title: Retroviral transduction of adherent cells in resonant acoustic fields.
abstract: Ultrasound-induced cavitation has been extensively used to enhance the efficiency of nonviral-based gene delivery. Although such unique mechanical force could possibly augment the efficacy of retrovirus-mediated gene transfer, we harnessed an alternative approach, a resonant acoustic field, to facilitate the retroviral transduction rate. NIH 3T3 fibroblast cells suspended in a culture well and mixed with ecotropic retroviruses were co-treated with megahertz resonant acoustic fields (RAF). Suspended NIH 3T3 cells under RAF treatment agglomerated at acoustic nodal planes by primary radiation force within a short exposure time. These first arrived and agglomerated cells formed bands as nucleating sites for nanometer-sized ecotropic retroviruses circulated between nodal planes to attach on and thereby increased cell-virus encounters. According to the neomycin-resistant colony assay, 2-fold increment of retroviral transduction rate was obtained by exposing cells and retroviruses in the RAF for 6 min in the presence of 8 microg/mL Polybrene.
authors.affiliation: Department of Chemical Engineering, University of Southern California, Los Angeles, California 90089, USA.
authors.forename: Yu-Hsiang
authors.initials: YH
authors.lastname: Lee
authors.forename: Jin-Oh
authors.initials: JO
authors.lastname: You
authors.forename: Ching-An
authors.initials: CA
authors.lastname: Peng
mesh_terms: D016475:3T3 Cells; D000162:Acoustics; D000818:Animals; D002448:Cell Adhesion; D051379:Mice; D012190:Retroviridae / Q000235:genetics*; D014161:Transduction, Genetic