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IF 7.4!恭喜南京医科大学院长“国自然”最新成果斩获一区TOP!

  • 2026-03-31 01:57:16
IF 7.4!恭喜南京医科大学院长“国自然”最新成果斩获一区TOP!
{生信分析 }

📍主动脉夹层还停留在“破了再修”的被动模式🤔?

📍南京医科大学这项研究,将治疗关口从急诊手术推向早期干预。

👉 临床痛点:胸主动脉夹层(TAD)起病急、死亡率高,目前除急诊外科手术外无任何有效药物,长期处于“无药可治”的空白地带。

✨ 两大转化突破

✅ 早期预警:TAD患者血浆ELA水平显著下降(AUC=0.77),通过ELISA试剂盒即可检测,为临床提供低成本早筛工具

✅ 机制解锁:首次揭示ELA通过抑制NETosisNLRP3炎症通路,调控血管壁细胞互作网络,延缓夹层进展。

这不仅是“又多了一个分子”,更是为胸主动脉夹层这一临床“无人区”填补了药物治疗空白👏!

文献解读
研究背景

胸主动脉夹层(TAD)起病凶险、死亡率高,目前临床除急诊手术外无任何有效药物,长期处于“无药可治”的空白状态。血管平滑肌细胞(VSMC)稳态失衡和中性粒细胞胞外陷阱(NETosis)介导的炎症反应在TAD发病中起关键作用,但缺乏有效的干预靶点。

研究目的

本研究旨在探究内源性多肽ELABELA(ELA)在TAD发生发展中的保护作用,明确其是否通过维持VSMC稳态和调控NETosis发挥抗夹层效应,并评估ELA作为TAD早期诊断标志物和治疗靶点的临床转化潜力。

研究方法

研究综合运用TAD患者血浆样本、血管紧张素II诱导的TAD小鼠模型及细胞共培养体系,通过ELISA检测ELA水平并与夹层发生风险进行关联分析。采用基因敲除、腺病毒过表达、免疫荧光染色等技术验证ELA对VSMC表型转换和NETosis的调控作用,结合转录组测序和信号通路抑制剂实验阐明ELA抑制NLRP3炎症通路的分子机制。

研究结果

ELA抑制TAD进展:本研究首次证实内源性多肽ELA在胸主动脉夹层中发挥关键保护作用。在血管紧张素II诱导β-氨基丙腈联合血管紧张素II两种经典TAD小鼠模型中,持续泵入ELA多肽均可显著降低夹层相关死亡率【图1D】。通过主动脉大体形态观察【图1B】、超声动态监测及组织病理学染色【图1E, 1H】分析发现,ELA治疗可显著抑制主动脉扩张,减轻血管中膜弹性纤维的断裂与降解【图1F, 1G】,证实ELA能够有效延缓TAD的病理进程。

ELA维持VSMC稳态:

胸主动脉夹层的核心病理机制在于血管平滑肌细胞(VSMC)的稳态失调。本研究证实,ELA输注可显著上调TAD小鼠主动脉中收缩型VSMC标志蛋白的表达【图1I-1L】,同时有效抑制细胞凋亡【图1M-1O】,从而恢复VSMC的正常功能表型。与此同时,ELA还能够显著抑制基质金属蛋白酶的异常活化【图1P, 1Q】,减少细胞外基质的过度降解,从而有效维护主动脉壁的结构完整性。

ELA逆转VSMC损伤:

为验证ELA对血管平滑肌细胞的直接调控作用,研究者使用血小板衍生生长因子处理人主动脉VSMC。结果显示,PDGF刺激后,细胞内源性ELA的表达水平显著下调【图2A-2C】。补充外源性ELA可显著逆转VSMC由收缩表型向合成表型的恶性转换【图2D】,并有效抑制高浓度PDGF诱导的细胞凋亡【图2F, 2G】。上述保护效应可被APJ受体拮抗剂ML221完全阻断【图2H-2K】,证实ELA通过其同源受体APJ发挥维持VSMC稳态的关键功能。

ELA保护依赖APJ:

为在体内水平进一步验证APJ受体是否介导ELA的保护效应,研究者对TAD小鼠给予ELA输注的同时,联合使用APJ拮抗剂ML221进行干预。结果显示,ML221几乎完全抵消了ELA带来的生存获益【图3D】及其抑制主动脉扩张的保护作用【图3E, 3F】。各组小鼠的血压与心率水平均无显著差异【图3I-3L】,表明ELA是直接作用于血管壁发挥保护效应,而非通过影响血流动力学间接起效。

ELA调控炎症NETs:

主动脉转录组测序分析显示,ELA输注可显著下调NOD样受体信号通路中性粒细胞胞外陷阱形成相关基因的表达水平【图4C, 4D】。进一步的实验验证表明,ELA能够显著抑制主动脉组织中NLRP3炎症小体及其下游效应分子IL-1β的激活【图4E-4G】,同时有效降低循环中中性粒细胞胞外陷阱标志物的水平【图4H-4M】,提示ELA通过抗炎和调控NETs双重途径发挥血管保护作用。

ELA双重抑制NETs:

机制层面,研究者揭示了一个双向调控环路。一方面,ELA可直接作用于中性粒细胞,通过抑制NOX2介导的活性氧生成,有效阻断NETs的形成【图5C-5G】。另一方面,在血管平滑肌细胞中,ELA通过结合APJ受体激活AMPK信号通路,抑制PDGF诱导的NLRP3炎症小体活化IL-1β分泌【图6A-6C, 6P, 6Q】,从而减少由VSMC来源的IL-1β所触发的NETosis【图6E, 6G】。

NETs反噬VSMC:

值得注意的是,NETs一旦形成,又会反向作用于血管平滑肌细胞,形成恶性循环。研究发现,NETs可激活VSMC表面的TLR4受体,触发NLRP3炎症小体活化【图6L, 6M】,进而诱导VSMC发生表型转换【图6I-6K】,形成NETs→炎症→VSMC失调→更多炎症的正反馈恶性循环。而ELA能够同时作用于这一循环的两端——既抑制中性粒细胞NETs形成,又保护VSMC免受炎症损伤,从而有效阻断TAD的进展。

临床验证:

最后,研究团队在临床样本中验证了上述发现的转化价值。与健康对照组相比,TAD患者主动脉组织中的ELA及其受体APJ表达水平均显著下调【图7A-7D】,同时血浆ELA浓度明显降低NETs标志物水平显著升高【图7E-7G】,进一步支持ELA作为TAD生物标志物和治疗靶点的临床潜力。相关性分析显示,血浆ELA水平与NETs标志物呈显著负相关【图7H】。低血浆ELA对TAD具有潜在的诊断价值【图7I】,且与更高的患病风险密切相关【图7J】,提示ELA有望成为TAD早期筛查、风险分层和临床管理的新型生物标志物

文章小结
本研究首次揭示ELA蛋白通过维持血管平滑肌细胞稳态、抑制NETosis及NLRP3炎症通路,发挥保护主动脉壁、延缓胸主动脉夹层进展的关键作用。临床数据显示,TAD患者血浆ELA水平显著降低,且与疾病风险及NETs水平密切相关,提示ELA不仅是潜在的无创诊断标志物,更有望成为填补胸主动脉夹层药物治疗空白的全新干预靶点

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  1. CONNECT:[ UseTime:0.000639s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000987s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000612s ]
  6. SELECT * FROM `set` [ RunTime:0.000224s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000696s ]
  8. SELECT * FROM `article` WHERE `id` = 506371 LIMIT 1 [ RunTime:0.000567s ]
  9. UPDATE `article` SET `lasttime` = 1775001955 WHERE `id` = 506371 [ RunTime:0.004217s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000668s ]
  11. SELECT * FROM `article` WHERE `id` < 506371 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000610s ]
  12. SELECT * FROM `article` WHERE `id` > 506371 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000569s ]
  13. SELECT * FROM `article` WHERE `id` < 506371 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003510s ]
  14. SELECT * FROM `article` WHERE `id` < 506371 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001532s ]
  15. SELECT * FROM `article` WHERE `id` < 506371 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003447s ]
0.084946s