当前位置:首页>南京>IF44.5!恭喜南京医科大学博士生拿下《Cancer Cell》!揭示浆细胞经IgG-FcγRIIA轴促胶质母细胞瘤!

IF44.5!恭喜南京医科大学博士生拿下《Cancer Cell》!揭示浆细胞经IgG-FcγRIIA轴促胶质母细胞瘤!

  • 2026-05-09 12:13:04
IF44.5!恭喜南京医科大学博士生拿下《Cancer Cell》!揭示浆细胞经IgG-FcγRIIA轴促胶质母细胞瘤!

引言

肿瘤微环境里的浆细胞,竟是胶质母细胞瘤干细胞的“隐形推手”。

南京医科大学联合多家机构《Cancer Cell》发表重磅研究,首次揭示浸润性浆细胞通过分泌IgG抗体,直接“喂养”胶质母干细胞。

○ IgG与GSC表面的FcγRIIA受体结合,激活AKT-mTOR信号轴,驱动肿瘤干细胞增殖与自我更新;

○ 浆细胞通过CCL2-CCR2趋化信号被招募至GSC生态位,形成恶性互作闭环;

○ 胶质瘤中浆细胞富集、体细胞高频突变水平低,与患者不良预后显著相关。

💡这一发现揭示了免疫细胞—肿瘤干细胞之间“旁分泌对话”的隐秘通道📌,更为临床治疗指明新方向——靶向FcγRIIA受体或联合PI3K抑制剂,有望破解胶质母细胞瘤免疫治疗困局❗❗

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标题:浸润浆细胞通过IgG肿瘤结合维持胶质母细胞瘤干细胞

发表期刊Cancer Cell

发表时间:2025年1月

影响因子:IF44.5

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研究背景

胶质母细胞瘤中胶质母细胞瘤干细胞驱动肿瘤发生与耐药。浆细胞在胶质母细胞瘤中的浸润特征及功能尚不明确,其与胶质母细胞瘤干细胞的相互作用亟待探索。

研究思路

单细胞多组学分析:对肿瘤浸润B细胞进行单细胞RNA测序和单细胞BCR测序。

临床相关性分析:结合队列与TCGA数据库评估浆细胞与预后关系。

体内外功能验证:利用人源化小鼠和免疫缺陷小鼠,通过共移植、抗体中和、基因敲低验证浆细胞功能。

分子机制解析:通过免疫共沉淀、蛋白质印迹、通路富集阐明IgG-FcγRIIA-AKT-mTOR轴。

趋化与治疗干预:研究CCL2-CCR2招募机制,评估FcγRIIA阻断及联合PI3K抑制剂的疗效。

研究结果

01

浆细胞在胶质母细胞瘤B细胞谱系中异常富集

浆细胞占B细胞谱系7%-29%,高于外周血(图1J-1K)。发育轨迹显示免疫球蛋白增强(图1M-1N)。免疫荧光证实CD19⁺CD138⁺PRDM1⁺浆细胞存在(图1O)。

图1. 胶质母细胞瘤中肿瘤浸润浆细胞的异常富集

02

肿瘤浸润浆细胞预示不良预后

高频率浆细胞(CD138⁺PRDM1⁺)与较差总生存期相关(图2A-2C)。泛癌分析显示胶质母细胞瘤浆细胞特征评分升高最显著,体细胞高频突变率最低(图2D-2E)。浆细胞特征预示不良预后,而BCR信号受损(图2J-2K)。

图2. 肿瘤浸润性浆细胞预示胶质母细胞瘤不良预后

03

浆细胞促进胶质母细胞瘤生长

清除浆细胞抑制肿瘤生长并延长生存(图3A-3E)。共移植胶质母细胞瘤干细胞与浆细胞(肿瘤或外周血来源)加速肿瘤生长、缩短生存(图3F-3M)。非浆细胞B细胞无此效应。

图3. 肿瘤浸润性浆细胞促进胶质母细胞瘤生长并提示不良预后

04

浆细胞分泌的IgG促进胶质母细胞瘤增殖

浆细胞主要分泌IgG亚型(图4A-4E)。胶质母细胞瘤组织中IgG浓度升高(图4F-4G)。仅IgG(非IgA/IgM)促进胶质母细胞瘤干细胞增殖,去除IgG消除效应(图4I-4J)。脑内注射IgG加速肿瘤生长(图4K-4N)。

图4. 肿瘤浸润浆细胞分泌的免疫球蛋白G(IgG)促进胶质母细胞瘤增殖

05

IgG-FcγRIIA-AKT-mTOR轴介导浆细胞促瘤作用

FCGR2A(编码FcγRIIA)在胶质母细胞瘤干细胞高表达,与PI3K-AKT-mTOR信号正相关(图5A-5C)。浆细胞上清或IgG激活SYK/AKT/mTOR,敲低FCGR2A阻断效应(图5D-5F)。

体内敲低FCGR2A消除浆细胞或IgG促瘤作用(图5G-5L)。IgG1型免疫检查点抗体(atezolizumab、ipilimumab)通过FcγRIIA直接促胶质母细胞瘤干细胞增殖(图5M-5O)。

图5. IgG-FcgRIIA- AKT -mTOR轴促进肿瘤浸润浆细胞(PCs)刺激的胃鳞癌(GSC)肿瘤生长

06

浆细胞通过CCL2-CCR2轴被招募至胶质母细胞瘤干细胞微环境

胶质母细胞瘤干细胞高表达CCL2,浆细胞高表达CCR2(图6C-6F)。CCL2中和抗体或CCR2抑制剂阻断趋化(图6G-6H)。体内抑制CCL2-CCR2轴减少浆细胞浸润、抑制肿瘤生长(图6I-6Q)。

图6. 巨噬细胞(PCs)通过CCL2-CCR2趋化因子程序募集至胃鳞癌(GSC)微环境

07

FcγRIIA阻断抑制浆细胞刺激并减缓肿瘤生长

脑内注射IV.3延长共移植浆细胞荷瘤小鼠生存(图7A-7D)。联合PI3K抑制剂BKM-120进一步延长生存(图7E-7H)。IV.3可阻断IgG1型免疫检查点抗体对胶质母细胞瘤干细胞的促增殖作用(图7I-7K)。

图7. IgG受体阻断可抑制肿瘤浸润性PC-GSC的刺激作用,并在体内抑制GSC致瘤性

文章小结

该研究发现,胶质母细胞瘤中异常富集的浆细胞通过分泌IgG,结合胶质母细胞瘤干细胞表面的FcγRIIA并激活AKT-mTOR信号,促进肿瘤生长;同时胶质母细胞瘤干细胞通过CCL2-CCR2轴招募浆细胞形成正反馈。靶向FcγRIIA或联合PI3K抑制剂可抑制这一过程,且IgG1型免疫检查点抗体也可能通过该轴直接刺激肿瘤生长。

如果你也对数据分析感兴趣,想深入挖掘、复现高分思路,欢迎随时私信交流~点燃每一个科研火花,助力您的科研之旅!

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  1. CONNECT:[ UseTime:0.000611s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000831s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000355s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 538384 LIMIT 1 [ RunTime:0.002762s ]
  9. UPDATE `article` SET `lasttime` = 1779642649 WHERE `id` = 538384 [ RunTime:0.016677s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000269s ]
  11. SELECT * FROM `article` WHERE `id` < 538384 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000473s ]
  12. SELECT * FROM `article` WHERE `id` > 538384 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000362s ]
  13. SELECT * FROM `article` WHERE `id` < 538384 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000765s ]
  14. SELECT * FROM `article` WHERE `id` < 538384 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000730s ]
  15. SELECT * FROM `article` WHERE `id` < 538384 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000660s ]
0.095845s