Inactivation of CBF/NF-Y in postnatal liver causes hepatocellular degeneration, lipid deposition, and endoplasmic reticulum stress.

Inactivation of CBF/NF-Y in postnatal liver causes hepatocellular degeneration, lipid deposition, and endoplasmic reticulum stress.
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DOI:
10.1038/srep00136
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发表时间:
2011
期刊:
影响因子:
4.6
通讯作者:
Maity, Sankar N.
Maity, Sankar N.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Luo, Rong;Klumpp, Sherry A.;Finegold, Milton J.;Maity, Sankar N.

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我们之前证明了 CBF 活性是细胞增殖和早期胚胎发育所必需的。为了检查CBF在分化肝细胞中的体内功能,我们在出生后有条件地删除肝细胞中的CBF-B。 CBF-B 缺失导致出生后 4 周进行性肝损伤和严重肝细胞变性。电子显微镜检查显示肝细胞的多效性变化,包括细胞和核尺寸增大、细胞内脂质沉积、内质网紊乱和线粒体异常。基因表达分析表明,CBF-B 的缺失激活了特定内质网 (ER) 应激调节基因的表达。 CBF-B 失活还抑制 C/EBP α 的表达,C/EBP α 是控制成人肝细胞中各种代谢过程的重要转录因子。总之,我们的研究首次揭示了 CBF 是控制成熟肝细胞内质网功能和代谢过程的关键转录因子。
We previously demonstrated that CBF activity is needed for cell proliferation and early embryonic development. To examine the in vivo function of CBF in differentiated hepatocytes, we conditionally deleted CBF-B in hepatocytes after birth. Deletion of CBF-B resulted in progressive liver injury and severe hepatocellular degeneration 4 weeks after birth. Electron microscopic examination demonstrated pleiotropic changes of hepatocytes including enlarged cell and nuclear size, intracellular lipid deposition, disorganized endoplasmic reticulum, and mitochondrial abnormalities. Gene expression analyses showed that deletion of CBF-B activated expression of specific endoplasmic reticulum (ER) stress-regulated genes. Inactivation of CBF-B also inhibited expression of C/EBP alpha, an important transcription factor controlling various metabolic processes in adult hepatocytes. Altogether, our study reveals for the first time that CBF is a key transcription factor controlling ER function and metabolic processes in mature hepatocytes.
持续的ER应力诱导剪接的Leader RNA沉默途径(SLS),导致Brucei锥虫的程序性细胞死亡。
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