(A) CAFs were transfected with si-SNAI1 or negative control and then the expression of Snail1 was assessed by immunoblotting analysis. (B, C) CAFs were transfected with si-SNAI1 or with negative control and, after 48 h, co-cultured with A549 and H1299 cells for an additional 48 h. Lung cancer cells motility was measured by wound-healing assay. (D–F) Migration and invasion of A549 and H1299 cells, treated as in (B), was analyzed. (G) The levels of E-cadherin and vimentin in A549 and H1299 cells, treated as in (B), were assessed by immunoblotting. (H, I) The mRNA expression levels of CDH1 and VIM in A549 and H1299 cells, treated as in (B), were assessed by qRT-PCR.