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10.6/Q1,南京医科大学重磅发现!CD146+CAFs 成胃癌免疫抑制元凶,COL4A1 通路破解免疫治疗困局,多组学数据库联手锁定新靶点!

  • 2026-02-28 05:57:49
10.6/Q1,南京医科大学重磅发现!CD146+CAFs 成胃癌免疫抑制元凶,COL4A1 通路破解免疫治疗困局,多组学数据库联手锁定新靶点!

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中文标题CD146+CAFs通过COL4A1介导胃癌中的免疫抑制:潜在治疗靶点

发表期刊Journal for ImmunoTherapy of Cancer

发布时间:2025年12月

影响因子:10.6

01

研究背景

Hot

胃癌免疫治疗疗效有限,肿瘤微环境(TME)免疫抑制是关键障碍。癌相关成纤维细胞(CAFs)是 TME 核心成分,但其异质性及免疫调控机制尚未明确。亟需挖掘特异性 CAF 亚群及作用机制,为突破免疫治疗瓶颈提供新靶点。

02

研究方法

Hot

通过单细胞 RNA 测序(scRNA-seq)富集并分析 9 对胃癌及癌旁组织中的成纤维细胞;结合 TCGA、ACRG 等公共数据库,运用 CellChat、SCENIC 等生信工具解析细胞通讯及调控网络;通过体外共培养、流式细胞术、Western blot 等验证分子机制;构建人源化免疫重建胃癌异种移植模型,评估靶向治疗效果。

03

研究结果

Hot

1

scRNA-seq 鉴定出胃癌 TME 中富集的 CD146+CAF 亚群

从 8322 个成纤维细胞中鉴定出 8 个亚群,CD146+CAFs 在肿瘤组织中显著富集(图 1C-D),且几乎不存在于正常黏膜。该亚群高表达 NOTCH3、CD146 及 COL4A1(图 1J),伪时间轨迹分析显示其起源于 SOSC3+iCAFs 样前体细胞,富集 Notch、PI3K-AKT 等通路(图 2F)。

2

CD146+CAFs 与不良预后及 M2 型巨噬细胞浸润相关

TCGA-STAD 数据库显示,CD146、NOTCH3、COL4A1 高表达与胃癌患者短生存期相关(图 4B)。CD146+CAFs 丰度与肿瘤 T 分期、Lauren 分型相关,且与 M2 型肿瘤相关巨噬细胞(TAMs)浸润呈正相关(图 4H-I),提示其参与免疫抑制。

3

胃癌细胞通过 JAG1-NOTCH3 和 LGALS3-CD146 信号促进 CD146+CAFs 扩增

3D 共培养实验表明,胃癌细胞通过分泌 JAG1 结合 CAFs 表面 NOTCH3,同时通过 LGALS3 结合 CD146,双重信号促进 CD146+CAFs 增殖并抑制其凋亡(图 5A-I)。抑制剂或中和抗体可阻断该效应,证实信号通路的关键作用。

4

CD146+CAFs 通过 PI3K/AKT 通路分泌 COL4A1

NOTCH3 激活后结合 CD146 启动子驱动其转录,LGALS3 激活 CD146 下游 PI3K/AKT 通路,通过转录因子 EBF2 放大 CD146 表达,同时通过 TCF3 促进 COL4A1 分泌(图 6F-R),形成正反馈环路强化其功能表型。

5

CD146+CAFs 通过 COL4A1/CD44/IL7R 通路诱导巨噬细胞 M2 极化,抑制 CD8+T 细胞功能

CD146+CAFs 分泌的 COL4A1 结合巨噬细胞表面 CD44,激活 JAK1-STAT6 通路促进 M2 极化(图 7C-D),且 IL7R 是关键下游分子(图 7G-I)。M2 型巨噬细胞通过分泌 IL-10、TGF-β1 抑制 CD8+T 细胞增殖及细胞因子分泌(图 7K)。

6

靶向 CD146 或 COL4A1 可改善免疫微环境并抑制肿瘤生长

体内实验显示,抗 CD146 或抗 COL4A1 中和抗体可显著抑制肿瘤生长(图 8B-C),降低血清 IL-10、TGF-β1 水平(图 8D),减少 M2 型巨噬细胞浸润,增强 CD8+T 细胞浸润及功能(图 8E),证实其治疗潜力。

04

文章小结

Hot

本研究鉴定出胃癌 TME 中特异性富集的 CD146+CAF 亚群,其通过 JAG1-NOTCH3/LGALS3-CD146 信号扩增,分泌 COL4A1 诱导巨噬细胞 M2 极化,抑制 CD8+T 细胞功能。靶向 CD146 或 COL4A1 可重塑免疫微环境,为胃癌免疫治疗提供了新靶点及策略。

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往期回顾

4.2/Q2,多组学数据库助力发现!血浆 EVs 中 3 类 lncRNAs 破解 PCOS 合并 MetS 诊断难题

2024国自然医学中标名单揭晓,这些项目值得关注!

3.4/Q1,儿童和青少年偏头痛负担的上升趋势:1990 年至 2021 年的综合分析及未来预测

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  1. CONNECT:[ UseTime:0.000883s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001487s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000634s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000611s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001401s ]
  6. SELECT * FROM `set` [ RunTime:0.000514s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001460s ]
  8. SELECT * FROM `article` WHERE `id` = 463800 LIMIT 1 [ RunTime:0.001116s ]
  9. UPDATE `article` SET `lasttime` = 1772336407 WHERE `id` = 463800 [ RunTime:0.001405s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000773s ]
  11. SELECT * FROM `article` WHERE `id` < 463800 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001069s ]
  12. SELECT * FROM `article` WHERE `id` > 463800 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002104s ]
  13. SELECT * FROM `article` WHERE `id` < 463800 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007345s ]
  14. SELECT * FROM `article` WHERE `id` < 463800 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002636s ]
  15. SELECT * FROM `article` WHERE `id` < 463800 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001957s ]
0.191969s