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• W2600487169 abstract "Valvular interstitial cells (VICs) are key regulators of the heart valve's extracellular matrix (ECM), and upon tissue damage, quiescent VIC fibroblasts become activated to myofibroblasts. As the behavior of VICs during disease progression and wound healing is different compared to healthy tissue, we hypothesized that the organization of the matrix mechanics, which results from depositing of collagen fibers, would affect VIC phenotypic transition. Specifically, we investigated how the subcellular organization of ECM mechanical properties affects subcellular localization of Yes-associated protein (YAP), an early marker of mechanotransduction, and α-smooth muscle actin (α-SMA), a myofibroblast marker, in VICs. Photo-tunable hydrogels were used to generate substrates with different moduli and to create organized and disorganized patterns of varying elastic moduli. When porcine VICs were cultured on these matrices, YAP and α-SMA activation were significantly increased on substrates with higher elastic modulus or a higher percentage of stiff regions. Moreover, VICs cultured on substrates with a spatially disorganized elasticity had smaller focal adhesions, less nuclear localized YAP, less α-SMA organization into stress fibers and higher proliferation compared to those cultured on substrates with a regular mechanical organization. Collectively, these results suggest that disorganized spatial variations in mechanics that appear during wound healing and fibrotic disease progression may influence the maintenance of the VIC fibroblast phenotype, causing more proliferation, ECM remodeling and matrix deposition." @default.
• W2600487169 created "2017-04-07" @default.
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• W2600487169 date "2017-07-01" @default.
• W2600487169 modified "2023-10-17" @default.
• W2600487169 title "Myofibroblastic activation of valvular interstitial cells is modulated by spatial variations in matrix elasticity and its organization" @default.
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• W2600487169 doi "https://doi.org/10.1016/j.biomaterials.2017.03.040" @default.
• W2600487169 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5452973" @default.
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