Cidonio, Gianluca, Alcala Orozco, Cesar Roberto, Lim, Khoon, Glinka, Michael, Mutreja, Isha, Kim, Yanghee, Dawson, Jonathan, Woodfield, Tim and Oreffo, Richard (2019) Osteogenic and angiogenic tissue formation in high fidelity nanocomposite Laponite-gelatin bioinks. Biofabrication, 11 (3), [035027]. (doi:10.1088/1758-5090/ab19fd).
Abstract
Bioprinting of living cells is rapidly developing as an advanced biofabrication approach to engineer tissues. Bioinks can be extruded in three-dimensions (3D) to fabricate complex and hierarchical constructs for implantation. However, lack of functionality can often be attributed to poor bioink properties. Indeed, advanced bioinks encapsulating living cells should: (i) present optimal rheological properties and retain 3D structure post-fabrication, (ii) promote cell viability and support cell differentiation, (iii) localise proteins of interest (e.g. vascular endothelial growth factor (VEGF)) to stimulate encapsulated cell activity and tissue ingrowth upon implantation. In this study, we present the results of the inclusion of a synthetic nanoclay, Laponite (LPN) together with a gelatin methacryloyl (GelMA) bioink and the development of a functional cell-instructive bioink. A nanocomposite bioink displaying enhanced shape fidelity retention and interconnected porosity within extrusion-bioprinted fibres was observed. Human bone marrow stromal cell (HBMSC) viability within the nanocomposite showed no significant changes over 21 days of culture in LPN-GelMA (85.60 ± 10.27 %), compared to a significant decrease in GelMA from 7 (95.88 ± 2.90 %) to 21 days (55.54 ± 14.72 %) (p<0.01). HBMSCs were observed to proliferate in LPN-GelMA with a significant increase in cell number over 21 days (p<0.0001) compared to GelMA alone. HBMSCs-laden LPN-GelMA scaffolds supported osteogenic differentiation evidenced by mineralized nodule formation, including in the absence of the osteogenic drug dexamethasone. Ex vivo implantation in a chick chorioallantoic membrane (CAM) model, demonstrated excellent integration of the bioink constructs in the vascular chick embryo after 7 days of incubation. VEGF-loaded LPN-GelMA constructs demonstrated significantly higher vessel penetration than GelMA-VEGF (p<0.0001) scaffolds. Integration and vascularisation was directly related to increased drug absorption and retention by LPN-GelMA compared to LPN-free GelMA. In summary, a novel light-curable nanocomposite bioink for 3D skeletal regeneration supportive of cell growth and growth factor retention and delivery, evidenced by ex vivo vasculogenesis, was developed with potential application in hard and soft tissue reparation.
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- Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Southampton Marine & Maritime Institute (pre 2018 reorg)
- Faculties (pre 2018 reorg) > Faculty of Natural and Environmental Sciences (pre 2018 reorg) > Institute for Life Sciences (pre 2018 reorg)
Current Faculties > Faculty of Environmental and Life Sciences > Institute for Life Sciences > Institute for Life Sciences (pre 2018 reorg)
Institute for Life Sciences > Institute for Life Sciences (pre 2018 reorg) - Faculties (pre 2018 reorg) > Faculty of Medicine (pre 2018 reorg) > Medicine - Faculty Office (pre 2018 reorg)
- Current Faculties > Faculty of Medicine > Human Development and Health > Bone and Joint
Human Development and Health > Bone and Joint - Current Faculties > Faculty of Medicine > Human Development and Health
Human Development and Health
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