Accumulation of the inner nuclear envelope protein Sun1 is pathogenic in progeric and dystrophic laminopathies.

Accumulation of the inner nuclear envelope protein Sun1 is pathogenic in progeric and dystrophic laminopathies.
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DOI:
10.1016/j.cell.2012.01.059
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发表时间:
2012-04-27
期刊:
影响因子:
64.5
通讯作者:
Jeang KT
Jeang KT
中科院分区:
生物学1区
文献类型:
--
作者:
Chen CY;Chi YH;Mutalif RA;Starost MF;Myers TG;Anderson SA;Stewart CL;Jeang KT

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人类LMNA基因突变导致核纤层蛋白病,包括Emery-Dreifuss肌营养不良症(AD-EDMD)和Hutchinson-Gilford早衰症,即过早衰老综合征(HGPS)。Lmna null(Lmna−/−)和progeroid LmnaΔ9突变小鼠分别是AD-EDMD和HGPS的模型。这两种动物都出现了严重的组织病理学,寿命缩短。与HGPS细胞一样,Lmna−/−和LmnaΔ9成纤维细胞具有典型的畸形细胞核。出乎意料的是,同样缺乏内核膜蛋白Sun 1的Lmna−/−或LmnaΔ9小鼠显示出显著减少的组织病理学和延长的寿命。一致地,在LMNA突变体成纤维细胞和HGPS细胞中SUN 1过度积累的减少纠正了核缺陷和细胞衰老。总的来说,这些发现暗示Sun 1蛋白积累是Lmna−/−、LmnaΔ9和HGPS疾病中的常见致病事件。
Human LMNA gene mutations result in laminopathies that include Emery-Dreifuss Muscular Dystrophy (AD-EDMD) and Hutchinson-Gilford Progeria, the premature aging syndrome (HGPS). The Lmna null (Lmna−/−) and progeroid LmnaΔ9 mutant mice are models for AD-EDMD and HGPS respectively. Both animals develop severe tissue pathologies with abbreviated life spans. Like HGPS cells, Lmna−/− and LmnaΔ9 fibroblasts have typically misshapen nuclei. Unexpectedly, Lmna−/− or LmnaΔ9 mice that are also deficient for the inner nuclear membrane protein Sun1 show markedly reduced tissue pathologies and enhanced longevity. Concordantly, reduction of SUN1 over-accumulation in LMNA mutant fibroblasts and in HGPS cells corrected nuclear defects and cellular senescence. Collectively, these findings implicate Sun1 protein accumulation as a common pathogenic event in Lmna−/−, LmnaΔ9, and HGPS disorders.
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