title: Dynamic cell patterning of photoresponsive hyaluronic acid hydrogels.
abstract: Techniques to pattern cells on biocompatible hydrogels allow for the creation of highly controlled cell microenvironments within materials that mimic the physicochemical properties of native tissues. Such technology has the potential to further enhance our knowledge of cell biology and to play a role in the development of novel tissue engineering devices. Light is an ideal stimulus to catalyze pattern formation since it can be controlled spatially as well as temporally. Herein, we have developed and enhanced a hydrogel cell patterning strategy. It is based on photoactive caged RGDS peptides incorporated into a hyaluronic acid (HA) hydrogel, which can be subsequently activated with near-UV light to create cell-adhesive regions within an otherwise non-adhesive hydrogel. With this strategy, we have been able to pattern multiple cell populations-either in contact with one another or held apart-on an underlying chemically patterned HA hydrogel. Furthermore, the hydrogel cell pattern could be altered with time, even 2 weeks after initial seeding, to create additional adhesive regions to regulate the direction of cell growth and migration. These dynamic hydrogel cell patterns, created with a standard fluorescence microscope, were shown to be robust and lasted at least 3 weeks in vitro.
authors.affiliation: Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
authors.forename: Catherine A
authors.initials: CA
authors.lastname: Goubko
authors.forename: Ajoy
authors.initials: A
authors.lastname: Basak
authors.forename: Swapan
authors.initials: S
authors.lastname: Majumdar
authors.forename: Xudong
authors.initials: X
authors.lastname: Cao
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000528:radiation effects; D002465:Cell Movement / Q000528:radiation effects; D006820:Hyaluronic Acid / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D008027:Light; D051379:Mice; D041681:NIH 3T3 Cells; D009842:Oligopeptides / Q000737:chemistry*; D055668:Photochemical Processes
chemical_list: D020100:Hydrogels; D009842:Oligopeptides; D006820:Hyaluronic Acid; C046617:arginyl-glycyl-aspartyl-serine
keywords: cell patterning; co-culture; dynamic; hyaluronic acid; photocaged peptides