当前位置:首页>南京>南京大学医学院附属金陵医院丨人参皂苷 Rg1:通过 Prdx1–PTEN/PI3K/AKT 通路调控自噬,改善脓毒症相关 ARDS

南京大学医学院附属金陵医院丨人参皂苷 Rg1:通过 Prdx1–PTEN/PI3K/AKT 通路调控自噬,改善脓毒症相关 ARDS

  • 2026-05-27 08:59:08
南京大学医学院附属金陵医院丨人参皂苷 Rg1:通过 Prdx1–PTEN/PI3K/AKT 通路调控自噬,改善脓毒症相关 ARDS

本研究以脓毒症相关急性呼吸窘迫综合征(ARDS)高病死率、治疗靶点不明为切入点,采用小鼠盲肠结扎穿孔(CLP)构建体内脓毒症模型、LPS 刺激小鼠肺泡上皮 MLE-12 细胞构建体外模型,结合 Prdx1 基因敲除 / 过表达、PTEN 敲除等基因干预手段,通过分子对接、Co-IP、Western blot、自噬流检测等技术,探究人参皂苷 Rg1 的保护作用及机制;结果显示 Rg1 可上调 Prdx1 表达,增强 Prdx1 与 PTEN 的相互作用,抑制 PI3K/AKT/mTOR 通路活化,进而促进细胞自噬,降低凋亡、炎症反应与氧化应激水平,最终减轻肺组织损伤、提高模型动物生存率,提示 Rg1 可通过 Prdx1–PTEN/PI3K/AKT 通路促进自噬发挥保护作用,为脓毒症相关 ARDS 提供潜在治疗药物与靶点。

研究设计

构建 CLP 诱导的小鼠脓毒症 ARDS 模型与 LPS 诱导的 MLE-12 细胞损伤模型,设置不同剂量 Rg1 干预组、Prdx1/PTEN 基因敲除 / 过表达组、通路激活 / 抑制剂组,通过检测肺组织病理、肺干湿重比、呼吸功能、炎症因子、氧化应激指标、凋亡与自噬相关蛋白,结合 Co-IP、分子对接、RNA-seq 等技术,明确 Rg1 对脓毒症肺损伤的保护作用,阐明 Rg1 通过调控 Prdx1-PTEN 相互作用、抑制 PI3K/AKT 通路、促进自噬发挥保护效应的分子机制。

研究结果

Rg1 可显著提高 CLP 模型小鼠生存率,改善肺功能、减轻肺水肿与病理损伤,降低炎症因子、氧化应激水平与细胞凋亡,同时以剂量依赖方式促进肺组织与 MLE-12 细胞自噬;RNA-seq 筛选发现 Prdx1 是关键靶点,Rg1 可上调 Prdx1 表达,增强 Prdx1 与 PTEN 的结合,抑制 PI3K/AKT/mTOR 通路活化;敲除 Prdx1 或 PTEN 会逆转 Rg1 的自噬促进与肺保护作用,过表达 Prdx1 可模拟 Rg1 的保护效应,通路激活剂可抵消 Prdx1 过表达的作用,通路抑制剂可逆转 Prdx1 敲除的损伤效应,Prdx1 特异性敲除小鼠体内实验进一步验证该通路的必要性。

Figure 1:证实 Rg1 可改善 CLP 小鼠脓毒症 ARDS,提高生存率、改善肺功能、减轻炎症 / 氧化应激 / 凋亡并促进自噬,且呈剂量依赖性,与地塞米松疗效相当。

Figure 2:在 LPS 诱导的 MLE-12 细胞中,Rg1 可抑制氧化应激、炎症与凋亡,促进自噬,自噬抑制剂会抵消 Rg1 的保护作用,证明 Rg1 通过自噬发挥效应。

Figure 3:RNA-seq 确定 Prdx1 为 Rg1 作用靶点,Rg1 通过上调 Prdx1 促进自噬、减轻损伤,敲除 Prdx1 可逆转 Rg1 的保护作用。

Figure 4:Rg1 可增强 Prdx1 与 PTEN 的相互作用,明确二者结合结构域,PTEN 敲除会削弱 Rg1 的自噬促进作用,证实 Prdx1-PTEN 互作的关键作用。

Figure 5:Prdx1-PTEN 互作通过抑制 PI3K/AKT/mTOR 通路促进自噬,通路干预实验验证该通路是 Rg1 发挥作用的关键下游通路。

Figure 6:在 Prdx1 条件敲除小鼠体内,Rg1 的肺保护、促自噬、抑凋亡 / 炎症 / 氧化应激作用被显著逆转,体内验证 Prdx1 的必要性。

Figure 7:免疫组化与免疫荧光进一步证实 Rg1 通过 Prdx1 调控 PI3K/AKT 通路、促进自噬、抑制凋亡,增强 Prdx1 与 PTEN 的共定位。

Figure 8:直观展示 Rg1 的作用机制模式图,即 Rg1→上调 Prdx1→增强 Prdx1-PTEN 互作→抑制 PI3K/AKT→促进自噬→减轻 ARDS。

研究结论

本研究首次证实 Rg1 可通过上调 Prdx1、增强 Prdx1-PTEN 相互作用,抑制 PI3K/AKT/mTOR 通路以促进自噬,进而减轻脓毒症相关 ARDS 的炎症、氧化应激与凋亡,实现肺保护,明确 Prdx1-PTEN 为关键调控靶点,为 Rg1 临床转化与 ARDS 治疗提供新依据;但研究存在局限性,仅采用 MLE-12 细胞与 CLP 小鼠单一模型,未纳入人肺组织样本与多种细胞类型,未探究 Rg1 调控 Prdx1 的上游机制,也未系统评估 Rg1 的脱靶效应与临床安全性,后续需补充人体样本、多模型验证及上游机制与安全性研究。

本文中使的图片来源于Pubmed,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:0.000592s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000719s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000544s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000570s ]
  8. SELECT * FROM `article` WHERE `id` = 569722 LIMIT 1 [ RunTime:0.000441s ]
  9. UPDATE `article` SET `lasttime` = 1780419607 WHERE `id` = 569722 [ RunTime:0.005956s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000286s ]
  11. SELECT * FROM `article` WHERE `id` < 569722 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000449s ]
  12. SELECT * FROM `article` WHERE `id` > 569722 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005236s ]
  13. SELECT * FROM `article` WHERE `id` < 569722 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000798s ]
  14. SELECT * FROM `article` WHERE `id` < 569722 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002956s ]
  15. SELECT * FROM `article` WHERE `id` < 569722 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002913s ]
0.092775s