Abstract
The anti-tumor potential of arsenic trioxide (ATO) and recombinant mutant human TRAIL (rmhTRAIL) has been confirmed in various kinds of tumors. However, the effects and mechanism of the two drugs in combination in multiple myeloma (MM) have not been established. In this study, we evaluated the proliferation inhibition and apoptosis induction effects of ATO and rmhTRAIL as single agents and in combination on the MM cell lines RPMI8226 and U266. Then, we used high-performance liquid chromatography and mass spectrometry to find differentially expressed proteins before and after drug treatment and to analyze the mechanism underlying the effect of ATO and rmhTRAIL on MM cells. Results indicated that ATO and rmhTRAIL had synergistic or additive effects on proliferation inhibition and apoptosis induction in MM cells, and the mechanism underlying the two-drug combination might involve regulation of the expression of several proteins affected by ATO and rmhTRAIL. Our study provides evidence of a potential new combination treatment strategy for MM.
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