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Endothelial Cell Senescence Increases Traction Forces due to Age-Associated Changes in the Glycocalyx and SIRT1

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Abstract

Endothelial cell (EC) aging and senescence are key events in atherogenesis and cardiovascular disease development. Age-associated changes in the local mechanical environment of blood vessels have also been linked to atherosclerosis. However, the extent to which cell senescence affects mechanical forces generated by the cell is unclear. In this study, we sought to determine whether EC senescence increases traction forces through age-associated changes in the glycocalyx and antioxidant regulator deacetylase Sirtuin1 (SIRT1), which is downregulated during aging. Traction forces were higher in cells that had undergone more population doublings and changes in traction force were associated with altered actin localization. Older cells also had increased actin filament thickness. Depletion of heparan sulfate in young ECs elevated traction forces and actin filament thickness, while addition of heparan sulfate to the surface of aged ECs by treatment with angiopoietin-1 had the opposite effect. While inhibition of SIRT1 had no significant effect on traction forces or actin organization for young cells, activation of SIRT1 did reduce traction forces and increase peripheral actin in aged ECs. These results show that EC senescence increases traction forces and alters actin localization through changes to SIRT1 and the glycocalyx.

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Acknowledgments

This work was supported by a NSF Graduate Research Fellowship (T.M.C.), a McChesney Graduate Fellowship (T.M.C.), an Undergraduate Research Support Assistantship (J.B.Y.), and a Pratt Research Fellowship (J.J.F.).

Conflict of Interest

Tracy M. Cheung, Jessica B. Yan, Justin J. Fu, Jianyong Huang, Fan Yuan, and George A. Truskey declare that they have no conflict of interest.

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  1. Department of Biomedical Engineering, Duke University, 136 Hudson Hall, CB 90281, Durham, NC, 27708, USA

    Tracy M. Cheung, Jessica B. Yan, Justin J. Fu, Jianyong Huang, Fan Yuan & George A. Truskey

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Cheung, T.M., Yan, J.B., Fu, J.J. et al. Endothelial Cell Senescence Increases Traction Forces due to Age-Associated Changes in the Glycocalyx and SIRT1. Cel. Mol. Bioeng. 8, 63–75 (2015). https://doi.org/10.1007/s12195-014-0371-6

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