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郑州大学青年基金结题,尼克酰胺核糖调控线粒体自噬护肝新机制:SirT1-MST1-FUNDC1 通路解密

  • 2026-06-04 21:41:36
郑州大学青年基金结题,尼克酰胺核糖调控线粒体自噬护肝新机制:SirT1-MST1-FUNDC1 通路解密

导读

国家自然科学基金结题报告

我国酒精性肝病(ALD)患病率持续攀升,临床缺乏特效干预手段。郑州大学依托国家自然科学基金项目(82103817),揭示尼克酰胺核糖(NR) 通过SirT1 去乙酰化 MST1、激活FUNDC1 介导线粒体自噬,修复酒精所致肝损伤的分子机制,为膳食补充剂防治 ALD 提供全新理论支撑与实验依据。

研 究 背 景 

酒精性肝病(ALD)是长期过量饮酒引发的肝脏系列病变,涵盖脂肪肝、肝炎、纤维化乃至肝硬化,已成为我国重大慢性肝病负担。当前 ALD 发病机制尚未完全阐明,临床以戒酒与对症支持为主,缺乏靶向性干预药物。

尼克酰胺核糖(NR)作为NAD + 高效前体,可提升细胞 NAD + 水平,激活去乙酰化酶 SirT1,在代谢调控、细胞器稳态维护中发挥关键作用。线粒体是酒精代谢损伤核心靶点,线粒体自噬(mitophagy) 是清除受损线粒体、维持肝细胞质量的关键通路。前期研究提示 NR 可减轻酒精性肝损伤,但其调控线粒体自噬的具体分子轴与上下游机制尚不明确。

Hippo 通路核心激酶MST1被证实为线粒体自噬重要抑制因子,而 SirT1 可通过去乙酰化修饰调控激酶活性。基于此,本项目围绕SirT1-MST1-FUNDC1信号轴,系统解析 NR 调控线粒体自噬、保护酒精肝的分子机制,为 ALD 代谢干预开辟新方向。

内 容 简 介

一、NR 激活线粒体自噬,缓解酒精性肝损伤

研究采用 NIAAA 法构建 ALD 小鼠模型,证实NR 补充显著改善酒精诱导的肝脏脂肪蓄积、氧化应激与炎症反应,降低血清 ALT/AST、TG/FFA 及肝脏脂质沉积,恢复酒精代谢酶与脂代谢调控蛋白表达。电镜与蛋白检测显示:酒精可诱导线粒体自噬体形成,但自噬流受阻;NR 能恢复线粒体形态,提升 LC3B-II/I 比值、降低 P62 蓄积,增强FUNDC1表达,畅通线粒体自噬流。同时,NR 稳定溶酶体膜完整性,恢复 LAMP1、TFEB 及组织蛋白酶表达,保障自噬 - 溶酶体通路功能完整,实现受损线粒体高效清除。

二、NR 激活线粒体自噬依赖 FUNDC1 通路

机制研究证实,FUNDC1 是 NR 调控线粒体自噬的关键受体。酒精促进 FUNDC1 磷酸化,干扰其与 LC3B 的结合;NR 可促进 FUNDC1 去磷酸化,增强线粒体与自噬体的特异性识别与结合。在 E47 细胞中敲减 FUNDC1 后,NR 无法有效恢复线粒体自噬活性,即便 PINK1/Parkin、BNIP3/BNIP3L 等通路代偿激活,自噬流仍难以恢复,证明FUNDC1 介导的选择性线粒体自噬是 NR 发挥护肝作用的必需通路。

三、NR 通过抑制 MST1 激活 FUNDC1 线粒体自噬

项目首次明确MST1 是连接 NR 与线粒体自噬的关键节点。酒精显著激活 Hippo 通路,上调 MST1、下调 YAP/TAZ,抑制线粒体自噬;NR 可下调 MST1 表达、恢复 YAP 核质穿梭与转录活性,解除 MST1 对自噬的抑制。敲减 MST1 可模拟 NR 的保护效应,证实NR 通过抑制 MST1,解除对 FUNDC1 通路的阻滞,激活线粒体自噬。

四、SirT1 介导 MST1 去乙酰化,构成核心调控轴

深入揭示上游调控机制:NR 通过提升 NAD + 激活 SirT1,SirT1 直接与 MST1 结合并催化其去乙酰化修饰,降低 MST1 激酶活性。SirT1 敲减后,NR 无法降低 MST1 乙酰化水平,线粒体 LC3B 与 FUNDC1 募集受阻,自噬流再次阻断。最终确立SirT1-MST1 去乙酰化 - FUNDC1 线粒体自噬的完整分子轴,阐明 NR 护肝的核心机制。

结 论 

本项目系统揭示尼克酰胺核糖(NR) 防治酒精性肝病的全新分子机制:

NR→提升 NAD+→激活 SirT1;

SirT1→去乙酰化修饰→抑制 MST1 激酶活性;

MST1 抑制→解除对 FUNDC1 的阻滞→激活线粒体自噬;

畅通自噬 - 溶酶体通路,清除受损线粒体,减轻肝脏脂肪变、氧化应激与炎症损伤。

该成果首次建立SirT1-MST1-FUNDC1调控线粒体自噬的完整通路,明确 NR 作为膳食补充剂靶向线粒体质量控制干预 ALD 的科学依据,为酒精性肝病的营养防治与新药研发提供关键靶点与理论基础,具备重要的基础研究价值与临床转化前景。

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:0.000969s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000800s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003863s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000507s ]
  6. SELECT * FROM `set` [ RunTime:0.001043s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000584s ]
  8. SELECT * FROM `article` WHERE `id` = 542060 LIMIT 1 [ RunTime:0.001017s ]
  9. UPDATE `article` SET `lasttime` = 1780972407 WHERE `id` = 542060 [ RunTime:0.006117s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000268s ]
  11. SELECT * FROM `article` WHERE `id` < 542060 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000402s ]
  12. SELECT * FROM `article` WHERE `id` > 542060 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002359s ]
  13. SELECT * FROM `article` WHERE `id` < 542060 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002814s ]
  14. SELECT * FROM `article` WHERE `id` < 542060 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001620s ]
  15. SELECT * FROM `article` WHERE `id` < 542060 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003130s ]
0.176623s