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Curcumin potentiates antitumor activity of L-asparaginase via inhibition of the AKT signaling pathway in acute lymphoblastic leukemia.
Leukemia & Lymphoma 2012 July
L-asparaginase (L-ASP) is a universal component of therapy for acute lymphoblastic leukemia (ALL). Curcumin is a naturally occurring yellow pigment that is derived from the rhizome of Curcuma longa. In this study, we evaluated the cytotoxicity of the combined treatment of L-ASP and curcumin in three ALL cell lines. Synergistic cytotoxicity was observed in all three cell lines following the combined treatment of curcumin and L-ASP. Our results revealed that curcumin significantly enhanced the antitumor effect of L-ASP in the three ALL cell lines compared to that for L-ASP alone ( p < 0.05). Curcumin and L-ASP co-treatments induced apoptosis, via activation and cleavage of caspase-8 and BID cleavage accompanied by release of cytochrome c and activation of caspase-9/3, compared to the group treated with only L-ASP and the control group. Furthermore, the combination of curcumin and L-ASP led to significant reductions in phosphorylated AKT and expression of AKT-regulated gene products (FoxO1, GSK3β, IKKα, NF-κB, XIAP) compared with the group treated with only L-ASP and the control group. Overall, our findings suggest that curcumin potentiates the antitumor effects of L-ASP in acute lymphoblastic leukemia by constitutively inhibiting AKT and AKT-regulated gene products.
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