LINC 协调衰老和核膜变化。

LINCing Senescence and Nuclear Envelope Changes.

机构信息

College of Health and Life Sciences, Hamad Bin Khalifa University, Doha P.O. Box 34110, Qatar.

KAUST Smart-Health Initiative and Biological and Environmental Science and Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), Jeddah 21589, Saudi Arabia.

出版信息

Cells. 2022 May 30;11(11):1787. doi: 10.3390/cells11111787.

Abstract

The nuclear envelope (NE) has emerged as a nexus for cellular organization, signaling, and survival. Beyond its role as a barrier to separate the nucleoplasm from the cytoplasm, the NE's role in supporting and maintaining a myriad of other functions has made it a target of study in many cellular processes, including senescence. The nucleus undergoes dramatic changes in senescence, many of which are driven by changes in the NE. Indeed, Lamin B1, a key NE protein that is consistently downregulated in senescence, has become a marker for senescence. Other NE proteins have also been shown to play a role in senescence, including LINC (linker of nucleoskeleton and cytoskeleton) complex proteins. LINC complexes span the NE, forming physical connections between the cytoplasm to the nucleoplasm. In this way, they integrate nuclear and cytoplasmic mechanical signals and are essential not only for a variety of cellular functions but are needed for cell survival. However, LINC complex proteins have been shown to have a myriad of functions in addition to forming a LINC complex, often existing as nucleoplasmic or cytoplasmic soluble proteins in a variety of isoforms. Some of these proteins have now been shown to play important roles in DNA repair, cell signaling, and nuclear shape regulation, all of which are important in senescence. This review will focus on some of these roles and highlight the importance of LINC complex proteins in senescence.

摘要

核膜(NE)已成为细胞组织、信号和存活的交汇点。除了作为将核质与细胞质分隔的屏障的作用外,NE 在支持和维持众多其他功能方面的作用使其成为许多细胞过程的研究目标,包括衰老。在衰老过程中,细胞核会发生剧烈变化,其中许多变化是由 NE 的变化驱动的。事实上,核膜内层蛋白 B1(Lamin B1)是一种关键的 NE 蛋白,在衰老过程中持续下调,已成为衰老的标志物。其他 NE 蛋白也被证明在衰老中发挥作用,包括连接核骨架和细胞质的复合物(LINC)蛋白。LINC 复合物跨越 NE,在细胞质和核质之间形成物理连接。通过这种方式,它们整合核和细胞质的机械信号,不仅对各种细胞功能至关重要,而且对细胞存活也至关重要。然而,除了形成 LINC 复合物外,LINC 复合物蛋白还具有许多功能,通常以多种同工型的核质或细胞质可溶性蛋白形式存在。现在已经证明其中一些蛋白在 DNA 修复、细胞信号转导和核形状调节中发挥重要作用,所有这些在衰老中都很重要。这篇综述将重点介绍其中的一些作用,并强调 LINC 复合物蛋白在衰老中的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ccc7/9179861/702b0519d59a/cells-11-01787-g001.jpg

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