The procedure was carried out as previously described [20 (link), 26 (link)]. Briefly, 4 × 104 of each of serum-starved DU145 stable cells were suspended in 100 μl of serum-free medium, and then cell suspension was added into the pre-equilibrated upper chamber of CIM-plate. The lower chamber was filled with 160 μl of complete DMEM containing 10% FBS. The kinetic cell index of migration was recorded every 15 min for 24 h and then calculated by RTCA software v1.2 (Roche Applied Science).
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