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IF 30.9!南京医科大学 博士一作,《cell》子刊!

  • 2026-04-10 04:57:16
IF 30.9!南京医科大学 博士一作,《cell》子刊!

引言

introduction

📍南京医科大学刘星吟教授《Cell Metabolism》

首次发现植物乳杆菌代谢物

“吲哚-3-乳酸”抑制结直肠癌。

✅多组学技术揭示益生菌抗癌的新机制。

✅自主鉴定关键代谢物ILA,

为结直肠癌治疗提供新思路👏!

如果你也想利用国自然热点+多组学进行生信分析,快关注我们后台咨询吧!生信百事通,助力每一个科研梦想!

Chanpter 01

文献解读

标题:植物乳杆菌来源的吲哚-3-乳酸通过表观遗传调控CD8+ T细胞免疫改善结直肠肿瘤发生

发表期刊:Cell Metabolism

影响因子:30.9/Q1

Chanpter 02

研究背景

结直肠癌CRC)与肠道菌群紊乱密切相关,益生菌虽显示抗肿瘤潜力,但其代谢产物如何通过表观遗传机制调控CD8⁺ T细胞抗肿瘤免疫尚不明确。

Chanpter 03

研究方法

利用多种结直肠癌小鼠模型,结合多组学及表观遗传学分析、免疫细胞过继转移等实验,探究植物乳杆菌L168及其代谢产物吲哚-3-乳酸ILA)对CD8⁺ T细胞免疫的调控作用。

图形摘要

Chanpter 04

研究思路

📌三大维度的研究思路框架已整理,点击图片查看。(5分钟获取核心要点)!

《ILA双重轴:

益生菌代谢物抗肠癌的表观遗传机制》

Chanpter 05

研究结果

1.菌株与代谢物

研究首先验证了植物乳杆菌L168LP-L168)对肠道病变的改善作用。在急性结肠炎模型中,LP-L168处理显著缓解了小鼠体重下降、结肠缩短等症状【图1A-1G】。

图1.LP-L168改善小鼠肠道炎症及致瘤性

在AOM/DSS诱导的结直肠癌模型中,LP-L168及其代谢物吲哚-3-乳酸ILA均展现出抗肿瘤效果,处理组肿瘤数量和负荷显著减少【图1H-1P,图2I-2P】。

图2.ILA缓解小鼠肠道炎症及致瘤性

这表明LP-L168及其衍生物ILA是抑制结直肠肿瘤发生的关键分子。

2.菌群与免疫

为探索作用机制,研究者分析了小鼠的肠道菌群与免疫状态。

结果显示,LP-L168和ILA处理显著重塑了菌群结构(β多样性,有益菌丰度增加,潜在有害菌减少【图3A-3D】。

图3.LP-L168/ILA治疗改善了

 AOM /二硫苏糖醇(DSS)小鼠肠道菌群

失调及细胞因子失调

伴随菌群变化促炎因子水平下降,而抗肿瘤免疫相关因子IL-12、IFN-γ水平显著升高【图3E-3J】。这提示LP-L168/ILA可能通过优化肠道微生态来重塑抗肿瘤免疫环境。

3.DC启动T细胞

鉴于IL-12水平升高,研究者将目光投向树突状细胞DC)。

图4.LP-L168/ILA治疗加速了

树突状细胞(DCs)中IL-12的产生,

并促进了针对肿瘤生长的CD8+ T细胞免疫应答

结果显示,LP-L168/ILA处理组小鼠肿瘤浸润DC中IL-12表达水平显著增高【图4A, 4B】,同时CD8⁺ T细胞产生IFN-γ的能力也得到增强【图4F-4H】。

抗体清除实验证实清除CD8⁺ T细胞后,LP-L168/ILA的抗肿瘤效果几乎完全消失【图4I-4N】。这证明激活CD8⁺ T细胞是ILA发挥抗肿瘤作用的核心环节。

4.DC-T细胞互作

为阐明ILA的靶向细胞,研究者进行了细胞转移实验。

图5.LP-L168/ILA治疗通过表观遗传调控

增强树突状细胞(DCs)中IL-12的表达,

从而促进 IFN +CD8+T细胞的初始激活

将ILA预处理过的CD8⁺ T细胞DC细胞分别过继转移给荷瘤小鼠,两者均能有效抑制肿瘤生长【图5A-5H】。

体外共培养进一步证实,ILA可直接促进DC与CD8⁺ T细胞相互作用,加速T细胞增殖,并增加IL-12和IFN-γ的分泌【图5I-5O】。

这表明ILA既能直接强化CD8⁺ T细胞,也能通过优化DC间接启动其抗肿瘤免疫。

5.表观调控IL12a

RNA测序显示,ILA处理的DC细胞中IL12a是上调最显著的基因之一【图5P-5R】。

图5.LP-L168/ILA治疗通过表观遗传调控

增强树突状细胞(DCs)中IL-12的表达,

从而促进 IFN +CD8+T细胞的初始激活

CUT&Tag分析发现,ILA处理增强了IL12a基因增强子区域的组蛋白乙酰化H3K27ac及染色质可及性【图5S-5X】。

这揭示了一种精巧的表观遗传调控模式:ILA通过“打开”特定基因位点的染色质,精准上调IL12a的表达,从而增强DC的免疫功能。

6.胆固醇与Saa3

鉴于胆固醇可诱导CD8⁺ T细胞耗竭,研究者探究了ILA对其胆固醇代谢的影响。

图6.LP-L168/ILA通过改变与胆固醇

代谢相关基因组的染色质可及性,

降低胆固醇含量以增强CD8+ T细胞的抗肿瘤活性

结果显示,LP-L168/ILA处理能降低肿瘤组织胆固醇水平,并恢复高胆固醇饮食诱导的CD8⁺ T细胞功能损伤【图6A-6H】。

RNA测序发现ILA处理显著下调了CD8⁺ T细胞中胆固醇代谢关键基因Saa3的表达【图6I, 6J】。

ATAC-seq和CUT&Tag分析表明,ILA处理在Saa3基因调控区诱导了染色质关闭抑制性组蛋白标记H3K27me3)的富集【图6K-6M】。

7.Saa3功能验证

最后,研究者验证了Saa3的核心作用。向肿瘤内注射SAA3蛋白,会促进肿瘤生长,

增加CD8⁺ T细胞胆固醇含量,并削弱其效应功能【图7A-7G】。而LP-L168/ILA处理能有效逆转这些负面影响。

图7.LP-L168/ILA通过降低CD8+ T细胞中

的胆固醇水平抑制SAA3蛋白诱导的肿瘤生长

在CD8⁺ T细胞中特异性敲低Saa3后,肿瘤生长显著减缓【图7H, 7I】。

这清晰地表明,ILA通过抑制Saa3表达来降低CD8⁺ T细胞胆固醇水平,从而保护其抗肿瘤效应功能,最终抑制结直肠肿瘤的生长。

文章小结

Summary of the article

ILA通过两种表观遗传机制增强CD8⁺ T细胞抗肿瘤免疫:促进树突状细胞产生IL-12,并抑制CD8⁺ T细胞中Saa3表达以降低其胆固醇水平,为结直肠癌的益生菌治疗提供了新靶点。

有生信分析需求的同学快来联系生信百事通吧!有消息一定及时回复!

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  1. CONNECT:[ UseTime:0.000547s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000646s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000310s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000514s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000648s ]
  8. SELECT * FROM `article` WHERE `id` = 520752 LIMIT 1 [ RunTime:0.000446s ]
  9. UPDATE `article` SET `lasttime` = 1776954956 WHERE `id` = 520752 [ RunTime:0.002450s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000237s ]
  11. SELECT * FROM `article` WHERE `id` < 520752 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000432s ]
  12. SELECT * FROM `article` WHERE `id` > 520752 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000376s ]
  13. SELECT * FROM `article` WHERE `id` < 520752 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000782s ]
  14. SELECT * FROM `article` WHERE `id` < 520752 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000711s ]
  15. SELECT * FROM `article` WHERE `id` < 520752 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001446s ]
0.080640s