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Nat. Commun. | 南京大学 | 细菌变身“抗癌战士”,还能光控清除!

  • 2026-04-10 05:47:54
Nat. Commun. | 南京大学 | 细菌变身“抗癌战士”,还能光控清除!

细菌变身“抗癌战士”,还能光控清除!

你有没有想过,细菌也能成为对抗癌症的“智能武器”?最近,南京大学赵劲教授、王秀秀研究员与魏炜副教授团队在国际顶级期刊《自然·通讯》(Nature Communications)上发表了一项突破性研究:他们改造了一种名为粘质沙雷菌Serratia marcescens)的细菌,让它不仅能自主合成强效抗癌物质,还能在完成任务后通过光照一键清除,大大提升了治疗的安全性与可控性。

这项研究巧妙地将合成生物学、免疫治疗与光热技术融为一体,为癌症治疗提供了一种全新的“活体生物杂合疗法”。


一种会“发光发热”的抗癌细菌

粘质沙雷菌本身并不陌生——它是一种自然界中常见的革兰氏阴性菌,因其能产生一种鲜红色的天然色素——灵菌红素(prodigiosin)而闻名。过去,科学家就知道灵菌红素具有抗菌、抗氧化甚至抗癌活性,但直接将其作为药物使用却面临重重困难:比如稳定性差、体内半衰期短、难以靶向肿瘤等。

南京大学团队另辟蹊径:不提取灵菌红素,而是让细菌自己带着“药厂”进肿瘤!他们首先通过紫外线诱变筛选,获得了一株高产灵菌红素的工程菌株(命名为SMM),在5升发酵罐中48小时内就能产出高达8.3克/升的灵菌红素——这已接近该菌天然合成能力的上限。

更令人惊喜的是,他们在实验中偶然发现:灵菌红素在808纳米近红外光激发下,能发出940–1300纳米的近红外荧光!这意味着它不仅能用于治疗,还具备成像诊断潜力,实现“诊疗一体化”。


杀癌三重奏:直接杀伤 + 免疫激活 + 光控清除

这种工程菌如何对抗肿瘤?研究团队在黑色素瘤和结直肠癌的小鼠模型中验证了它的“三重杀招”:

1. 直接诱导癌细胞死亡

灵菌红素能进入肿瘤细胞,触发线粒体自噬(mitophagy),进而引发一种特殊的程序性死亡——坏死性凋亡(necroptosis)和非caspase-3依赖的凋亡。简单说,就是从内部“引爆”癌细胞,效果显著。

2. 激活全身抗肿瘤免疫

注射工程菌后,小鼠体内出现了强烈的系统性免疫反应:树突状细胞成熟、T细胞大量募集到肿瘤部位,更重要的是,形成了长期免疫记忆——即使肿瘤复发,免疫系统也能迅速识别并清除,有效防止二次生长。

3. 光照一键清除,安全可控

最妙的是安全性设计!研究人员敲除了细菌中负责合成内毒素的关键基因 msbB,大幅降低其毒性。更关键的是,灵菌红素本身具有优异的光热转换能力。当用808纳米激光照射时,细菌局部温度迅速升至60℃以上,3分钟内即可实现超过8个数量级的细菌灭活(即几乎全部杀死)。这意味着医生可以在治疗结束后按需清除细菌,避免长期定植带来的风险。

(示意图:工程菌在激光照射下产生高温,实现快速清除)


为什么这项研究意义重大?

当前的细菌疗法大多依赖外源载药或复杂修饰,不仅效率低,还存在安全隐患。而这项研究完全利用细菌自身的生物合成能力,无需额外装载药物,既简化了工艺,又提高了疗效。

更重要的是,它实现了治疗-监测-清除的闭环控制: - 靶向缺氧肿瘤微环境(细菌天然趋性) - 原位生产抗癌分子(灵菌红素) - 激活免疫系统形成长期保护 - 光照精准清除残余细菌

这种“活体智能药物平台”为未来个性化癌症免疫治疗开辟了新路径,尤其适用于对传统疗法耐药或易复发的患者。


未来可期:从实验室走向临床

虽然目前研究仍在小鼠阶段,但粘质沙雷菌的高产能力、光控清除机制以及良好的安全性数据,为其临床转化奠定了坚实基础。下一步,团队或将优化菌株的免疫原性、探索与其他疗法(如PD-1抑制剂)的联合应用,并推进毒理与药代动力学研究。

可以想象,在不远的将来,医生或许只需向患者体内注射一剂“智能工程菌”,再配合一次简单的光照操作,就能实现精准、高效且可终止的癌症治疗


这项研究不仅展示了合成生物学的强大潜力,也让我们看到:最微小的生命体,也可能成为对抗最凶险疾病的利器

你觉得,未来的癌症治疗会越来越“生物化”吗?欢迎在评论区留言讨论!

📚 参考文献

Lihao Ji, Tianze Zhu, Tianqi Jiang, Li Wang, Zhonghui Qiu, Shiqi Gao, et al. A live biohybrid bacterial therapy based on engineered Serratia marcescensNat. Commun., 2026. DOI: https://doi.org/10.1038/s41467-026-70949-4.

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#细菌疗法 #合成生物学 #癌症免疫治疗 #光热治疗 #靶向递送

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  1. CONNECT:[ UseTime:0.000637s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000707s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001822s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000531s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000569s ]
  8. SELECT * FROM `article` WHERE `id` = 526826 LIMIT 1 [ RunTime:0.000379s ]
  9. UPDATE `article` SET `lasttime` = 1775828393 WHERE `id` = 526826 [ RunTime:0.009559s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000253s ]
  11. SELECT * FROM `article` WHERE `id` < 526826 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000461s ]
  12. SELECT * FROM `article` WHERE `id` > 526826 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002238s ]
  13. SELECT * FROM `article` WHERE `id` < 526826 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002211s ]
  14. SELECT * FROM `article` WHERE `id` < 526826 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006838s ]
  15. SELECT * FROM `article` WHERE `id` < 526826 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000828s ]
0.096184s