Magnetic assembly of 3D cell clusters: visualizing the formation of an engineered tissue
| Autor: | Ishwar K. Puri, Suvojit Ghosh, Subbiah Elankumaran, S. R. P. Kumar |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
02 engineering and technology 03 medical and health sciences Tissue culture Magnetics Tissue engineering In vivo Cell Line Tumor Spheroids Cellular Extracellular Animals Humans Magnetite Nanoparticles Cell Shape Cell Aggregation Tissue Engineering Chemistry Spheroid Serum Albumin Bovine Cell Biology General Medicine Original Articles Fibroblasts 021001 nanoscience & nanotechnology equipment and supplies In vitro Cell aggregation Cell biology 030104 developmental biology Magnetic nanoparticles Cattle 0210 nano-technology human activities |
| Popis: | Objectives Contactless magnetic assembly of cells into 3D clusters has been proposed as a novel means for 3D tissue culture that eliminates the need for artificial scaffolds. However, thus far its efficacy has only been studied by comparing expression levels of generic proteins. Here, it has been evaluated by visualizing the evolution of cell clusters assembled by magnetic forces, to examine their resemblance to in vivo tissues. Materials and methods Cells were labeled with magnetic nanoparticles, then assembled into 3D clusters using magnetic force. Scanning electron microscopy was used to image intercellular interactions and morphological features of the clusters. Results When cells were held together by magnetic forces for a single day, they formed intercellular contacts through extracellular fibers. These kept the clusters intact once the magnetic forces were removed, thus serving the primary function of scaffolds. The cells self-organized into constructs consistent with the corresponding tissues in vivo. Epithelial cells formed sheets while fibroblasts formed spheroids and exhibited position-dependent morphological heterogeneity. Cells on the periphery of a cluster were flattened while those within were spheroidal, a well-known characteristic of connective tissues in vivo. Conclusions Cells assembled by magnetic forces presented visual features representative of their in vivo states but largely absent in monolayers. This established the efficacy of contactless assembly as a means to fabricate in vitro tissue models. |
| Databáze: | OpenAIRE |
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