当前位置:首页>南京>【最新收录】澳门科技大学副校长姜志宏/南京医科大学第一附属医院联合发表最新成果

【最新收录】澳门科技大学副校长姜志宏/南京医科大学第一附属医院联合发表最新成果

  • 2026-04-10 03:49:00
【最新收录】澳门科技大学副校长姜志宏/南京医科大学第一附属医院联合发表最新成果

📖 研究背景与核心概览

支气管哮喘的治疗长期面临一个严峻的科学痛点:气道重塑(Airway Remodeling)。这一病理过程(包括平滑肌增生、上皮间质转化和胶原沉积)不仅是导致患者肺功能进行性下降的元凶,更是引发传统药物(如糖皮质激素)治疗抵抗的核心驱动力。目前,临床上极度缺乏能够直接逆转气道重塑的靶向药物。药用植物银杏叶(Ginkgo biloba)自古便有润肺平喘之效,但其蕴含的植物源小核酸(tRNA衍生片段,tRFs)是否能在慢性气道疾病中发挥跨物种的基因调控作用,一直是一个引人入胜的未解之谜。

近期,南京医科大学第一附属医院黄茂/马媛团队联合澳门科技大学姜志宏团队,在国际植物药理学权威期刊 Phytomedicine 上发表了题为“A Ginkgo biloba-derived tRNA-derived fragment attenuates asthma by restoring airway structural cell homeostasis via mitochondrial regulation”(DOI: 10.1016/j.phymed.2026.158067)的重磅研究。该研究巧妙融合了多组学测序、原创中药核酸数据库与纳米递送技术,首次证实银杏叶特异性tRF(tRF_G6)能够精准靶向宿主致病基因PMEPA1,通过修复线粒体稳态,强效阻断哮喘气道重塑的恶性循环。

🔍 研究结果深度拆解

多维转录组学测序:精准锁定气道重塑的“幕后推手”

PMEPA1 研究团队并未盲目开展细胞实验,而是从真实的临床痛点出发。通过对哮喘患者外周血单核细胞(PBMCs)进行深度RNA-seq测序,并联合多个GEO公共数据库(如GSE64913、GSE41861等)进行大样本比对,研究者锁定了一个异常高表达的核心致病基因——前列腺跨膜蛋白雄激素诱导1(PMEPA1)。临床相关性分析(ROC与Spearman相关性)清晰地显示,PMEPA1的表达水平与哮喘的严重程度及肺功能(FEV1/FVC)下降呈显著负相关,提示其在气道重塑中扮演着关键角色。

体外表型确证:PMEPA1驱动气道结构细胞的病理转化 

为了探究PMEPA1的具体功能,研究者构建了TGF-β1刺激的支气管上皮细胞(BECs)和气道平滑肌细胞(ASMCs)体外模型。通过CCK8、EdU增殖实验以及细胞划痕(Wound healing)测试,观察到高表达的PMEPA1极大地促进了ASMCs的过度增殖与细胞外基质(ECM)分泌,同时加速了BECs的上皮间质转化(EMT,表现为E-cadherin下降与N-cadherin升高)。这证实了PMEPA1是驱动气道结构细胞向病理表型转化的核心引擎。

深层机制解析:PMEPA1诱导线粒体功能障碍与自噬失调

细胞表型的崩溃往往源于能量工厂的失控。借助透射电镜(TEM)与生化检测,研究团队深入细胞微观世界,发现PMEPA1的过表达引发了严重的线粒体损伤,导致活性氧(ROS)大量蓄积。更为致命的是,PMEPA1扰乱了细胞的**线粒体自噬(Mitophagy)**进程,使得受损的线粒体无法被及时清除,这种持续的细胞内应激(DAMPs释放)最终锁死了气道重塑的恶性循环。

中药小核酸的发现:银杏叶源 tRF_G6 的精准靶向预测

找到了治疗靶点,如何实施精准打击?依托团队前期构建的原创“中药tsRNA数据库”,研究者运用miRanda与RNAhybrid等生物信息学工具,对银杏叶提取物中的小核酸序列进行了高通量筛选。基于最小自由能(MFE)和靶向结合评分,他们成功鉴定出一条特异性的银杏叶tRNA衍生片段——NO.6-tRF-5-1(简称 tRF_G6)。序列比对显示,tRF_G6能够完美互补结合于人类与小鼠PMEPA1基因的3'-UTR区域。

体外拯救实验:tRF_G6 强效逆转线粒体损伤与细胞重塑 

为了验证这一跨物种调控的奇妙设想,研究者将合成的 tRF_G6 模拟物(mimics)转染至TGF-β1刺激的BECs和ASMCs中。Western blot与qPCR结果令人振奋:tRF_G6 极其精准地沉默了PMEPA1的表达。伴随靶点的抑制,细胞内的线粒体形态得以恢复,ROS水平显著下降,异常的自噬流重新畅通,气道细胞的异常增殖与EMT进程被彻底踩下“刹车”。

体内药效与转化:纳米递送 tRF_G6 显著改善小鼠哮喘表型 

在最终的活体动物实验中,团队构建了屋尘螨(HDM)诱导的慢性哮喘小鼠模型。为了克服裸RNA在体内容易降解的难题,研究者创新性地采用了**组氨酸-赖氨酸聚合物(HKP)**纳米递送系统,将 tRF_G6 包装成纳米颗粒(HKP-tRF_G6)进行鼻腔滴注。组织学染色(H&E、PAS、Masson)与ELISA检测显示,该纳米药物不仅大幅降低了小鼠肺泡灌洗液中的炎症因子(IL-4、IL-13)与IgE水平,更显著减少了气道壁增厚、胶原沉积和杯状细胞增生,展现出媲美甚至超越传统地塞米松(DEX)的抗重塑疗效。

💡 总结与启发

本研究以极其严密的逻辑链条,揭示了银杏叶源小核酸通过靶向宿主PMEPA1-线粒体轴来逆转哮喘气道重塑的全新机制。这项工作为未来的医学研究带来了深刻的启发:

  1. 跨物种基因调控的无限可能:研究打破了传统中药“小分子化合物”的单一认知框架,证实了植物源tRFs(小核酸)能够作为一种天然的“基因沉默剂”在哺乳动物体内发挥治疗作用,这为中药药效物质基础的解析开辟了革命性的新维度。

  2. 气道重塑治疗靶点的范式转移:首次将PMEPA1及其介导的线粒体自噬失调引入哮喘气道重塑的病理图谱中。这提示我们,干预慢性气道疾病不应仅仅局限于抗炎,恢复结构细胞的线粒体代谢稳态可能是一条更为根本的破局之路。

  3. 天然核酸药物的临床转化潜力:结合HKP纳米聚合物进行呼吸道局部递送(鼻腔滴注),完美解决了核酸药物成药性差、靶向性弱的痛点,为开发安全、高效的吸入式靶向核酸新药提供了极具临床转化价值的参考模板。

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  1. CONNECT:[ UseTime:0.000515s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000726s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000292s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000424s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000501s ]
  8. SELECT * FROM `article` WHERE `id` = 524132 LIMIT 1 [ RunTime:0.002355s ]
  9. UPDATE `article` SET `lasttime` = 1776379229 WHERE `id` = 524132 [ RunTime:0.007306s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000247s ]
  11. SELECT * FROM `article` WHERE `id` < 524132 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000359s ]
  12. SELECT * FROM `article` WHERE `id` > 524132 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000393s ]
  13. SELECT * FROM `article` WHERE `id` < 524132 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003082s ]
  14. SELECT * FROM `article` WHERE `id` < 524132 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000742s ]
  15. SELECT * FROM `article` WHERE `id` < 524132 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000772s ]
0.090755s