Diurnal Oscillations in Liver Mass and Cell Size Accompany Ribosome Assembly Cycles.

Diurnal Oscillations in Liver Mass and Cell Size Accompany Ribosome Assembly Cycles.
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核糖体组装周期的肝脏质量和细胞大小的昼夜振荡。

DOI:
10.1016/j.cell.2017.04.015
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发表时间:
2017-05-04
期刊:
影响因子:
64.5
通讯作者:
Schibler U
Schibler U
中科院分区:
生物学1区
文献类型:
--
作者:
Sinturel F;Gerber A;Mauvoisin D;Wang J;Gatfield D;Stubblefield JJ;Green CB;Gachon F;Schibler U

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肝脏在新陈代谢和异生物质解毒中起着关键作用,当动物活跃和进食时,这些过程必须特别有效。一个主要的问题是肝脏如何适应这些昼夜生理变化。在这里,我们表明,在小鼠中,肝脏质量、肝细胞大小和蛋白质水平遵循每日节律,其幅度取决于禁食和光暗周期。相关证据表明,全球蛋白质积累的日波动取决于核糖体数量的类似波动。尽管rRNA基因在一天中以相似的速率转录,但一些新合成的rRNA在细胞核中以与核糖体蛋白质合成相反的昼夜方式被多聚腺苷酸化和降解。基于对培养的成纤维细胞的研究,我们提出未包装成完整核糖体亚基的rRNA被聚腺苷酸聚合酶PAPD5聚腺苷酸化并被核外泌体降解。
The liver plays a pivotal role in metabolism and xenobiotic detoxification, processes that must be particularly efficient when animals are active and feed. A major question is how the liver adapts to these diurnal changes in physiology. Here, we show that, in mice, liver mass, hepatocyte size, and protein levels follow a daily rhythm, whose amplitude depends on both feeding-fasting and light-dark cycles. Correlative evidence suggests that the daily oscillation in global protein accumulation depends on a similar fluctuation in ribosome number. Whereas rRNA genes are transcribed at similar rates throughout the day, some newly synthesized rRNAs are polyadenylated and degraded in the nucleus in a robustly diurnal fashion with a phase opposite to that of ribosomal protein synthesis. Based on studies with cultured fibroblasts, we propose that rRNAs not packaged into complete ribosomal subunits are polyadenylated by the poly(A) polymerase PAPD5 and degraded by the nuclear exosome.
温度调节可冷诱导的RNA结合蛋白基因CIRBP的剪接效率。
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发表时间: 2016-09-01
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