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IF10.6!南昌大学“AI模拟敲除”攻克肾癌免疫逃逸,成果拿下一区TOP刊!

  • 2026-05-11 16:45:21
IF10.6!南昌大学“AI模拟敲除”攻克肾癌免疫逃逸,成果拿下一区TOP刊!

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引言

为什么肾癌里明明有很多CD8+ T细胞,患者预后依然很差?🤔

南昌大学傅斌教授携团队在肿瘤免疫学顶刊《Journal for ImmunoTherapy of Cancer》发表突破性研究。

团队用Geneformer模拟敲除锁定TRIM28。机制:TRIM28通过SUMO化稳定PARP1,消耗NAD+上调PD-L1,同时与T细胞竞争NAD+,形成双重免疫抑制。老药Eltrombopag抑制TRIM28,联合抗PD-1在PDX模型中显著增效。

🎯#JITC #肾癌 #老药新用

01

文献解读

标题:在透明细胞肾细胞癌中,TRIM28通过PARP1 SUMOylation和NAD+缺失驱动免疫逃避

发表期刊:Journal For Immunotherapy of Cancer

发表时间:2025年10月23日

影响因子:10.6/Q1

1

研究背景 | Background

透明细胞肾细胞癌(ccRCC)中,CD8+ T细胞浸润与预后不匹配,提示存在独特免疫逃逸机制。TRIM28在免疫调控中发挥作用,但其在ccRCC中的功能及作为治疗靶点的潜力尚不明确。

2

研究方法 |Methods

本研究结合Geneformer计算机模拟敲除、单细胞转录组、TCGA分析锁定TRIM28。通过Co-IP/GST pull-down/SUMO化/泛素化及CHX chase阐明机制;利用代谢组学、Seahorse、PDX模型验证。虚拟筛选鉴定Eltrombopag,联合抗PD-1体内评估疗效。

3

研究亮点 | Highlights

🔍 AI+单细胞:Geneformer模拟敲除筛选出TRIM28,高效精准。

🔗 新互作轴:TRIM28 SUMO化PARP1(K203/K486),稳定PARP1。

⚡ 双重免疫抑制:经NAD+-SIRT1-p65上调PD-L1,同时与CD8+ T细胞竞争NAD+。

💊 老药新用:Eltrombopag抑制TRIM28,联合抗PD-1增效。

🧬 临床价值:高TRIM28表达与ccRCC不良预后相关。

02

研究结果

1、TRIM28是潜在靶点

图1.通过计算机模拟基因扰动分析发现,TRIM28 是透明细胞肾细胞癌(ccRCC)中一个潜在的治疗靶点

Geneformer模拟敲除显示TRIM28缺失使ccRCC恶性细胞向正常上皮状态偏移。临床队列证实TRIM28在肿瘤中高表达,与高分期、转移及不良预后正相关,提示其作为潜在治疗靶点。

复现思路

想找新靶点?

别只靠文献。用Geneformer这类预训练模型做计算机敲除筛选,结合公共单细胞数据,能高效锁定关键基因,比盲目做实验省钱省时。

2、TRIM28调控免疫

图2.TRIM28 调控透明细胞肾细胞癌中 CD8+T 细胞介导的抗肿瘤免疫

高TRIM28表达与CD8+ T细胞浸润减少及免疫评分降低相关。TRIM28敲低增强CD8+ T细胞杀伤和IFN-γ分泌,且在免疫健全小鼠中抑制肿瘤生长,证明TRIM28通过抑制T细胞功能促进免疫逃逸

复现思路

当骨架结构确定后,你需要系统比较不同修饰基团和数量。

本研究展示了如何从C60到C70、从羟基到羧基、从二到五取代逐步优化——这是纳米药物构效关系研究的标准流程。

3、TRIM28结合PARP1

图3.TRIM28 与 PARP1 直接发生相互作用

Co-IP和GST pull-down证实TRIM28与PARP1直接结合,定位于细胞核。截短突变体显示TRIM28的RING结构域与PARP1催化结构域相互作用,为后续功能研究奠定基础。

复现思路

筛到互作蛋白后,别只做外源Co-IP,一定要做内源验证。再加GST pull-down排除间接结合,最后用截短体精细定位结构域——三步走,审稿人没话说。

4、TRIM28 SUMO化PARP1

图4.TRIM28 促进透明细胞肾细胞癌中 PARP1 的 SUMO2 依赖性类泛素化修饰

TRIM28作为E3 SUMO连接酶特异性催化PARP1的SUMO2修饰,主要位点为K203/K486。TRIM28失活突变或位点突变均消除SUMOylation,证实其关键调控作用。

复现思路

研究SUMOylation时,用Ni-NTA pull-down检测His-SUMO修饰比普通IP更敏感。同时要设E3失活突变体和SUMO位点突变体做功能回补,才能下因果结论。

5、SUMO化稳定PARP1

图5.TRIM28 的类泛素化修饰通过抑制 RNF114 介导的 K63 位泛素化修饰来调控 PARP1 的蛋白稳定性

TRIM28介导的SUMOylation通过抑制RNF114催化的K63泛素化稳定PARP1,延长其半衰期。TRIM28敲低加速PARP1降解,而过表达野生型TRIM28则相反。

复现思路

探究蛋白稳定性时,CHX chase + 泛素化实验 + 泛素链特异性抗体三者联用。本文还筛选出具体的E3泛素连接酶RNF114和K63链,证据链完整,值得借鉴。

6、轴驱动PD-L1

图6.TRIM28 与 PARP1 在肾透明细胞癌中通过 NF-κB 信号通路协同调控 PD-L1 的表达

TRIM28与PARP1协同通过NF-κB p65促进PD-L1转录。TRIM28敲低减少p65与PD-L1启动子结合,降低PD-L1表达;NF-κB抑制剂bortezomib抑制肿瘤生长并减少PD-1+CD8+ T细胞。

复现思路

发现某基因调控PD-L1后,用ChIP-qPCR验证转录因子与启动子结合,并结合GSEA和ChIP-Atlas预测靶转录因子,比盲目做荧光素酶更有方向性。

7、NAD+代谢重编程

图7.TRIM28 通过调控烟酰胺腺嘌呤二核苷酸(NAD⁺)代谢,促进程序性死亡配体 1(PD-L1)表达并介导肿瘤免疫逃逸

TRIM28过表达降低NAD+水平,通过SIRT1-p65轴上调PD-L1,同时与CD8+ T细胞竞争NAD+,抑制其糖酵解和呼吸功能。NMN补充可逆转这些效应,恢复T细胞杀伤活性。

复现思路

研究代谢与免疫的cross-talk时,分别测肿瘤细胞和共培养T细胞内的代谢物(如NAD+)和代谢功能(ECAR/OCR)。补充代谢前体NMN做功能回补,能明确建立“代谢物→功能”因果关系。

8、发现TRIM28抑制剂

图8.基于结构的筛选发现艾曲波帕是一种功能性 TRIM28 抑制剂,可增强抗肿瘤免疫

虚拟筛选鉴定Eltrombopag为TRIM28抑制剂,能减少PARP1 SUMOylation。在BALB/c小鼠中,Eltrombopag抑制肿瘤生长、增加CD8+ T细胞浸润及效应分子。联合抗PD-1在人源化PDX模型中更显著延长生存。

复现思路

筛选到候选化合物后,在免疫健全鼠和免疫缺陷鼠中同时验证,若仅在免疫健全鼠中有效,说明作用机制依赖免疫系统。之后再联合抗PD-1评估协同效应,更贴近临床转化。

03

文章小结

本研究揭示TRIM28通过SUMO化稳定PARP1,一方面经NAD+-SIRT1-p65轴上调PD-L1,另一方面与CD8+ T细胞竞争NAD+抑制其功能,双重机制驱动ccRCC免疫逃逸。靶向TRIM28的Eltrombopag可逆转耐药,联合抗PD-1增效。临床价值为ccRCC提供联合免疫治疗新策略

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  1. CONNECT:[ UseTime:0.000502s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000842s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000336s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000228s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000511s ]
  6. SELECT * FROM `set` [ RunTime:0.000229s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000490s ]
  8. SELECT * FROM `article` WHERE `id` = 510947 LIMIT 1 [ RunTime:0.000461s ]
  9. UPDATE `article` SET `lasttime` = 1778958113 WHERE `id` = 510947 [ RunTime:0.002977s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003775s ]
  11. SELECT * FROM `article` WHERE `id` < 510947 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000431s ]
  12. SELECT * FROM `article` WHERE `id` > 510947 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004196s ]
  13. SELECT * FROM `article` WHERE `id` < 510947 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003782s ]
  14. SELECT * FROM `article` WHERE `id` < 510947 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006003s ]
  15. SELECT * FROM `article` WHERE `id` < 510947 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003086s ]
0.096652s