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Cell Stem Cell | 郑州大学发现睡眠剥夺通过激活DMV—迷走神经—乙酰胆碱通路,抑制再摄取5-羟色胺,最终导致肠道损害

  • 2026-03-31 07:42:20
Cell Stem Cell | 郑州大学发现睡眠剥夺通过激活DMV—迷走神经—乙酰胆碱通路,抑制再摄取5-羟色胺,最终导致肠道损害

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睡眠不足是一种十分普遍的公共健康问题,与多种慢性疾病和死亡风险增加相关。睡眠剥夺可引发全身炎症反应,并在肠道产生过量活性氧,损害肠道功能。作者发现,睡眠剥夺会激活脑干的迷走神经背核(DMV),通过迷走神经向肠道释放过量乙酰胆碱,进而促进肠嗜铬细胞释放并减少再摄取血清素(5-HT)导致局部5-HT水平升高。过量5-HT通过HTR4受体诱导氧化应激,损害肠道干细胞功能,破坏肠道上皮稳态。原文请见文末。

今天为大家分享的是2026年2月,郑州大学于政权教授等在《Cell Stem Cell》上发表的一篇文章,发现睡眠剥夺通过激活DMV—迷走神经—乙酰胆碱通路促进肠嗜铬细胞释放并抑制再摄取5-HT经HTR4诱导ISC氧化应激,最终导致肠道病理改变。

摘要小结:

睡眠紊乱与多种慢性疾病的发病机制相关,包括慢性胃肠疾病。作者发现,急性睡眠剥夺(SD)会损伤肠道干细胞(ISC)功能,导致肠隐窝-绒毛结构变短及潘氏细胞丢失,且迷走神经背核(DMV)是对SD敏感的中枢神经中心,将睡眠影响传递至肠道。SD异常激活DMV神经元,驱动迷走神经向肠道释放过量乙酰胆碱。乙酰胆碱通过毒蕈碱受体促进肠嗜铬细胞释放5-羟色胺(5-HT)并抑制其再摄取,从而引起5-HT水平升高。升高的5-HT通过其受体HTR4在肠道干细胞中诱导过量氧化应激,促进肠道病理发生。

主要结论:

急性睡眠剥夺损伤肠道干细胞功能并扰乱上皮细胞更新

作者通过急性睡眠剥夺(SD)小鼠模型发现SD显著破坏小鼠睡眠结构,减少探索行为并增加休息需求。肠道方面,SD导致绒毛和隐窝缩短、上皮细胞增殖减少、近端及中段小肠凋亡细胞增多,同时潘氏细胞减少而隐窝内嗜铬细胞增多。Lgr5⁺和Olfm4⁺肠道干细胞数量下降,并伴随长期干细胞功能损伤和组织更新减缓,肠类器官生成能力下降,放射后再生能力受损。SD引发的肠道病理在抗生素处理小鼠中仍存在,提示其效应主要不依赖肠道菌群,且对近端和中段小肠影响最明显。

短期睡眠剥夺通过激活翻译应激反应损害肠道干细胞

作者通过蛋白质组学分析发现,急性睡眠剥夺(SD)诱导肠隐窝细胞的翻译应激反应(ISR),是ISCs功能受损的关键机制。SD显著上调p-eIF2α,促进应激颗粒形成,并激活ISR效应因子ATF4、GADD34和GADD153,同时诱导ISCs自噬,增加自噬体和自溶酶体数量,p62下降,LC3B II/I比值升高。此外,SD特异性在肠道和胃中触发K48依赖的蛋白降解,并伴随活性氧(ROS)积累、DNA损伤和抗氧化能力下降。抗氧化剂(维生素C或NAC)处理可缓解SD引发的ROS积累、降低p-eIF2α和泛素化水平,恢复ISCs数量和增殖能力。

短期睡眠剥夺扰乱5-羟色胺稳态并诱导肠道氧化应激

作者通过靶向代谢组学和功能实验揭示,睡眠剥夺(SD)显著增加肠道及血清中5-羟色胺(5-HT)水平,同时提高色氨酸代谢相关中间产物(TrpA、5-HTP、Kyn)。SD增加肠隐窝嗜铬细胞(EC细胞)数量,EC细胞产生的5-HT直接引发肠道干细胞(ISC)氧化应激、抑制增殖并损害类器官生长,体内注射5-HT也能复制SD肠道病理表现。Tph1基因敲除小鼠缺乏EC细胞5-HT后,SD诱导的肠道损伤和氧化应激显著缓解。进一步发现,SD通过抑制Slc6a4/SERT表达及启动子甲基化,降低5-HT再摄取,导致局部5-HT水平升高。综上,SD诱导的肠道5-HT激增主要由EC细胞产生并通过抑制再摄取维持,是介导SD相关肠道病理的关键机制。

肠道干细胞(ISCs)通过其配体受体HTR4响应5-羟色胺(5-HT)

作者通过单细胞测序发现,肠道干细胞(ISCs)中主要表达5-羟色胺(5-HT)受体HTR4。急性睡眠剥夺(SD)后,HTR4在肠隐窝中显著上调。体外实验显示,HTR4激动剂prucalopride模拟5-HT效应,抑制类器官生长、增加ROS和泛素化蛋白,而HTR4拮抗剂SB-203186可逆转这些效应。体内给药结果一致,HTR4激动剂诱发SD样肠道病理,HTR4拮抗剂GR113808则缓解SD引起的ISC减少、增殖下降、潘氏细胞丢失及氧化应激升高。条件性上皮特异性Htr4敲除小鼠(Htr4 cKO)在SD条件下表现出保护作用,其衍生类器官对5-HT刺激ROS水平显著降低。综上,ISC对过量5-HT的病理反应是通过上皮细胞HTR4介导的。

升高的乙酰胆碱(Ach)促使肠道中5-羟色胺(5-HT)积累

作者发现SD小鼠肠道Ach水平显著升高腹腔注射Ach或其稳定类似物carbachol可复制SD样肠道表型,包括隐窝-绒毛缩短、肠道干细胞(ISCs)、增殖细胞及潘氏细胞减少、氧化应激增加,以及HTR4和5-HT升高。机制研究表明,这一效应主要通过上皮毒蕈碱受体Chrm3介导:Chrm3条件性敲除小鼠在SD下肠道5-HT水平不升高,肠道病理受保护。体外实验显示,Ach直接促进EC细胞释放5-HT,并抑制5-HT再摄取载体SERT,从而维持肠道5-HT升高。综上,Ach通过促进5-HT释放和抑制再摄取,引发SD相关肠道病理。

总之,作者发现急性睡眠剥夺(SD)激活脑干迷走神经背核(DMV),通过迷走神经释放过量乙酰胆碱(Ach)至肠道上皮,Ach同时促进5-HT释放并抑制再摄取,导致肠道5-HT升高。过量5-HT通过HTR4作用于肠道干细胞(ISCs),引发氧化应激,损害干细胞自我更新和谱系分化,最终破坏上皮稳态。


文末彩蛋

研学不止

2026 Winter

原文:doi: 10.1016/j.stem.2026.01.002.

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  1. CONNECT:[ UseTime:0.000603s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000801s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000360s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000617s ]
  6. SELECT * FROM `set` [ RunTime:0.000213s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000593s ]
  8. SELECT * FROM `article` WHERE `id` = 496260 LIMIT 1 [ RunTime:0.000434s ]
  9. UPDATE `article` SET `lasttime` = 1776047088 WHERE `id` = 496260 [ RunTime:0.001481s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 496260 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000406s ]
  12. SELECT * FROM `article` WHERE `id` > 496260 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000398s ]
  13. SELECT * FROM `article` WHERE `id` < 496260 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003065s ]
  14. SELECT * FROM `article` WHERE `id` < 496260 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003377s ]
  15. SELECT * FROM `article` WHERE `id` < 496260 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008113s ]
0.132013s