Inhibition of Akt enhances sorafenib-induced growth inhibition and apoptosis.

<p>A-B, HepG2 and Huh7 cells were exposed to 100 nM bufalin and/or 5 μM of sorafenib in the presence or absence of perifosine (10 μM) for 48 h. (A) Cell viability (%) was then compared with the corresponding untreated cells. (B) The percentages of apoptotic cells (%) were measured by flow cytometry. Untransfected cells served as controls. C-D, HepG2 and Huh7 cells were transfected with control or Akt siRNA for 24 h and then incubated with 100 nM bufalin, 5 μM sorafenib, or a combination of the two drugs for 24 h. (C) Cell viability (%) was compared with control siRNA-transfected cells. (D) The percentages of apoptotic cells (%) were measured by flow cytometry. Untransfected cells served as controls. The data represent three independent experiments. “**” represents P<0.001.