Interaction between fibrillar BSA and integrin α5β1. (A) T47D cell lines were pre-treated with or without 0.67 μM goat IgG or 0.67 μM goat anti-integrin α5β1 antibody for 30 min as indicated, then incubated with 2 μM F-BSA (BSA-S200) in serum-free medium for 8 h. Cell viability was determined by the MTT assay. Data are means ± S.D. (n = 3). (B) Integrin α5β1 protein was linked to protein A/G beads by use of anti-integrin α5β1 antibody, then incubated with F-BSA (BSA-S200) or G-BSA (BSA) overnight. The immunocomplexes were separated by SDS-PAGE and immunoblotted with anti-integrin α5 and anti-BSA antibodies.