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Fig. 1. IQGAP1 is required for FGF2-stimulated migration of MDBK cells. (A) MDBK cells were transfected with IQGAP1-specific siRNA or scrambled RNA (scrRNA) using a Nucleofector. To allow direct visual comparison of IQGAP1 levels in the two samples by western blotting, a concentration series of each cell extract was analyzed at the indicated relative dilutions. Note that siRNA reduced the IQGAP1 level to
20% of normal, but had no effect on cellular actin content. (B) Confluent monolayers were then serum-starved for 8 hours, wounded with a micropipette tip, and 2 hours later were stimulated with 25 ng/ml FGF2. Note that movement of IQGAP1-depleted cells into the wound, as seen after 7 hours of FGF2 exposure, was severely impaired, and that broad wounds persisted for more than 24 hours after wounding in both scrRNA-treated and IQGAP1-depleted cells that were not stimulated with FGF2.