当前位置:首页>南京>南京大学ACS Nano | 生物正交点击微针毛发再生 | 点击化学微针实现基因持续表达重塑毛囊持久再生

南京大学ACS Nano | 生物正交点击微针毛发再生 | 点击化学微针实现基因持续表达重塑毛囊持久再生

  • 2026-05-10 09:00:34
南京大学ACS Nano | 生物正交点击微针毛发再生 | 点击化学微针实现基因持续表达重塑毛囊持久再生
一、研究背景
脱发是临床常见的皮肤疾病,现有药物如米诺地尔与非那雄胺虽能暂时缓解症状,但需长期用药且疗效有限,而重组生长因子虽具有促毛囊再生潜力,却受限于皮肤屏障、快速降解与局部暴露不足等瓶颈基因治疗通过AAV载体可实现治疗性蛋白的持续表达,但如何将病毒高效递送至真皮靶区并保持其感染活性,同时避免系统性暴露与免疫原性风险,仍是亟待解决的关键科学问题。
二、研究思路
通过生物正交点击化学构建了“微针-病毒界面”(ClickMNp),利用DBCO修饰的透明质酸与叠氮化修饰的PLGA微针发生无催化剂SPAAC反应,形成共价交联水凝胶层,实现AAV病毒的高效固定与活性保持,从而将传统病毒递送中“局部滞留差、转导效率低、易失活”等局限重构为“精准植入、持续释放、长效表达”的协同体系,该策略通过一次应用实现长达四周的局部aFGF表达,协同激活Wnt/β-catenin与Shh通路,最终在反复脱发模型中实现毛囊再生与结构重塑。
三、研究内容
作者首先构建了基于点击化学的微针递送系统ClickMNP,通过HA-DBCO与PLGA-N3发生SPAAC反应,在微针表面形成交联水凝胶层,实现AAV稳定固定并保持生物活性,从而建立局部基因递送界面。
图1:ClickMNP构建原理及AAV-aFGF作用机制。
随后构建并筛选不同启动子的AAV-aFGF体系,结果显示PGK启动子在成纤维细胞和内皮细胞中具有更高表达效率,同时显著提升aFGF分泌水平及细胞增殖能力。
图2:AAV-aFGF构建及表达与功能验证。
在材料与器件层面,ClickMNP具有良好的结构完整性与力学性能,可有效穿透皮肤并实现局部递送,同时体内成像显示其能够实现皮肤特异表达并显著减少系统分布。
图3:ClickMNP结构表征、穿透性能及体内分布。
在体内脱发模型中,ClickMNP显著加速毛发再生过程,表现为更高毛发覆盖率与毛囊数量,并在多轮脱毛模型中维持稳定疗效,优于传统药物及系统给药方式。
图4:毛发再生效果及长期疗效评估。
转录组分析表明,ClickMNP显著调控细胞周期、Wnt信号及血管生成相关通路,同时促进细胞迁移与分化过程,揭示其促进毛囊再生的分子基础。
图5:转录组分析及信号通路富集。
机制研究显示,AAV-aFGF可显著促进真皮乳头细胞增殖与迁移,并通过激活MAPK与PI3K-Akt等通路增强毛囊再生能力,同时抑制炎症相关因子表达。
图6:细胞功能及分子机制验证。
进一步机制整合与通路验证显示,ClickMNP通过持续aFGF表达协同激活Wnt/β-catenin等关键再生通路并维持毛囊生长周期,从整体上重塑毛囊再生网络。
图7:毛囊再生机制整合与信号通路模型。
四、全文总结
通过构建基于点击化学的微针递送系统ClickMNP,实现AAV在皮肤中的稳定固定与持续表达,突破传统基因递送中易扩散、难滞留的限制,在此过程中微针提供精准递送通道而点击化学界面形成局部基因储库,实现aFGF长期表达并持续激活成纤维细胞、血管生成及Wnt等关键通路,最终在脱发模型中实现高效且持久的毛囊再生效果,为皮肤基因治疗提供了一种兼具精准性与持续性的全新策略。
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  1. CONNECT:[ UseTime:0.000555s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000622s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006571s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006542s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000780s ]
  6. SELECT * FROM `set` [ RunTime:0.000265s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000596s ]
  8. SELECT * FROM `article` WHERE `id` = 554802 LIMIT 1 [ RunTime:0.001913s ]
  9. UPDATE `article` SET `lasttime` = 1778405190 WHERE `id` = 554802 [ RunTime:0.010409s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.005503s ]
  11. SELECT * FROM `article` WHERE `id` < 554802 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009512s ]
  12. SELECT * FROM `article` WHERE `id` > 554802 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002723s ]
  13. SELECT * FROM `article` WHERE `id` < 554802 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001133s ]
  14. SELECT * FROM `article` WHERE `id` < 554802 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000893s ]
  15. SELECT * FROM `article` WHERE `id` < 554802 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002300s ]
0.121168s