当前位置:首页>南京>先扑火,后修墙:南京金陵医院张龙江等人通过微针贴片递送镁离子+基因疗法破解心梗修复难题

先扑火,后修墙:南京金陵医院张龙江等人通过微针贴片递送镁离子+基因疗法破解心梗修复难题

  • 2026-06-01 12:06:25
先扑火,后修墙:南京金陵医院张龙江等人通过微针贴片递送镁离子+基因疗法破解心梗修复难题

心肌梗死,俗称心梗,是全球范围内导致死亡和心力衰竭的头号杀手之一。据《中国心血管健康与疾病报告2022》,我国现有心梗患者约250万人,每年新发心梗约60万例;即使及时接受了支架或溶栓治疗,仍有相当一部分患者的心脏会逐步走向衰竭。有研究显示,心梗后一年内发生心力衰竭的比例可高达20%以上,而心衰患者的五年生存率与恶性肿瘤相当。

为什么心梗之后心脏还是得这么快?原因在于心梗后的修复过程分为两个截然不同的阶段:先是火烧得太旺的炎症期,免疫细胞大量涌入,虽然有助于清除坏死组织,但也可能误伤幸存的心肌细胞;随后进入修补过头的纤维化期,成纤维细胞疯狂分泌胶原从而导致心脏变硬、变形、收缩无力,传统治疗往往只盯着其中一个阶段,效果自然大打折扣。那么,有没有一种办法能像定时双模特工一样,先精准灭火,再适度修墙?

2026420日一篇发表在国际杂志ACS Nano(新锐1区,IF=16.1)上题为“Spatiotemporally Orchestrated Cardiac Microneedle Patch Modulates Post-Infarction Immunity and Fibrosis”的研究报告中,来自南京大学医学院附属金陵医院张龙江教授等人通过研究成功开发了一种可降解的珠状微针贴片,其能在心肌梗死后先快速释放镁离子抑制早期过度炎症与细胞死亡,再缓释腺相关病毒介导的白介素-10阻断后期病理性纤维化。这种先抗炎后抗纤维化的时空协调策略能显著缩小梗死面积并改善机体心脏功能,为动态病程的精准治疗提供了全新范式。

心梗修复的时间密码藏在基因里

这项研究中,研究人员并没有盲目开药,而是先回到人的数据中寻找答案,他们分析了心梗患者的外周血和心脏组织的单细胞测序数据后清晰看到:在急性心梗阶段,肿瘤坏死因子、白介素-17等促炎信号通路被高度激活,而到了心梗后30天,炎症基本消退,取而代之的是细胞外基质受体、黏着斑等纤维化相关通路的持续活跃。更有意思的是,在纤维化区域仍高表达CXCL12CCL5等慢性炎症趋化因子,说明炎症并未完全熄火而是换了一种慢烧的方式。

这些发现揭示了一个关键事实,即心梗修复不是单一事件,而是一条动态演变的时间线,治疗要想有效就必须与这条时间线合拍。

图:基于批量测序和单细胞RNA测序揭示心肌梗死患者的免疫与

纤维化动态变化。

一款会分时工作的微针贴片

基于上述病理特征,研究人员设计了一款名为“Mg-AAV-MN”的可完全降解微针贴片,贴片的基材是海藻酸钠水凝胶,上面排列着数十根珠状微针,每根针里同时装载了两种智能武器

第一种武器是镁离子,其被包裹在一种对活性氧(ROS)敏感的脂质纳米颗粒中。心肌梗死后,局部会产生大量ROS,这种氧化环境会剪断纳米颗粒中的硫缩酮键从而加速镁离子的释放。第二种武器是携带白介素-10IL-10)基因的腺相关病毒(AAV9型),其会缓慢进入心肌细胞,在约一周后开始稳定表达IL-10蛋白。

为什么要做成珠状?因为心脏不停跳动,普通微针容易被出来,有限元模拟和离体组织拉拔实验证实,珠状微针的最大拉出力是传统锥形微针的近四倍黏得更牢,干得更稳。该研究中的实验对象为雄性SD大鼠,研究人员通过结扎左前降支冠状动脉来建立心梗模型,术后,贴片直接按压在心脏的梗死区域表面随后自然降解;研究人员在术后第3天(急性炎症高峰)和第28天(纤维化重塑期)分别取样检测。

图:镁离子与白介素-10的体外心脏保护作用。

两个时段,两场胜仗

术后第3天的结果显示,含镁离子的贴片(无论是否含病毒)能显著限制早期心肌损伤。MI组(心肌梗死组,仅造模不治疗)的梗死面积达到57.3%,而镁离子治疗组降至31.1%左右;同时心肌组织中的中性粒细胞浸润明显减少,活性氧水平下降,促炎性的iNOS阳性巨噬细胞比例降低,抗炎性的CD206阳性巨噬细胞比例上升。血清中的炎性因子IL-1βIL-6TNF-α也同步下降;此外,心肌细胞的凋亡率和焦亡(一种炎症性细胞死亡)相关蛋白(如cleaved caspase-1cleaved GSDMD)均被有效抑制。

到了第28天,联合治疗组的优势更加突出,仅用镁离子或仅用IL-10病毒的单方治疗组,左心室射血分数(LVEF)约为48%–50%;而镁离子与IL-10病毒联用的Mg-AAV-MN组,LVEF提升至59.6%Masson染色和天狼星红染色均显示,联合组的胶原沉积面积最小,心室壁厚度保持得最好,I型和III型胶原的表达显著下降,转录组测序进一步证实,联合组中TGF-β信号通路、细胞外基质受体通路和黏着斑通路均被显著抑制。安全性方面也令人放心,术后28天检测肝肾功能指标(ALTASTBUN、肌酐),与假手术组均无统计学差异,主要脏器组织切片未见明显损伤。

图:镁离子脂质纳米颗粒与镁离子腺相关病毒微针的表征。

赢在时序,而非剂量

研究者指出,这项研究把两种已知的老药按照疾病的时间轴精准编排,镁离子在急性期快速释放,扑灭过度的炎症和细胞死亡;IL-10在数天后缓慢登场,精准抑制后期的异常纤维化。一个打头阵,一个收尾,互不干扰,协同增效。这或许就提示一个更普适的道理:对于像心梗这类病程分阶段、病理机制高度动态的疾病,治疗效果的天花板往往不是由药物的强度决定,而是由时机决定,与其盲目加大剂量或延长给药,不如学会看人下菜碟,让治疗手段与疾病节拍共舞。

当然,这项研究目前仍处于动物实验阶段,但从实验室到临床,其至少提供了一把新钥匙:一张会思考的贴片或许就是未来心梗治疗的下一个突破口。

参考文献:

Yanshan ChenLinlin ZhangYu Ding, et al. Spatiotemporally Orchestrated Cardiac Microneedle Patch Modulates Post-Infarction Immunity and Fibrosis,ACS Nano,April 20, 2026,doi:10.1021/acsnano.6c02542

通讯作者简介:

张龙江,南京大学医学院附属金陵医院放射诊断科主任,主任医师,教授,博士研究生导师。研究方向:心脑血管影像、影像组学、人工智能、分子影像、神经功能影像等。更多阅读:https://med.nju.edu.cn/zlj1/

免责声明: 本文仅供参考,不构成医疗、法律或专业建议。文章内容旨在普及生物医学知识,不能替代专业医生的诊断、建议或治疗。若有任何健康问题或医疗需求,请务必咨询具有执业资格的医疗专业人员。

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  1. CONNECT:[ UseTime:0.000932s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001405s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.048804s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000906s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001450s ]
  6. SELECT * FROM `set` [ RunTime:0.017921s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001580s ]
  8. SELECT * FROM `article` WHERE `id` = 562207 LIMIT 1 [ RunTime:0.017630s ]
  9. UPDATE `article` SET `lasttime` = 1780595348 WHERE `id` = 562207 [ RunTime:0.049063s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.007227s ]
  11. SELECT * FROM `article` WHERE `id` < 562207 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006046s ]
  12. SELECT * FROM `article` WHERE `id` > 562207 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007566s ]
  13. SELECT * FROM `article` WHERE `id` < 562207 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002007s ]
  14. SELECT * FROM `article` WHERE `id` < 562207 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002135s ]
  15. SELECT * FROM `article` WHERE `id` < 562207 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000982s ]
0.242804s