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Vascular differentiation from pluripotent stem cells in 3-D auxetic scaffolds.
Auxetic scaffolds, that is, scaffolds that can display negative Poisson's ratio, have unique physical properties and can expand transversally when axially strained or contract under compression. Auxetic materials have been used for bioprostheses and artery stents due to the enhanced compressive strength and shear stiffness. In vascular tissue engineering, auxetic scaffolds allow the widening of blood vessels when blood flows through (creating compressive stress) to prevent the blockage. However, the influence of auxetic materials on the cellular fate decision in local environment is unclear. In this study, auxetic polyurethane foams were used to support vascular differentiation from pluripotent stem cells. The expression of alkaline phosphatase, Oct-4, and Nanog was lower after 4 days of differentiation for the cells grown in auxetic scaffolds. Higher expression of vascular markers CD31 and VE-cadherin was observed for the cells from auxetic scaffolds compared with those from the scaffolds before auxetic conversion. Little influence on the expression of cardiac marker α-actinin was observed. The vascular cells secreted extracellular matrix proteins vitronectin and laminin and expressed membrane-bound matrix metalloproteinase 9. The examination of Yes-associated protein expression indicated more cytoplasmic retention in the cells from auxetic scaffolds compared with those from regular scaffolds, suggesting that the auxetic scaffolds may affect cellular contraction. This study demonstrates a novel 3-D culture based on auxetic scaffolds for vascular differentiation and provides a platform to study the influence of biophysical microenvironments on differentiation of pluripotent stem cells. The outcome of this study has implications for regenerative medicine and drug discovery.
Authors : Song Liqing , Ahmed Mohammad Faisal , Li Yan , Zeng Changchun , Li Yan ,
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WP1794: Cell surface interactions at the vascular wall
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WP2064: Neural Crest Differentiation
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WP2081: SRF and miRs in Smooth Muscle Differentiation and Proliferation
WP2082: Cell Differentiation - Index
WP2231: Degradation of apoptotic cells
WP2276: Glial Cell Differentiation
WP2406: Cardiac Progenitor Differentiation
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Bibliography :
[29749038] Vascular differentiation from pluripotent stem cells in 3-D auxetic scaffolds.
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