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南京大学黄志强团队NC:肠道菌群失调如何通过胆汁酸驱动银屑病?| 热心肠日报

  • 2026-05-28 09:53:56
南京大学黄志强团队NC:肠道菌群失调如何通过胆汁酸驱动银屑病?| 热心肠日报
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本文要点

IF: 15.7
Gut microbiota-induced perturbation in bile acids alter keratinocyte lipid metabolism via FXR-NQO1 signaling in psoriasis
Panpan LianRenwei LuChaode Gu
Junaid WazirWentong WangYangyongyi ZongYun XiaJie NiHuimei ChenEnrico PetrettoEckardt TreuterRongrong FanAirong Yang
苏忠兰王宏伟黄志强
Article|2026-05-18|OA
10.1038/s41467-026-72417-5

背景与设计

针对银屑病中肠道菌群与脂质代谢异常的机制,结合临床样本、小鼠及无菌模型,利用代谢组学与基因编辑解析胆汁酸对角质细胞的影响。

核心概述

肠道菌群失调导致初级胆汁酸减少,削弱角质细胞FXR-NQO1信号轴,进而损害脂质代谢并加剧氧化应激,驱动银屑病样皮炎的发生。

临床与模型表型

银屑病患者及模型小鼠血清中甘氨鹅去氧胆酸等初级胆汁酸显著减少,伴随角质细胞中法尼醇X受体(FXR)表达的代偿性升高。

分子机制

染色质免疫共沉淀及荧光素酶实验证实,激活的FXR直接结合并上调NAD(P)H醌脱氢酶1(NQO1)表达,从而增强抗氧化能力并促进脂肪酸氧化。

体内功能验证

角质细胞特异性敲除Nr1h4(编码FXR)或药理学抑制NQO1,均显著加重小鼠表皮增生与炎症浸润,并逆转了受体激动剂的保护效应。

上游菌群调控

无菌小鼠模型或抗生素处理显著恢复了血清初级胆汁酸水平并改善皮损,补充嗜黏蛋白阿克曼菌同样驱动了该保护性代谢轴的激活。

核心关键词

肠道菌群银屑病胆汁酸法尼醇X受体NQO1脂质代谢角质细胞脂质代谢脂肪酸氧化氧化应激肠-皮肤轴

科普解读

银屑病,俗称“牛皮癣”,困扰着全球2%至3%的人口。这种疾病远不止是皮肤表面的红斑和鳞屑,其背后是角质形成细胞疯狂的异常增殖,以及迁延不愈的慢性炎症。长久以来,临床治疗主要聚焦于抑制皮肤内的免疫风暴,但一个根本问题始终悬而未决:这场“火灾”的火种,是否来自身体更深处?

一项近日发表于《Nature Communications》的研究,将目光投向了遥远的肠道。由南京大学医学院的黄志强、王宏伟以及南京医科大学第一附属医院的苏忠兰领导的团队发现,肠道菌群紊乱引起的胆汁酸代谢异常,正是一个关键的“远程点火装置”,它通过一个名为FXR-NQO1的信号轴,直接扰乱了皮肤角质形成细胞的脂质代谢。

追踪“信使分子”:从失衡的胆汁酸谱说起

为了寻找连接肠道与皮肤的信使,研究团队首先对银屑病患者和一种常用的咪喹莫特诱导的银屑病样小鼠模型进行了血液胆汁酸谱的精细分析。数据显示,无论是患者还是小鼠,其血清胆汁酸的组成均发生了显著且一致的改变。一个值得注意的发现是初级胆汁酸水平显著降低,而次级胆汁酸水平升高。这暗示了肠道菌群对胆汁酸的正常转化过程出现了失调。

在这一紊乱的谱图中,一种名为甘氨鹅脱氧胆酸(GCDCA)的初级胆汁酸引起了研究者的特别注意。GCDCA是核受体FXR的天然激动剂。分析显示,在银屑病患者和模型小鼠的皮损中,FXR的表达非但没有降低,反而异常升高,尤其是在表皮的棘层和颗粒层。这似乎是一种代偿性反应——身体感知到了GCDCA信号的不足,试图增加“信号接收器”的数量来维持功能。

基因敲除揭示关键角色:一条保护性的代谢轴心

为了验证上述猜想,团队设计了一个精巧的实验。他们利用Cre-loxP系统,在小鼠的角质形成细胞中特异性敲除了编码FXR的Nr1h4基因。结果极具说服力:在诱导银屑病后,这些皮肤细胞缺失FXR的小鼠,其皮损的严重程度显著加剧,表现为更严重的红斑、鳞屑和表皮增厚,同时伴随T淋巴细胞和巨噬细胞的大量浸润。这反向证实了,角质形成细胞中的FXR信号对于抑制银屑病进展起着至关重要的内在保护作用

那么,激活这条通路是否能产生治疗效果?研究者分别使用GCDCA和人工合成的FXR激动剂GW4064干预银屑病模型小鼠。结果正如预期,两者均能有效减轻皮损、降低银屑病严重程度评分,并抑制角质形成细胞的过度增殖。至此,一条由GCDCA激活的FXR通路被清晰地勾勒出来,它如同皮肤细胞内的一道“防火墙”,抵御着银屑病的病理进程。

防火墙的工作原理:从抗氧化到脂质燃烧

这道“防火墙”的具体工作机制是什么?研究团队通过RNA测序和一系列功能实验揭开了谜底。他们发现,FXR被激活后,能直接结合到下游基因NQO1的启动子区,显著上调其表达。NQO1是一种关键的抗氧化酶,它的表达增加,有效降低了角质形成细胞内的活性氧(ROS)水平

氧化应激的缓解,随之带来了更深远的影响。在银屑病状态下,角质形成细胞存在明显的脂质代谢异常:脂肪摄入增多而利用减少,导致脂质大量堆积。而FXR-NQO1通路的激活逆转了这一过程。数据显示,激动剂处理不仅减少了脂肪酸的转运,更重要的是促进了脂肪酸的β-氧化和ATP的生成。通俗地讲,FXR信号像是在细胞这个“锅炉房”里派遣了一位高效的工程师,它清除故障,排解压力,并重新点燃了燃烧多余脂肪的火焰,从而为细胞的正常生长和分化提供了稳定的能量环境。

源头活水:精准调控肠道菌群的治疗潜力

既然胆汁酸失调是下游问题的根源,那么上游的肠道菌群就成为了一个极具吸引力的干预靶点。研究团队利用无菌小鼠有力地证实,缺失肠道菌群能够通过恢复初级胆汁酸(如GCDCA)的水平,重新激活皮肤FXR-NQO1通路,从而显著缓解银屑病样炎症。

基于此,他们尝试了两种干预策略。其一是直接使用抗生素清除部分肠道菌群。其二是补充益生元和益生菌,特别是阿克曼氏菌(Akkermansia)与菊粉的组合。结果令人鼓舞,这两种策略均能有效改善小鼠的银屑病症状,并恢复肝脏中初级胆汁酸的合成。

这表明,通过调节肠道微生态,我们有望从源头上恢复异常的胆汁酸信号,为皮肤提供长程的、基础性的保护。这项临床前研究为此提供了一个清晰的模型,但研究者也冷静地指出,从动物实验到最终走向临床,仍需严谨的机制验证和治疗探索。它提示我们,健康的皮肤,或许需要从呵护肠道开始。

图片摘要

图片由AI生成,可能有错,请谨慎辨别。

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  1. CONNECT:[ UseTime:0.000746s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000924s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000553s ]
  6. SELECT * FROM `set` [ RunTime:0.000211s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000612s ]
  8. SELECT * FROM `article` WHERE `id` = 568008 LIMIT 1 [ RunTime:0.000509s ]
  9. UPDATE `article` SET `lasttime` = 1780224531 WHERE `id` = 568008 [ RunTime:0.002245s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 568008 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001411s ]
  12. SELECT * FROM `article` WHERE `id` > 568008 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002297s ]
  13. SELECT * FROM `article` WHERE `id` < 568008 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002340s ]
  14. SELECT * FROM `article` WHERE `id` < 568008 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003156s ]
  15. SELECT * FROM `article` WHERE `id` < 568008 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001308s ]
0.086408s