title: Micropallet arrays with poly(ethylene glycol) walls.
abstract: Arrays of releasable micropallets with surrounding walls of poly(ethylene glycol) (PEG) were fabricated for the patterning and sorting of adherent cells. PEG walls were fabricated between the SU-8 pallets using a simple, mask-free strategy. By utilizing the difference in UV-transmittance of glass and SU-8, PEG monomer was selectively photopolymerized in the space surrounding the pallets. Since the PEG walls are composed of a cross-linked structure, the stability of the walls is independent of the pallet array geometry and the properties of the overlying solution. Even though surrounded with PEG walls, the individual pallets were detached from the array by the mechanical force generated by a focused laser pulse, with a release threshold of 6 microJ. Since the PEG hydrogels are repellent to protein adsorption and cell attachment, the walls localized cell growth to the pallet top surface. Cells grown in the microwells formed by the PEG walls were released by detaching the underlying pallet. The released cells/pallets were collected, cultured and clonally expanded. The micropallet arrays with PEG walls provide a platform for performing single cell analysis and sorting on chip.
authors.affiliation: Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599, USA.
authors.forename: Yuli
authors.initials: Y
authors.lastname: Wang
authors.forename: Georgina To'a
authors.initials: GT
authors.lastname: Salazar
authors.forename: Jeng-Hao
authors.initials: JH
authors.lastname: Pai
authors.forename: Hamed
authors.initials: H
authors.lastname: Shadpour
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Sims
authors.forename: Nancy L
authors.initials: NL
authors.lastname: Allbritton
mesh_terms: D002448:Cell Adhesion / Q000502:physiology / Q000528:radiation effects; D018929:Cell Culture Techniques / Q000295:instrumentation / Q000379:methods; D002470:Cell Survival / Q000502:physiology / Q000528:radiation effects; D006367:HeLa Cells; D006801:Humans; D007834:Lasers; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods; D011092:Polyethylene Glycols / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties; D046888:Tissue Array Analysis / Q000295:instrumentation
chemical_list: D011092:Polyethylene Glycols