Lamin microaggregates lead to altered mechanotransmission in progerin-expressing cells.

Lamin microaggregates lead to altered mechanotransmission in progerin-expressing cells.
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DOI:
10.1080/19491034.2020.1802906
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发表时间:
2020-12
期刊:
Nucleus (Austin, Tex.)
影响因子:
--
通讯作者:
Conway DE
Conway DE
中科院分区:
其他
文献类型:
--
作者:
Danielsson BE;Tieu KV;Bathula K;Armiger TJ;Vellala PS;Taylor RE;Dahl KN;Conway DE

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The nuclear lamina is a meshwork of intermediate filament proteins, and lamin A is the primary mechanical protein. An altered splicing of lamin A, known as progerin, causes the disease Hutchinson-Gilford progeria syndrome. Progerin-expressing cells have altered nuclear shapes and stiffened nuclear lamina with microaggregates of progerin. Here, progerin microaggregate inclusions in the lamina are shown to lead to cellular and multicellular dysfunction. We show with Comsol simulations that stiffened inclusions causes redistribution of normally homogeneous forces, and this redistribution is dependent on the stiffness difference and relatively independent of inclusion size. We also show mechanotransmission changes associated with progerin expression in cells under confinement and cells under external forces. Endothelial cells expressing progerin do not align properly with patterning. Fibroblasts expressing progerin do not align properly to applied cyclic force. Combined, these studies show that altered nuclear lamina mechanics and microstructure impacts cytoskeletal force transmission through the cell.
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