当前位置:首页>南京>IF11.7!南京中医药大学团队“单细胞+分子机制+基因敲除”,顺利拿下顶刊!

IF11.7!南京中医药大学团队“单细胞+分子机制+基因敲除”,顺利拿下顶刊!

  • 2026-06-26 09:30:44
IF11.7!南京中医药大学团队“单细胞+分子机制+基因敲除”,顺利拿下顶刊!

🔬颠覆认知!被视作免疫抑制剂的地塞米松,竟是骨髓瘤天然免疫的解锁开关。

长期存在临床悖论:地塞米松本应抑制免疫,却常与免疫药联用。最新顶刊研究证实,⚡肿瘤依靠 GR-PPP1CB 复合物封锁 STING 通路逃避免疫攻击;地塞米松可拆散该复合物,重启抗肿瘤干扰素信号,强化 NK 杀伤、诱导抑癌巨噬细胞,提升达雷妥尤单抗疗效。

PP1 抑制剂能复刻该免疫激活作用,联合硼替佐米可显著延长荷瘤小鼠生存期,为骨髓瘤治疗开辟全新靶点。

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 Literature Analysis
文献解读

研究目的:

本研究旨在解开地塞米松抑炎却常联用骨髓瘤免疫药的临床矛盾,探明其调控 cGAS-STING 通路的分子机制,并挖掘 PPP1CB 作为骨髓瘤免疫治疗新靶点的应用价值。

研究设计:

整体研究设计:

  • 围绕地塞米松联用免疫药的临床矛盾,先探明 GR-PPP1CB 抑制 STING 的分子机制,再验证其对骨髓免疫微环境的调控,最后探索 PP1 抑制剂的临床联用潜力,多层次完成体外、细胞、动物联合验证。

关键研究方法:

  • 细胞实验

    选用多种骨髓瘤细胞、免疫细胞株及 9 例患者原代浆细胞;通过共沉淀、质谱、免疫荧光筛查 GR 互作蛋白,qPCR、WB 检测通路活化,共培养体系评估 NK、巨噬细胞功能与 ADCC 效应。

  • 测序分析

    对小鼠骨髓样本开展单细胞 RNA 测序,解析地塞米松干预后各类免疫细胞亚群比例、通路表达变化。

  • 动物模型

    构建 5TMM3VT 骨髓瘤同系小鼠、STING 敲除小鼠、B 细胞过继移植模型;分组给药,结合生存曲线、MicroCT 骨损伤、骨髓免疫组化评估体内疗效。

  • 药理与基因验证

    使用米非司酮、Salubrinal 等抑制剂;构建 GR、PPP1CB 干扰质粒及突变载体,明确蛋白互作关键结构域,佐证作用通路。

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 Research findings
研究结果

01、DXM激活多发性骨髓瘤细胞中的cGAS-STING信号和干扰素反应

团队先验证地塞米松(DXM)能否激活骨髓瘤 cGAS-STING 通路。

✅WB 结果显示 DXM 可剂量依赖性激活 STING/TBK1/IRF3,不影响 NF-κB;qPCR 证实其能上调各类干扰素相关基因,免疫荧光也观察到 IRF3 大量入核。

✅仅糖皮质激素类药物可触发该通路,矿物皮质激素无作用;提前阻断 GR 受体,DXM 的激活效应直接消失,证明作用完全依赖 GR。

✅研究同步在 9 例骨髓瘤患者原代浆细胞中重复出相同结果,从细胞株到临床样本双向验证 DXM 可有效激活骨髓瘤细胞天然免疫通路。

图 1 DXM激活MM细胞中的cGAS-STING信号和干扰素反应。


02、DXM通过增强NK细胞功能并驱动MM中的M1巨噬细胞极化来增强抗肿瘤免疫

单细胞测序与组织染色证实,地塞米松重塑骨髓瘤骨髓免疫微环境:整体免疫细胞总量下降,但功能性杀伤 NK、抑癌 M1 巨噬细胞占比明显提升,促瘤 M2 巨噬细胞减少。

✅地塞米松作用于骨髓瘤细胞后,会上调 MHC 类分子,释放可溶性因子,间接激活 NK 细胞,穿孔素、颗粒酶大量分泌,还能显著放大达雷妥尤单抗的 ADCC 杀伤效果。

✅巨噬细胞单独用地塞米松会偏向促瘤表型;但和骨髓瘤细胞共培养时,药物可推动巨噬细胞转为抗肿瘤 M1 型,提升抗原提呈能力。

图 2 DXM通过增强NK细胞功能并驱动MM中的M1巨噬细胞极化,增强抗肿瘤免疫。


03、DXM通过激活细胞内在的cGAS-STING信号来发挥抗MM免疫

体内动物实验印证地塞米松的抗肿瘤效果离不开免疫通路:

  • 对比免疫健全与免疫缺陷小鼠,地塞米松仅在正常免疫小鼠中有效抑制肿瘤、减轻骨髓瘤骨损伤。

  • 敲除 STING 基因后,地塞米松延长生存期、保护骨骼的作用完全消失,证实该药的抗肿瘤免疫作用完全依靠骨髓瘤细胞内 cGAS-STING 通路激活。

图 3 DXM通过激活细胞内在的cGAS-STING信号来发挥抗MM免疫。


04、DXM通过解离GR-TBK1-IRF3复合物,减轻MM细胞中GR介导的cGAS-STING信号抑制

GR 本身会持续压制 cGAS-STING 通路,敲低 GR 就能直接拉高干扰素相关基因表达。

✅地塞米松起效极快,半小时即可激活通路,且不依赖 GR 转录、p38/GSK3β 激酶通路,也不会提升胞内 DNA 含量。

机制核心:地塞米松结合 GR 后,拆散 GR-TBK1-IRF 抑制复合物,释放通路关键分子,启动干扰素应答并形成持续反馈。

图 4 DXM通过解离GR-TBK1-IRF3复合物,减轻MM细胞中GR介导的cGAS-STING信号抑制。

05、GPP1CB执行GR介导的cGAS-STING信号抑制,DXM则反向

质谱筛选证实,PPP1CB 是 GR 绑定的核心抑制蛋白,会直接让 TBK1/IRF3 失活,RIOK1 不起主要作用。

✅地塞米松结合 GR 后,拆开 GR-PPP1CB 复合物,解除通路抑制;PP1 抑制剂 Salubrinal 可复刻该激活效果。

✅结构实验明确结合区域:GR 中段结合 PPP1CB、末端结合 IRF,破坏任意一处结合位点,地塞米松便无法激活 STING 通路。

图 5 PPP1CB执行GR介导的cGAS-STING信号抑制,DXM则反向抑制。


06、药理学上的PP1抑制通过增强NK细胞毒性和M1巨噬细胞极化,增强抗骨髓瘤免疫

PP1 抑制剂 Salubrinal 能复刻地塞米松的免疫增益效果,提升 NK 杀伤能力,放大达雷妥尤单抗的 ADCC 作用,同时推动巨噬细胞转为抑癌 M1 型。

✅动物实验显示,抑制剂单药即可延长骨髓瘤小鼠生存期,和硼替佐米联用效果更佳,能明显改善骨髓免疫微环境。

图 6 药理学上PP1抑制通过增强NK细胞毒性和M1巨噬细胞极化,增强抗多发性骨髓瘤免疫。


 Article Summary

文章小结

该研究解开地塞米松联用免疫药的临床谜题,证实它可拆解 GR-PPP1CB 抑制复合物,重启 STING 通路,重塑骨髓免疫微环境,强化 NK 杀伤、推动 M1 巨噬细胞分化。PP1 抑制剂能复刻药效,与硼替佐米联用可延长荷瘤小鼠生存期,为骨髓瘤免疫联合疗法提供新靶点思路。


发医学SCI发文不迷路,就找生信分析台,无痛复刻高分发文思路!

今天的高分医学干货就和大家分享到这啦,如果大家有想拆解的期刊方向、想解决的发刊难题,可以后台咨询!

往期精彩回顾
IF52.7!中科大团队“四层组学联动”,斩获国产顶刊《STTT》!
IF11.2!詹启敏等联合团队“空间多组学”,破解三阴治疗难题!斩获顶刊!
IF12.5!上海交大叶幼琼等团队“单细胞转录组+基因敲除”,直接斩获《Science》子刊!
转发,点赞,在看,安排一下?

声明:本文仅记录个人生信学习心得与思考,仅供学术交流、自我复盘参考,不具备专业指导效力。文中观点若有不当或出错之处,恳请各位留言批评指正。

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  1. CONNECT:[ UseTime:0.000959s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001675s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000839s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000705s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001453s ]
  6. SELECT * FROM `set` [ RunTime:0.000600s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001588s ]
  8. SELECT * FROM `article` WHERE `id` = 593128 LIMIT 1 [ RunTime:0.000990s ]
  9. UPDATE `article` SET `lasttime` = 1782445166 WHERE `id` = 593128 [ RunTime:0.051157s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001680s ]
  11. SELECT * FROM `article` WHERE `id` < 593128 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001325s ]
  12. SELECT * FROM `article` WHERE `id` > 593128 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008749s ]
  13. SELECT * FROM `article` WHERE `id` < 593128 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018752s ]
  14. SELECT * FROM `article` WHERE `id` < 593128 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001970s ]
  15. SELECT * FROM `article` WHERE `id` < 593128 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004701s ]
0.288284s