title: Targeting Biofilm Associated Staphylococcus aureus Using Resazurin Based Drug-susceptibility Assay.
abstract: Most pathogenic bacteria are able to form biofilms during infection, but due to the difficulty of manipulating and assessing biofilms, the vast majority of laboratory work is conducted with planktonic cells. Here, we describe a peg plate biofilm assay as performed with Staphylococcus aureus. Bacterial biofilms are grown on pegs attached to a 96-well microtiter plate lid, washed through gentle submersion in buffer, and placed in a drug challenge plate. After subsequent incubation they are again washed and moved to a final recovery plate, in which the fluorescent dye resazurin serves as a viability indicator. This assay offers greatly increased ease-of-use, reliability, and reproducibility, as well as a wealth of data when conducted as a kinetic read. Moreover, this assay can be adapted to a medium-throughput drug screening approach by which an endpoint fluorescent readout is taken instead, offering a path for drug discovery efforts.
authors.affiliation: Department of Medicine, Division of Infectious Diseases, University of Alabama at Birmingham.
authors.forename: Alex G
authors.initials: AG
authors.lastname: Dalecki
authors.affiliation: Department of Medicine, Division of Infectious Diseases, University of Alabama at Birmingham.
authors.forename: Cameron L
authors.initials: CL
authors.lastname: Crawford
authors.affiliation: Department of Medicine, Division of Infectious Diseases, University of Alabama at Birmingham; fwolsche@uab.edu.
authors.forename: Frank
authors.initials: F
authors.lastname: Wolschendorf
mesh_terms: D018441:Biofilms / Q000187:drug effects; D001681:Biological Assay; D010078:Oxazines; D015203:Reproducibility of Results; D013203:Staphylococcal Infections / Q000382:microbiology / Q000628:therapy; D013211:Staphylococcus aureus; D014966:Xanthenes
chemical_list: D010078:Oxazines; D014966:Xanthenes; C005843:resazurin