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IF38.7!南京医科大学“国自然”轻松拿下双一区TOP!:SNO-Septin2-RAC1轴促主动脉瘤/夹层!

  • 2026-05-09 14:25:06
IF38.7!南京医科大学“国自然”轻松拿下双一区TOP!:SNO-Septin2-RAC1轴促主动脉瘤/夹层!
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引言

主动脉夹层与动脉瘤是致死率极高的心血管疾病,目前缺乏有效药物。南京医科大学研究发现,巨噬细胞中Septin2蛋白的Cys111位点发生S-亚硝基化修饰,通过减弱其与TIAM1的相互作用,激活TIAM1-RAC1-NF-κB信号轴,促进炎症和细胞外基质降解,从而加剧疾病进展。通过基因突变或药物干预该通路,可显著缓解病变。

本研究揭示了SNO-Septin2作为主动脉疾病的新型驱动因子,并为R-Ketorolac的临床再利用提供了依据。

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:Septin2的S-亚硝基化通过在巨噬细胞中耦合TIAM1-RAC1轴加剧主动脉瘤和夹层

发表期刊:Circulation

发表时间:2024年6月11日

影响因子:38.7/Q1

研究背景

S-亚硝基化是一种典型的基于氧化还原的翻译后修饰,与心血管疾病有关。主动脉瘤和夹层是高风险的心血管疾病,目前没有有效的治愈方法。本研究的目的是确定Septin2在巨噬细胞中的SNO在主动脉瘤和夹层中的作用。

研究方法

采用生物素交换法联合液相色谱-串联质谱,鉴定了主动脉夹层患者及AngII诱导小鼠主动脉中的S-硝基化蛋白。通过主动脉瘤和夹层模型,明确SNO-Septin2的致病作用。RNA测序分析其转录组影响,质谱和免疫共沉淀揭示TIAM1-RAC1为下游靶轴,并用R-酮洛拉辛和NSC23766进行干预验证

research results
研究结果
01
SNO-Septin2在主动脉瘤/夹层中显著升高

在心肌缺血再灌注模型中,心肌细胞胞浆中双链DNA水平显著升高cGAS和STING蛋白表达上调,主要发生在缺血边界区。免疫荧光和Western blot结果证实,I/R诱导了cGAS-STING通路的激活,而在cGAS或STING基因敲除的心肌细胞中,这种上调被抑制(图1)

图1Septin2的SNO在主动脉瘤和夹层中显著增加

02

Cys111突变减轻AngII诱导的主动脉瘤

与Apoe⁻/⁻小鼠相比,Apoe⁻/⁻Sept2C111A小鼠在AngII输注28天后,主动脉扩张、动脉瘤发生率、死亡率、弹性纤维断裂、MMP活性和巨噬细胞浸润均显著减轻,且血压无差异(图2)

图2 Septin2的Cys111突变缓解主动脉瘤

03

巨噬细胞Cys111突变减轻主动脉瘤抑制炎症和基质降解

骨髓移植实验显示,接受Sept2C111A骨髓的Apoe⁻/⁻小鼠在AngII刺激下,主动脉扩张、动脉瘤严重程度、弹性纤维降解、MMP活性和巨噬细胞浸润均显著降低。RNA-seq和qPCR证实,炎症因子和MMP9表达下降(图3)

图3 通过Cys111突变抑制巨噬细胞中S-硝基化Septin2通过限制血管炎症和细胞外基质降解来缓解主动脉瘤

04
SNO-Septin2通过RAC1/NF-κB通路促进巨噬细胞炎症和迁移

Sept2C111A巨噬细胞受TNF-α刺激后,炎症因子和迁移能力下降,NF-κB通路受抑,p65磷酸化及核转位减少。蛋白组学筛选显示RAC1活性降低,CN04可逆转上述效应(图4)

图4 S-硝基化Septin2通过RAC1/NF-κB通路诱导巨噬细胞炎症和迁移

05

SNO-Septin2通过与TIAM1耦合激活RAC1

Co-IP和PLA证实Septin2与TIAM1结合;Cys111突变增强该结合、减少TIAM1-RAC1结合。Septin2通过GTP域与TIAM1的DH/PHc域竞争,SNO修饰削弱竞争,促进RAC1活化(图5)

图5 S-硝基化的Septin2通过与TIAM1结合触发RAC1的激活

06

TIAM1敲低或NSC23766抑制巨噬细胞炎症和迁移

NSC23766或siTIAM1可显著降低TNF-α诱导的炎症因子表达、细胞迁移、RAC1活性和NF-κB信号通路(图6)

图6 TIAM1缺失或NSC23766可减轻巨噬细胞炎症和迁移

07

 NSC23766 减轻主动脉瘤和夹层

在AngII和BAPN模型中,NSC23766处理显著降低动脉瘤发生率、主动脉直径、死亡率、弹性纤维断裂、MMP活性、巨噬细胞浸润和炎症因子表达(图7)

图7 NSC23766通过抑制TIAM1/RAC1轴缓解主动脉瘤的形成

08

R-Ketorolac预防AngII诱导的主动脉瘤

R-Ketorolac口服给药显著减轻主动脉扩张、动脉瘤严重程度、炎症因子、MMP活性、巨噬细胞浸润和MMP9表达,且无毒性表现(图8)

图8 R-酮咯酸可预防小鼠因血管紧张素II引起的主动脉瘤

Article Summary
文章小结

本研究揭示巨噬细胞中SNO-Septin2通过激活TIAM1-RAC1轴及NF-κB通路,加剧炎症与基质降解,促进主动脉瘤和夹层发生。靶向该通路可显著减轻病变,提示R-Ketorolac具有潜在治疗价值。

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:0.000937s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000842s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000348s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000520s ]
  6. SELECT * FROM `set` [ RunTime:0.000242s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000551s ]
  8. SELECT * FROM `article` WHERE `id` = 543407 LIMIT 1 [ RunTime:0.000487s ]
  9. UPDATE `article` SET `lasttime` = 1779202415 WHERE `id` = 543407 [ RunTime:0.014029s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000281s ]
  11. SELECT * FROM `article` WHERE `id` < 543407 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000472s ]
  12. SELECT * FROM `article` WHERE `id` > 543407 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000408s ]
  13. SELECT * FROM `article` WHERE `id` < 543407 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009899s ]
  14. SELECT * FROM `article` WHERE `id` < 543407 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000745s ]
  15. SELECT * FROM `article` WHERE `id` < 543407 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.019435s ]
0.201571s