The combination of nifuroxazide and depsipeptide results in enhanced cytotoxicity of MM cells. (A) INA6 cells were incubated with the indicated doses of nifuroxazide and depsipeptide for 72 hours. Viability was measured using an ATP-dependent bioluminescence assay. (B) INA6 cells were incubated with the indicated doses of nifuroxazide and depsipeptide for 48 hours, after which Western analysis was performed with the indicated antibodies.