当前位置:首页>南京>Redox Biology | 南京医科大学第一附属医院梁金花团队揭示CTPS1重塑CEPT1介导的磷脂代谢调控线粒体自噬驱动弥漫大B细胞淋巴瘤进展

Redox Biology | 南京医科大学第一附属医院梁金花团队揭示CTPS1重塑CEPT1介导的磷脂代谢调控线粒体自噬驱动弥漫大B细胞淋巴瘤进展

  • 2026-05-09 13:30:54
Redox Biology | 南京医科大学第一附属医院梁金花团队揭示CTPS1重塑CEPT1介导的磷脂代谢调控线粒体自噬驱动弥漫大B细胞淋巴瘤进展

分享一篇癌症细胞单细胞测序文章,使用新格元GEXSCOPE的单细胞测序(scRNA-seq),针对CTPS1敲除前后的淋巴细胞瘤细胞进行分析。

作者单位

南京医科大学第一附属医院(江苏省人民医院)血液科

Shang C, Du K, Zou Y, Han Y, Gong Y, Duan Z, Wu Y, Wang L, Li J, Gao R, Xu W, Liang J. CTPS1 modulates mitophagy to propel diffuse large B-cell lymphoma via reshaping CEPT1-mediated phospholipid metabolism. Redox Biol. 2026 May;92:104132. doi: 10.1016/j.redox.2026.104132. Epub 2026 Mar 19. PMID: 41865720.

背景

弥漫性大B细胞淋巴瘤(DLBCL)是成人中最常见的淋巴系统恶性肿瘤,具有高度的临床和遗传异质性。尽管一线治疗方案(如R-CHOP)对部分患者有效,但仍有不少患者面临复发、耐药或无法耐受强化疗的困境,亟需新的治疗靶点。CTPS1是嘧啶核苷酸合成通路中关键的限速酶,催化CTP的生成,已被证明在淋巴细胞增殖中发挥核心作用,且其选择性抑制剂已进入临床试验。近年来研究发现,磷脂代谢和线粒体自噬在肿瘤进展中扮演重要角色,但CTPS1是否通过调控这些过程影响DLBCL进展尚不清楚。因此,深入探索CTPS1在DLBCL中的功能及其分子机制,具有重要的临床转化潜力。

核心科学问题

CTPS1在DLBCL中是否高表达?它通过何种分子机制促进肿瘤进展?靶向CTPS1是否具有治疗价值?

主要研究结果

1. CTPS1高表达与DLBCL不良临床结局相关(Fig1)

通过对111例DLBCL患者的肿瘤组织进行免疫组化染色,发现CTPS1高表达组(约37%)患者呈现出更晚的临床分期、更高的LDH水平、更多的结外受累及更高的IPI评分。CTPS1高表达还与较短的总生存期(OS)和无进展生存期(PFS)显著相关,且这些患者的ctDNA水平更高、MRD阳性率更高。这些结果表明CTPS1是DLBCL的不良预后生物标志物。

2. CTPS1在体内外促进DLBCL进展(Fig2)

CTPS1在DLBCL肿瘤细胞中的表达显著高于正常B细胞。利用CRISPR/Cas9敲除CTPS1后,DLBCL细胞增殖受抑、凋亡增加,且细胞内CTP水平显著下降。外源性补充CTP可部分逆转这些表型,而补充其他核苷三磷酸无效。在NOD-SCID小鼠异种移植模型中,CTPS1敲除显著抑制肿瘤生长。这些结果证实CTPS1通过调控CTP合成驱动DLBCL进展。

3. CTPS1促进线粒体功能并增强线粒体自噬(Fig3)

RNA-seq显示CTPS1敲除后“自噬”和“线粒体自噬”通路显著下调,线粒体相关基因表达改变。CTPS1缺失导致线粒体膜蛋白TOM20/TIM23积累、线粒体数量增加,但线粒体呼吸功能(基础呼吸、ATP产生等)显著下降,同时线粒体ROS和脂质过氧化水平升高。透射电镜观察到线粒体肿胀和嵴断裂。机制上,CTPS1敲除降低了线粒体自噬受体BNIP3的表达,并抑制了LC3向线粒体的募集。这表明CTPS1通过BNIP3介导的线粒体自噬维持线粒体质量控制。

4. CTPS1诱导DLBCL中磷脂代谢重塑(Fig4)

代谢组学和脂质组学分析显示,CTPS1敲除后“甘油磷脂代谢”通路显著改变,磷脂酰胆碱(PC)和磷脂酰乙醇胺(PE)水平显著下降。单细胞RNA测序(scRNA-seq)进一步证实,高表达CTPS1的DLBCL细胞中磷脂代谢和线粒体自噬通路同时激活。这些结果提示CTPS1可能通过重塑磷脂代谢影响线粒体功能。

5. CTPS1通过上调CEPT1介导磷脂代谢重塑(Fig5)

整合分析筛选出CEPT1作为CTPS1调控磷脂代谢的关键下游效应分子。CTPS1敲除后CEPT1的mRNA和蛋白水平均显著下降,而外源性补充CTP可恢复CEPT1表达及PC/PE水平。CEPT1敲除同样抑制DLBCL细胞增殖并诱导凋亡,而高度同源的CHPT1敲除无此效应。因此,CTPS1通过“CTPS1-CTP-CEPT1”轴调控磷脂合成。

6. CTPS1通过CEPT1促进BNIP3介导的线粒体自噬(Fig6)

CTPS1过表达可上调LC3-II和BNIP3,而CEPT1敲除可逆转这一效应。CEPT1缺失导致线粒体膜中PC和PE含量下降,引起线粒体氧化应激、膜电位丧失及脂质过氧化增加,同时线粒体分裂/融合蛋白失衡、BNIP3减少。外源性补充PC和PE可显著修复上述线粒体功能缺陷和线粒体自噬障碍。这证明CEPT1通过维持磷脂稳态支持BNIP3介导的线粒体自噬。

7. 选择性CTPS1抑制剂R80降低DLBCL细胞活力(Fig7)

CTPS1选择性抑制剂R80以浓度依赖性方式抑制DLBCL细胞增殖、诱导凋亡,并降低CEPT1表达及PC/PE水平。R80处理同样引起线粒体ROS升高、膜电位下降及LC3-II/BNIP3表达降低。在SUDHL8异种移植小鼠模型中,R80显著抑制肿瘤生长,且肿瘤组织中CEPT1表达及血清PC/PE水平均下降。这表明靶向CTPS1是一种有潜力的DLBCL治疗策略。

总结

本研究首次揭示了CTPS1在DLBCL中通过“CTPS1-CTP-CEPT1”轴重塑甘油磷脂代谢,进而促进BNIP3介导的线粒体自噬,驱动肿瘤进展。CTPS1高表达是DLBCL患者不良预后的独立危险因素。研究还证实,选择性CTPS1抑制剂R80在体内外均表现出显著的抗肿瘤活性。这些发现为DLBCL的精准治疗提供了新的理论依据和潜在靶点。

材料与方法

  • 实验动物:NOD/SCID雄性小鼠(用于皮下异种移植模型)。

  • 细胞系:DLBCL细胞系FARAGE、SUDHL4、SUDHL8(来自ATCC)及U2932(来自DSMZ)。

  • 主要技术方法

    • CRISPR/Cas9基因敲除(靶向CTPS1、CEPT1等)。

    • 免疫组化(IHC)、免疫印迹(Immunoblot)、流式细胞术(凋亡、线粒体ROS、膜电位)。

    • RNA测序(RNA-seq)、单细胞RNA测序(scRNA-seq)。

    • 液相色谱-质谱联用(LC-MS)检测核苷酸代谢物、非靶向代谢组学、脂质组学。

    • Seahorse分析线粒体呼吸功能(OCR)。

    • 透射电子显微镜(TEM)观察线粒体超微结构。

  • 临床样本:111例DLBCL患者的原发性肿瘤组织(来自南京医科大学第一附属医院)。

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  1. CONNECT:[ UseTime:0.000901s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000988s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000346s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000302s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000699s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000689s ]
  8. SELECT * FROM `article` WHERE `id` = 541345 LIMIT 1 [ RunTime:0.000484s ]
  9. UPDATE `article` SET `lasttime` = 1779370947 WHERE `id` = 541345 [ RunTime:0.002245s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000247s ]
  11. SELECT * FROM `article` WHERE `id` < 541345 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000443s ]
  12. SELECT * FROM `article` WHERE `id` > 541345 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001204s ]
  13. SELECT * FROM `article` WHERE `id` < 541345 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002079s ]
  14. SELECT * FROM `article` WHERE `id` < 541345 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002161s ]
  15. SELECT * FROM `article` WHERE `id` < 541345 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003329s ]
0.096248s