title: Bio-printing of collagen and VEGF-releasing fibrin gel scaffolds for neural stem cell culture.
abstract: Time-released delivery of soluble growth factors (GFs) in engineered hydrogel tissue constructs promotes the migration and proliferation of embedded cells, which is an important factor for designing scaffolds that ultimately aim for neural tissue regeneration. We report a tissue engineering technique to print murine neural stem cells (C17.2), collagen hydrogel, and GF (vascular endothelial growth factor: VEGF)-releasing fibrin gel to construct an artificial neural tissue. We examined the morphological changes of the printed C17.2 cells embedded in the collagen and its migration toward the fibrin gel. The cells showed high viability (92.89+/-2.32%) after printing, which was equivalent to that of manually-plated cells. C17.2 cells printed within 1mm from the border of VEGF-releasing fibrin gel showed GF-induced changes in their morphology. The cells printed in this range also migrated toward the fibrin gel, with the total migration distance of 102.4+/-76.1microm over 3days. The cells in the control samples (fibrin without the VEGF or VEGF printed directly in collagen) neither proliferated nor migrated. The results demonstrated that bio-printing of VEGF-containing fibrin gel supported sustained release of the GF in the collagen scaffold. The presented method can be gainfully used in the development of three-dimensional (3D) artificial tissue assays and neural tissue regeneration applications.
authors.affiliation: Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
authors.forename: Yeong-Bae
authors.initials: YB
authors.lastname: Lee
authors.forename: Samuel
authors.initials: S
authors.lastname: Polio
authors.forename: Wonhye
authors.initials: W
authors.lastname: Lee
authors.forename: Guohao
authors.initials: G
authors.lastname: Dai
authors.forename: Lata
authors.initials: L
authors.lastname: Menon
authors.forename: Rona S
authors.initials: RS
authors.lastname: Carroll
authors.forename: Seung-Schik
authors.initials: SS
authors.lastname: Yoo
mesh_terms: D000818:Animals; D018929:Cell Culture Techniques; D002460:Cell Line; D002465:Cell Movement / Q000187:drug effects; D002470:Cell Survival; D024042:Collagen Type I / Q000494:pharmacology*; D005337:Fibrin; D020100:Hydrogels; D007834:Lasers; D051379:Mice; D009416:Nerve Regeneration; D009924:Organ Culture Techniques / Q000379:methods; D011327:Printing / Q000295:instrumentation; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds; D042461:Vascular Endothelial Growth Factor A / Q000494:pharmacology*
chemical_list: D024042:Collagen Type I; D020100:Hydrogels; D042461:Vascular Endothelial Growth Factor A; C467480:vascular endothelial growth factor A, mouse; D005337:Fibrin