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Nuclear Glycogenolysis Modulates Histone Acetylation in Human Non-Small Cell Lung Cancers.
Cell Metabolism ( IF 27.7 ) Pub Date : 2019-09-12 , DOI: 10.1016/j.cmet.2019.08.014
Ramon C Sun 1 , Vikas V Dukhande 2 , Zhengqiu Zhou 3 , Lyndsay E A Young 3 , Shane Emanuelle 3 , Christine Fillmore Brainson 4 , Matthew S Gentry 1
Affiliation  

Nuclear glycogen was first documented in the early 1940s, but its role in cellular physiology remained elusive. In this study, we utilized pure nuclei preparations and stable isotope tracers to define the origin and metabolic fate of nuclear glycogen. Herein, we describe a key function for nuclear glycogen in epigenetic regulation through compartmentalized pyruvate production and histone acetylation. This pathway is altered in human non-small cell lung cancers, as surgical specimens accumulate glycogen in the nucleus. We demonstrate that the decreased abundance of malin, an E3 ubiquitin ligase, impaired nuclear glycogenolysis by preventing the nuclear translocation of glycogen phosphorylase and causing nuclear glycogen accumulation. Re-introduction of malin in lung cancer cells restored nuclear glycogenolysis, increased histone acetylation, and decreased growth of cancer cells transplanted into mice. This study uncovers a previously unknown role for glycogen metabolism in the nucleus and elucidates another mechanism by which cellular metabolites control epigenetic regulation.

中文翻译:

核糖原分解调节人类非小细胞肺癌中的组蛋白乙酰化。

核糖原最早于1940年代初被记录,但其在细胞生理学中的作用仍然难以捉摸。在这项研究中,我们利用纯核制剂和稳定的同位素示踪剂来定义核糖原的起源和代谢命运。在这里,我们描述了通过间隔化丙酮酸生产和组蛋白乙酰化在表观遗传调控中的核糖原的关键功能。在人类非小细胞肺癌中,由于外科手术标本在细胞核中积累了糖原,因此该途径发生了改变。我们证明减少的马林,E3泛素连接酶的丰度,通过防止糖原磷酸化酶的核易位并引起核糖原积累,损害了核糖原分解。在肺癌细胞中重新引入马林蛋白可恢复核糖原分解,增加组蛋白乙酰化,并降低了移植到小鼠体内的癌细胞的生长。这项研究揭示了以前未知的糖原代谢在细胞核中的作用,并阐明了细胞代谢物控制表观遗传调控的另一种机制。
更新日期:2019-11-09
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