title: Rupture force of cell adhesion ligand tethers modulates biological activities of a cell-laden hydrogel.
abstract: Recent efforts to design a synthetic extracellular matrix for cell culture, engineering, and therapies greatly contributed to addressing biological roles of types and spatial organization of cell adhesion ligands. It is often suggested that ligand-matrix bond strength is another path to regulate cell adhesion and activities; however tools are lacking. To this end, this study demonstrates that a hydrogel coupled with integrin-binding deoxyribonucleic acid (DNA) tethers with pre-defined rupture forces can modulate cell adhesion, differentiation, and secretion activities due to the changes in the number and, likely, force of cells adhered to a gel. The rupture force of DNA tethers was tuned by altering the spatial arrangement of matrix-binding biotin groups. The DNA tethers were immobilized on a hydrogel of alginate grafted with biotin using avidin. Mesenchymal stem cells showed enhanced adhesion, neural differentiation, and paracrine secretion when cultured on the gel coupled with DNA tethers with higher rupture forces. Such innovative cell-matrix interface engineering would be broadly useful for a series of materials used for fundamental and applied studies on biological cells.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Institute of Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. hjkong06@illinois.edu.
authors.forename: Min Kyung
authors.initials: MK
authors.lastname: Lee
authors.forename: Jooyeon
authors.initials: J
authors.lastname: Park
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Wang
authors.forename: Mehdi
authors.initials: M
authors.lastname: Roein-Peikar
authors.forename: Eunkyung
authors.initials: E
authors.lastname: Ko
authors.forename: Ellen
authors.initials: E
authors.lastname: Qin
authors.forename: Jonghwi
authors.initials: J
authors.lastname: Lee
authors.forename: Taekjip
authors.initials: T
authors.lastname: Ha
authors.forename: Hyunjoon
authors.initials: H
authors.lastname: Kong
mesh_terms: D002448:Cell Adhesion; D002454:Cell Differentiation; D004247:DNA / Q000737:chemistry; D020100:Hydrogels; D008024:Ligands; D059630:Mesenchymal Stem Cells / Q000166:cytology; D066244:Proton Magnetic Resonance Spectroscopy
chemical_list: D020100:Hydrogels; D008024:Ligands; D004247:DNA