当前位置:首页>东莞>【最新收录】1区top!广州中医药大学刘中秋&王彩艳团队发现连翘酯苷E能显著缓解脓毒症导致的肝损伤!虚拟筛选立大功

【最新收录】1区top!广州中医药大学刘中秋&王彩艳团队发现连翘酯苷E能显著缓解脓毒症导致的肝损伤!虚拟筛选立大功

  • 2026-03-24 14:10:58
【最新收录】1区top!广州中医药大学刘中秋&王彩艳团队发现连翘酯苷E能显著缓解脓毒症导致的肝损伤!虚拟筛选立大功

研究背景:脓毒症诱导的肝损伤预后极差,现有治疗效果有限。近期,广州中医药大学团队发表在《Advanced Science》(IF>14)上的重磅研究揭示:连翘提取物中的核心活性成分连翘酯苷E(FE),通过靶向丙酮酸激酶 M2(PKM2)的K311位点促进其四聚化,同时驱动巨噬细胞代谢重编程与STAT3/NLRP3信号通路抑制,推动巨噬细胞向抗炎M2表型极化,显著缓解脓毒症诱导的肝损伤,且无多器官毒性,为脓毒症肝损伤治疗提供了全新的代谢-表观遗传协同调控策略。

速览:这篇研究其创新点在于通过高通量虚拟筛选技术次发现FE是PKM2四聚化的新型变构激动剂,通过 “代谢重编程(抑制糖酵解 + 恢复线粒体功能)+ 表观遗传调控(阻断 STAT3/NLRP3)” 双机制,精准调控巨噬细胞极化。研究从靶点鉴定、分子机制、细胞验证到动物实验,形成完整证据链,且 FE 来源天然、安全性高,为脓毒症相关肝损伤提供了兼具科学深度与临床转化潜力的新策略。

一、先证靶点:PKM2是脓毒症肝损伤

的关键分子

通过 GEO 数据库分析与动物模型验证,明确 PKM2 的核心作用:

  • 临床相关性:GSE57065 数据集显示,脓毒症患者 PKM2 基因表达显著高于健康人;GSE166488 数据集证实,脓毒症小鼠肝脏中 PKM2 高表达,且富集糖酵解、HIF-1α 等通路;

  • 巨噬细胞关联:脓毒症小鼠肝脏中巨噬细胞浸润显著增加,且与 PKM2 mRNA 表达呈正相关;脓毒症小鼠巨噬细胞中,TNF、NF-κB 等炎症通路基因上调,而髓系特异性 PKM2 敲除后,这些炎症通路基因显著下调,证实 PKM2 调控巨噬细胞炎症反应;

  • 表型特征:脓毒症小鼠肝脏中 M1 巨噬细胞数量显著多于 M2 巨噬细胞,提示巨噬细胞 M1 极化是肝损伤的重要驱动因素。

二、筛选验证:FE 是 PKM2

四聚化的潜在激动剂

1. 高通量虚拟筛选

  • 筛选策略:以 PKM2 激动剂结合位点为靶点,从 3 万余种小分子中筛选,结合对接分数、蛋白 - 配体相互作用指纹分析,筛选出 4 个候选化合物,其中 FE 对接分数最高(-12.96);

  • 分子对接特征:FE 能稳定结合 PKM2 的激动剂结合位点,通过氢键与蛋白形成相互作用,且结构多样性符合活性化合物特征。

2. FE的初步活性验证

  • 低细胞毒性:在 RAW264.7 巨噬细胞中,FE 的细胞毒性显著低于其他候选化合物,安全性更优;

  • 促进 PKM2 四聚化:DSS 交联实验显示,FE 能有效促进 PKM2 四聚体形成,效果优于其他候选化合物,且呈剂量依赖性;

  • 调控巨噬细胞极化:FE 显著下调 LPS 诱导的 M1 标志物(CD86、TNF-α、IL-1β)的 mRNA 和蛋白表达,上调 M2 标志物(CD206、IL-10、Arg1),减少 PKM2 核定位,抑制其促炎功能;

  • 细胞特异性:FE 仅在 RAW264.7 巨噬细胞中促进 PKM2 四聚化,在 LX2(肝星状细胞)、WRL68(肝细胞)中无显著效果,提示作用具有细胞特异性。

三、靶点锁定:FE 直接结合

PKM2 K311位点,促进四聚化

通过高通量虚拟筛选与多技术验证,明确 FE 的核心作用靶点:

  • 靶点鉴定:从 3 万余种小分子中筛选出 FE,经 pull-down、CETSA、SPR 等实验证实,FE 与 PKM2 直接结合,结合亲和力达 277 nM;

  • 关键位点:分子对接与突变体实验显示,FE 特异性结合 PKM2 的 K311 位点,该位点在多物种中高度保守;K311A 突变后,FE 无法增强 PKM2 热稳定性,也不能促进其四聚化,证实该位点是结合必需;

  • 聚合形式调控:FE 剂量依赖性促进 PKM2 四聚体形成,减少二聚体比例,降低 PKM2 核定位,抑制其蛋白激酶功能。

四、代谢重编程:抑制糖酵解

恢复线粒体功能

FE通过 PKM2 四聚化重塑巨噬细胞代谢模式:

  • 抑制糖酵解:FE 显著降低 LPS 诱导的巨噬细胞乳酸分泌和糖酵解关键基因(LDHA、Glut1、HK2)表达, Seahorse 分析显示胞外酸化率(ECAR)下降,基础糖酵解和补偿性糖酵解均受抑制;

  • 修复线粒体功能:提升线粒体耗氧率(OCR),恢复最大呼吸能力;改善 LPS 诱导的线粒体膜电位下降和网络碎片化,恢复管状线粒体结构,增强氧化磷酸化。

五、信号通路调控:阻断 STAT3/NLRP3,抑制炎症反应

FE通过抑制 PKM2 与 STAT3 相互作用,阻断下游炎症通路:

  • 抑制 STAT3 激活:LPS 诱导 PKM2 与 STAT3 结合并促进其磷酸化(p-STAT3),FE 显著减弱二者相互作用,减少 p-STAT3 的核定位;

  • 下调 NLRP3 转录:转录组测序显示 FE 富集 NOD 样受体通路,显著降低 LPS 诱导的 NLRP3 基因和蛋白表达,减少炎症因子(iNOS、TNF-α、IL-1β)释放;

  • 机制协同:PKM2 四聚化抑制其蛋白激酶功能,间接阻断 STAT3 磷酸化,进而抑制 NLRP3 转录,形成 “代谢重编程 - 炎症抑制” 协同效应。

六、体内外验证:显著缓解脓毒症肝损伤

1. 细胞层面

  • 推动巨噬细胞极化:FE 显著下调 M1 标志物(CD86、TNF-α、IL-1β),上调 M2 标志物(CD206、IL-10、Arg1),促进 M2 表型转化;

  • 特异性依赖 PKM2:在 PKM2 K311A 突变的巨噬细胞中,FE 无法发挥抗炎和极化调控作用。

2. 动物层面

  • 脓毒症模型(CLP)验证:FE 高剂量(80 mg/kg)显著改善小鼠肝组织外观(从暗褐色恢复为红褐色),减轻肝细胞肿胀、核固缩等病理损伤,降低血清 ALT、AST 水平;

  • 机制一致性:小鼠肝组织中,FE 显著减少 CD86+ M1 巨噬细胞浸润,增加 CD206+ M2 巨噬细胞比例,下调 NLRP3、p-STAT3 及炎症因子表达,提升 PKM2 四聚体水平;

  • 突变体验证:巨噬细胞特异性过表达 PKM2 K311A 的小鼠中,FE 的肝保护作用完全消失,证实 PKM2 K311 是 FE 作用的关键靶点。

七、安全性保障:体内分布稳定

无多器官毒性

  • 原型分布:LC-MS/MS 检测显示,FE 以原型形式存在于小鼠血清和肝组织中,确保靶向作用效率;

  • 低毒性:高剂量 FE 处理后,小鼠肝、肾、心、胰腺等多器官无明显损伤,器官功能标志物(如尿素、肌酸激酶、淀粉酶)无显著异常,HE 染色未发现组织病理改变。

原文链接:DOI: 10.1002/advs.202514514

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  1. CONNECT:[ UseTime:0.000562s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000784s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000288s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000475s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000623s ]
  8. SELECT * FROM `article` WHERE `id` = 459939 LIMIT 1 [ RunTime:0.000469s ]
  9. UPDATE `article` SET `lasttime` = 1774532422 WHERE `id` = 459939 [ RunTime:0.003027s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000234s ]
  11. SELECT * FROM `article` WHERE `id` < 459939 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000387s ]
  12. SELECT * FROM `article` WHERE `id` > 459939 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001268s ]
  13. SELECT * FROM `article` WHERE `id` < 459939 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001574s ]
  14. SELECT * FROM `article` WHERE `id` < 459939 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001197s ]
  15. SELECT * FROM `article` WHERE `id` < 459939 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000639s ]
0.080212s