当前位置:首页>南京>南京中医药大学青年基金结题,巨噬细胞 EIMP 障碍揭秘 BHD 综合征肺大疱机制 葛根素有望填补临床治疗空白

南京中医药大学青年基金结题,巨噬细胞 EIMP 障碍揭秘 BHD 综合征肺大疱机制 葛根素有望填补临床治疗空白

  • 2026-02-07 18:07:39
南京中医药大学青年基金结题,巨噬细胞 EIMP 障碍揭秘 BHD 综合征肺大疱机制 葛根素有望填补临床治疗空白

导读

国家自然科学基金结题报告

Birt-Hogg-Dubé 综合征(BHDS)是由 FLCN 基因突变引发的罕见病,肺大疱及反复气胸是东亚患者最常见的表型,目前缺乏针对性治疗药物,临床主要依赖外科手术。南京中医药大学闵海燕教授团队牵头的国家自然科学基金青年项目(批准号:82101949),首次阐明肺组织巨噬细胞胞葬诱导的巨噬细胞增殖(EIMP)障碍是 BHDS 肺大疱 “灶性” 形成的关键机制,证实 FLCN 调控的 miR-424-5p 和 let-7d-5p 通过靶向抑制 Rictor,阻断 mTORC2-Myc 通路,导致巨噬细胞修复功能受损。项目成功构建 BHDS 样肺大疱小鼠模型,发现葛根素可逆转 EIMP 障碍,为临床治疗提供了新靶点与潜在药物,相关成果已形成多篇论文投稿,培养博士、硕士研究生 3 名。

研 究 背 景 

BHDS 是一种常染色体显性遗传罕见病,核心临床特征包括皮肤纤维毛囊瘤、肾肿瘤及肺大疱 / 气胸,其中肺损伤在我国及东亚患者中发生率最高,严重影响患者生活质量且易反复复发。FLCN 基因作为 BHDS 的致病基因,其功能研究此前多集中于增生性病理(如肾肿瘤)的蛋白相互作用机制,而对肺大疱这一退行性病理的调控机制尚不明确。

团队前期研究发现,FLCN 通过负调控 miR-424-5p 和 let-7d-5p,分别靶向肺上皮细胞 TGF-β 通路和间充质细胞 WNT 通路,抑制肺组织损伤修复反应,导致上皮细胞凋亡增加,这是肺大疱形成的基础。但 BHDS 肺大疱 “灶性” 分布的核心病理特征机制仍未阐明。进一步研究发现,BHDS 样小鼠模型中巨噬细胞标记显著富集,吞噬功能相关基因表达改变,提示巨噬细胞功能异常可能是肺大疱 “灶性” 形成的关键推手。基于此,项目提出核心假说:FLCN-miRNAs 介导的巨噬细胞 EIMP 障碍,是 BHDS 肺大疱形成的充分条件,为解析疾病机制及开发治疗药物提供了新方向。

内 容 简 介

构建 BHDS 样肺大疱小鼠模型,明确巨噬细胞的关键作用

团队创新采用 “HCl 轻度肺损伤 + FLCN-miRNAs 导入” 策略,成功构建 BHDS 样肺大疱小鼠模型,其肺组织病理特征与临床 BHDS 患者高度一致。通过巨噬细胞清除实验验证:清除小鼠肺组织巨噬细胞后,肺组织结构稳态失衡;重新回输正常巨噬细胞,肺组织致密性恢复;而回输经 FLCN-miRNAs 预处理的巨噬细胞,则可再次诱导出 “灶性” 肺大疱病理。

进一步检测显示,模型小鼠肺组织中损伤修复关键因子 α-SMA 表达显著降低,细胞凋亡标志物 cleaved caspase3 表达显著升高,与临床患者肺组织分子特征一致,证实受 FLCN-miRNAs 调控的巨噬细胞是 BHDS 肺大疱 “灶性” 形成的必需条件。

转录组测序揭示核心机制:巨噬细胞 EIMP 过程受阻

对模型小鼠肺组织及巨噬细胞株(RAW264.7、MH-S)进行转录组测序,发现唯一显著富集的生物学过程为 “吞噬体(phagosome)”。深入研究证实,FLCN-miRNAs 处理后的巨噬细胞,胞葬作用(清除凋亡细胞的关键过程)显著激活,但胞葬诱导的巨噬细胞增殖(EIMP)过程存在严重障碍 —— 巨噬细胞虽能有效清除凋亡的肺上皮细胞,但其自身增殖能力下降,甚至出现数量减少。

EIMP 是巨噬细胞促进组织修复的核心生物学过程,增殖后的巨噬细胞可分泌 TGF-β、IL-10 等修复因子。项目检测发现,模型小鼠肺组织及 miRNAs 处理后的巨噬细胞中,TGF-β、IL-10 及核心转录因子 Myc 的表达均显著降低,证实 EIMP 障碍导致肺组织损伤修复信号不足,最终形成 “灶性” 肺大疱。

FLCN-miRNAs 靶向 Rictor,阻断 mTORC2-Myc 通路

通过生物信息学分析及分子验证,团队明确 FLCN 调控的 miR-424-5p 和 let-7d-5p 均可直接靶向 mTORC2 复合物的核心组成成分 Rictor。Western blot 及荧光素酶实验证实,两种 miRNAs 均能显著抑制 Rictor 的 mRNA 及蛋白表达,进而阻断 mTORC2-Myc 信号通路 —— 该通路是 EIMP 过程的关键调控轴,其受阻直接导致巨噬细胞增殖障碍,无法产生足量修复因子。

这一机制在临床 BHDS 患者肺组织样本中得到验证:患者肺组织中 CD163(抗炎巨噬细胞标志物)、LAMP2(胞葬作用标志物)表达升高,而 Myc(EIMP 关键因子)表达降低,与小鼠模型的分子特征完全一致,证实了机制的临床相关性。

葛根素有望逆转 EIMP 障碍,成为潜在治疗药物

基于前期研究发现葛根素具有增强巨噬细胞抗炎特性的作用,团队开展了靶向 EIMP 障碍的药物干预探索。体外实验显示,在 LPS 刺激的巨噬细胞模型中,FLCN-miRNAs 处理可导致巨噬细胞增殖抑制,而葛根素干预后,巨噬细胞表现出明显的凋亡抵抗,48 小时细胞数量显著高于单纯 miRNAs 处理组,证实葛根素可逆转 FLCN-miRNAs 介导的 EIMP 障碍。

进一步在 BHDS 样肺大疱小鼠模型中设置葛根素治疗组,通过活体 CT 检测发现,葛根素可改善小鼠肺部影像学特征,相关组织学及分子生物学验证实验正在进行中,有望为 BHDS 肺大疱提供首个针对性治疗药物。

结 论 

本研究首次揭示了巨噬细胞 EIMP 障碍在 BHDS 肺大疱 “灶性” 形成中的核心作用,明确了 FLCN-miRNAs→Rictor→mTORC2-Myc 通路是调控这一过程的关键分子轴,填补了 BHDS 退行性肺病理机制的研究空白。

项目的创新价值在于:成功构建了与临床特征一致的 BHDS 样肺大疱小鼠模型,为机制研究提供了关键工具;首次将巨噬细胞 EIMP 过程与罕见病肺损伤关联,拓展了巨噬细胞功能调控的疾病谱;发现葛根素可逆转 EIMP 障碍,为临床治疗提供了潜在药物,有望填补 BHDS 肺大疱无针对性药物的临床空白。

展示仅供学习使用!

本文中使用的图片来国家自然科学基金结题报告,因客观原因未能与权利人取得联系。本平台出于学术交流目的引用,无意侵犯原作者权益。如权利人认为不妥,请及时联系公众号后台,我们将立即删除或协商解决。

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  1. CONNECT:[ UseTime:0.000456s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000781s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001595s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000472s ]
  6. SELECT * FROM `set` [ RunTime:0.000631s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000501s ]
  8. SELECT * FROM `article` WHERE `id` = 479619 LIMIT 1 [ RunTime:0.003377s ]
  9. UPDATE `article` SET `lasttime` = 1770467469 WHERE `id` = 479619 [ RunTime:0.006547s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.004115s ]
  11. SELECT * FROM `article` WHERE `id` < 479619 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000716s ]
  12. SELECT * FROM `article` WHERE `id` > 479619 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000483s ]
  13. SELECT * FROM `article` WHERE `id` < 479619 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008199s ]
  14. SELECT * FROM `article` WHERE `id` < 479619 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013521s ]
  15. SELECT * FROM `article` WHERE `id` < 479619 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014815s ]
0.127244s