Phenotypes and cellular mechanics of primary human aorta- and pluripotent stem cell-derived vascular smooth muscle cells

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ID: 334139
2026
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Abstract
Abstract Aims Mature, contractile vascular smooth muscle cells (vSMC) in muscular blood vessels can de-differentiate into synthetic vSMC, while human pluripotent stem cells (hPSC) differentiate into proliferating, fetal-like vSMC that can be induced to form contractile vSMC. Given the complicated embryonic origins and conflicting views on vSMC heterogeneity, our aim was to establish how closely hPSC-vSMC of a known germ layer lineage and defined phenotype are representative of vSMC obtained from aorta (AoSMC). Methods and Results We generated paraxial mesoderm (PM)-derived synthetic and contractile vSMC from hPSC lines and performed phenotypic and mechanical comparisons with AoSMC. Synthetic hPSC-vSMC and cultured AoSMC are proliferative, sensitive to contact inhibition and exhibit phenotype switching. Contractile hPSC-vSMC are non-proliferative, capable of phenotype switching and have elevated levels of contractile proteins (CNN1, TAGLN, ACTA2). These contractile proteins also displayed density-dependent, cell-to-cell heterogeneity in both AoSMC and hPSC-vSMC. Single-cell traction force measurements on micropost array detectors (mPADs) yielded comparable forces per micropost in the nN range across cell types. Quantitative 3D force measurements on humanized smooth muscle cell microtissues (SMTs) developed similar forces per cell. Larger forces were generated by MEKi-treated hPSC-vSMC and AoSMC versus controls. Conclusions We have systematically studied the properties of hPSC-vSMC and performed comprehensive phenotypic and mechanical comparisons with AoSMC. These results demonstrate that synthetic hPSC-vSMC generated in vitro and cultured AoSMC derived from tissues are comparable and mechanically similar, but results with hPSC-vSMC are more reproducible.
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Authors Chen Yu Huang, Stanley Chun Ming Wu, Melissa Kissling, Alexander Arking, Yi-Wen Chen, Franklyn D. Hall, Shankar Sivarajan, Harrison Yezzi, Daniel H. Reich, Kenneth R. Boheler
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Journal cardiovascular research
Year 2026
DOI
10.1093/cvr/cvag242
URL
https://doi.org/10.1093/cvr/cvag242
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