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尿素衍生的核糖燃料限制葡萄糖的胰腺癌

Zeribe C Nwosu¹, Matthew H Ward^1,2,3,4, Peter Sajjakulnukit¹

¹Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA.

|May 17, 2023

概括

当葡萄糖稀缺时,胰腺癌细胞使用尿素作为一种重要的营养素. 这一发现揭示了一种新的代谢途径,即尿素酸化酶1 (UPP1),为胰腺管腺癌 (PDA) 提供了潜在的治疗点.

科学领域:

癌症学
代谢途径
癌症研究

背景情况:

胰腺管腺癌 (PDA) 具有高度的耐药性.
瘤微环境,低血管性和代谢变化有助于PDA的耐药性.
PDA使用的特定代谢燃料在很大程度上是未知的.

研究的目的:

在缺乏葡萄糖的条件下确定PDA细胞的替代营养来源.
研究尿素在PDA中的燃料作用.
探索针对PDA代谢途径的治疗潜力.

主要方法:

在营养限制下对21种胰腺细胞系对175种代谢物的影响进行了查.
评估尿素利用和尿素酶1 (UPP1) 表达之间的相关性.
通过KRAS-MAPK信号调节和通过营养限制增加UPP1的研究.
分析了患者瘤组织中的UPP1表达,并将其与生存数据相关联.
使用免疫能力较强的小鼠模型来评估UPP1删除对瘤生长的影响.

主要成果:

在缺乏葡萄糖的条件下确定尿素为PDA细胞的关键燃料来源.
尿素利用与UPP1表达有很强的相关性,该表达释放尿素衍生的核糖.
UPP1促进中央碳代谢,支持葡萄糖受限PDA细胞的氧化还原平衡,生存和繁殖.
UPP1由KRAS-MAPK信号调节,并通过PDA的营养限制进行上调.
瘤中的高UPP1表达与患者的生存率差相关.
尿素衍生的核糖在PDA瘤中被积极消化.
删除UPP1影响了PDA细胞利用尿素的能力,并减少了体内瘤的生长.

结论:

在营养缺乏的情况下,尿素是PDA细胞的重要补偿代谢燃料.
由UPP1介导的尿素利用途径代表了PDA的新型代谢脆弱性.
针对尿液代谢轴为胰腺管腺癌提供了潜在的新疗法.

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