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IF14.1!5天Accept!南京中医药大学副校长“中药+分子对接”创新思路拿下双一区TOP!

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IF14.1!5天Accept!南京中医药大学副校长“中药+分子对接”创新思路拿下双一区TOP!
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引言/
INTRODUCTION

🔬当肾脏遭受持续损伤,一场由TGF‑β1驱动的纤维化风暴便在肾小管间质中悄然上演。

🧐南京中医药大学副校长胡立宏教授领衔的研究团队通过TCM‑SPred预测系统首次绘制了中药‑症状‑靶点全景图谱,揭示了DCL共价结合IQGAP1 Cys1534阻断Wnt信号的全新机制,展示了AI驱动药物发现与传统医学智慧结合的强大潜力🌿!

可借鉴的研究设计要点

基于多模态人工智能驱动的脱氢高良姜内酯作为靶向IQGAP1的强效肾纤维化缓解剂的鉴定

文献解读
ARTICLE Interpretation
01
研究背景

慢性肾脏病(CKD)导致的肾纤维化是全球重大健康挑战,目前缺乏有效疗法。从传统中药(TCM)中开发新药是重要方向,人工智能(AI)在药物发现中展现出巨大潜力,但现有模型在深度整合多模态数据方面仍有不足。

02
研究目的

本研究旨在开发一个新的多模态AI驱动模型,用于预测中药与疾病症状的关联,从而发现治疗肾纤维化的新型候选药物。

03
研究方法

1.数据收集

  • 数据库分析:利用Nephroseq在线数据库,分析人肾脏转录组数据。

  • 临床样本验证:收集了人类肾活检组织样本(研究经伦理委员会批准,患者知情同意)

2.模型构建:

  • 多源数据融合:整合了中药的语义信息、以及草药靶点与症状相关基因之间的关联。

  • 深度学习架构:采用双向长短期记忆网络 整合跨模态注意力机制,动态捕捉从融合的多模态表征中学习潜在的症状-中药关联。

3.组学分析:

  • 转录组学分析:对IQGAP1敲低的HK-2细胞进行RNA测序,通过KEGG富集分析发现Wnt信号通路变化最显著。

  • 免疫沉淀与Western blotting:用于检测蛋白质之间的相互作用及蛋白表达水平。

图解摘要

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主要结果
Results Interpretation
01
模型预测验证

研究构建了一个名为TCM-SPred的多模态AI模型,用于预测中药材与疾病症状的关联。该模型表现优异,平均AUC值高达0.95,准确率(TP率)超过97.16%,显示出强大的预测能力【图1A, B】

模型预测发现,木香(Aucklandiae Radix)与肾纤维化的30个核心症状关联得分最高(13.68分)在15个症状中位列首选药物,提示其治疗潜力【图1C, D】

图1.通过TCM-SPred预测系统揭示Aucklandiae Radix潜在抗肾纤维化活性

02
DCL的抗纤维化功效验证

在细胞层面,木香的主要活性成分去氢木香内酯(DCL)在TGF-β1诱导的HK-2人肾小管上皮细胞中表现出强效抗纤维化作用【图2A】

它能剂量依赖性地抑制α-SMA等纤维化标志物的表达,逆转EMT过程,且对肾小管上皮细胞的作用最为显著【图2B-E】

图2.DCL缓解TGF-β1诱导的纤维化肾小管上皮细胞

更重要的是,在UUO和叶酸诱导的两种小鼠肾纤维化模型中,口服DCL显著改善了肾脏的病理结构【图3B, C】

与阳性药吡非尼酮相比,DCL在治疗4天和8天后均表现出更优的抗纤维化效果【图3F-I】这些数据强有力地证明了DCL自身就具备良好的抗肾纤维化活性

图3.DCL缓解体内肾纤维化

03
靶点锁定与验证

为探寻DCL的作用靶点,研究团队合成了化学探针(Probe-DCL-1),并通过亲和富集联合质谱分析,筛选出334个潜在结合蛋白【图4A-D】

最终锁定支架蛋白IQGAP1为DCL的直接作用靶点,并通过SPR、CETSA等一系列生物物理实验证实了二者的强效结合【图4E-I】

图4.DCL直接靶向IQGAP1

04
靶点临床关联

分析临床数据库和患者样本发现,肾纤维化患者的肾脏中IQGAP1的表达水平显著升高,且与肾功能指标呈负相关【图5A-C】

在动物和细胞模型中也观察到了同样的现象【图5D-F】。功能获得与功能丧失实验进一步揭示,过表达IQGAP1削弱DCL的保护作用,说明DCL依赖IQGAP1【图5J-L】

图5.DCL与肾纤维化进程相关

05
结合位点解析

研究者更进一步,利用质谱分析和分子对接模拟,精确定位了DCL在IQGAP1蛋白上的结合位点。结果表明,DCL通过其迈克尔受体结构,共价结合在IQGAP1蛋白的第1534位半胱氨酸残基上【图6A-C】

当研究人员通过点突变将这个半胱氨酸替换为丙氨酸后,DCL对IQGAP1的热稳定效应及其抗纤维化作用都被显著削弱了【图6D-G】。这从分子结构层面解释了DCL与靶点结合的特异性

图6.绘制IQGAP1上DCL结合位点图谱

06

信号通路定位

转录组KEGG分析显示,IQGAP1敲低后Wnt信号通路的变化最为显著【图7A, B】。后续实验证实,DCL处理或IQGAP1敲低均可抑制Wnt激活,过表达IQGAP1则增强该通路,说明IQGAP1的作用确实依赖于Wnt通路【图7C-J】

图7.IQGAP1抑制Wnt信号通路

07
复合物阻断机制

通过免疫共沉淀联合质谱分析,研究者发现CCT3是与IQGAP1相互作用的关键蛋白,且该相互作用在DCL处理后显著减弱【图8A-B】。PLA实验进一步证实,DCL确实能阻断IQGAP1与CCT3在细胞内的结合【图8D】

Co-IP实验证实DCL处理后IQGAP1与CCT3的结合明显减少【图8E, F】。功能实验表明,敲低CCT3可抑制纤维化,而过表达CCT3则会抵消DCL的保护作用,说明CCT3是DCL发挥功能的关键下游分子【图8H- Q】

图8.DCL阻断IQGAP1与CCT3之间的相互作用,抑制Wnt信号通路的异常激活,并改善肾纤维化进展

08
体内基因验证

为进一步验证这两个靶点的治疗价值,研究者通过AAV在肾小管上皮细胞中特异性敲低了IQGAP1或CCT3。结果显示,敲低IQGAP1同样能减轻UUO诱导的肾纤维化,并抑制Wnt通路的激活,效果与DCL处理类似【图9D-H】

敲低CCT3同样显著改善肾脏病理损伤与纤维化,验证其作为抗纤维化靶点的潜力【图9J-M】。有力地印证了IQGAP1-CCT3轴是DCL发挥疗效的核心靶点通路

图9.特异性IQGAP1或CCT3基因缺失抑制小鼠肾纤维化

研究意义与创新点
 Significance and Innovations  
  • 方法创新:成功开发并应用了多模态AI模型TCM-SPred,实现中药-症状关联的精准预测。

  • 机制突破:发现IQGAP1-CCT3-Wnt轴为肾纤维化治疗新靶点,为靶向治疗提供新思路。

  • 转化潜力:DCL作为木香的主要成分,具有良好的体内外抗纤维化活性,且毒性低,为肾纤维化的临床治疗提供潜在候选药物。

文章小结
SUMMARY

总而言之,这项研究是一个融合人工智能、天然药物化学、分子生物学和疾病模型的交叉学科典范,系统性地完成了从“AI预测”到“药效验证”再到“靶点与机制深度阐释”的完整药物发现链条,为慢性肾病的治疗提供了全新的候选药物和分子机制。

如果你也想进行“国自然热点+多组学的研究,复现高分思路,欢迎联系,生信云分析,科研好助力!

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  1. CONNECT:[ UseTime:0.001088s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001624s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002458s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000710s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001334s ]
  6. SELECT * FROM `set` [ RunTime:0.000706s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001446s ]
  8. SELECT * FROM `article` WHERE `id` = 533995 LIMIT 1 [ RunTime:0.004862s ]
  9. UPDATE `article` SET `lasttime` = 1776734278 WHERE `id` = 533995 [ RunTime:0.006266s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000727s ]
  11. SELECT * FROM `article` WHERE `id` < 533995 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001159s ]
  12. SELECT * FROM `article` WHERE `id` > 533995 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005706s ]
  13. SELECT * FROM `article` WHERE `id` < 533995 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006338s ]
  14. SELECT * FROM `article` WHERE `id` < 533995 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010207s ]
  15. SELECT * FROM `article` WHERE `id` < 533995 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002171s ]
0.226444s