当前位置:首页>南京>南京大学 | 糖尿病肾病治疗获突破!调节T细胞外泌体精准修复糖尿病肾病足细胞,阻断肾功能衰竭进程

南京大学 | 糖尿病肾病治疗获突破!调节T细胞外泌体精准修复糖尿病肾病足细胞,阻断肾功能衰竭进程

  • 2026-03-27 14:22:48
南京大学 | 糖尿病肾病治疗获突破!调节T细胞外泌体精准修复糖尿病肾病足细胞,阻断肾功能衰竭进程

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近日,南京大学医学院附属金陵医院(国家肾脏疾病临床医学研究中心)携手多家科研机构,在国际权威期刊《Advanced Science》上发表了一项具有里程碑意义的研究。研究团队通过对调节性T细胞来源的外泌体进行工程化改造,成功构建出能够精准靶向肾脏受损部位的RGD-Treg外泌体,并利用其携带关键微小RNA分子miR-218-5p,有效重启足细胞线粒体自噬机制,从而显著缓解糖尿病肾病(DKD)相关的足细胞损伤。这一策略为全球数以亿计的糖尿病患者及其并发症防治带来了全新的技术路径。

沉默的健康威胁:糖尿病肾病为何难治?

糖尿病肾病是糖尿病病程中最为常见且危害性极大的并发症,也是促使患者步入终末期肾病(即尿毒症)的主要推手。从生理结构来看,肾脏犹如一套精密过滤系统,而位于肾小球的滤过屏障则是防止蛋白质等大分子物质泄漏的关键防线。足细胞作为这一屏障的“最后守卫者”,其健康状态直接决定屏障功能的完整性。

然而,在持续高血糖及晚期糖基化终末产物(AGEs)的攻击下,足细胞内部一项重要的自洁机制——线粒体自噬功能被严重抑制。线粒体作为细胞的能量中枢,一旦受损便会产生大量有害物质;线粒体自噬则是清理这些“残损部件”的唯一途径。糖尿病环境下,足细胞内的这一清理机制陷于瘫痪,受损线粒体不断堆积,进而引发细胞功能障碍乃至凋亡,形成蛋白尿、肾功能恶化等一系列连锁反应。遗憾的是,目前临床尚缺乏能够从根源逆转这一病理过程的干预手段。

免疫细胞的“信使”破局:Treg外泌体显疗效

研究团队将焦点投向调节性T细胞(Treg)——一种以维持免疫耐受和组织修复著称的免疫细胞亚群。不同于传统认知中Treg直接通过细胞接触发挥作用,本次研究证实,其分泌的外泌体(Treg-Exos)是传递修复信号的重要载体。这些纳米尺度的囊泡不仅能规避细胞移植过程中的表型不稳定风险,还能高效穿透肾小球滤过膜等生理屏障,直达病灶内部。

实验数据显示,在人工构建的糖尿病微环境中,人源足细胞出现标志蛋白(如SYNPO、WT-1)显著下降、凋亡率明显上升的病理改变。而Treg-Exos干预后,上述指标均获得显著改善:足细胞骨架蛋白表达回升,细胞存活率提高,线粒体膜电位趋于稳定,线粒体自噬相关蛋白LC3活性增强。这意味着,Treg外泌体不仅能“救活”受损足细胞,更从根本上重启了其内部清洁系统。

锁死“破坏开关”:miR-218-5p精准阻断损伤信号

为进一步解密Treg外泌体背后的分子指令,研究团队对Treg-Exos及足细胞样本进行了全转录组测序,并筛选出一个关键的微小RNA——miR-218-5p。检测显示,该分子在健康人Treg外泌体中高丰度表达,却在糖尿病肾病患者的足细胞中严重缺失。

机制研究揭示,miR-218-5p的作用靶点是足细胞内一个被称作肌腱蛋白C(TNC)的基因。TNC犹如一条损伤信号链的启动器,一旦被激活,便会依次触发TLR4识别、SRC蛋白磷酸化,最终导致线粒体自噬关键调控分子FUNDC1失活。而miR-218-5p能够直接“沉默”TNC基因,从上游截断这一抑制通路,使线粒体自噬功能得以释放。

为验证这一机制,团队设计了两组对比干预:一方面下调Treg-Exos中miR-218-5p的含量,其保护效应几近消失;另一方面通过过表达技术提升其负荷,修复效果显著增强。这一系列实验清晰地表明,miR-218-5p正是Treg外泌体发挥治疗效应的核心“钥匙”。

升级导航系统:RGD肽赋能精准投送

尽管Treg-Exos本身具备修复潜力,但其体内分布仍存在非特异性问题,主要被肝脏截获,抵达肾脏足细胞的效率有限。为此,研究团队引入分子工程手段,在外泌体膜表面修饰上可与足细胞表面整合素ITGAV特异性结合的RGD短肽,成功构建出“导航增强版”RGD-Treg-Exos。

活体成像结果显示,普通外泌体主要滞留于肝区,而RGD-Treg-Exos展现出显著的肾脏聚集特征,尤其在肾小球足细胞区域高度富集。在糖尿病小鼠模型中,RGD-Treg-Exos干预组肾小球系膜扩张、基底膜增厚及足突融合等病理改变显著轻于普通外泌体组;尿白蛋白/肌酐比值明显下降,肾功能指标改善更彻底,线粒体自噬修复程度更高。

从源头干预到临床应用:一个全新治疗赛道正在成形

这项研究的意义不仅在于揭示了糖尿病肾病足细胞损伤的全新分子机制,更重要的是,它提供了一种具备临床转化潜力的“精准修复工具”。与传统药物相比,RGD-Treg-Exos展现出三大核心优势:

  • 高生物安全性:外泌体源于自体Treg细胞,免疫原性极低,无细胞治疗相关致瘤或异位分化风险;

  • 强靶向能力:RGD肽修饰使外泌体实现器官及细胞级别双重精准递送,降低非靶向副作用;

  • 机制清晰可控:通过miR-218-5p/TNC/TLR4/SRC/FUNDC1信号轴,从病理链条的起始环节进行干预,打破损伤恶性循环。

目前,研究已在动物模型中完成为期8周的长期疗效评估,结果显示治疗组小鼠肾纤维化程度与血清肌酐水平均显著下降,且未观察到明显毒性反应。随着后续临床转化研究持续推进,这种基于工程化外泌体的靶向递送平台,或将成为糖尿病肾病治疗领域的一项重要突破,为数亿患者提供摆脱透析、延缓肾衰竭进程的新可能。

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  1. CONNECT:[ UseTime:0.000835s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001273s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000657s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000611s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001163s ]
  6. SELECT * FROM `set` [ RunTime:0.000548s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001106s ]
  8. SELECT * FROM `article` WHERE `id` = 486334 LIMIT 1 [ RunTime:0.000475s ]
  9. UPDATE `article` SET `lasttime` = 1775300007 WHERE `id` = 486334 [ RunTime:0.001693s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000253s ]
  11. SELECT * FROM `article` WHERE `id` < 486334 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000523s ]
  12. SELECT * FROM `article` WHERE `id` > 486334 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001662s ]
  13. SELECT * FROM `article` WHERE `id` < 486334 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000999s ]
  14. SELECT * FROM `article` WHERE `id` < 486334 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000815s ]
  15. SELECT * FROM `article` WHERE `id` < 486334 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000839s ]
0.162578s