Figure 2. IRSp53 splicing does not affect podosome formation.
(A) Restoration of podosome formation by the expression of each IRSp53 splicing isoform. NIH-Src cells were transfected sequentially with the IRSp53 siRNA vector and the expression vectors, and were stained with rhodamine-phalloidin (red) to visualize actin filaments and with anti-IRSp53 (blue). Scale bar, 20 µm. (B) Percentage of cells with podosomes in (A). Data are means±SD from three independent experiments. Approximately 100 cells were counted in each determination. **P<0.01 (Student's t test). The C-terminal amino acid residues of the IRSp53 splicing variants are also indicated.