Matrix elasticity regulates lamin-A,C phosphorylation and turnover with feedback to actomyosin.

Matrix elasticity regulates lamin-A,C phosphorylation and turnover with feedback to actomyosin.
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DOI:
10.1016/j.cub.2014.07.001
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发表时间:
2014-08-18
期刊:
影响因子:
9.2
通讯作者:
Discher, Dennis E.
Discher, Dennis E.
中科院分区:
生物学1区
文献类型:
--
作者:
Buxboim, Amnon;Swift, Joe;Irianto, Jerome;Spinler, Kyle R.;Dingal, P. C. Dave P.;Athirasala, Avathamsa;Kao, Yun-Ruei C.;Cho, Sangkyun;Harada, Takamasa;Shin, Jae-Won;Discher, Dennis E.

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Tissue microenvironments are characterized not only in terms of chemical composition but also by collective properties such as stiffness, which influences the contractility of a cell, its adherent morphology, and even differentiation. The nucleoskeletal protein lamin-A,C increases with matrix stiffness, confers nuclear mechanical properties, and influences differentiation of mesenchymal stem cells (MSCs). Here we show in single cell analyses that matrix stiffness couples to myosin-II activity to promote lamin-A,C dephosphorylation at Ser22, which regulates turnover, lamina physical properties, and actomyosin expression. Lamin-A,C phosphorylation is low in interphase versus dividing cells and its levels rise with states of nuclear rounding in which myosin-II generates little to no tension. Phosphorylated lamin-A,C localizes to nucleoplasm, and phosphorylation is enriched on lamin-A,C fragments and is suppressed by a cyclin-dependent kinase (CDK) inhibitor. Lamin-A,C knockdown in primary MSCs suppresses transcripts predominantly among actomyosin genes, especially in the Serum Response Factor (SRF) pathway. Levels of myosin-IIA thus parallel levels of lamin-A,C, with phosphosite mutants revealing a key role for phospho-regulation. In modeling the system as a parsimonious gene circuit, tension-dependent stabilization of lamin-A,C and myosin-IIA is shown to suitably couple nuclear and cell morphology downstream of matrix mechanics.
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