The invasive potential was determined using a 48-well micro chemotaxis Boyden chamber (Neuro Probe, Cabin John, MD, USA). HepG2 and HCCLM3 cells were propagated in a Boyden chamber containing polycarbonate membrane (8-mm pore size) which has been coated with matrigel. Thereafter, the Boyden chamber assay was carried out as reported in our prior reports [59 (link),60 (link)]. The invading cells on the membranes were observed by a Nikon ECLIPSE Ts2 (Nikon corporation, Tokyo, Japan).
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