siRNA for EphA2 was obtained from Santa Cruz (sc-29304; Santa Cruz Biotechnology, CA, USA). The target sequence was 5′-AATGACATGCCGATCTACATG-3′ (EphA2)43, and non-silencing siRNA sequence 5′-AATTCTCCGAACGTGTCACGT-3′ was used as negative control. AGS cells (5 × 105 cells/well) were transfected with siRNA at a final concentration of 20 to 100 nM using lipofectamine-2000 (Invitrogen). Following 8 h of transfection, cells were replaced with fresh medium containing 10% serum. Forty-eight hours after siRNA transfection, suppression of EphA2 expression was confirmed by western blot.
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