A. Lt, Ectopic miR-31 expression downregulates ARID1A expression in the OECM1, HSC3, FaDu and NOK cell lines, but not in the SAS cell line. Middle and Rt, qRT-PCR analysis targeting miR-31 and ARID1A mRNA expression, respectively, in OECM1 and SAS cell. B. Lt, Similarity between miR-31 and the 3′UTR sequence of the ARID1A. Rt, Reporter assays. Lt, Assays of Wt and Mut reporters after treatment with miR-31 mimic or miR-31 inhibitor in OECM1 and 293T cells. C. Ectopic ARID1A expression in OECM1 and SAS cells. Upper, mRNA expression; Lower, protein expression. D. Phenotypic analysis of the OECM1 (Upper) and SAS (Lower) cells. Lt, proliferation; Middle, migration; Rt, invasion. E. Knockdown of ARID1A protein expression in OECM1 and SAS cells using the siARID1A oligonucleotide. Lt, protein expression; Middle, proliferation; Rt, migration. F. Establishment of OECM1, SAS and FaDu cell subclones with ARID1A knockdown. G. Phenotypic analysis of the OECM1 (Upper) and SAS (Lower) cell subclones. Lt to Rt, proliferation, migration, invasion and AIG. Numbers below the Western blot pictures are the normalized values.