在生殖中心缺氧下,爱斯坦-巴尔病毒驱动的B细胞转变需要外部不和脂肪酸
Larissa Havey1, Haixi You1, John M Asara2
1Department of Molecular Biology and Microbiology, Tufts University, Boston, MA 02111.
Research square
|May 2, 2025
概括
爱斯坦-巴尔病毒 (EBV) 在低氧条件下驱动癌症. 新的模型显示,感染EBV的B细胞适应新陈代谢,为治疗EBV相关淋巴瘤创造了脆弱性.
科学领域:
- 在瘤学瘤学.
- 病毒学 病毒学
- 细胞生物学 细胞生物学
背景情况:
- 爱斯坦-巴尔病毒 (EBV) 与每年超过20万例癌症病例有关,主要是侵袭性淋巴瘤.
- 这些淋巴瘤通常发生在缺氧生殖中心 (<1% O2),这是传统模型无法复制的微环境.
- 缺氧显著影响转化过程中的B细胞代谢重编程.
研究的目的:
- 在低氧条件下 (1% O2) 建立EBV驱动的B细胞转变的生理相关的ex vivo模型.
- 在低氧微环境中研究EBV转换的B细胞的代谢适应.
- 确定与EBV相关的B细胞恶性瘤中的潜在治疗漏洞.
主要方法:
- 在1%氧气下开发EBV驱动的B细胞转换的ex vivo模型.
- 多原子分析 (基因组学,转录组学,代谢组学) 来评估细胞变化.
- 诺莫西克和缺氧转化B细胞之间的代谢特征的比较.
主要成果:
- 该模型展示了强大的EBV驱动的B细胞转化和MYC在低氧状态下的超强增强器激活.
- 低毒B细胞抑制了脂肪酸合成,与依赖脂肪酸氧化的正常细胞不同.
- 转化细胞调节了糖脂代谢和脂质滴形成以缓冲脂质,增加了对外部不和脂肪酸的依赖.
结论:
- 这项研究提出了第一个生理上相关的ex vivo模型,用于EBV驱动的B细胞转化在缺氧.
- 在缺氧转变的B细胞中发现了明显的代谢适应,包括脂质处理.
- 这些发现揭示了代谢漏洞,可以指导针对EBV相关癌症的向治疗.
相关概念视频
Regulation of Angiogenesis and Blood Supply
2.5K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
2.5K
B Cell Activation and Differentiation
1.2K
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
1.2K
The Intrinsic Apoptotic Pathway
5.5K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
5.5K


