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Cha, Chaenyung
Integrative Biomaterials Engineering
Research Interests
  • Biomaterials, nanocomposites, microfabrication, tissue engineering, drug delivery

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Stiffness-Modulated Water Retention and Neovascularization of Dermal Fibroblast-Encapsulating Collagen Gel

Cited 1 times inthomson ciCited 1 times inthomson ci
Title
Stiffness-Modulated Water Retention and Neovascularization of Dermal Fibroblast-Encapsulating Collagen Gel
Author
Jeong, Jae HyunLiang, YouyunJang, MichelleCha, ChaenyungChu, CathyLee, HaekwangJung, WoonggyuKim, Jin WoongBoppart, Stephen A.Kong, Hyunjoon
Keywords
Chicken chorioallantoic membranes; Collagen fibrils; Dermal fibroblasts; Glycosaminoglycans; Neo-vascularization; Nuclear aspects; Production level; Tissue engineering scaffold
Issue Date
201306
Publisher
MARY ANN LIEBERT INC
Citation
TISSUE ENGINEERING PART A, v.19, no.11-12, pp.1275 - 1284
Abstract
There is increasing evidence that matrix stiffness modulates various phenotypic activities of cells surrounded by a three-dimensional (3D) matrix. These findings suggest that matrix stiffness can also regulate dermal fibroblasts activities to remodel, repair, and recreate skin dermis, but this has not yet been systematically demonstrated to date. This study examines the effects of matrix rigidity on the morphology, growth rates, and glycosaminoglycan (GAG) production of dermal fibroblasts cultured in collagen-based hydrogels with controlled elastic moduli. The elastic moduli (E) of collagen hydrogels were increased from 0.7 to 1.6 and 2.2 kPa by chemically cross-linking collagen fibrils with poly(ethylene glycol) disuccinimidylester. Increasing E of the hydrogel led to decreases in cellular spreading, nuclear aspect ratio, and growth rate. In contrast, the cellular GAG production level was elevated by increasing E from 0.7 to 1.6 kPa. The larger accumulation of GAG in the stiffer hydrogel led to increased water retention during exposure to air, as confirmed with magnetic resonance imaging. Additionally, in a chicken chorioallantoic membrane, a cell-encapsulating hydrogel with E of 1.6 kPa created dermis-like tissue with larger amount of GAG and density of blood vessels, while a cell-hydrogel construct with E of 0.7 kPa generated scar-like tissue. Overall, the results of this study will be highly useful for designing advanced tissue engineering scaffolds that can enhance the quality of a wide array of regenerated tissues including skin.
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DOI
http://dx.doi.org/10.1089/ten.tea.2012.0230
ISSN
2152-4947
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