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IF18!南京医科大博士'国自然'登双一区TOP!

  • 2026-07-17 06:20:52
IF18!南京医科大博士'国自然'登双一区TOP!
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高血压内皮保护存在经典理论盲区:甘氨酸受体GLRA2长期被视作专属神经的氯离子通道,南京医科大学国自然成果证实:动脉内皮存在功能性GLRA2,不靠氯通道、仅通过GSK3β-AKT-eNOS通路驱动NO释放;高血压患者血浆甘氨酸大幅衰减,直接切断这条天然降压通路

○ 新定位:首次证实大动脉内皮特异性表达GLRA2,解锁血管全新代谢受体;

○ 新机制:颠覆受体功能认知,GLRA2仅作为蛋白支架启动内皮舒张信号;

○ 新转化:甘氨酸、亚精胺两种内源物质,上下游双靶点修复血管、降低血压。

PART 01
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核心创新

首次发现动脉内皮表达甘氨酸受体α2(GLRA2),该受体不依赖氯离子通道,通过GSK3β Ser9磷酸化激活AKT/eNOS通路促进NO合成、舒张血管、降低血压;天然小分子亚精胺可靶向GSK3发挥降压作用,为高血压提供全新内皮治疗靶点。

核心机制通路

通路 1:甘氨酸上游通路(内皮GLRA2依赖)

循环甘氨酸 → 结合动脉内皮GLRA2(不激活氯离子通道)→ GLRA2与GSK3β结合 → GSK3β发生Ser9磷酸化 → 解除GSK3β对AKT的抑制 → AKT磷酸化eNOS Ser1177 → eNOS活化、大量NO释放 → 血管舒张、降低血压、抑制内皮炎症氧化损伤。

通路 2:亚精胺下游通路(绕过GLRA2,直接靶向GSK3β)

亚精胺直接结合GSK3β → 促进GSK3β Ser9磷酸化 → 激活AKT/eNOS-NO轴,独立于GLRA2发挥降压作用。

研究

方法

人体临床队列验证

116例原发性高血压患者+124例血压正常对照,检测血浆甘氨酸,分析甘氨酸与收缩压/舒张压相关性。采集人主动脉内皮样本,免疫荧光证实人体血管内皮存在GLRA2表达,从人群层面建立甘氨酸、GLRA2与高血压的关联证据。

多层次基因编辑动物实验
构建内皮特异性GLRA2、GSK3β敲除小鼠,搭配AAV病毒回补、骨髓移植排除造血细胞干扰;构建Ang II、DOCA-盐高血压模型,通过动态血压监测、血管环舒张、内皮转录组测序,明确GLRA2调控血管张力与血压的体内因果作用。
体外分子机制与天然活性物筛选

采用人脐静脉内皮、小鼠原代主动脉内皮细胞,借助Co-IP、膜片钳、位点突变等技术阐明GLRA2不依赖氯离子通道的信号传导机制;依托分子对接筛选亚精胺,结合细胞、动物给药验证其靶向GSK3β、改善内皮功能、降低血压的药理作用。

PART 02
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Result 01.
动脉内皮特异性高表达GLRA2,甘氨酸经转录因子ZNF384上调其表达

借助RT-qPCR、WB、内皮特异性荧光标记、双荧光素酶报告实验验证:GLRA2在主动脉、肠系膜动脉内皮丰度高于脑组织,血管平滑肌无表达;长期甘氨酸刺激通过结合GLRA2启动子ZNF384结合区段,显著提升内皮GLRA2蛋白水平。(图 1)

图 1.GLRA2(甘氨酸受体的 α2 亚基)在内皮细胞中的表达

亮点:多组织平行定位+转录因子互作验证,清晰阐明配体调控受体表达的上游环路。

Result 02.
人群血浆甘氨酸水平与血压负相关,内皮GLRA2是甘氨酸降压的必需靶点

依托人群血浆代谢检测、小鼠动态血压遥测、内皮特异性敲除/AAV回补模型验证:高血压患者血浆甘氨酸较健康人下降37.9%;甘氨酸仅在多种高血压模型中降压,敲除内皮GLRA2后该保护效应完全消失,回补GLRA2可表型挽救。(图 2)

图 2 .甘氨酸(Gly)可拮抗小鼠的高血压症状

亮点:临床队列先行提出假说,基因敲除+病毒回补双向锁定内皮GLRA2为降压核心靶点。

Result 03.
GLRA2依靠提升内皮NO合成维持血管舒张,作用完全独立于氯离子通道
采用NO代谢物定量、血管环功能、膜片钳、通道阻断剂干预实验证实:GLRA2缺失基础NO分泌显著下降;甘氨酸促舒张、降血压效应不受氯通道抑制剂士的宁、胞外氯离子浓度干扰,仅超高浓度甘氨酸才可诱发微弱内皮氯电流。(图 3)

图 3.GLRA2(甘氨酸受体的α2亚基)是维持甘氨酸(Gly)对内皮功能障碍保护作用所必需的

亮点:多重正交实验区分受体通道/支架双功能,推翻教科书传统认知,为本研究核心原创证据。

Result 04.
GLRA2结合GSK3β诱导Ser9磷酸化,激活下游AKT/eNOS信号轴

通过Co-IP蛋白互作、荧光共定位、GSK3β位点突变体系验证:GLRA2与GSK3β稳定结合;GSK3β Ser9磷酸化是AKT、eNOS活化的必要条件,该过程不依赖GSK3β自身激酶催化活性。(图 4)

图 4.GSK3β(糖原合成酶激酶 3β)是甘氨酸/GLRA2(甘氨酸受体的 α2 亚基)诱导 AKT 和eNOS(内皮型一氧化氮合酶)磷酸化所必需的

亮点:蛋白互作结合功能突变,精准拆解GSK3β支架信号传导精细分子机制。

Result 05.
天然小分子亚精胺靶向GSK3β Ser9位点,实现不依赖GLRA2的内皮保护降压
运用分子对接、细胞siRNA敲低、动物口服给药、内皮GSK3β敲除模型证明:亚精胺可特异性促进GSK3β Ser9磷酸化,激活AKT/eNOS通路、升高NO,修复高血压血管舒张损伤,药效不受GLRA2缺失影响。(图 5)

图 5.亚精胺(SPD)可影响 GSK3β(糖原合成酶激酶 3β)Ser9位点的磷酸化,并能预防血管紧张素II(AngII)引起的高血压及内皮功能障碍

亮点:机制明确后反向筛选天然活性物质,完成细胞-动物两级药效验证,搭建完整转化研究链条。

PART 03
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本研究结合临床人群、基因编辑动物、细胞分子证实动脉内皮GLRA2是甘氨酸降压的核心功能性靶点;该受体独立于经典氯离子通道功能,通过GSK3β Ser9磷酸化激活AKT/eNOS-NO舒张通路;同时筛选出天然小分子亚精胺可直接靶向GSK3β发挥内皮保护、降压作用。该成果拓展了甘氨酸受体生理功能边界,为高血压内皮损伤机制提供全新理论,同时提供可落地的膳食/药物转化思路。

声明:本文仅为个人文献学习解读,如有解读疏漏,敬请谅解。

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  1. CONNECT:[ UseTime:0.001170s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002086s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000794s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000753s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001576s ]
  6. SELECT * FROM `set` [ RunTime:0.000615s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001860s ]
  8. SELECT * FROM `article` WHERE `id` = 596573 LIMIT 1 [ RunTime:0.001634s ]
  9. UPDATE `article` SET `lasttime` = 1784457853 WHERE `id` = 596573 [ RunTime:0.010843s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000710s ]
  11. SELECT * FROM `article` WHERE `id` < 596573 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001176s ]
  12. SELECT * FROM `article` WHERE `id` > 596573 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001030s ]
  13. SELECT * FROM `article` WHERE `id` < 596573 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002651s ]
  14. SELECT * FROM `article` WHERE `id` < 596573 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003938s ]
  15. SELECT * FROM `article` WHERE `id` < 596573 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003365s ]
0.202525s