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IF48.5!武汉大学团队“国自然+多组学”登顶《Nature》!揭示MASH新靶点GPNMB-RYK轴!思路详解!

  • 2026-10-08 21:26:24
IF48.5!武汉大学团队“国自然+多组学”登顶《Nature》!揭示MASH新靶点GPNMB-RYK轴!思路详解!

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引言

恭喜!武汉大学团队登顶《Nature》:MASH治疗——破解GPNMB-RYK致病轴难题!

MASH全球患病率持续上升,有效治疗手段有限。GPNMB虽被发现高表达,但其分泌形式G-ECD如何驱动疾病、通过何种受体发挥作用,长期未解。

🔶为破解难题,团队证实分泌型G-ECD是真正致病形式,鉴定RYK为其功能性受体,阐明完整分子机制,并验证疫苗、中和抗体及GalNAc-siRNA三种策略均可有效预防或逆转MASH。

文献解读

文章题目:RYK作为GPNMB受体驱动MASH发生

发表期刊:Nature

发表时间:2026年4月

影响因子:IF48.5

研究背景

代谢相关脂肪性肝炎(MASH)全球患病率上升,有效疗法有限。GPNMB是MASH中上调最高的基因之一,但其分泌形式G-ECD是否直接驱动MASH、通过何种受体发挥作用,此前尚不明确

研究方法

    • 体内遗传模型验证:构建肝细胞特异性Gpnmb或Ryk敲除小鼠,在多种MASH模型(如AMLN饮食)中证实该轴驱动疾病进展。

    • 受体筛选与机制解析:利用细胞膜蛋白文库筛选鉴定RYK为G-ECD受体,阐明其结合后激活ERK1/2信号,上调PPARγ-CD36及SREBP1C脂生成通路。

    • 多策略治疗干预:开发疫苗、中和抗体、shRNA及GalNAc-siRNA四种手段,在预防及已建立的MASH模型中均验证了靶向治疗有效性。

    研究结果

    1.分泌型G-ECD是真正的致病形式

    GPNMB可被切割释放胞外域G-ECD。团队通过定点突变获得切割缺陷型L482G,构建四种变体回补至敲除小鼠肝脏【图1a】。

    结果显示,回补全长、△CTD和G-ECD均可恢复MASH,而L482G不能【图1e-i】。单纯过表达G-ECD即足以驱动MASH,证明分泌型G-ECD是真正的致病形式。

    图1:分泌型G-ECD是MASH的关键驱动因子

    2.GPNMB-RYK轴驱动MASH发生的功能验证

    团队通过RNA测序发现MASH小鼠肝脏中Gpnmb上调最显著。全身性或肝细胞特异性敲除Gpnmb均可减轻脂肪变性、炎症和纤维化【图2d-g】。

    利用细胞表面文库筛选及AAV8-shRNA敲低实验,证实RYK是G-ECD的功能性受体,敲低Ryk可显著保护小鼠免受MASH侵害【图2】。

    图2:RYK是GPNMB受体,为MASH发展所必需

    3.RYK是G-ECD驱动MASH的必需受体

    构建肝细胞特异性G-ECD转基因小鼠后MASH表型加重,但敲低Ryk后G-ECD的致病效应被完全消除【图3c-e】。

    双敲除实验表明,单独敲除Ryk即可阻断GPNMB过表达驱动的MASH,从遗传学证实RYK是G-ECD驱动MASH不可或缺的受体【图3h-j】。

    图3:肝细胞RYK是G-ECD驱动MASH所必需的

    4.ERK1/2介导G-ECD-RYK轴调控脂代谢的分子机制

    RNA-seq显示Gpnmb敲除后脂代谢通路显著下调【图4a-b】。蛋白印迹证实MASH小鼠肝脏p-ERK1/2升高,Gpnmb敲除后消失【图4d】。

    使用U0126或敲低ERK1/2均可阻断G-ECD诱导的靶基因表达,G-ECD处理10分钟后p-ERK1/2迅速升高【图4e-i】。

    图4:G-ECD-RYK通过ERK1/2信号激活PPARG-CD36和SREBP1C-脂生成通路

    5.靶向GPNMB-RYK轴的多策略治疗验证

    G-ECD疫苗可预防MASH【图5c-g】;中和抗体可逆转已建立的MASH【图5j-n】;GalNAc-siGpnmb实现肝靶向治疗,每月一次即可逆转MASH【图5q-u】。三种策略均验证了靶向GPNMB-RYK轴的治疗潜力。

    图5:靶向GPNMB-RYK轴可预防和治疗MASH

    文章小结

    本研究首次揭示GPNMB-RYK轴是MASH的关键致病通路,证实分泌型G-ECD是真正的致病形式。疫苗、中和抗体及GalNAc-siRNA三种策略均可有效预防或逆转MASH,为该疾病提供了全新的治疗靶点与转化方向。

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    139. /wwwdata/wwwroot/f.460.net.cn/runtime/temp/310a4debc7c38c2726b0b211618749f5.php ( 11.95 KB )
    140. /wwwdata/wwwroot/f.460.net.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
    1. CONNECT:[ UseTime:0.000932s ] mysql:host=127.0.0.1;port=3306;dbname=f460;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001501s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000544s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000498s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001866s ]
    6. SELECT * FROM `set` [ RunTime:0.000393s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001374s ]
    8. SELECT * FROM `article` WHERE `id` = 542237 LIMIT 1 [ RunTime:0.000585s ]
    9. UPDATE `article` SET `lasttime` = 1793605786 WHERE `id` = 542237 [ RunTime:0.003087s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000578s ]
    11. SELECT * FROM `article` WHERE `id` < 542237 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000946s ]
    12. SELECT * FROM `article` WHERE `id` > 542237 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000579s ]
    13. SELECT * FROM `article` WHERE `id` < 542237 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000574s ]
    14. SELECT * FROM `article` WHERE `id` < 542237 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000655s ]
    15. SELECT * FROM `article` WHERE `id` < 542237 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000745s ]
    0.061772s