OE33 cells were transfected using Amaxa™ V cell line Nucleofector™ kit (Amaxa; Köln, Germany) with silencing RNA (siRNA) for MMP‐7 and scrambled controls (Sigma‐Aldrich) using nucleofection as previously described (Kumar et al. 2014). Control and MMP‐7 knockdown cells (106 cells per flask) were then taken and further incubated for 24 h in SF medium. Conditioned medium (CM) was collected, centrifuged and stored at −80°C for migration and invasion assays.
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