After treatment, cells were washed 3× with ice-cold Hank's Balanced Salt Solution (HBSS) and lysed with Radioimmunoprecipitation Assay buffer (RIPA) buffer containing protease inhibitors (Boston Bioproducts BP-421) Son et al., 2013 (link). The protein content of each sample was determined by Pierce BCA protein assay. Aliquots of cell lysate were resolved on 10% to 12% sodium dodecyl sulfate–polyacrylamide gels and subsequently transferred to a polyvinylidene difluoride membrane (Millipore). The membrane was incubated with the following primary antibodies: anti-KLK10 (BiossUSA bs-2531R, 1:1000), anti-GAPDH (Abcam ab23565, 1:2000), anti-β-actin (Sigma-Aldrich A5316, 1:2000), anti-VCAM1 (Abcam ab134047, 1:1000), anti-ICAM1 (Abcam ab53013, 1:1000), and anti-phospho-NFκB p65 S356 (Cell Signaling #3033, 1:1000) overnight at 4°C in 5% milk in TBST at the concentration recommended by the manufacturer, followed by secondary antibody addition for 1 hr at RT in 5% milk in TBST. Protein expression was detected by a chemiluminescence method (Son et al., 2013 (link)).
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