DU145 cell line was obtained from the American Tissue Type Collection (ATCC, Manassas, VA). The cell line was cultured in Iscove’s modified Dulbecco’s medium (IMDM) from Mediatech (Manassas,VA) supplemented with 10% fetal bovine serum (FBS) Hyclone Laboratories (Novato, CA) and incubated at 37° in a 5% CO2 humidified chamber. Non-enzymatic Cellstripper (CelGro, Manassas, VA) was used for cell harvesting. Antibodies used for immunofluorescence microscopy include: anti-α6 integrin (A6NT, (21 (link))), anti-Desmin (Atlas Antibodies HPA018803), anti-E-Cadherin M168 (Abcam ab76055), anti-CK5/14 (KA2), anti-CK18 (Abcam EPR1626), and anti-FOXA1 (Abcam EPR10881). Antibodies used for flow cytometry include: anti-α6 integrin phycoerythrin (PE) conjugated GoH3 (eBioscience, San Diego, CA) and ADG3937 (Sekisui Diagnostics) mouse monoclonal antibody against uPAR. Alexa Fluor 488 (Invitrogen) secondary antibody was used for uPAR detection.