Liquefied Microcapsules as Dual-Microcarriers for 3D+3D Bottom-Up Tissue Engineering
authors Correia, CR; Bjorge, IM; Zeng, JF; Matsusaki, M; Mano, JF
nationality International
author keywords 3D systems; bottom-up tissue engineering; cell encapsulation; layer-by-layer; microcapsules
abstract Cell encapsulation systems must ensure the diffusion of molecules to avoid the formation of necrotic cores. The architectural design of hydrogels, the gold standard tissue engineering strategy, is thus limited to a microsize range. To overcome such a limitation, liquefied microcapsules encapsulating cells and microparticles are proposed. Microcapsules with controlled sizes with average diameters of 608.5 +/- 122.3 mu m are produced at high rates by electrohydrodynamic atomization, and arginyl-glycyl-aspartic acid (RGD) domains are introduced in the multilayered membrane. While cells and microparticles interact toward the production of confined microaggregates, on the outside cell-mediated macroaggregates are formed due to the aggregation of microcapsules. The concept of simultaneous aggregation is herein termed as 3D+3D bottom-up tissue engineering. Microcapsules are cultured alone (microcapsule(1)) or on top of 2D cell beds composed of human umbilical vein endothelial cells (HUVECs) alone (microcapsule(2)) or cocultured with fibroblasts (microcapsule(3)). Microcapsules are able to support cell encapsulation shown by LiveDead, 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulphofenyl)-2H-tetrazolium (MTS), and dsDNA assays. Only microcapsule(3) are able to form macroaggregates, as shown by F-actin immunofluorescence. The bioactive 3D system also presented alkaline phosphatase activity, thus allowing osteogenic differentiation. Upon implantation using the chick chorioallontoic membrane (CAM) model, microcapsules recruit a similar number of vessels with alike geometric parameters in comparison with CAMs supplemented with basic fibroblast growth factor (bFGF).
publisher WILEY
issn 2192-2640
isbn 2192-2659
year published 2019
volume 8
issue 22
digital object identifier (doi) 10.1002/adhm.201901221
web of science category Engineering, Biomedical; Nanoscience & Nanotechnology; Materials Science, Biomaterials
subject category Engineering; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000489672200001