Description:
Human brain tumor lysate was prepared by homogenization in modified RIPA buffer (150
mM sodium chloride, 50 mM Tris-HCl, pH 7.4, 1 mM ethylenediaminetetraacetic acid, 1
mM phenylmethylsulfonyl fluoride, 1% Triton X-100, 1% sodium deoxycholic acid, 0.1%
sodium dodecylsulfate, 5 μg/ml of aprotinin, 5 μg/ml of leupeptin.
Tissue and cell debris was removed by centrifugation. Protein concentration was
determined with Bio-Rad protein assay. The product was boiled for 5 min in 1 x SDS
sample buffer (50 mM Tris-HCl pH 6.8, 12.5% glycerol, 1% sodium dodecylsulfate,
0.01% bromophenol blue) containing 5% β-mercaptoethanol.