Figure 3From: α5β1 integrin induces the expression of noncartilaginous procollagen gene expression in articular chondrocytes cultured in monolayersα5β1 integrin is gradually activated in dedifferentiating chondrocytes, possibly by RRAS. (a) Chondrocytes were cultured in monolayers for 2 days (D2) or 7 days (D7), and cell attachment was evaluated at respective time points on noncoated plates (Non-coat) or plates coated with fibronectin or BSA. (b) Attachment to fibronectin-coated plates was evaluated using 7-day cultured chondrocytes after incubation with a function blocking anti-α5β1 integrin antibody (JBS5; 1 μg/ml) or control IgG (Control; 1 μg/ml). (c) Constitutively active (CA) or dominantly negative (DN) mutants of small GTPases were overexpressed in monolayer-cultured chondrocytes by adenoviral gene transfer, and adhesion to fibronectin-coated plates was evaluated. Results are mean ± standard error of the mean of four (a), (b) or five (c) independent experiments, each in duplicate. **P <0.01.Back to article page