Example 8
Cells were lysed by addition of RIPA buffer [50 mM Tris (pH 7.5), 150 mM NaCl, 1 mM EGTA, 1 mM EDTA, 0.1% SDS, 1% Triton X-100] and incubated on ice for 30 min with occasional vortexing. The lysate was centrifuged at 14,000×g for 15 min, the supernatant was collected, and protein was quantitated by Bradford assay. Protein (8 μg) in laemmli buffer was separated by SDS-PAGE and transferred to PVDF Immobilon-P membranes (Millipore, Billerica, Mass.). Membranes were probed with rabbit anti-HBV core (Austral Biologicals, San Ramon, Calif.) (1:500 dilution) and mouse anti-GAPDH (Santa Cruz Biotechnology) (1:5,000) antibodies, followed by anti-mouse and anti-rabbit HRP-conjugated secondary antibodies (Sigma-Aldrich). Bound antibodies were visualized by adding Luminata Forte Western HRP substrate (Millipore) to the membrane and imaged with a Fuji camera system.