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Supercritical carbon dioxide dried double layer laponite XLS and alginate/polyacrylamide construct and immune response by Yagmur Filiz; Pelin Saglam-Metiner; Seymanur Ersoy; Ozlem Yesil-Celiktas is a Medicine article available to read on EtoBox.

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Fabrication of immunocompatible tissue constructs for bone-cartilage defect regeneration is of prime importance. In this study, a double layer hydrogel was successfully synthesized, where alginate/polyacrylamide were formulated to represent cartilage layer (5–10 % (w/w) total polymer ratio) and laponite XLS (2−5-8% (w/w))/alginate/polyacrylamide formed bone layer. Hydrogels were dried by supercritical CO2 at 100 and 200 bar, 45 °C, 5 g/min CO2 flow rate for 2 h. Constructs were treated with collagen, then cellularized and embedded in cell-laden GelMA to mimic the cellular microenvironment. The optimum weight ratio of alginate/polyacrylamide:laponite XLS was 10:5 based on mechanical strength test results. The constructs yielded high porosity (91.50 m2/g) and mesoporous structure, owing to the diffusivity of CO2 at 200 bar (0.49 × 10−7 m2/s). Constructs were then treated with collagen to increase cell adhesion and ATDC5 cells were seeded in the cartilage layer, whereas hFOB cells to the bone layer. About 10–15 % higher cell viability was attained. The porous structure of the construct allowed infiltration of macrophages, promoted polarization and positively affected the behavior of

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Author

Yagmur Filiz; Pelin Saglam-Metiner; Seymanur Ersoy; Ozlem Yesil-Celiktas

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Medicine (Health Sciences)