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Fig. 11. β5 knockdown inhibits PAI1 stimulation of matrix assembly. (A) Lysates from MG-63 cells transfected with either control siRNA or β5 siRNA were analyzed for β5 integrin and actin using western blotting. (B,C) MG-63 cells treated with either control or β5 siRNA were incubated with [125I]fibronectin for 6 hours in the presence of 20 nM PAI. Cells were extracted with 1% DOC, and [125I]fibronectin that had been incorporated into detergent-insoluble matrix was recovered by centrifugation and measured by
-scintillation. Experiments are representative of separate experiments performed in triplicate. Data are the mean ± s.e. of one experiment performed in triplicate. P<0.05 (n=3), t-test. All values were normalized to protein content. No significant difference in protein content was observed between control siRNA and β5 siRNA-treated cells.