title: Printing cell-laden gelatin constructs by free-form fabrication and enzymatic protein crosslinking.
abstract: Considerable interest has arisen in precision fabrication of cell bearing scaffolds and structures by free form fabrication. Gelatin is an ideal material for creating cell entrapping constructs, yet its application in free form fabrication remains challenging. We demonstrate the use of gelatin, crosslinked with microbial transglutaminase (mTgase), as a material to print cell bearing hydrogels for both 2-dimensional (2-D) precision patterns and 3-dimensional (3-D) constructs. The precision patterning was attained with 3 % gelatin and 2 % high molecular weight poly (ethylene oxide) (PEO) whereas 3-D constructs were obtained using a 5 % gelatin solution. These hydrogels, referred to as "bioinks" supported entrapped cell growth, allowing cell spreading and proliferation for both HEK293 cells and Human Umbilical Vein Endothelial Cells (HUVECs). These bioinks were shown to be dispensable by robotic precision, forming patterns and constructs that were insoluble and of suitable stiffness to endure post gelation handling. The two bioinks were further characterized for fabrication parameters and mechanical properties.
authors: Materials and Science Engineering, Division of Materials Technology, Nanyang Technological University, N4.1-01-30, 50 Nanyang Ave, Singapore, 639798, Singapore.
authors: Scott A
authors: SA
authors: Irvine
authors: Animesh
authors: A
authors: Agrawal
authors: Bae Hoon
authors: BH
authors: Lee
authors: Hui Yee
authors: HY
authors: Chua
authors: Kok Yao
authors: KY
authors: Low
authors: Boon Chong
authors: BC
authors: Lau
authors: Marcelle
authors: M
authors: Machluf
authors: Subbu
authors: S
authors: Venkatraman
mesh_terms: D005780:Gelatin / Q000737:chemistry*; D057809:HEK293 Cells; D061307:Human Umbilical Vein Endothelial Cells; D006801:Humans; D020100:Hydrogels / Q000737:chemistry*; D008422:Materials Testing; D054457:Tissue Scaffolds / Q000737:chemistry*; D011503:Transglutaminases / Q000737:chemistry*
chemical_list: D020100:Hydrogels; D005780:Gelatin; D011503:Transglutaminases
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