当前位置:首页>南昌>IF5.4!恭喜南昌二院聚焦“肠道菌群”拿下一区TOP,多组学+MR+分子对接:揭示肾IRI肠–肾轴新通路!

IF5.4!恭喜南昌二院聚焦“肠道菌群”拿下一区TOP,多组学+MR+分子对接:揭示肾IRI肠–肾轴新通路!

  • 2026-06-03 19:11:17
IF5.4!恭喜南昌二院聚焦“肠道菌群”拿下一区TOP,多组学+MR+分子对接:揭示肾IRI肠–肾轴新通路!

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引言

📝📝肾缺血再灌注损伤(IRI)是急性肾损伤的主要致病因素,涉及氧化应激与炎症级联激活。尽管肠道菌群代谢物短链脂肪酸参与全身免疫调控,但其在肾IRI中的具体作用机制仍不清楚。

✨✨南昌大学第二附属医院泌尿外科团队,整合转录组学、分子对接及孟德尔随机化分析,揭示了微生物代谢产物丙酸盐通过靶向JUN调控TNF/IL-17信号通路参与肾IRI的潜在机制。

研究创新点

机制创新

首次揭示微生物-丙酸-JUN轴调控肾IRI炎症的新通路

方法创新:

多组学+分子对接+MR联合解析肠-肾轴分子机制

转化创新:

明确Akk菌/布氏瘤胃球菌为肾IRI干预潜在靶点

如果你也想用同种方法进行数据分析,复现高分思路,欢迎联系玫瑰生信!

文献解读

文章标题:整合转录组学、分子对接和孟德尔随机化分析揭示肾缺血再灌注损伤中的微生物-丙酸盐-JUN通路

发表期刊:Virulence

发表时间:2026年5月14日

影响因子:5.4/Q1

研究背景

肾缺血再灌注损伤是急性肾损伤主要诱因,发病机制不明,临床缺乏有效干预靶点,炎症级联反应难以控制,肾组织损伤易持续进展,整体预后不佳,临床诊疗面临严峻困境。

研究方法

组学整合:

整合转录组差异表达、代谢物靶点预测及PPI网络,筛选核心基因JUN

分子模拟:

采用分子对接与100ns动力学模拟,评估丙酸盐与JUN蛋白的结合稳定性

因果推断:

运用双向孟德尔随机化及BWMR,鉴定肾损伤易感相关肠道菌群

图1:研究流程图

如果你也想用同种方法进行数据分析,复现高分思路,欢迎联系玫瑰生信!

研究结果

1

菌群靶点与肾IRI基因联合选筛

从gutMGene数据库获取277种菌群代谢物和238个人类肠道靶基因,经SEA与STP数据库分别预测出1383和1136个潜在靶点。取两数据库交集得到303个共同靶点,再与gutMGene收录的靶基因重叠,最终筛选出32个肠道微生物代谢物的核心人类靶基因。这一精简的靶点集合覆盖了短链脂肪酸等关键代谢物的作用分子,为后续将微生物代谢信号与肾IRI转录组数据对接提供了精准的候选基因池,其中JUN随后被识别为唯一重叠的关键交汇分子(图2)

图2:肠道菌群代谢物靶点鉴定

分析GSE126805和GSE90861两个肾IRI转录组数据集,分别鉴定出263个和641个差异表达基因(|log2FC|>1,调整p<0.05)。热图与火山图均显示IRI组与对照组的表达谱显著分离,JUN、FOS、ATF3等即刻早期基因普遍上调。取两数据集交集获得179个共同差异基因,这些基因在IRI中呈现一致性的转录改变,主要富集于炎症反应与氧化应激相关通路,为后续构建蛋白互作网络并识别核心调控因子提供了可靠的分子基础(图3)

图3:肾缺血再灌注损伤表达谱鉴定的共有差异表达基因

2

JUN等核心基因富集炎症通路

基于179个共同差异基因构建PPI网络,利用MCODE提取高连接模块,再通过cytoHubba的MCC算法排序,获得JUN、FOS、TNF、IL6、PTGS2等10个hub基因。GO富集分析显示这些基因参与神经炎症反应及脂多糖应答,KEGG通路则显著富集于IL-17和TNF信号轴。该结果揭示了JUN等核心基因紧密交织于经典炎症通路之中,提示它们可能作为上游代谢信号向下游效应分子传递的关键转录调控节点,在肾IRI中发挥枢纽作用(图4)

图4:肾缺血再灌注损伤核心基因鉴定与功能富集分析

3

JUN是菌群代谢关键枢纽

维恩图显示JUN是唯一同时属于32个代谢物靶点与10个IRI hub基因的分子。构建的“菌群-代谢物-靶点-通路-疾病”网络将丁酸盐和丙酸盐连接到JUN,进而指向IL-17/TNF通路。分子对接显示丁酸盐与丙酸盐对JUN蛋白的结合能分别为-13.4kcal/mol和-12.1kcal/mol,均形成稳定氢键。这表明JUN在肠道微生物代谢物与肾脏炎症之间扮演结构生物学桥梁,短链脂肪酸可通过直接结合JUN蛋白来潜在调控其转录活性(图5)

图5:JUN作为肠道来源调控靶点可受短链脂肪酸结合调控

4

丙酸-JUN复合物动态稳定性

对丁酸盐-JUN和丙酸盐-JUN复合物进行100 ns分子动力学模拟。丙酸盐体系的骨架RMSD更快达到平衡,Rg和SASA波动更小,自由能景观呈现单一集中的低能盆地;而丁酸盐体系则显示稍高的构象灵活性和多个亚稳态。氢键分析表明两者均为弱且瞬时的相互作用。综合轨迹参数,丙酸盐与JUN的结合稳定性和构象收敛性均优于丁酸盐,提示丙酸盐可能是更适配的生理配体,指导后续研究聚焦丙酸盐(图6)

图6:丁酸、丙酸与JUN蛋白的分子动力学模拟结果

5

MR锁定两个关键菌群

以207个肠道菌群为暴露、急性肾损伤为结局进行双样本孟德尔随机化分析。逆方差加权法结合贝叶斯加权孟德尔随机化验证,鉴定出8个与肾损伤易感性显著相关的菌群。其中Akkermansia muciniphila呈正向因果关联(OR=1.219,p=0.026),Ruminococcus bromii呈负向保护关联(OR=0.740,p=0.011)两个关键菌种均参与丙酸盐代谢,为上游“菌群-丙酸盐-JUN”调控轴提供了来自遗传学的因果证据支持(图7)

图7:MR分析揭示肠道菌群与肾IRI存在因果关联

针对Akkermansia muciniphila和Ruminococcus bromii分别绘制散点图、森林图和漏斗图。各单核苷酸多态性效应方向一致,MR-Egger截距检验未检测到水平多效性(p>0.05),Cochran’s Q检验亦未发现显著异质性(p>0.05)。反向孟德尔随机化分析未显示反向因果关联。这些敏感性分析证实两个菌群与肾损伤易感性之间的因果估计稳健可靠,不受混杂多效性干扰,进一步强化了二者作为潜在干预靶点的可信度(图8)

图8:MR证实两种关键菌与肾IRI存在因果关联

文章结论

本研究整合多组学、分子对接与孟德尔随机化分析,揭示肾缺血再灌注损伤中存在微生物-丙酸-JUN调控轴。证实阿克曼菌、布氏瘤胃球菌通过丙酸调控JUN及下游TNF/IL-17通路,为肠-肾轴机制提供新证据,也为肾脏炎性损伤靶向干预提供新思路。

往期推荐

IF20!《Nature》子刊重磅发现:“韩家淮院士团队”基因干预证实——ZBP1抑制可长效挽救认知衰退!

IF10.6!山东大学齐鲁医学院团队凭“CHARLS”荣登《Cell》子刊,揭示助听器正确使用,降低老年痴呆风险!

IF26.7!“西湖大学王怀民”团队最新研究成果:膜锚定+自组装双策略,攻克超级细菌耐药!

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  1. CONNECT:[ UseTime:0.001057s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001684s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000701s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006146s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001389s ]
  6. SELECT * FROM `set` [ RunTime:0.001869s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001557s ]
  8. SELECT * FROM `article` WHERE `id` = 519250 LIMIT 1 [ RunTime:0.001494s ]
  9. UPDATE `article` SET `lasttime` = 1780486388 WHERE `id` = 519250 [ RunTime:0.011170s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001621s ]
  11. SELECT * FROM `article` WHERE `id` < 519250 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001230s ]
  12. SELECT * FROM `article` WHERE `id` > 519250 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001164s ]
  13. SELECT * FROM `article` WHERE `id` < 519250 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012389s ]
  14. SELECT * FROM `article` WHERE `id` < 519250 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015499s ]
  15. SELECT * FROM `article` WHERE `id` < 519250 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018595s ]
0.174296s