Abstract
Melanoma differentiation-associated gene-7/interleukin-24 (mda-7/IL-24) is a novel candidate of tumor suppressor that can selectively induce apoptosis experimentally in a spectrum of human cancer cells including leukemia cells. However, a recent study suggests that mda-7/IL-24 promotes the survival of chronic lymphocytic leukemia B-cells. In this study, we showed that mda-7/IL-24 was constitutively expressed in leukemia cell lines and primary acute myeloid leukemia samples. Using a conditionally replicating adenovirus expressing mda-7/IL-24 (ZD55-IL-24), we showed that enforced expression of mda-7/IL-24 in leukemia cells induced autophagy, which was triggered by the upregulation of Beclin-1. Immunofluorescence and coimmunoprecipitation studies suggested that mda-7/IL-24 protein interacts with Beclin-1. Class III PI3K/Beclin-1 complex was shown involved in the mda-7/IL-24-induced autophagy. Moreover, autophagy inhibition by phosphatidylinositol 3-kinase inhibitor, wortmannin, resulted in a reduced Beclin-1 expression and autophagosome formation associated with significantly enhanced cell death. Importantly, the combination of ZD55-IL-24 with wortmannin elicited a strongly enhanced antileukemia efficacy in established leukemia xenografts. These results suggest that mda-7/IL-24-induced autophagy in leukemia cells may provide survival advantage and mda-7/IL-24 combined with agents that disrupt autophagy is a promising new strategy for the treatment of leukemia.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China grants 30470745 (W Qian); 30600257 (Y Tong, W Qian); the Key Social Development Project of Zhejiang Province grants 2004c23005 (W Qian); Chinese National ‘973’ Project Foundation grants 2003AA216031, 2002AA216021, and Natural Science Foundation of China grants 30120160823 (X Liu). We are grateful to Prof. PhD Tamotsu Yoshimori (Research Institute for Microbial Disease, Osaka University) for providing EGFP-LC3 plasmide), and L Wang for her help with electron microscope.
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Yang, C., Tong, Y., Ni, W. et al. Inhibition of autophagy induced by overexpression of mda-7/interleukin-24 strongly augments the antileukemia activity in vitro and in vivo. Cancer Gene Ther 17, 109–119 (2010). https://doi.org/10.1038/cgt.2009.57
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DOI: https://doi.org/10.1038/cgt.2009.57
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