Osteogenic and angiogenic tissue formation in high fidelity nanocomposite Laponite-gelatin bioinks.

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, a 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, and (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. HBMSC-laden LPN-GelMA scaffolds supported osteogenic differentiation evidenced by mineralised nodule formation, including in the absence of the osteogenic drug dexamethasone. Ex vivo implantation in a chick chorioallantoic membrane 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.

journal_name

Biofabrication

journal_title

Biofabrication

authors

Cidonio G,Alcala-Orozco CR,Lim KS,Glinka M,Mutreja I,Kim YH,Dawson JI,Woodfield TBF,Oreffo ROC

doi

10.1088/1758-5090/ab19fd

subject

Has Abstract

pub_date

2019-06-12 00:00:00

pages

035027

issue

3

eissn

1758-5082

issn

1758-5090

journal_volume

11

pub_type

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