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IF56.1!恭喜郑州大学李蓬校长荣登《Nature》!发现脂肪肝全新靶点CLCC1

  • 2026-07-21 16:54:38
IF56.1!恭喜郑州大学李蓬校长荣登《Nature》!发现脂肪肝全新靶点CLCC1

脂代谢相关肝病、高血脂相关疾病是目前代谢领域重点研究方向,内质网脂质合成功能高度依赖膜双层磷脂分布平衡,但介导该平衡感知的核心分子长期缺少明确证据。

北京大学陈晓伟教授&郑大校长李蓬院士团队发表在《Nature》的研究,依托多组学、冷冻电镜与基因编辑动物模型,鉴定CLCC1作为内质网膜失衡感应分子,阐明CLCC1-TMEM41B复合物调控磷脂翻转、肝脏脂蛋白分泌及全身脂质稳态完整调控路径,下文逐层拆解整套实验逻辑

文献解读

◆中文标题:CLCC1调控内质网膜双层平衡以维持脂质稳态

◆发表期刊:Nature

◆发表时间:2026年2月

◆影响因子:56.1

研究背景

内质网双层磷脂不对称分布,但膜失衡感知分子未知;前期发现TMEM41B是磷脂翻转酶,缺失会形成内质网包裹巨型脂滴(geLD),本研究筛选CLCC1,解析膜平衡调控脂代谢分子通路。

研究方法

➤采用冷冻电断层扫描、共聚焦成像、差异蛋白组、体外磷脂翻转实验、CRISPR肝细胞/小鼠基因敲除;

➤结合人类血脂GW遗传数据验证CLCC1生理功能

研究结果
01
异常脂滴形成

正常肝细胞脂滴游离在胞质,可团队在TMEM41B缺陷样本里发现完全反常结构,用电镜观测小鼠肝脏超微结构【图1a-c】,缺陷样本内出现微米级巨型脂滴,外层完整包裹内质膜、缺失PLIN2且富集CB5

面对特殊结构,他们利用差异蛋白组锁定CLCC1【图1e】单独敲除CLCC1的细胞复刻同款脂滴【图1l】,直接证明两蛋白功能高度关联

图1.CLCC1或TMEM41B缺失会诱导肝细胞生成内质网包裹巨型脂滴(geLD)

科普解读:geLD是磷脂失衡催生特殊脂储存结构,和普通胞质脂滴完全区分。

小编观点:很多代谢生信只筛选差异蛋白,忽略超微结构表型线索。这篇先靠电镜捕捉独特表型再反向筛基因,思路新颖,做肝脏脂代谢队列、细胞器组学的同行完全可以照搬这套实验设计。

02

蛋白互作与脂分泌

二者表型高度相似,是否存在直接结合?他们通过体外纯化、猴肝内源共沉淀【图2a-b】验证互作;GWAS数据【图2c-d】证实CLCC1变异关联人体血脂

肝特异性敲除后TMEM41B降解、APOB损耗,血浆脂蛋白、甘油三酯大幅下降肝脏脂分泌受阻

图2.CLCC1与TMEM41B形成复合物,共同调控肝脏脂质向外分泌

科普解读:CLCC1可稳定TMEM41B,保障肝脏脂蛋白合成释放。

小编观点:分子互作、人群遗传、动物表型三层证据层层嵌套,完美规避单一层面实验说服力弱的短板,想要冲击高分代谢文章,这套多维度验证框架值得直接参考复用。

03
膜失衡感应机制

互作关系确定后,CLCC1承担什么功能?AlphaFold预测其可形成环状寡聚;成像【图3d】显示它仅聚集在弯曲失衡内质膜截除内腔结构便丧失定位

体外实验证实复合物翻转活性远高于单独TMEM41B,确认CLCC1为膜平衡传感器

图3.CLCC1寡聚识别失衡内质膜,招募TMEM41B提升磷脂翻转活性

科普解读:CLCC1只靶向磷脂不对称内质膜,充当平衡传感器。

小编观点:单纯细胞成像只能证明空间共定位,体外脂质体重构补充酶活定量,把相关性升级为因果,机制类生信课题想要做实分子功能,体外重组体系是必不可少的加分实验。

04
自发脂肪肝表型

细胞机制清晰后,体内病理效应仍需验证。仅4周肝敲除小鼠肝脏肿大、脂堆积、转氨酶升高,切片可见气球样变、炎症纤维化;双敲无叠加病变【图4h】,证明二者同属一条通路

图4.CLCC1缺失会破坏内质网结构,快速诱导小鼠代谢相关脂肪性肝炎

科普解读:无需高脂造模,CLCC1缺失就能自主诱发脂肪肝炎。

小编观点:常规脂肪肝造模依赖高脂饲料,易混杂饮食干扰,该基因敲除自发模型排除外源变量,对脂肪肝机制解析、药物高通量筛选都具备极高实验价值。

05
逆转肥胖肝损伤

CLCC1缺失会致病,上调能否缓解损伤?细胞实验发现抑制MTP可逆转geLD;荧光探针【图5d】捕捉二者失衡膜共定位;肥胖小鼠天然低表达CLCC,外源回补可减轻肝脂蓄积与损伤。

图5.CLCC1可修复膜失衡,减轻肥胖诱导的肝脏脂质损伤

科普解读:肥胖会下调CLCC,补充后可恢复肝脏脂平衡。

小编观点:从细胞干预到肥胖动物回补,完整完成靶点功能正反验证,为生信筛选出的潜在治疗基因提供扎实体内转化层面的实验支撑。

文章小结

本研究首次证实CLCC1是内质网膜磷脂失衡感应分子,与TMEM41B协同调控磷脂跨层翻转,二者处于同一调控通路;通路受损会形成特殊内质网包裹脂滴、抑制肝脏脂蛋白分泌,无高脂干预也会诱发脂肪肝炎上调CLCC1可改善肥胖诱导的肝脏损伤;

整套融合冷冻电镜、多组学、基因编辑动物与人群遗传数据的多维验证方案,可为脂代谢相关生信课题提供完整研究范式参考。

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  1. CONNECT:[ UseTime:0.000616s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000831s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003507s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000651s ]
  6. SELECT * FROM `set` [ RunTime:0.000236s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000658s ]
  8. SELECT * FROM `article` WHERE `id` = 568530 LIMIT 1 [ RunTime:0.000500s ]
  9. UPDATE `article` SET `lasttime` = 1784676886 WHERE `id` = 568530 [ RunTime:0.034778s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000409s ]
  11. SELECT * FROM `article` WHERE `id` < 568530 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000722s ]
  12. SELECT * FROM `article` WHERE `id` > 568530 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001410s ]
  13. SELECT * FROM `article` WHERE `id` < 568530 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001109s ]
  14. SELECT * FROM `article` WHERE `id` < 568530 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000911s ]
  15. SELECT * FROM `article` WHERE `id` < 568530 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002829s ]
0.126477s