Human Lung Tissue Lysate was prepared by homogenization in a modified RIPA buffer (150 mM Sodium Chloride, 50 mM Tris-HCl, pH 7.4, 1 mM EDTA, 1 mM PMSF, 1% Triton X-100, 1% Sodium Deoxycholic Acid, 0.1% SDS, 5 μg/mL Aprotinin, 5 μg/mL Leupeptin.) Tissue and cell debris were removed by centrifugation. Protein concentration was determined with Bio-Rad protein assay.
The tissue lysate was boiled for 5 min in 1 x SDS sample buffer (50 mM Tris-HCl, pH 6.8, 12.5% Glycerol, 1% SDS, 0.01% Bromophenol Blue) containing 50 mM DTT.