Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359.

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Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 © 2013 S. Karger AG, Basel

Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 Fig. 1. Schematic of microbead fabrication using water-in-oil emulsification. © 2013 S. Karger AG, Basel

Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 Fig. 2. Average size and size distribution of chitosan/collagen microbeads created using varying emulsification impeller speeds (rpm). Average diameters are shown, with standard deviation in parentheses. Insets show light microscopy images of each microbead preparation. Scale bar = 300 µm. © 2013 S. Karger AG, Basel

Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 Fig. 3. Coomassie blue protein staining in pure chitosan (a) and chitosan/collagen (b) microbeads. Scale bar = 300 µm. © 2013 S. Karger AG, Basel

Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 Fig. 4. Viability staining of MSC embedded in microbeads with varying chitosan/collagen ratios at days 1 and 9 in culture. Scale bar = 200 µm. The cytoplasm of living cells is stained green and the nucleus of dead cells is stained red. © 2013 S. Karger AG, Basel

Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 Fig. 5. Gene expression (a) and calcium deposition (b) during osteogenic differentiation of MSC in chitosan/collagen microbeads. * Statistically significant difference from control group; # statistically significant difference from day 1. © 2013 S. Karger AG, Basel

Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 Fig. 6. Viability of MSC embedded in chitosan/collagen microbeads before injection (a) and after passing through 16- (b), 20- (c) and 25-gauge (d) needles (length 0.5 inch) at a flow rate of 1.0 ml/s. Scale bar = 200 µm. © 2013 S. Karger AG, Basel

Delivery of Mesenchymal Stem Cells in Chitosan/Collagen Microbeads for Orthopedic Tissue Repair Cells Tissues Organs 2013;197:333-343 - DOI:10.1159/000348359 Fig. 7. Images of chitosan/collagen microbead pastes after injection from a syringe (a) or standard needle (b). Extruded pastes are highly cohesive (c) and can be molded into desired geometries by centrifugation (d) or sculpting (e). Microbead constructs can be handled with surgical tools (c, f). Scale bar in each panel = 1 cm. © 2013 S. Karger AG, Basel