SUN1/2 are essential for RhoA/ROCK-regulated actomyosin activity in isolated vascular smooth muscle cells

Porter, Sarah, Minaisah, Rose Marie, Ahmed, Sultan, Ali, Seema, Norton, Rosemary, Zhang, Qiuping, Ferraro, Elisa, Molenaar, Chris, Holt, Mark, Cox, Susan, Fountain, Samuel ORCID: https://orcid.org/0000-0002-6028-0548, Shanahan, Catherine and Warren, Derek (2020) SUN1/2 are essential for RhoA/ROCK-regulated actomyosin activity in isolated vascular smooth muscle cells. Cells, 9 (1). ISSN 2073-4409

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Abstract

Vascular smooth muscle cells (VSMCs) are the predominant cell type in the blood vessel wall. Changes in VSMC actomyosin activity and morphology are prevalent in cardiovascular disease. The actin cytoskeleton actively defines cellular shape and the LInker of Nucleoskeleton and Cytoskeleton (LINC) complex, comprised of nesprin and the Sad1p, UNC-84 (SUN)-domain family members SUN1/2, has emerged as a key regulator of actin cytoskeletal organisation. Although SUN1 and SUN2 function is partially redundant, they possess specific functions and LINC complex composition is tailored for cell-type-specific functions. We investigated the importance of SUN1 and SUN2 in regulating actomyosin activity and cell morphology in VSMCs. We demonstrate that siRNA-mediated depletion of either SUN1 or SUN2 altered VSMC spreading and impaired actomyosin activity and RhoA activity. Importantly, these findings were recapitulated using aortic VSMCs isolated from wild-type and SUN2 knockout (SUN2 KO) mice. Inhibition of actomyosin activity, using the rho-associated, coiled-coil-containing protein kinase1/2 (ROCK1/2) inhibitor Y27632 or blebbistatin, reduced SUN2 mobility in the nuclear envelope and decreased the association between SUN2 and lamin A, confirming that SUN2 dynamics and interactions are influenced by actomyosin activity. We propose that the LINC complex exists in a mechanical feedback circuit with RhoA to regulate VSMC actomyosin activity and morphology.

Item Type:	Article
Uncontrolled Keywords:	component,filamin,force,linc complex,linc complex,matrix stiffness,mechanisms,nesprins,nonmuscle myosin,nuclear-envelope,phenotype,rhoa,actomyosin,sdg 3 - good health and well-being ,/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being
Faculty \ School:	Faculty of Science > School of Pharmacy (former - to 2024) Faculty of Science > School of Biological Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Cells and Tissues Faculty of Science > Research Groups > Innovations in Pharmacy Education Faculty of Science > Research Groups > Molecular and Tissue Pharmacology
Related URLs:	https://www.mdpi.com/2073-4409/9/1/132
Depositing User:	LivePure Connector
Date Deposited:	15 Jan 2020 05:07
Last Modified:	12 Dec 2024 01:45
URI:	https://ueaeprints.uea.ac.uk/id/eprint/73646
DOI:	10.3390/cells9010132

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