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The objective of this study was to examine the potential of enhancing the antileukemic activity of arsenic trioxide (ATO) by combining it with a folk remedy, crude methanolic extract of  Mucuna macrocarpa  (CMEMM). Human leukemia cells HL-60, Jurkat, and Molt-3 were treated with various doses of ATO, CMEMM, and combinations thereof for 24 and 48 h. Results indicated that the combination of 2.5   μ  M ATO and 50   μ  g/mL CMEMM synergistically inhibited cell proliferation in HL-60 and Jurkat cell lines. Apoptosis triggered by ATO/CMEMM treatment was confirmed by accumulation of cells in the sub-G 1  phase in cell cycle analyses, characteristic apoptotic nuclear fragmentation, and increased percentage of annexin V-positive apoptotic cells. Such combination treatments also led to elevation of reactive oxygen species (ROS). The antioxidants  N -acetyl cysteine (NAC), butylated hydroxytoluene, and   α  -tocopherol prevented cells from ATO/CMEMM-induced apoptosis. The ATO/CMEMM-induced activation of caspase-3 and caspase-9 can be blocked by NAC. In summary, these results suggest that ATO/CMEMM combination treatment exerts synergistic apoptosis-inducing effects in human leukemic cells through a ROS-dependent mechanism and may provide a promising antileukemic approach in the future.

evidence-based complementary and alternative medicine

Synergistic Apoptosis-Inducing Antileukemic Effects of Arsenic Trioxide and<i>Mucuna macrocarpa</i>Stem Extract in Human Leukemic Cells via a Reactive Oxygen Species-Dependent Mechanism

Synergistic Apoptosis-Inducing Antileukemic Effects of Arsenic Trioxide andMucuna macrocarpaStem Extract in Human Leukemic Cells via a Reactive Oxygen Species-Dependent Mechanism