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BioCoat Matrigel invasion chambers (Becton Dickinson, Bedford, MA) were used to assess cell invasion. A549 cells (2 �� 104) were seeded into the upper chamber of the matrigel invasion chamber. The chemoattractants used were DMEM supplemented with 10% bovine serum albumin (BSA), or recombinant ADAM9-S protein, or the supernatants from cells previously exposed to H2O2 to evaluate the contribution of ADAM9-S. After 24 hr, cells were removed with a cotton swab. Invading cells located on the reverse side of the insert were fixed with 100% methanol, stained with 1% Toluidine blue and counted using light microscopy at magnification 40 in four representative fields. Human ADAM9 siRNA and control siRNA were purchased from Santa Cruz. Briefly, A549 cells were grown to 60�C80% confluence in DMEM supplemented with 10% FBS http://www.selleck.cn/products/pf-06463922.html and without antibiotics. 60 pmol of siRNA was diluted in 1 ml of transfection reagent and transfection medium (Santa Cruz). After 5 hr, DMEM containing 20% FBS and antibiotics was added to each plate. Cells were incubated over 18�C24 hr and further incubated with culture medium. Transfected cells were collected for assessing ADAM9 expression by Western blotting and performing invasion and adherence assays. All values are means of three independent experiments. Statistical comparisons were carried out using analysis of variance tests to compare means. p values http://www.selleckchem.com/products/3-deazaneplanocin-a-dznep.html significant. We first evaluated the influence of hydrogen peroxide on ADAM9 protein expression and ADAM metalloprotease activity. Short-term exposure to H2O2 (3 hr) induced dose-dependent expression of the 80 kDa ADAM9 protein (Fig. 1a). Western blot analysis using an anti-ADAM9 mAb also showed increased expression of a 68 kDa protein. Simultaneously, H2O2 induced ADAM metalloprotease activity in a dose-dependent manner (Fig. 1b). Cells exposed to 0.2 and 1 mM H2O2 induced respectively 2.72 and 4.22 fold increase in ADAM metalloprotease activity. Because the metalloprotease activity detected was not specific for ADAM9, western blot analyses of ADAM10 and ADAM17 expression were also performed on A549 cells exposed or not to H2O2. No variations in expression were observed (Fig. 1a2 and 1a3), supporting the hypothesis that H2O2 selectively induces ADAM9 metalloprotease activity. To test the http://www.selleckchem.com/products/erastin.html hypothesis that the 68 kDa protein could correspond to ADAM9-S, ADAM metalloprotease activity was measured in cell layers and in supernatants. H2O2 exposure did induce any change in ADAM metalloprotease activity in the cell layers (Fig. 2a1). In contrast (Fig. 2a2), the exposure of the cells to 1 and 5 mM H2O2 induced 2- and 3-fold increases in metalloprotease activity in supernatants, respectively. Immunoprecipitation carried out on concentrated supernatants with two different antibodies raised against ADAM9 ectodomain, confirmed the presence of ADAM9-S. As shown in Fig.