑战性。在本研究中,我们旨在确定HCC中脂肪酸代谢的特征。

研究方法

多组学筛选:利用单细胞测序、空间转录组和代谢组学,锁定关键基因eIF3f。

多模型验证:在类器官、小鼠和斑马鱼模型中证实eIF3f促癌功能。

机制解析:通过Co-IP、泛素化和突变实验,揭示eIF3f去泛素化稳定ACSL4的分子机制。

research results
研究结果
01
筛选eIF3f

他们先养了病人的肝癌类器官,然后做单细胞测序。对比脂肪酸代谢高和低的细胞,找出差异基因。再结合公共数据库和自己中心的病人样本,层层筛选,最终锁定EIF3F——它在癌里表达显著升高,而且跟预后差强相关。这个筛选逻辑挺严谨的,一步步缩小范围(图1)

图1 将类器官的单细胞RNA测序分析与广泛的数据库分析结合,以探索同时影响肝细胞癌中FAM和恶性的基因

复现建议:首先需要建立病人来源的肝癌类器官培养体系,然后做单细胞测序和空间转录组。数据分析方面,用UMAP降维、Monocle2做拟时序分析,再结合TCGA数据库做生存分析。最好有自己的组织芯片做免疫组化验证。

02

体内外验证

在细胞和类器官里分别敲低或增加eIF3f,然后放到小鼠身上看效果。结果很清楚:敲低eIF3f后,肿瘤长得慢、转移少、小鼠活得更久;过表达则相反,肿瘤长得更疯、转移更多。斑马鱼模型也验证了这点,说明eIF3f确实在促进肝癌恶化,而且这个效果跨物种都成立(图2)

图2 升高的eIF3f水平在体内外促进肝细胞癌的恶性转化

复现建议:需要构建慢病毒介导的敲低和过表达稳转细胞系。小鼠模型要做皮下、肝脏原位和尾静脉注射,用生物发光成像和MRI监测肿瘤。斑马鱼实验需要显微注射技术。统计分析用Kaplan-Meier做生存曲线比较。

03

促进脂肪酸合成

对过表达eIF3f的细胞做了代谢组和蛋白组分析,发现脂类代谢物特别多,脂肪酸合成通路被激活了。碳13标记实验证实,eIF3f能让细胞把更多葡萄糖变成脂肪酸,包括C16:0、C18:1这些常见的。结果就是细胞里的脂滴和甘油三酯都明显变多了,电镜下看得一清二楚(图3)

图3 eIF3f促进HCC中FAB和脂质的积累

复现建议:需要做非靶向代谢组学和蛋白组学,用LC-MS/MS检测。碳13代谢流实验要用U-13C6葡萄糖培养细胞,然后提取脂肪酸用质谱检测。脂滴染色用Bodipy 493/503或尼罗红,共聚焦显微镜拍照。脂滴数量要用透射电镜确认。

04
结合ACSL4

用免疫共沉淀联合质谱找到了与eIF3f结合的蛋白,再结合蛋白组学数据锁定ACSL4。然后用Co-IP、GST pull-down、免疫荧光、PLA一系列方法反复证实它俩确实直接结合。他们还找到了结合区域和关键位点,并用点突变验证了。这套验证组合拳打得挺全面的(图4)

图4 eIF3f特异性地与FAB关键因子ACSL4相互作用

复现建议:先做免疫沉淀-质谱筛选互作蛋白。验证用Co-IP、GST pull-down、免疫荧光共定位和PLA试剂盒。构建截短体和点突变用分子克隆。结构模拟用AlphaFold2预测,Pymol做对接图。

05

去泛素化保护

发现eIF3f多了,ACSL4蛋白也多了,但不是合成增加,而是降解变慢了。具体机制是eIF3f能减少ACSL4上的K48泛素化连接——这个就是送去蛋白酶体降解的“死亡标签”。他们找到了eIF3f的关键活性位点,也确定了ACSL4上被保护的K148和K536位点,挺精细的(图5)

图5 eIF3f抑制K48链接的泛素介导的ACSL4蛋白酶体降解

复现建议:用放线菌酮追踪蛋白半衰期。用MG132和氯喹区分降解途径。泛素化检测用泛素抗体,区分K48链需转染突变体Ub质粒。去泛素化活性位点通过序列比对找保守残基,再定点突变验证。

06

磷酸化调控

拿磷酸酶处理一下,eIF3f和ACSL4的结合就变弱了,说明磷酸化很关键。筛选了一圈激酶后,发现SRPK1这个激酶能磷酸化eIF3f,促进它俩结合。关键位点是eIF3f上的Ser266。突变这个位点会破坏结合,而模拟磷酸化则恢复结合,说明磷酸化就像给eIF3f装了个“抓手”(图6)

图6 SRPK1介导的eIF3f Ser266磷酸化促进其与ACSL4的相互作用

复现建议: 用λ-磷酸酶处理后做Co-IP。Phos-tag SDS-PAGE检测磷酸化水平变化。激酶筛选用siRNA库敲低候选激酶。磷酸化位点鉴定用质谱或点突变验证。需要SRPK1的特异性抑制剂做功能验证。

Article Summary
文章小结

这项研究发现,肝癌中高表达的eIF3f蛋白通过与ACSL4结合,去除其K48泛素化降解标签,从而稳定ACSL4并促进脂肪酸合成。脂肪酸积累一方面驱动肝癌恶性进展,另一方面抑制CD8+T细胞的浸润和杀伤功能。小鼠实验表明,使用LNP-siRNA靶向抑制eIF3f,能显著增强抗PD-1免疫治疗的效果,为肝癌治疗提供了新策略。

这篇研究机制和临床价值都很能打,如果你要做国自然,缺思路或分析,小柒能帮你落地,对国自然感兴趣,就找快来找小柒吧!

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  1. CONNECT:[ UseTime:0.000475s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000618s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000274s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000560s ]
  8. SELECT * FROM `article` WHERE `id` = 565728 LIMIT 1 [ RunTime:0.015356s ]
  9. UPDATE `article` SET `lasttime` = 1780382923 WHERE `id` = 565728 [ RunTime:0.003071s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000300s ]
  11. SELECT * FROM `article` WHERE `id` < 565728 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001221s ]
  12. SELECT * FROM `article` WHERE `id` > 565728 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003091s ]
  13. SELECT * FROM `article` WHERE `id` < 565728 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002721s ]
  14. SELECT * FROM `article` WHERE `id` < 565728 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012435s ]
  15. SELECT * FROM `article` WHERE `id` < 565728 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000770s ]
0.110199s