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Abstract Title:

Autophagy is associated with cucurbitacin D-induced apoptosis in human T cell leukemia cells.

Abstract Source:

Med Oncol. 2016 Apr ;33(4):30. Epub 2016 Feb 25. PMID: 26913856

Abstract Author(s):

Tsukasa Nakanishi, Yuan Song, Cuiying He, Duo Wang, Kentaro Morita, Junichi Tsukada, Tamotsu Kanazawa, Yasuhiro Yoshida

Article Affiliation:

Tsukasa Nakanishi

Abstract:

We previously reported that the inflammasome inhibitor cucurbitacin D (CuD) induces apoptosis in human leukemia cell lines. In the present study, we investigated the effects of co-treatment with an additional Bcl-xL inhibitor, Z36. Treatment with Z36 induced cell death in leukemia cell lines, with MT-4 cells exhibiting the lowest sensitivity to Z36. Co-treatment of cells with Z36 and CuD resulted in a greater degree of cell death for Hut78 and Jurkat cells than treatment with CuD alone. In contrast, co-treatment of MT-4 cells with Z36 and CuD had a suppressive effect on cell death. The autophagy inhibitor 3-methyladenine (3-MA) suppressed the growth of leukemia cell lines HuT78, Jurkat, MT-1, and MT-4. CuD-induced cell death was enhanced by 3-MA in Jurkat cells, but inhibited in MT-4 cells. Western blotting results revealed cleavage of poly(ADP ribose) polymerase (PARP), supporting CuD-induced cell death; 3-MA enhanced CuD-Z36-induced PARP cleavage. Taken together, our results indicate that autophagy negatively regulates chemical-induced cell death of leukemia cells, and that controlling autophagy could be beneficial in the development of more effective chemotherapies against leukemia.

Study Type : In Vitro Study

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