Arsenic Trioxide and Resveratrol Show Synergistic Anti-Leukemia Activity and Neutralized Cardiotoxicity

Cardiotoxicity is an aggravating side effect of many clinical antineoplastic agents such as arsenic trioxide (As 2 O 3 ), which is the first-line treatment for acute promyelocytic leukemia (APL). Clinically, drug combination strategies are widely applied for complex disease management. Here, an optimized, cardiac-friendly therapeutic strategy for APL was investigated using a combination of As 2 O 3 and genistein or resveratrol. Potential combinations were explored with respect to their effects on mitochondrial membrane potential, reactive oxygen species, superoxide dismutase activity, autophagy, and apoptosis in both NB4 cells and neonatal rat left ventricular myocytes. All experiments consistently suggested that 5 µM resveratrol remarkably alleviates As 2 O 3 -induced cardiotoxicity. To achieve an equivalent effect, a 10-fold dosage of genistein was required, thus highlighting the dose advantage of resveratrol, as poor bioavailability is a common concern for its clinical application. Co-administration of resveratrol substantially amplified the anticancer effect of As 2 O 3 in NB4 cells. Furthermore, resveratrol exacerbated oxidative stress, mitochondrial damage, and apoptosis, thereby reflecting its full range of synergism with As 2 O 3 . Addition of 5 µM resveratrol to the single drug formula of As 2 O 3 also further increased the expression of LC3, a marker of cellular autophagy activity, indicating an involvement of autophagy-mediated tumor cell death in the synergistic action. Our results suggest a possible application of an As 2 O 3 and resveratrol combination to treat APL in order to achieve superior therapeutics effects and prevent cardiotoxicity.