Hippocampal and entorhinal cortex tissue
samples were homogenized in 10
volumes of RIPA lysis buffer (50 mM Tris, pH 7.5, 150 mM NaCl, 0.1 % sodium dodecyl sulfate and 0.5 % deoxycholate, and 1 % NP40) containing a cocktail of protease and phosphatase inhibitors (20 mg / ml each of pepstatin A, aprotinin, phosphoramidon, and leupeptin; 0.5 mM 4 -(2 - aminoethyl) benzenesulfonyl fluoride hydrochloride; 1 mM EGTA; 5 mM fenvalerate; and 5 mM cantharidin).