当前位置:首页>南昌>南昌大学团队《Theranostics》:HAMA双功能诊疗微针贴片,实现糖尿病创面免疫调控与实时监测

南昌大学团队《Theranostics》:HAMA双功能诊疗微针贴片,实现糖尿病创面免疫调控与实时监测

  • 2026-07-15 05:35:21
南昌大学团队《Theranostics》:HAMA双功能诊疗微针贴片,实现糖尿病创面免疫调控与实时监测

HAMA水凝胶双层微针贴片核心作用

本研究选用甲基丙烯酰化透明质酸(HAMA)作为微针针尖基质,具备优异可注射光固化成型能力,可均匀负载ZTCG纳米酶,同时拥有良好生物相容性、多孔结构利于物质交换与细胞浸润,还能响应创面高ROS微环境实现活性物质按需缓释,作为功能载体支撑微针微创刺入皮肤、长效发挥抗氧化、抗菌与免疫调控修复作用。

图1 双层诊疗微针贴片(MNs@Z/CP)制备流程及促糖尿病创面愈合机制示意图

研究背景

糖尿病是全球重大公共卫生问题,糖尿病溃疡作为糖尿病高发并发症,患者创面长期陷入炎症-感染-氧化应激恶性循环,伴随活性氧(ROS)大量蓄积、免疫紊乱、细菌定植及生物膜形成,常规敷料与治疗手段难以动态响应创面复杂病理微环境,无法兼顾实时监测与精准治疗,创面愈合难度极大。针对这一临床痛点,南昌大学联合多单位团队开发双层结构双功能诊疗微针贴片(MNs@Z/CP),以甲基丙烯酰化透明质酸(HAMA)为微针基底,集多酶催化抗氧化、广谱抗菌、免疫调控、过氧化氢(HO)可视化实时监测于一体,为糖尿病慢性创面、耐药菌感染创面的智能化自主管理提供全新解决方案。

论文信息

论文题目:A dual functional theranostic microneedle patch for immunomodulation and real time monitoring in diabetic wound therapy

发表期刊:Theranostics

DOI:10.7150/thno.133451

EFL合作产品

产品型号

产品名称

EFL-HAMA系列

甲基丙烯酰化透明质酸(HAMA)

MNs@Z/CP双功能微针系统的核心优势与作用

(1)动态可视化监测:背衬层Ce-MOF可特异性响应创面HO,Ce³氧化为Ce伴随白→黄色颜色转变,颜色强度与HO浓度线性相关,高抗干扰性,可实时、半定量评估创面氧化应激与炎症程度。

(2)强效抗氧化+改善缺氧:ZTCG纳米酶具备级联SOD、CAT模拟活性,高效清除O₂⁻OH、HO等多种ROS,原位产氧缓解创面缺氧,阻断氧化应激与炎症的恶性循环。

(3)广谱抗菌+清除生物膜:破坏细菌细胞膜、增加膜通透性,实现对大肠杆菌、MRSA耐药菌高效杀灭,同时瓦解成熟细菌生物膜,解决糖尿病创面耐药感染难题。

(4)精准免疫调控:激活内源性Nrf2/HO-1抗氧化通路,抑制炎症因子释放,诱导巨噬细胞表型重编程,构建利于组织修复的免疫微环境。

(5)促创面修复多效协同:依托HAMA水凝胶优异的生物相容性与细胞亲和性,促进成纤维细胞增殖、迁移及内皮细胞血管生成,加速胶原沉积、上皮再生与血管成熟,全方位加快创面愈合。

(6)优异生物安全性:HAMA基底、功能纳米材料及传感层整体生物相容性佳,溶血率、细胞毒性均符合医用标准,体内应用无明显脏器毒性;微针机械强度充足,植入后可顺利穿透皮肤且微创损伤小。

研究参考

一、核心功能材料合成与微针制备(图2-3)

1.ZTCG纳米酶合成

以ZIF-8为前驱体,经单宁酸(TA)刻蚀形成中空结构,再配位Cu²、Ga³构筑金属-多酚网络(MPN),得到中空ZTCG纳米酶。该材料可在高HO环境下响应降解,持续释放活性成分,实现长效治疗。

2.Ce-MOF传感材料合成

以硝酸铈、对苯二甲酸(TPA)为原料合成Ce-MOF,原始形貌为花状;接触HO后晶型转变为棒状,伴随明显颜色变化,对葡萄糖、电解质、尿酸等创面常见物质无响应,特异性优异。

3.双层微针贴片制备

针尖功能层:配置5%w/vHAMA水溶液,加入ZTCG纳米酶与0.25%LAP光引发剂,混合均匀后注入PDMS模具,经离心、脱泡、光交联固化,得到微针阵列。微针高度600μm,基底直径360μm,机械强度满足皮肤穿刺要求。

背衬传感层:采用静电纺丝技术制备PCL纤维膜,表面喷涂Ce-MOF溶液制成CP传感膜,最后与HAMA微针复合,得到成品MNs@Z/CP双层微针。

图2 ZTCG纳米酶表征

图3 MNs@Z/CP双层微针物理性能与过氧化氢显色传感

二、ZTCG纳米酶体外活性验证(图4-5)

类酶活性与自由基清除:ZTCG呈浓度依赖性清除各类ROS,200μg/mL浓度下HO清除率可达87.75%,催化产氧能力优异,类CAT活性优于多数同类纳米酶。

抗菌与抗生物膜:200μg/mLZTCG对MRSA、大肠杆菌抑菌率分别为98.55%、99.37%;可彻底破坏成熟生物膜,通过损伤细胞膜实现杀菌。

图4 ZTCG多酶活性与抗氧化性能

图5 ZTCG纳米酶抗菌及抗生物膜效果验证

三、体外细胞实验(图6-7)

抗氧化损伤:在HO诱导的细胞氧化应激模型中,MNs@Z/CP可显著降低细胞内ROS水平、恢复线粒体膜电位,提升成纤维细胞、内皮细胞存活率。

促细胞修复:有效改善氧化应激造成的细胞迁移障碍、血管生成缺陷。

巨噬细胞极化:在LPS诱导炎症模型中,激活Nrf2/HO-1通路,下调M1型促炎标志物(iNOS、TNF-α、IL-6),上调M2型修复标志物(CD206、IL-10),完成巨噬细胞表型重编程。

图6 体外炎症微环境下MNs@Z/CP促进细胞增殖、迁移与血管生成

图7 体外MNs@Z/CP通过激活Nrf2/HO-1通路重编程巨噬细胞

四、普通糖尿病创面体内疗效(大鼠STZ糖尿病模型,图8)

构建大鼠全层皮肤缺损糖尿病创面模型,分组干预后结果:

创面愈合:干预第12天,MNs@Z/CP组创面闭合率达83.17%,创面完整上皮化,肉芽组织致密。

组织修复:Masson染色显示胶原沉积量最高、排列规整;CD31、α-SMA染色证实新生血管数量多、血管成熟度高。

体内免疫调控:创面M2型巨噬细胞占比显著提升,炎症细胞浸润大幅减少。

图8 MNs@Z/CP对单纯糖尿病创面的体内修复疗效

五、转录组机制分析(图9)

对创面组织进行转录组测序,结果表明:MNs@Z/CP可下调IL-17炎症信号通路,抑制炎症级联反应;激活细胞周期通路,促进细胞增殖;同时上调CAT、GPX7等抗氧化酶基因,从分子层面解释抗炎、抗氧化、促修复机制。

图9 MNs@Z/CP调控糖尿病创面微环境的转录组分子机制

六、MRSA感染型糖尿病创面体内疗效(图10)

针对临床难治的耐药菌感染创面模型开展验证:

抗菌效果:干预第9天,创面细菌清除率高达94.88%,创面脓肿、渗出明显减少。

抗炎与修复:创面促炎因子TNF-α、IL-6表达显著降低,巨噬细胞M2/M1比值大幅提升,胶原沉积与血管新生效果突出。

生物安全性:治疗15天后,大鼠心、肝、脾、肺、肾等脏器无病理损伤,体内应用安全。

图10 MRSA感染糖尿病创面修复效果

研究总结

本研究成功制备基于HAMA水凝胶的MNs@Z/CP双层诊疗微针贴片,整合ZTCG纳米酶治疗体系与Ce-MOF可视化传感体系,实现实时监测、抗氧化、抗菌、免疫调控、促组织修复五大功能一体化。

该微针利用ZTCG的类酶活性与ROS响应释药能力,解决糖尿病创面氧化应激、耐药菌感染、免疫紊乱三大核心问题;依靠Ce-MOF的HO比色响应特性,实现创面状态可视化监测,让传统“盲治”转变为精准化治疗。

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  1. CONNECT:[ UseTime:0.000810s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001386s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001482s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009058s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000783s ]
  6. SELECT * FROM `set` [ RunTime:0.017525s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001686s ]
  8. SELECT * FROM `article` WHERE `id` = 539673 LIMIT 1 [ RunTime:0.031887s ]
  9. UPDATE `article` SET `lasttime` = 1784236343 WHERE `id` = 539673 [ RunTime:0.003336s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001892s ]
  11. SELECT * FROM `article` WHERE `id` < 539673 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.011578s ]
  12. SELECT * FROM `article` WHERE `id` > 539673 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.017112s ]
  13. SELECT * FROM `article` WHERE `id` < 539673 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.052870s ]
  14. SELECT * FROM `article` WHERE `id` < 539673 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.038784s ]
  15. SELECT * FROM `article` WHERE `id` < 539673 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.034601s ]
0.420991s