The efficiency of siFAP was assessed by measuring the expression levels of FAP using flow cytometry. LX-2 cells were cultured in DMEM supplemented with 10% FBS, 100 units/mL of penicillin, and 100 μg/mL of streptomycin. LX-2 cells (4 × 105 cells/well) were seeded to a six-well plate (SPL Life Sciences), incubated for 24 h, and transfected for 20 min with 50 nM siFAP (Bioneer Corporation, Daejeon, Republic of Korea) complexed with 5 μL of Lipofectamine 2000. The sequences of siFAP were 5′-CUC UAU GCA GUG UAU CGA AdTdT-3′ (sense) and 5′-UUC GAU ACA CUG CAU AGA gdTdT-3′ (antisense). In some experiments, scrambled-sequence siRNA (siSCR) was used as a control. After transfection, cells were incubated for an additional 48 h. Next, cells were stained with a rabbit anti-FAP primary IgG antibody (1:50, Abcam) for 1 h, followed by an allophycocyanin (APC)-conjugated goat anti-rabbit IgG antibody (1:100, Abcam). After staining, cells were analyzed via BD LSR Fortessa (BD Bioscience) and Leica TCS8 confocal microscope (Leica, Bensheim, Germany). Flow cytometry data were acquired with BD FACSDIVA™ (v8.0.1., BD Bioscience). LEICA Application Suite X (v3.6.0., Leica) was used to collect confocal images. Control cells were stained with rabbit IgG isotype antibody (1:50, Abcam) followed by an APC-conjugated goat anti-rabbit IgG antibody (1:100, Abcam).
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